Datasheet 71M6534H Datasheet (TERIDIAN Semiconductor)

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71M6534H Demo Board

USER’S MANUAL

5/28/2008 1:33:00 PM

V2-0

TERIDIAN Semiconductor Corporation

6440 Oak Canyon Rd., Suite 100

Irvine, CA 92618-5201

Phone: (714) 508-8800 ▪ Fax: (714) 508-8878

http://www.teridian.com/

meter.support@teridian.com

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71M6534H Demo Board User’s Manual

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71M6534H Demo Board User’s Manual

TERIDIAN Semiconductor Corporation makes no warranty for the use of its products, other than expressly contained in the Company’s warranty detailed in the TERIDIAN Semiconductor Corporation standard Terms and Conditions. The company assumes no responsibility for any errors which may appear in this document, reserves the right to change devices or specifications detailed herein at any time without notice and does not make any commitment to update the information contained herein.

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71M6534H Demo Board User’s Manual

71M6534H

3-Phase Energy Meter IC

DEMO BOARD

USER’S MANUAL

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71M6534H Demo Board User’s Manual

Table of Contents

1 GETTING STARTED................................................................................................................................................ 9

1.1 General .................................................................................................................................................................... 9

1.2 Safety and ESD Precautions ................................................................................................................................. 9

1.3 Demo Kit Contents ................................................................................................................................................. 9

1.4 Demo Board Versions .......................................................................................................................................... 10

1.5 Compatibility ......................................................................................................................................................... 10

1.6 Suggested Equipment not Included ................................................................................................................... 10

1.7 Demo Board Test Setup ....................................................................................................................................... 10

1.7.1 Power Supply Setup ........................................................................................................................................ 13

1.7.2 Cable for Serial Connection (Debug Board) .................................................................................................... 13

1.7.3 Checking Operation ......................................................................................................................................... 14

1.7.4 Serial Connection Setup .................................................................................................................................. 15

1.8 Using the Demo Board ......................................................................................................................................... 16

1.8.1 Serial Command Language ............................................................................................................................. 17

1.8.2 Using the Demo Board for Energy Measurements .......................................................................................... 25

1.8.3 Adjusting the Kh Factor for the Demo Board ................................................................................................... 25

1.8.4 Adjusting the Demo Boards to Different Current Transformers ....................................................................... 26

1.8.5 Adjusting the Demo Boards to Different Voltage Dividers ............................................................................... 26

1.9 Calibration Parameters ........................................................................................................................................ 27

1.9.1 General Calibration Procedure ........................................................................................................................ 27

1.9.2 Calibration Macro File ..................................................................................................................................... 28

1.9.3 Updating the 6534_demo.hex file .................................................................................................................... 28

1.9.4 Updating Calibration Data in Flash Memory without Using the ICE or a Programmer .................................... 28

1.9.5 Automatic Calibration (Auto-Cal) ..................................................................................................................... 29

1.9.6 Loading the 6534_demo.hex file into the Demo Board.................................................................................... 29

1.9.7 The Programming Interface of the 71M6534/6534H ....................................................................................... 31

1.10 Demo Code ........................................................................................................................................................ 32

1.10.1 Demo Code Description ............................................................................................................................... 32

1.10.2 Important Demo Code MPU Parameters ..................................................................................................... 33

1.10.3 Useful CLI Commands Involving the MPU and CE ...................................................................................... 39

1.11 Using the ICE (In-Circuit Emulator) ................................................................................................................. 39

2 APPLICATION INFORMATION ............................................................................................................................. 41

2.1 Calibration Theory ................................................................................................................................................ 41

2.1.1 Calibration with Three Measurements ............................................................................................................. 41

2.1.2 Calibration with Five Measurements ............................................................................................................... 43

2.1.3 Fast Calibration ............................................................................................................................................... 44

2.2 Calibration Procedures ........................................................................................................................................ 45

2.2.1 Calibration Procedure with Three Measurements ........................................................................................... 46

2.2.2 Calibration Procedure with Five Measurements .............................................................................................. 47

2.2.3 Fast Calibration – Auto-Calibration.................................................................................................................. 47

2.2.4 Calibration Procedure for Rogowski Coil Sensors ........................................................................................... 48

2.2.5 Calibration Spreadsheets ................................................................................................................................ 49

2.2.6 Compensating for Non-Linearities ................................................................................................................... 52

2.3 Calibrating and Compensating the RTC ............................................................................................................. 53

2.4 Schematic Information ......................................................................................................................................... 54

2.4.1 Components for the V1 Pin ............................................................................................................................. 54

2.4.2 Reset Circuit .................................................................................................................................................... 54

2.4.3 Oscillator ......................................................................................................................................................... 55

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71M6534H Demo Board User’s Manual

2.4.4

EEPROM ......................................................................................................................................................... 55

2.4.5 LCD ................................................................................................................................................................. 56

2.4.6 Optical Interface .............................................................................................................................................. 56

2.5 Testing the Demo Board ...................................................................................................................................... 57

2.5.1 Functional Meter Test ...................................................................................................................................... 57

2.5.2 EEPROM ......................................................................................................................................................... 58

2.5.3 RTC ................................................................................................................................................................. 59

2.5.4 Hardware Watchdog Timer (WDT) .................................................................................................................. 59

2.5.5 LCD ................................................................................................................................................................. 59

2.6 TERIDIAN Application Notes ............................................................................................................................... 60

3 HARDWARE DESCRIPTION ................................................................................................................................. 61

3.1 D6534T14A2 Board Description: Jumpers, Switches and Test Points ............................................................ 61

3.2 Board Hardware Specifications .......................................................................................................................... 64

4 APPENDIX ............................................................................................................................................................. 65

4.1 D6534T14A2 Schematics, PCB Layout and BOM .............................................................................................. 66

4.2 Debug Board Description .................................................................................................................................... 76

4.3 71M6534H IC Description ..................................................................................................................................... 81

4.4 Formulae for Fast Calibration ............................................................................................................................. 84

List of Figures

Figure 1-1: TERIDIAN D6534T14A2 Demo Board with Debug Board: Basic Connections ............................................... 11

Figure 1-2: Block diagram for the TERIDIAN D6534T14A2 Demo Board with Debug Board ............................................ 12

Figure 1-3: Hyperterminal Sample Window with Disconnect Button (Arrow) ..................................................................... 15

Figure 1-4: Port Speed and Handshake Setup (left) and Port Bit setup (right) .................................................................. 16

Figure 1-5: Command Line Help Display .......................................................................................................................... 17

Figure 1-6: Typical Calibration Macro File ......................................................................................................................... 28

Figure 1-7: Emulator Window Showing Reset and Erase Buttons (see Arrows) ............................................................... 30

Figure 1-8: Emulator Window Showing Erased Flash Memory and File Load Menu ......................................................... 30

Figure 2-1: Watt Meter with Gain and Phase Errors. ......................................................................................................... 41

Figure 2-2: Phase Angle Definitions .................................................................................................................................. 45

Figure 2-3: Calibration Spreadsheet for Three Measurements ......................................................................................... 50

Figure 2-4: Calibration Spreadsheet for Five Measurements ............................................................................................ 50

Figure 2-5: Calibration Spreadsheet for Rogowski coil ..................................................................................................... 51

Figure 2-6: Non-Linearity Caused by Quantification Noise ............................................................................................... 52

Figure 2-7: Voltage Divider for V1 ..................................................................................................................................... 54

Figure 2-8: External Components for RESET ................................................................................................................... 54

Figure 2-9: Oscillator Circuit .............................................................................................................................................. 55

Figure 2-10: EEPROM Circuit ........................................................................................................................................... 55

Figure 2-11: LCD Connections .......................................................................................................................................... 56

Figure 2-12: Optical Interface Block Diagram ................................................................................................................... 56

Figure 2-13: Meter with Calibration System ...................................................................................................................... 57

Figure 2-14: Calibration System Screen ........................................................................................................................... 58

Figure 3-1: D6534T14A2 Demo Board - Board Description (Default jumper settings indicated in yellow) ........................ 63

Figure 4-1: TERIDIAN D6534T14A2 Demo Board: Electrical Schematic 1/3 .................................................................... 66

Figure 4-2: TERIDIAN D6534T14A2 Demo Board: Electrical Schematic 2/3 .................................................................... 67

Figure 4-3: TERIDIAN D6534T14A2 Demo Board: Electrical Schematic 3/3 .................................................................... 68

Figure 4-4: TERIDIAN D6534T14A2 Demo Board: Top View ........................................................................................... 70

Figure 4-5: TERIDIAN D6534T14A2 Demo Board: Bottom View ...................................................................................... 71

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71M6534H Demo Board User’s Manual

Figure 4-6: TERIDIAN D6534T14A2 Demo Board: Top Signal Layer ............................................................................... 72

Figure 4-7: TERIDIAN D6534T14A2 Demo Board: Bottom Signal Layer .......................................................................... 75

Figure 4-8: TERIDIAN D6534T14A2 Demo Board: Ground Layer .................................................................................... 73

Figure 4-9: TERIDIAN D6534T14A2 Demo Board: V3P3 Layer ....................................................................................... 74

Figure 4-10: Debug Board: Electrical Schematic............................................................................................................... 77

Figure 4-11: Debug Board: Top View ................................................................................................................................ 78

Figure 4-12: Debug Board: Bottom View ........................................................................................................................... 78

Figure 4-13: Debug Board: Top Signal Layer .................................................................................................................... 79

Figure 4-14: Debug Board: Middle Layer 1 (Ground Plane) .............................................................................................. 79

Figure 4-15: Debug Board: Middle Layer 2 (Supply Plane) ............................................................................................... 80

Figure 4-16: Debug Board: Bottom Trace Layer ............................................................................................................... 80

Figure 4-17: TERIDIAN 71M6534H epLQFP100: Pinout (top view) .................................................................................. 83

List of Tables

Table 1-1: Jumper settings on Debug Board ..................................................................................................................... 13

Table 1-2: Straight cable connections ............................................................................................................................... 13

Table 1-3: Null-modem cable connections ........................................................................................................................ 13

Table 1-4: Selectable Display Parameters ........................................................................................................................ 14

Table 1-5: CE RAM Locations for Calibration Constants .................................................................................................. 27

Table 1-6: Flash Programming Interface Signals .............................................................................................................. 31

Table 1-7: MPU Input Parameters for Metering ................................................................................................................ 34

Table 1-8: Selectable Pulse Sources ................................................................................................................................ 35

Table 1-9: MPU Instantaneous Output Variables .............................................................................................................. 36

Table 1-10: MPU Status Word Bit Assignment.................................................................................................................. 37

Table 1-11: MPU Accumulation Output Variables ............................................................................................................. 38

Table 1-12: CLI Commands for MPU Data Memory .......................................................................................................... 39

Table 3-1: D6534T14A2 Demo Board Description ............................................................................................................ 61

Table 4-1: D6534T14A2 Demo Board: Bill of Material ...................................................................................................... 69

Table 4-2: Debug Board: Bill of Material ........................................................................................................................... 76

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71M6534H Demo Board User’s Manual

1 GETTING STARTED

1.1 GENERAL

The TERIDIAN Semiconductor Corporation (TSC) 71M6534H Demo Board is a demonstration board for evaluating the 71M6534H device for 3-phase electronic power metering applications. It incorporates a 71M6534 or 71M6534H integrated circuit, peripheral circuitry such as a serial EEPROM, emulator port, and on board power supply as well as a companion Debug Board that allows a connection to a PC through a RS232 port. The demo board allows the evaluation of the 71M6534 or 71M6534H energy meter chip for measurement accuracy and overall system use.

The board is pre-programmed with a Demo Program in the FLASH memory of the 71M6534/6534H IC. This embedded application is developed to exercise all low-level function calls to directly manage the peripherals, flash programming, and CPU (clock, timing, power savings, etc.).

The 71M6534/6534H IC on the Demo Board is pre-programmed with default calibration factors.

1.2 SAFETY AND ESD PRECAUTIONS

Connecting live voltages to the demo board system will result in potentially hazardous voltages on the demo board.

THE DEMO SYSTEM IS ESD SENSITIVE! ESD PRECAUTIONS SHOULD BE TAKEN WHEN HANDLING THE DEMO BOARD!

EXTREME CAUTION SHOULD BE TAKEN WHEN HANDLING THE DEMO BOARD ONCE IT IS CONNECTED TO LIVE VOLTAGES!

1.3 DEMO KIT CONTENTS

• Demo Board D6534T14A2 with 71M6534H IC and pre-loaded demo program:

• Debug Board

• Two 5VDC/1,000mA universal wall transformers with 2.5mm plug (Switchcraft 712A compatible)

• Serial cable, DB9, Male/Female, 2m length (Digi-Key AE1020-ND)

• CD-ROM containing documentation (data sheet, board schematics, BOM, layout), Demo Code (sources

and executable), and utilities

The CD-ROM contains a file named readme.txt that describes all files found on the CD-ROM.

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1.4 DEMO BOARD VERSIONS

At printing time of this document only the following version of the Demo Board is available:

• Demo Board D6534T14A2 (standard)

1.5 COMPATIBILITY

This manual applies to the following hardware and software revisions:

• 71M6534 or 71M6534H chip revision A03

• Demo Kit firmware revision 4p6q

• Demo Boards D6534T14A2

1.6 SUGGESTED EQUIPMENT NOT INCLUDED

For functional demonstration:

• PC w/ MS-Windows For software development (MPU code):

• Signum ICE (In Circuit Emulator): ADM-51 – see update information in section 1.11

http://www.signum.com

versions XP, ME, or 2000, equipped with RS232 port (COM port) via DB9 connector

• Keil 8051 “C” Compiler kit: CA51

http://www.keil.com/c51/ca51kit.htm

, http://www.keil.com/product/sales.htm

1.7 DEMO BOARD TEST SETUP

Figure 1-1 shows the basic connections of the Demo Board plus Debug Board with the external equipment for desktop testing, i.e. without live power applied. For desktop testing, both the Demo and Debug board may be powered with their 5VDC power supplies.

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71M6534H Demo Board User’s Manual

Power (5VDC)

Demo Board

Two Power Supplies

(100VAC to 240VAC,

5V/1ADC Output)

Debug

Power 5VDC

Board

Host PC

Figure 1-1: TERIDIAN D6534T14A2 Demo Board with Debug Board: Basic Connections

The D6534T14A2 Demo Board block diagram is shown in Figure 1-2. It consists of a stand-alone meter Demo Board and an optional Debug Board. The Demo Board contains all circuits necessary for operation as a meter, including display, calibration LED, and internal power supply. The Debug Board provides magnetic isolation from the meter and interfaces to a PC through a 9 pin serial port. For serial communication between the PC and the TERIDIAN 71M6534H, the Debug Board needs to be plugged with its connector J3 into connector J2 of the Demo Board.

Connections to the external signals to be measured, i.e. AC voltages and current signals derived from shunt resistors or current transformers, are provided on the rear side of the demo board (see Figure 3-1).

Caution: It is recommended to set up the demo board with no live AC voltage connected, and to connect live AC voltages only after the user is familiar with the demo system.

All input signals are referenced to the V3P3 (3.3V power supply to the chip).

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DEMONSTRATION METER

External Current

Transformers

INEUTRAL

VC VB

JP1

NEUTRAL

V3P3

5V DC

battery

(optional)

On-board

components

V3P3D

3.3v

JP8

GND

IDP

IDN

IAP IAN

IBP

IBN ICP

ICN

V3P3A

V3P3SYS

6534H

Single Chip

Meter

VB VC

GND

VBAT

V3P3D

DIO6/WPULSE

DIO8/XPULSE DIO7/RPULSE

DIO9/YPULSE

DIO4 DIO5

DIO56

DIO57

DIO58

TMUXOUT

CKTEST

PULSE OUTPUTS

GND

VARh

EEPROM

ICE Connector

5, 7, 9, 11

15, 16

N/C

13, 14

N/C

V3P3SYS

3.3V LCD

DEBUG BOARD (OPTIONAL)

OPTO

V5_DBG

MPU HEARTBEAT (5Hz)

V5_DBG

CE HEARTBEAT (1Hz)

V5_DBG

GND_DBG

V5_DBG

RS-232

INTERFACE

OPTO

5V DC

GND_DBG

JP21

DB9 to PC COM Port

RTM INTERFACE

FPGA

68 Pin Connector to NI PCI-6534

DIO Board

V5_NI

05/23/2008

Figure 1-2: Block diagram for the TERIDIAN D6534T14A2 Demo Board with Debug Board

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71M6534H Demo Board User’s Manual

1.7.1 POWER SUPPLY SETUP

There are several choices for meter power supply:

• Internal (using phase A of the AC line voltage). The internal power supply is only suitable when phase A

exceeds 220V RMS.

• External 5VDC connector (J1) on the Demo Board

• External 5VDC connector (J1) on the Debug Board.

The power supply jumper JP1 must be consistent with the power supply choice. JP1 connects the AC line voltage to the internal power supply. This jumper should usually be left in place.

1.7.2 CABLE FOR SERIAL CONNECTION (DEBUG BOARD)

For connection of the DB9 serial port to a PC, either a straight or a so-called “null-modem” cable may be used. JP1 and JP2 are plugged in for the straight cable, and JP3/JP4 are empty. The jumper configuration is reversed for the null-modem cable, as shown in Table 1-1.

Cable

Configuration

Straight Cable

Null-Modem Cable Alternative -- -- Installed Installed

JP1 through JP4 can also be used to alter the connection when the PC is not configured as a DCE device. Table 1-2 shows the connections necessary for the straight DB9 cable and the pin definitions.

Table 1-3 shows the connections necessary for the null-modem DB9 cable and the pin definitions.

Mode

Default

Table 1-1: Jumper settings on Debug Board

PC Pin Function Demo Board Pin

2 TX 2

3 RX 3

5 Signal Ground 5

Table 1-2: Straight cable connections

PC Pin Function Demo Board Pin

2 TX 3

3 RX 2

5 Signal Ground 5

Table 1-3: Null-modem cable connections

JP1 JP2 JP3 JP4

Installed Installed -- --

Jumpers on Debug Board

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1.7.3 CHECKING OPERATION

A few seconds after power up, the LCD display on the Demo Board should display this brief greeting:

H E L L 0

The “HELLO” message should be followed by the display of accumulated energy alternating with the text “Wh”.

3. 0. 0 0 1

W h

If the PB switch on the Demo Board is pressed and held down), the display will cycle through a series of parameters, as shown in Table 1-4.

Step

Displayed

Text

DELTA C

VARh

VAh

HOURS

TIME

Once, the Debug Board is plugged into J2 of the Demo Board, LED DIO1 on the Debug Board will flash with a frequency of 1Hz, indicating CE activity. The LED DIO0 will flash with a frequency of 5Hz, indicating MPU activity.

Deviation from nominal temperature [°C]

Line frequency [Hz] 11

Accumulated real energy [Wh]

Exported real energy [Wh] 13

Accumulated reactive energy [VARh]

Exported reactive energy [VARh]

Accumulated apparent energy [VARh]

Hours of operation since last reset [1/100 h]

Real time from RTC [hh.mm.ss]

Description Step

Table 1-4: Selectable Display Parameters

Displayed

Text

DATE

EDGES

PULSES

VBAT

Description

Date from RTC [yyyy.mm.dd]

Power factor, calculated from current Wh/VAh

Accumulated pulses

Current

Voltage

Battery voltage

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71M6534H Demo Board User’s Manual

1.7.4 SERIAL CONNECTION SETUP

After connecting the DB9 serial port to a PC, start the HyperTerminal application and create a session using the following parameters:

Port Speed: 9600 bd or 300bd, depending on jumper JP16 (see section 3.1) Data Bits: 8 Parity: None Stop Bits: 1 Flow Control: XON/XOFF

HyperTerminal can be found by selecting Programs ÆAccessories Æ Communications from the Windows© start menu. The connection parameters are configured by selecting File Æ Properties and then by pressing the Configure button. Port speed and flow control are configured under the General tab (Figure 1-4, left), bit settings are configured by pressing the Configure button (Figure 1-5, right), as shown below. A setup file (file name “Demo Board Connection.ht”) for HyperTerminal that can be loaded with File Æ Open is also provided with the tools and utilities.

Port parameters can only be adjusted when the co nnection is not active. The disconnect

button, as shown in Figure 1-3 must be clicked in order to disconnect the port.

Figure 1-3: Hyperterminal Sample Window with Disconnect Butto n (Arrow)

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71M6534H Demo Board User’s Manual

Figure 1-4: Port Speed and Handshake Setup (left) and Port Bit setup (right)

Once, the connection to the demo board is established, press <CR> and the prompt, >, should appear. Type >? to see the Demo Code help menu. Type >i to verify the Demo Code revision.

1.8 USING THE DEMO BOARD

The 71M6534/6534H Demo Board is a ready-to-use meter prepared for use with external current transformers.

Using the Demo Board involves communicating with the Demo Code via the command line interface (CLI). The CLI allows modifications to the metering parameters, access to the EEPROM, initiation of auto-cal sequences, selection of the displayed parameters, changing of calibration factors and more operations that can be used to evaluate the 71M6534 chip.

Before evaluating the 71M6534/6534H on the Demo Board, users should get familiar with the commands and responses of the CLI. A complete description of the CLI is provided in section 1.8.1.

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1.8.1 SERIAL COMMAND LANGUAGE

The Demo Code residing in the flash memory of the 71M6534/6534H provides a convenient way of examining and modifying key meter parameters. Once the Demo Board is connected to a PC or terminal per the instructions given in Section 1.7.2 and 1.7.4, typing ‘?’ will bring up the list of commands shown in Figure 1-5.

Figure 1-5: Command Line Help Display

The tables in this chapter describe the commands in detail.

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71M6534H Demo Board User’s Manual

Commands to Display Help on the CLI Commands:

? HELP

Description: Command help available for each of the options below.

Command

combinations:

?] Display help on access CE data RAM

?) Display help on access MPU RAM

?, Display help on repeat last command

?/ Display help on ignore rest of line

?C Display help on compute engine control.

?CL Display help on calibration.

?EE Display help on EEPROM control

?ER Display help on error recording

?I Display help on information message

?M Display help on meter display control

?MR Display help on meter RMS display control

?R Display help on SFR control

?RT Display help on RTC control

?T Display help on trim control

?W Display help on the wait/reset command

?Z Display help on reset

Examples: ?? Display the command line interpreter help menu.

?C Displays compute engine control help.

Commands for CE Data Access:

? Command line interpreter help menu.

Comment

] CE DATA ACCESS Comment

Description: Allows user to read from and write to CE data space.

Usage: ] [Starting CE Data Address] [option]…[option]

Command

combinations:

]A$$$

]A=n=n

]U Update default version of CE Data in flash memory

Example: ]40$$$ Reads CE data words 0x40, 0x41 and 0x42.

]7E=12345678=9876ABCD Writes two words starting @ 0x7E

All CE data words are in 4-byte (32-bit) format. Typing ]A? will access the 32-bit word located at the byte address 0x1000 + 4 * A = 0x1028.

]A???

Read consecutive 16-bit words in Decimal, starting at address A

Read consecutive 16-bit words in Hex, starting at address A

Write consecutive memory values, starting at address A

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71M6534H Demo Board User’s Manual

Commands for MPU/XDATA Access:

) MPU DATA ACCESS Comment

Description: Allows user to read from and write to MPU data space.

Usage: ) [Starting MPU Data Address] [option]…[option]

Command

)A???

combinations:

)A$$$

Read three consecutive 32-bit words in Decimal, starting at address A

Read three consecutive 32-bit words in Hex, starting at address A

)A=n=m

Write the values n and m to two consecutive addresses starting at address A

?) Display useful RAM addresses.

Example: )08$$$$ Reads data words 0x08, 0x0C, 0x10, 0x14

)04=12345678=9876ABCD Writes two words starting @ 0x04

MPU or XDATA space is the address range for the MPU XRAM (0x0000 to 0xFFF). All MPU data words are in 4-byte (32-bit) format. Typing ]A? will access the 32-bit word located at the byte address 4 * A = 0x28. The energy accumulation registers of the Demo Code can be accessed by typing two Dollar signs (“$$”), typing question marks will display negative decimal values if the most significant bit is set.

Commands for DIO RAM (Configuration RAM) and SFR Control:

R DIO AND SFR CONTROL Comment

Description: Allows the user to read from and write to DIO RAM and special function registers (SFRs).

Usage: R [option] [register] … [option]

Command

combinations:

RIx…

Select I/O RAM location x (0x2000 offset is automatically added)

Rx… Select internal SFR at address x

Ra???...

Read consecutive SFR registers in Decimal, starting at address a

Ra$$$...

Read consecutive registers in Hex, starting at address a

Ra=n=m…

Set values of consecutive registers to n and m starting at address a

Example: RI2$$$ Read DIO RAM registers 2, 3, and 4 in Hex.

DIO or Configuration RAM space is the address range 0x2000 to 0x20FF. This RAM contains registers used for configuring basic hardware and functional properties of the 71M6534/6534H and is organized in bytes (8 bits). The 0x2000 offset is automatically added when the command RI is typed.

The SFRs (special function registers) are located in internal RAM of the 80515 core, starting at address 0x80.

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71M6534H Demo Board User’s Manual

Commands for EEPROM Control:

EE EEPROM CONTROL Comment

Description: Allows user to enable read and write to EEPROM.

Usage: EE [option] [arguments]

Command

combinations:

EERa.b Read EEPROM at address 'a' for 'b' bytes.

EESabc..xyz Write characters to buffer (sets Write length)

EETa Transmit buffer to EEPROM at address 'a'.

EEWa.b...z Write values to buffer

CLS Saves calibration to EEPROM

Example:

Due to buffer size restrictions, the maximum number of bytes handled by the EEPROM command is 0x40.

EECn EEPROM Access (1 Æ Enable, 0 Æ Disable)

EEShello

EET$0210

Writes 'hello' to buffer, then transmits buffer to

EEPROM starting at address 0x210.

Auxiliary Commands:

Typing a comma (“,”) repeats the command issued from the previous command line. This is very helpful when examining the value at a certain address over time, such as the CE DRAM address for the temperature (0x40).

The slash (“/”) is useful to separate comments from commands when sending macro text files via the serial interface. All characters in a line after the slash are ignored.

Commands controlling the CE, TMUX and the RTM:

C COMPUTE ENGINE

CONTROL

Description: Allows the user to enable and configure the compute engine.

Usage: C [option] [argument]

Command

combinations:

CTn

CREn RTM output control (1 Æ Enable, 0 Æ Disable)

CRSa.b.c.d Selects CE addresses for RTM output

Example: CE0

CT3 Selects the VBIAS signal for the TMUX output pin

CEn

Comment

Compute Engine Enable (1 Æ Enable, 0 Æ Disable)

Select input n for TMUX output pin. n is interpreted as a decimal number.

Disables CE, followed by “CE OFF” display on LCD. The Demo Code will reset if the WD timer is enabled.

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Commands controlling the Auto-Calibration Function:

CL AUTO-CALIBRATION

Comment

CONTROL

Description: Allows the user to initiate auto-calibration and to store calibration values.

Usage: CL [option]

Command

combinations:

CLB

Begin auto-calibration. Prior to auto-calibration, the calibration coefficients are automatically restored from flash memory.

CLS

Save calibration coefficients to EEPROM starting at address 0x0004

CLR Restore calibration coefficients from EEPROM

CLD Restore coefficients from flash memory

Example: CLB Starts auto-calibration and saves data automatically.

Before starting the auto-calibration process, target values for voltage, duration and current must be entered in MPU RAM (see section 1.9.5), and the target voltage and current must be applied constantly during calibration. Calibration factors can be saved to EEPROM using the CLS command.

Commands controlling the Pulse Counter Function

CP PULSE-COUNT CONTROL Comment

Description: Allows the user to control the pulse count functions.

Usage: CP [option]

Command

combinations:

CPA

Start pulse counting for time period defined with the CPD command. Pulse counts will display with commands M15.2, M16.2

CPC

Clear the absolute pulse count displays (shown with commands M15.1, M16.1)

CPDn

Set time window for pulse counters to n seconds, n is interpreted as a decimal number.

Example: CPD60 Set time window to 60 seconds.

Pulse counts accumulated over a time window defined by the CPD command will be displayed by M15.2 or M16.2 after

Commands M15.1 and M16.1 will display the absolute

zero with the CPC command (or the XRAM write )1=2). Commands M15.2 and M16.2 will display the number of pulses counted during the interval defined by the CPD command. These displays are reset only after a new reading, as initiated by the CPA command.

the defined time has expired.

pulse count for the W and VAR outputs. These displays are reset to

Commands for Identification and Information:

I INFORMATION MESSAGES Comment

Description: Allows user to read information messages.

Usage: I Displays complete version information

The I command is mainly used to identify the revisions of Demo Code and the contained CE code.

Commands for Controlling the RMS Values Shown on the LCD Display:

MR METER RMS DISPLAY Comment

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71M6534H Demo Board User’s Manual

CONTROL (LCD)

Description: Allows user to select meter RMS display for voltage or current.

Usage: MR [option]. [option]

Command

combinations:

MR2. [phase] Displays instantaneous RMS voltage

Example: MR1.3 Displays phase C RMS current.

Phase 4 is the measured neutral current.

No error message is issued when an invalid parameter is entered, e.g. MR1.8.

Commands for Controlling the MPU Power Save Mode:

PS POWER SAVE MODE Comment

Description: Enters power save mode

Usage: PS

Return to normal mode is achieved by resetting the MPU (Z command).

Commands for Controlling the RTC:

MR1. [phase] Displays instantaneous RMS current

Disables CE, ADC, CKOUT, ECK, RTM, SSI, TMUX

VREF, and serial port, sets MPU clock to 38.4KHz.

RT REAL TIME CLOCK

CONTROL

Description: Allows the user to read and set the real time clock.

Usage: RT [option] [value] … [value]

Command

combinations:

RTR Read Real Time Clock.

RTTh.m.s Time of day: (hr, min, sec).

RTAs.t

Example: RTD05.03.17.5 Programs the RTC to Thursday, 3/17/2005

RTA1.+1234 Speeds up the RTC by 1234 PPB.

The “Military Time Format” is used for the RTC, i.e. 15:00 is 3:00 PM.

RTDy.m.d.w: Day of week

Comment

(year, month, day, weekday [1 = Sunday]). If the weekday is omitted it is set automatically.

Real Time Adjust: (start, trim). Allows trimming of the RTC. If s > 0, the speed of the clock will be adjusted by ‘t’ parts per billion (PPB). If the CE is on, the value entered with 't' will be changing with temperature, based on Y_CAL, Y_CALC and Y_CALC2.

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Commands for Accessing the Trim Control Registers:

T TRIM CONTROL Comment

Description: Allows user to read trim and fuse values.

Usage: T [option]

Command

T4 Read fuse 4 (TRIMM).

combinations:

T5 Read fuse 5 (TRIMBGA)

T6 Read fuse 6 (TRIMBGB).

Example: T4 Reads the TRIMM fuse.

These commands are only accessible for the 71M6534H (0.1%) parts. When used on a 71M6534 (0.5%) part, the results will be displayed as zero.

Reset Commands:

W RESET Comment

Description: Watchdog control

Usage: W

Halts the Demo Code program, thus suppressing the triggering of the hardware watchdog timer. This will cause a reset, if the watchdog timer is enabled.

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71M6534H Demo Board User’s Manual

Commands for Controlling the Metering Values Shown on the LCD Display:

M METER DISPLAY

CONTROL (LCD)

Description: Allows user to select internal variables to be displayed.

Usage: M [option]. [option]

Command

combinations:

M0 Wh Total Consumption (display wraps around at 999.999)

M1 Temperature (C° delta from nominal)

M2 Frequency (Hz)

M3. [phase] Wh Total Consumption (display wraps around at 999.999)

M4. [phase] Wh Total Inverse Consumption (display wraps around at 999.999)

M5. [phase] VARh Total Consumption (display wraps around at 999.999)

M6. [phase]

M7. [phase] VAh Total (display wraps around at 999.999)

M8 Operating Time (in hours)

M9 Real Time Clock

M10 Calendar Date

M11. [phase] Power factor

M13 Mains edge count for the last accumulation interval

M13.1

M13.2 CE main edge count for the last accumulation interval

M14.1 Absolute count for W pulses. Reset with CPC command.

M14.2 Count for W pulses in time window defined by the CPD command.

M15.1 Absolute count for VAR pulses. Reset with CPC command.

M15.2 Count for W pulses in time window defined by the CPD command.

Example: M3.3 Displays Wh total consumption of phase C.

M5.0 Displays VARh total consumption for all phases.

Displays for total consumption wrap around at 999.999Wh (or VARh, VAh) due to the limited

number of available display digits. Internal registers (counters) of the Demo Code are 64 bits wide and do not wrap around.

M Wh Total Consumption (display wraps around at 999.999)

Comment

VARh Total Inverse Consumption (display wraps around at

999.999)

Main edge count (accumulated) – zero transitions of the input signal

When entering the phase parameter, use 1 for phase A, 2 for phase B, 3 for phase C, and 0 or blank for all phases.

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71M6534H Demo Board User’s Manual

1.8.2 USING THE DEMO BOARD FOR ENERGY MEASUREMENTS

The 71M6534/6534H Demo Board was designed for use with current transformers (CT).

The Demo Board may immediately be used with current transformers having 2,000:1 winding ratio and is programmed for a Kh factor of 3.2 and (see Section 1.8.4 for adjusting the Demo Board for transformers with different turns ratio).

Once, voltage is applied and load current is flowing, the red LED D5 will flash each time an energy sum of 3.2 Wh is collected. The LCD display will show the accumulated energy in Wh when set to display mode 3 (command

Similarly, the red LED D6 will flash each time an energy sum of 3.2 VARh is collected. The LCD display will show the accumulated energy in VARh when set to display mode 5 (command

>M3 via the serial interface).

>M5 via the serial interface).

1.8.3 ADJUSTING THE KH FACTOR FOR THE DEMO BOARD

The 71M6534/6534H Demo Board is shipped with a pre-programmed scaling factor Kh of 3.2, i.e. 3.2Wh per pulse. In order to be used with a calibrated load or a meter calibration system, the board should be connected to the AC power source using the spade terminals on the bottom of the board. The current transformers should be connected to the dual-pin headers on the bottom of the board. The connection is the same for single-ended or differential mode. See chapter 3.1 for proper jumper settings.

The Kh value can be derived by reading the values for IMAX and VMAX (i.e. the RMS current and voltage values that correspond to the 250mV maximum input signal to the IC), and inserting them in the following equation for Kh:

Kh = IMAX * VMAX * 66.1782 / (In_8 * WRATE * N

The small deviation between the adjusted Kh of 3.19902 and the ideal Kh of 3.2 is covered by calibration. The default values used for the 71M6534/6534H Demo Board are:

WRATE: 171

IMAX: 208 VMAX: 600 In_8: 1 (controlled by IA_SHUNT = -15)

: 2520

ACC

X: 6

Explanation of factors used in the Kh calculation:

* X) = 3.19902 Wh/pulse.

ACC

WRATE: The factor input by the user to determine Kh IMAX: The current input scaling factor, i.e. the input current generating 176.8mVrms at the IA/IB/IC

input pins of the 71M6534. 176.8mV rms is equivalent to 250mV peak.

VMAX: The voltage input scaling factor, i.e. the voltage generating 176.8mVrms at the VA/VB/VC

input pins of the 71M6534

In_8: The setting for the additional ADC gain (8 or 1) determined by the CE register IA_SHUNT

: The number of samples per accumulation interval, i.e. PRE_SAMPS *SUM_CYCLES

ACC

X: The pulse rate control factor determined by the CE registers

PULSE_SLOW and

PULSE_FAST

Almost any desired Kh factor can be selected for the Demo Board by resolving the formula for WRATE:

WRATE = (IMAX * VMAX * 66.1782) / (Kh * In_8 * N

For the Kh of 3.2Wh, the value 171 (decimal) should be entered for command

>]21=+171).

* X)

ACC

WRATE at CE location 0x21 (using the CLI

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71M6534H Demo Board User’s Manual

1.8.4 ADJUSTING THE DEMO BOARDS TO DIFFERENT CURRENT TRANSFORMERS

The Demo Board is prepared for use with 2000:1 current transformers (CTs). This means that for the unmodified Demo Board, 208A on the primary side at 2000:1 ratio result in 104mA on the secondary side, causing

176.8mV at the 1.7Ω resistor pairs R24/R25, R36/R37, R56/R57 (2 x 3.4Ω in parallel).

In general, when

IMAX is applied to the primary side of the CT, the voltage V

at the IA, IB, or IC input of the

71M6534 IC is determined by the following formula:

= R * I = R * IMAX/N

where N = transformer winding ratio, R = resistor on the secondary side

If, for example, if the current corresponding to

IMAX = 208A is applied to a CT with a 2500:1 ratio, only 83.2mA

will be generated on the secondary side, causing only 141mV of voltage drop.

The steps required to adapt a 71M6534 Demo Board to a transformer with a winding ratio of 2500:1 are outlined below:

1) The formula R

= 176.8mV/(IMAX/N) is applied to calculate the new resistor R

. We calculate Rx to 2.115Ω

2) Changing the resistors R24/R25, R106/R107 to a combined resistance of 2.115Ω (for each pair) will

cause the desired voltage drop of 176.8mV appearing at the IA, IB, or IC inputs of the 71M6534 IC.

Simply scaling IMAX is not recommended, since peak voltages at the 71M6534 inputs should always be in the

range of 0 through ±250mV (equivalent to 176.8mV rms). If a CT with a much lower winding ratio than 1:2,000 is used, higher secondary currents will result, causing excessive voltages at the 71M6534 inputs. Conversely, CTs with much higher ratio will tend to decrease the useable signal voltage range at the 71M6534 inputs and may thus decrease resolution.

1.8.5 ADJUSTING THE DEMO BOARDS TO DIFFERENT VOLTAGE DIVIDERS

The 71M6534 Demo Board comes equipped with its own network of resistor dividers for voltage measurement mounted on the PCB. The resistor values are 2.5477MΩ (for channel A, R15-R21, R26-R31 combined) and 750Ω (R32), resulting in a ratio (R

600V. A large value for VMAX has been selected in order to have headroom for overvoltages. This choice need

not be of concern, since the ADC in the 71M6534 has enough resolution, even when operating at 120Vrms. If a different set of voltage dividers or an external voltage transformer (potential transformer) is to be used,

scaling techniques similar to those applied for the current transformer should be used.

In the following example we assume that the line voltage is not applied to the resistor divider for VA formed by R15-R21, R26-R31, and R32, but to a voltage transformer with a ratio N of 20:1, followed by a simple resistor

divider. We also assume that we want to maintain the value for VMAX at 600V to provide headroom for large

voltage excursions.

) of 1:3,393.933. This means that VMAX equals 176.78mV*3,393.933 =

When applying

is scaled by the resistor divider ratio RR. When the input voltage to the voltage channel of the 71M6534 is the

desired 176.8mV, V

Resolving for R

VMAX at the primary side of the transformer, the secondary voltage V

= VMAX / N

is then given by:

= RR * 176.8mV

, we get:

= (VMAX / N) / 176.8mV = (600V / 30) / 176.8mV = 170.45

is:

This divider ratio can be implemented, for example, with a combination of one 16.95kΩ and one 100Ω resistor.

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71M6534H Demo Board User’s Manual

If potential transformers (PTs) are used instead of resistor dividers, phase shifts will be introduced that will require negative phase angle compensation. TERIDIAN Demo Code accepts negative calibration factors for phase.

1.9 CALIBRATION PARAMETERS

1.9.1 GENERAL CALIBRATION PROCEDURE

Any calibration method can be used with the 71M6534/6534H chips. This Demo Board User’s Manual presents calibration methods with three or five measurements as recommended methods, because they work with most manual calibration systems based on counting "pulses" (emitted by LEDs on the meter).

Naturally, a meter in mass production will be equipped with special calibration code offering capabilities beyond those of the Demo Code. It is basically possible to calibrate using voltage and current readings, with or without pulses involved. For this purpose, the MPU Demo Code can be modified to display averaged voltage and current values (as opposed to momentary values). Also, automated calibration equipment can communicate with the Demo Boards via the serial interface and extract voltage and current readings. This is possible even with the unmodified Demo Code.

A complete calibration procedure is given in section 2.2 of this manual.

Regardless of the calibration procedure used, parameters (calibration factors) will result that will have to be applied to the 71M6534/6534H chip in order to make the chip apply the modified gains and phase shifts necessary for accurate operation. Table 1-5 shows the names of the calibration factors, their function, and their location in the CE RAM.

Again, the command line interface can be used to store the calibration factors in their respective CE RAM addresses. For example, the command

>]10=+16302

stores the decimal value 16302 in the CE RAM location controlling the gain of the current channel (CAL_IA) for

phase A.

The command

>]11=4005

stores the hexadecimal value 0x4005 (decimal 16389) in the CE RAM location controlling the gain of the

voltage channel for phase A (CAL_VA).

Constant

CAL_VA CAL_VB

CAL_VC

CAL_IA CAL_IB CAL_IC

PHADJ_A PHADJ_B

PHADJ_C

Address

(hex)

0x11 0x13 0x15

0x10 0x12 0x14

0x18 0x19

0x1A

Table 1-5: CE RAM Locations for Calibration Constants

Description

Adjusts the gain of the voltage channels. +16384 is the typical value. The gain is directly proportional to the CAL parameter. Allowed range is 0 to

32767. If the gain is 1% slow, CAL should be increased by 1%.

Adjusts the gain of the current channels. +16384 is the typical value. The gain is directly proportional to the CAL parameter. Allowed range is 0 to

32767. If the gain is 1% slow, CAL should be increased by 1%.

This constant controls the CT phase compensation. No compensation occurs when PHADJ=0. As PHADJ is increased, more compensation is introduced.

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71M6534H Demo Board User’s Manual

1.9.2 CALIBRATION MACRO FILE

The macro file in Figure 1-6 contains a sequence of the serial interface commands. It is a simple text file and can be created with Notepad or an equivalent ASCII editor program. The file is executed with HyperTerminal’s

Transfer->Send Text File command.

CE0 /disable CE ]10=+16022 /CAL_IA (gain=CAL_IA/16384) ]11=+16381 /CAL_VA (gain=CAL_VA/16384) ]12=+16019 /CAL_IB (gain=CAL_IB/16384) ]13=+16370 /CAL_VB (gain=CAL_VB/16384) ]14=+15994 /CAL_IC (gain=CAL_IC/16384) ]15=+16376 /CAL_VC (gain=CAL_VC/16384) ]18=+115 /PHADJ_A (default 0) ]19=+113 /PHADJ_B (default 0) ]1A=+109 /PHADJ_C (default 0)

Figure 1-6: Typical Calibration Macro File

It is possible to send the calibration macro file to the 71M6534H for “temporary” calibration. This will temporarily change the CE data values. Upon power up, these values are refreshed back to the default values stored in flash memory. Thus, until the flash memory is updated, the macro file must be loaded each time the part is

powered up. The macro file is run by sending it with the transfer

Use the Transfer

Send Text File command!

send text file procedure of HyperTerminal.

1.9.3 UPDATING THE 6534_DEMO.HEX FILE

The d_merge program updates the 6534_demo.hex file with the values contained in the macro file. This program is executed from a DOS command line window. Executing the d_merge program with no arguments will display the syntax description. To merge macro.txt and old_6534_demo.hex into new_6534_demo.hex, use the command:

d_merge old_6534_demo.hex macro.txt new_6534_demo.hex

The new hex file can be written to the 71M6534H through the ICE port using the ADM51 in-circuit emulator. This step makes the calibration to the meter permanent.

1.9.4 UPDATING CALIBRATION DATA IN FLASH MEMORY WITHOUT USING THE ICE OR A PROGRAMMER

It is possible to make data permanent that had been entered temporarily into the CE RAM. The transfer to EEPROM memory is done using the following serial interface command:

>]U

Thus, after transferring calibration data with manual serial interface commands or with a macro file, all that has to be done is invoking the U command.

After reset, calibration data is copied from the EEPROM, if present. Otherwise, calibration data is copied from the flash memory. Writing 0xFF into the first few bytes of the EEPROM deactivates any calibration data previously stored to the EEPROM.

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71M6534H Demo Board User’s Manual

1.9.5 AUTOMATIC CALIBRATION (AUTO-CAL)

The Demo Code is able to perform a single-point fast automatic calibration, as described in section 2.2.3. This calibration is performed for channels A, B, and C only, not for the NEUTRAL channel. The steps required for the calibration are:

1. Enter operating values for voltage and current in I/O RAM. The voltage is entered at MPU address 0x10 (e.g. with the command

command )11=+300 for 30A) and the duration measured in accumulation intervals is entered at 0x0F.

2. The operating voltage and current defined in step 1 must be applied at a zero degree phase angle to the meter (Demo Board).

3. The CLB (Begin Calibration) command must be entered via the serial interface. The operating voltage and current must be maintained accurately while the calibration is being performed.

4. The calibration procedure will automatically reset CE addresses used to store the calibration factors to their default values prior to starting the calibration. Automatic calibration also reads the chip temperature and enters it at the proper CE location temperature compensation.

5. CE addresses 0x10 to 0x15 and 0x18 to 0x1A will now show the new values determined by the autocalibration procedure. These values can be stored in EEPROM by issuing the CLS command.

Tip: Current transformers of a given type usually have very similar phase angle for identical operating conditions. If the phase angle is accurately determined for one current transformer, the corresponding

phase adjustment coefficient PHADJ_X can be entered for all calibrated units.

)10=+2400 for 240V), the current is entered at 0x11 (e.g. with the

1.9.6 LOADING THE 6534_DEMO.HEX FILE INTO THE DEMO BOARD

Hardware Interface for Programming: The 71M6534/6534H IC provides an interface for loading code into the

internal flash memory. This interface consists of the following signals:

E_RXTX (data), E_TCLK (clock), E_RST (reset), ICE_E (ICE enable) These signals, along with V3P3D and GND are available on the emulator header J14. Production meters may be equipped with much simpler programming connectors, e.g. a 6x1 header.

Programming of the flash memory requires a specific in-circuit emulator, the ADM51 by Signum Systems (http//www.signumsystems.com) or the Flash Programmer (TFP-2) provided by TERIDIAN Semiconductor.

Chips may also be programmed before they are soldered to the board. The TGP1 gang programmer suitable for high-volume production is available from TERIDIAN. It must be equipped with LQFP-120 sockets.

In-Circuit Emulator: If firmware exists in the 71M6534/6534H flash memory; it has to be erased before loading a new file into memory. Figure 1-7 and Figure 1-8 show the emulator software active. In order to erase the flash memory, the RESET button of the emulator software has to be clicked followed by the ERASE button ().

Once the flash memory is erased, the new file can be loaded using the commands File followed by Load. The dialog box shown in Figure 1-8 will then appear making it possible to select the file to be loaded by clicking the Browse button. Once the file is selected, pressing the OK button will load the file into the flash memory of the 71M6534/6534H IC.

At this point, the emulator probe (cable) can be removed. Once the 71M6534/6534H IC is reset using the reset button on the Demo Board, the new code starts executing.

Flash Programmer Module (TFP-2): Follow the instructions given in the User Manual for the TFP-2.

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71M6534H Demo Board User’s Manual

Figure 1-7: Emulator Window Showing Reset and Erase Buttons (see Arrows)

Figure 1-8: Emulator Window Showing Erased Flash Memory and File Load Menu

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71M6534H Demo Board User’s Manual

1.9.7 THE PROGRAMMING INTERFACE OF THE 71M6534/6534H

Flash Downloader/ICE Interface Signals

The signals listed in Table 1-6 are necessary for communication between the Flash Downloader or ICE and the 71M6534/6534H.

Signal Direction Function

E_TCLK Output from 71M6534/6534H Data clock

E_RXTX Bi-directional Data input/output

E_RST Input to the 71M6534/6534H Flash Downloader Reset (active low)

ICE_E Input to the 71M6534/6534H

Table 1-6: Flash Programming Interface Signals

The other signals accessible at the emulator interface connector J14 (E_TBUS[0]-E_TBUS[3], E_ISYNC) can be used for an optional trace debugger.

The E_RST signal should only be driven by the Flash Downloader when enabling these interface signals. The Flash Downloader must release E_RST at all other times.

Enable signal for the ICE interface. Must be high for all emulation or programming operations.

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1.10 DEMO CODE

1.10.1 DEMO CODE DESCRIPTION

The Demo Board is shipped preloaded with Demo Code revision 4.6q or later in the 71M6534 or 71M6534H chip. The code revision can easily be verified by entering the command >i via the serial interface (see section

1.8.1). Check with your local TERIDIAN representative or FAE for the latest revision.

The Demo Code offers the following features:

• It provides basic metering functions such as pulse generation, display of accumulated energy, frequency, date/time, and enables the user to evaluate the parameters of the metering IC such as accuracy, harmonic performance, etc.

• It maintains and provides access to basic household functions such as real-time clock (RTC).

• It provides access to control and display functions via the serial interface, enabling the user to view

and modify a variety of meter parameters such as Kh, calibration coefficients, temperature compensation etc.

• It provides libraries for access of low-level IC functions to serve as building blocks for code development.

A detailed description of the Demo Code can be found in the Software User’s Guide (SUG). In addition, the comments contained in the library provided with the Demo Kit can serve as useful documentation.

The Software User’s Guide contains the following information:

• Design guide

• Design reference for routines

• Tool Installation Guide

• List of library functions

• 80515 MPU Reference (hardware, instruction set, memory, registers)

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71M6534H Demo Board User’s Manual

1.10.2 IMPORTANT DEMO CODE MPU PARAMETERS

In the Demo Code, certain MPU XRAM parameters have been given fixed addresses in order to permit easy external access. These variables can be read via the serial interface, as described in section 1.7.1, with the )n$ command and written with the )n=xx command where n is the word address. Note that accumulation variables are 64 bits long and are accessed with )n$$ (read) and )n=hh=ll (write) in the case of accumulation variables. Default values are the values assigned by the Demo Code on start-up.

All MPU Input Parameters are loaded by the MPU at startup and should not need adjustment during meter calibration.

MPU Input Parameters for Metering

XRAM Word

Address

0x00

0x01 0

0x02 764569660

0x03 275652520

Default

Value

433199

Name Description

For each element, if WSUM_X or VARSUM_X of that element exceeds WCREEP_THR, the sample values for that element are

not zeroed. Otherwise, the accumulators for Wh, VARh, and VAh are not updated and the instantaneous value of IRMS for that element is zeroed.

ITHRSHLDA

The default value is equivalent to 0.08A. Setting zero disables creep control. Bit 0: Sets VA calculation mode.

CONFIG

PK_VTHR

0: V

Bit 1: Clears accumulators for Wh, VARh, and VAh. This bit need not be reset.

When the voltage exceeds this value, bit 5 in the MPU status word is set, and the MPU might choose to log a warning. Event logs are not implemented in Demo Code.

The default value is equivalent to 20% above 240Vrms.

When the current exceeds this value, bit 6 in the MPU status word is set, and the MPU might choose to log a warning. Event logs are not implemented in Demo Code.

PK_ITHR

RMS*ARMS

2I0SQSUM ⋅=LSB

2V0SQSUM ⋅=LSB

2I0SQSUM ⋅=LSB

VARW +

ITHRSHLDA to

The default value is equivalent to 20% above 30A

0x04 0

0x05 0

0x06 0

Y_CAL_DEG0 Y_CAL_DEG1

Y_CAL_DEG2

RTC adjust, 100ppb. Read only at reset in demo code. RTC adjust, linear by temperature, 10ppb*ΔT, in 0.1˚C. Provided

for optional code. RTC adjust, squared by temperature, 1ppb*ΔT2, in 0.1˚C. Provided for optional code.

RMS

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71M6534H Demo Board User’s Manual

XRAM Word

Address

0x07 0

0x08 4

0x09 6000

0x0A 2080

0x0B 0

0x0C 0

0x0D

0x0E

0x0F 2

0x10 2400

0x11 300

0x12 75087832

0x13 50

0x14 --

0x15 --

0x16 --

Default

Value

Name Description

This address contains a number that points to the selected pulse

PULSEW_SRC

PULSER_SRC

VMAX

IMAX

PPMC

PPMC2

PULSEX_SRC

PULSEY_SRC

SCAL

VCAL

ICAL

VTHRSHLD

PULSE_WIDTH

TEMP_NOM

NCOUNT

source for the Wh output. Selectable pulse sources are listed in Table 1-8.

This address contains a number that points to the selected pulse source for the VARh output. Selectable pulse sources are listed in Table 1-8.

The nominal external RMS voltage that corresponds to 250mV peak at the ADC input. The meter uses this value to convert internal quantities to external. LSB=0.1V

The nominal external RMS current that corresponds to 250mV peak at the ADC input for channel A. The meter uses this value to convert internal quantities to external. LSB=0.1A

PPM/C*26.84. Linear temperature compensation. A positive value will cause the meter to run faster when hot. This is applied to both V and I and will therefore have a double effect on products.

PPM/C2*1374. Square law compensation. A positive value will cause the meter to run faster when hot. This is applied to both V and I and will therefore have a double effect on products.

This address contains a number that points to the selected pulse source for the XPULSE output. Selectable pulse sources are listed in Table 1-8.

This address contains a number that points to the selected pulse source for the YPULSE output. Selectable pulse sources are listed in Table 1-8.

Count of accumulation intervals for auto-calibration.

Applied voltage for auto-calibration. LSB = 0.1V rms of AC signal applied to all elements during calibration.

Applied current for auto-calibration. LSB = 0.1A rms of AC signal applied to all elements during calibration. Power factor must be

Voltage to be used for creep detection, measuring frequency, zero crossing, etc.

Pulse width in µs = (2*PulseWidth + 1)*397. 0xFF disables this feature. Takes effect only at start-up.

Nominal (reference) temperature, i.e. the temperature at which

calibration occurred. LSB = Units of TEMP_RAW, from CE.

The count of accumulation intervals that the neutral current must be above bit.

The neutral current threshold.

INTHRSHLD

INTHRSHLD required to set the “excess neutral” error

2IxSQSUM ⋅=LSB

Table 1-7: MPU Input Parameters for Metering

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71M6534H Demo Board User’s Manual

Any of the values listed in Table 1-8 can be selected for as a source for PULSEW and PULSER. The designation “source_I” refers to values imported by the consumer; “source_E” refers to energy exported by the consumer (energy generation).

Number Pulse Source Description Number Pulse Source Description

WSUM

W0SUM

W1SUM

W2SUM

VARSUM

VAR0SUM

VAR1SUM

VAR2SUM

I0SQSUM

I1SQSUM

I2SQSUM

INSQSUM

V0SQSUM

V1SQSUM

V2SQSUM

VASUM

VA0SUM

VA1SUM

Default for

PULSEW_SRC

Default for

PULSER_SRC

VA2SUM

WSUM_I

W0SUM_I

W1SUM_I

W2SUM_I

VARSUM_I

VAR0SUM_I

VAR1SUM_I

WSUM_E

W0SUM_E

W1SUM_E

W2SUM_E

VARSUM_E

VAR0SUM_E

VAR1SUM_E

VAR2SUM_E

Sum of imported real energy

Imported real energy on element A

Imported real energy on element B

Imported real energy on element C

Sum of imported reactive energy

Imported reactive energy on element A

Imported reactive energy on element B

Imported reactive energy on element C

Sum of exported real energy

Exported real energy on element A

Exported real energy on element B

Exported real energy on element C

Sum of exported reactive energy

Exported reactive energy on element A

Exported reactive energy on element B

Exported reactive energy on element C

Table 1-8: Selectable Pulse Sources

MPU INSTANTANEOUS OUTPUT VARIABLES

The Demo Code processes CE outputs after each accumulation interval. It calculates instantaneous values such as VRMS, IRMS, W and VA as well as accumulated values such as Wh, VARh, and VAh. Table 1-9 lists the calculated instantaneous values.

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71M6534H Demo Board User’s Manual

XRAM

Word

Address

0x24 0x26 0x28

0x25 0x27 0x29

0x20 Delta_T

0x21 Frequency

MPU STATUS WORD

The MPU maintains the status of certain meter and I/O related variables in the Status Word. The Status Word is located at address 0x21. The bit assignments are listed in Table 1-10.

Name DESCRIPTION

Vrms_A

Vrms_B*

Vrms_C

Irms_A Irms_B Irms_C Irms_N

Table 1-9: MPU Instantaneous Output Variables

from element 0, 1, 2.

rms

from element 0, 1, 2 or neutral

rms

Deviation from Calibration (reference) temperature. LSB = 0.1 0C.

Frequency of voltage selected by CE input. If the selected voltage is below the sag threshold, Frequency=0. LSB Hz

2VxSQSUM ⋅=LSB

2IxSQSUM ⋅=LSB

Status

Word Bit

5 6 7

Name DESCRIPTION

Indicates that all elements are in creep mode. The CE’s pulse variables

CREEP

MINVC

PB_PRESS

SPURIOUS

MINVB

MAXVA MAXVB

MAXVC

MINVA

WD_DETECT

MAXIN MAXIA MAXIB MAXIC

MINT

will be “jammed” with a constant value on every accumulation interval to prevent spurious pulses. Note that creep mode therefore halts pulsing even when the CE’s pulse mode is “internal”. Element C has a voltage below VThrshld. This forces that element into creep mode. A push button press was recorded at the most recent reset or wake from a battery mode.

An unexpected interrupt was detected. Element B has a voltage below VThrshld. This forces that element into

creep mode. Element A has a voltage above VThrshldP.

Element B has a voltage above VThrshldP. Element C has a voltage above VThrshldP. Element A has a voltage below VThrshld. This forces that element into

creep mode. It also forces the frequency and main edge count to zero. The most recent reset was a watchdog reset. This usually indicates a software error. The neutral current is over INThrshld. In a real meter this could indicate faulty distribution or tampering. The current of element A is over IThrshld. In a real meter this could indicate overload. The current of element B is over IThrshld. In a real meter this could indicate overload. The current of element C is over IThrshld. In a real meter this could indicate overload. The temperature is below the minimum, -40C, established in option_gbl.h. This is not very accurate in the demo code, because the calibration temperature is usually poorly controlled, and the default temp_nom is usually many degrees off. –40C is the minimum recommended operating temperature of the chip.

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71M6534H Demo Board User’s Manual

Status

Word Bit

21 22 23

Name DESCRIPTION

The temperature is above the maximum, 85C, established in option_gbl.h. This is not very accurate in the demo code, because the calibration

MAXT

BATTERY_BAD

CLOCK_TAMPER

CAL_BAD

CLOCK_UNSET

POWER_BAD

GNDNEUTRAL

TAMPER

SOFTWARE

SAGA

SAGB

SAGC‡

F0_CE

ONE_SEC

temperature is usually poorly controlled, and the default temp_nom is usually many degrees off. 85C is the maximum recommended operating temperature of the chip. Just after midnight, the demo code sets this bit if VBat < VBatMin. The read is infrequent to reduce battery loading to very low values. When the battery voltage is being displayed, the read occurs every second, for up to 20 seconds.

Clock set to a new value more than two hours from the previous value. Set after reset when the read of the calibration data has a bad longitudinal

redundancy check or read failure. Set when the clock’s current reading is A) More than a year after the previously saved reading, or B) Earlier than the previously saved reading, or C) There is no previously saved reading. Set after reset when the read of the power register data has a bad longitudinal redundancy check or read failure in both copies. Two copies are used because a power failure can occur while one of the copies is being updated. Indicates that a grounded neutral was detected.

Tamper was detected †** A software defect was detected. Element A has a sag condition. This bit is set in real time by the CE and

detected by the ce_busy interrupt (ce_busy_isr() in ce.c) within 8 sample intervals, about 2.6ms. A transition from normal operation to SAGA causes the power registers to be saved, because the demo PCB is powered from element A. Element B has a sag condition. This bit is set in real time by the CE and detected by the ce_busy interrupt (ce_busy_isr() in ce.c) within 8 sample intervals, about 2.6ms.

Element C has a sag condition. See the description of the other sag bits. A square wave at the line frequency, with a jitter of up to 8 sample

intervals, about 2.6ms. Changes each accumulation interval.

Table 1-10: MPU Status Word Bit Assignment

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71M6534H Demo Board User’s Manual

MPU ACCUMULATION OUTPUT VARIABLES

Accumulation values are accumulated from XFER cycle to XFER cycle (see Table 1-11). They are organized as two 32-bit registers. The first register stores the decimal number displayed on the LCD. For example, if the LCD shows “001.004”, the value in the first register is 1004. This register wraps around after the value 999999 is reached. The second register holds fractions of the accumulated energy, with an LSB of

9.4045*10

-13

*VMAX*IMAX*In_8 Wh.

The MPU accumulation registers always hold positive values.

The CLI commands with two question marks, e.g. )39?? should be used to read the variables.

XRAM

Word

Name Description

Address

0x2C

0x44

0x34

0x4C

0x3C

0x2E

0x46

0x36

0x4E

0x3E

0x30

0x48

0x38

0x50

0x40

0x32

0x4A

0x3A

0x52

0x42

Whi

Whe

VARhi

VARhe

VAh

Whi_A

Whe_A

VARhi_A

VARhe_A

VAh_A

Whi_B

Whe_B

VARhi_B

VARhe_B

Vah_B Whi_C

Whe_C

VARhi_C

VARhe_C

VAh_C

Total Watt hours consumed (imported)

Total Watt hours generated (exported)

Total VAR hours consumed

Total VAR hours generated (inverse consumed)

Total VA hours

Total Watt hours consumed through element 0

Total Watt hours generated (inverse consumed) through element 0

Total VAR hours consumed through element 0

Total VAR hours generated (inverse consumed) through element 0

Total VA hours in element 0

Total Watt hours consumed through element 1

Total Watt hours generated (inverse consumed) through element 1

Total VAR hours consumed through element 1

Total VAR hours generated (inverse consumed) through element 1

Total VA hours in element 1

Total Watt hours consumed through element 2

Total Watt hours generated (inverse consumed) through element 2

Total VAR hours consumed through element 2

Total VAR hours generated (inverse consumed) through element 2

Total VA hours in element 2

Table 1-11: MPU Accumulation Output Variables

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71M6534H Demo Board User’s Manual

1.10.3 USEFUL CLI COMMANDS INVOLVING THE MPU AND CE

Table 1-12 shows a few essential commands involving MPU data memory.

Command Description

)1=2 Clears the accumulators for Wh, VARh, and VAh by setting bit 1 of the CONFIG register.

)A=+2080 Applies the value 208A to the IMAX register

)9=+6000 Applies the value 600V to the VMAX register

)2F?? Displays the total accumulated imported Wh energy

MR2.1 Displays the current RMS voltage in phase A

MR1.2 Displays the current RMS current in phase B

RI5=26

RI5=6 Re-enables the emulator clock by clearing bit 5 in I/O RAM address 0x05.

Disables the emulator clock by setting bit 5 in I/O RAM address 0x05. This command will disable emulator/programmer access to the 71M6534.

Stores the current CE RAM variables in EEPROM memory. The variables stored in flash memory will be applied by the MPU at the next reset or power-up if no valid data is available from the EEPROM.

Table 1-12: CLI Commands for MPU Data Memory

1.11 USING THE ICE (IN-CIRCUIT EMULATOR)

The ADM51 ICE by Signum Systems (www.signum.com) can be used to erase the flash memory, load code and debug firmware. Before using the ICE, the latest WEMU51 application program should be downloaded from the Signum website and installed.

It is very important to create a new project and selecting the TERIDI AN 71M6534 IC in the project d ialog when starting a 6534-based design. Using the ICE with project settings co pied from a 6521 or 651X designs will lead to erratic results.

For details on installing the WEMU51 program and on creating a project, see the SUG 653X (Software Users’ Guide).

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71M6534H Demo Board User’s Manual

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71M6534H Demo Board User’s Manual

IVI

L X

A A IVA

φ φ

A I A

2 APPLICATION INFORMATION

2.1 CALIBRATION THEORY

A typical meter has phase and gain errors as shown by φS, AXI, and AXV in Figure 2-1. Following the typical meter convention of current phase being in the lag direction, the small amount of phase lead in a typical current sensor is represented as -φ They include errors in voltage attenuators, current sensors, and in ADC gains. In other words, no errors are made in the ‘input’ or ‘meter’ boxes.

. The errors shown in Figure 2-1 represent the sum of all gain and phase errors.

INPUT

is phase lag

−

is phase lead

ERRORS

RROR

METER

≡

CTUAL

RMS

−

DEAL

Figure 2-1: Watt Meter with Gain and Phase Errors.

During the calibration phase, we measure errors and then introduce correction factors to nullify their effect. With three unknowns to determine, we must make at least three measurements. If we make more measurements, we can average the results.

A fast method of calibration will also be introduced in section 2.1.3.

2.1.1 CALIBRATION WITH THREE MEASUREMENTS

The simplest calibration method is to make three measurements. Typically, a voltage measurement and two Watt-hour (Wh) measurements are made. A voltage display can be obtained for test purposes via the command >MR2.1 in the serial interface.

Let’s say the voltage measurement has the error E where E percentage values. They should be zero when the meter is accurate and negative when the meter runs slow. The fundamental frequency is f

calibration factors to nominal: CAL_IA = 16384, CAL_VA = 16384, PHADJA = 0.

is measured with φL = 0 and E60 is measured with φL = 60. These values should be simple ratios—not

. T is equal to 1/fS, where fS is the sample frequency (2560.62Hz). Set all

and the two Wh measurements have errors E0 and E60,

DEAL

CTUAL

DEAL

CTUAL

DEAL

CTUAL

) cos(

CTUAL V

−

)cos(

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71M6534H Demo Board User’s Manual

From the voltage measurement, we determine that

1+=

1.Î

VXV

We use the other two measurements to determine φ

2a.

3a.

Combining 2a and 3a:

6.Î

XIXV

)tan(

−

tan

AAIV

)0cos(

)cos(

AAIV

[]

EEE

++=

0060 S

−

060

⎛ ⎜

⎜

⎝

−

)0cos(

−

SXIXV

)60cos(

−

SXIXV

)60cos(

AAAA

)tan()60tan()1(

)60tan()1(

⎞

060

⎟ ⎟

)60tan()1(

⎠

and AXI.

=−

1)cos(1

XIXV

φφ

−=−

SXIXV

)60cos(

−

)60cos(

)sin()60sin()cos()60cos(

SSXIXV

−

1)sin()60tan()cos( −+=

SXIXVSXIXV

and from 2a:

7.Î

Now that we know the AXV, AXI, and φS errors, we calculate the new calibration voltage gain coefficient from the previous ones:

We calculate PHADJ from φ

PHADJ

VCAL__ =

NEW

⎡

⎢ ⎣

)cos(

SXV

VCAL

, the desired phase lag:

−−

[]

929

−−−+

−−

[]

−−−−

πφ

πφπ

⎤

)2cos()21(2)21(1)tan(

⎥

)2cos()21(1)tan()2sin()21(

TfTf

⎦

Page: 42 of 86

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71M6534H Demo Board User’s Manual

And we calculate the new calibration current gain coefficient, including compensation for a slight gain increase in the phase calibration circuit.

ICAL

NEW

ICAL

2.1.2 CALIBRATION WITH FIVE MEASUREMENTS

The five measurement method provides more orthogonality between the gain and phase error derivations. This

1+=

AAIV

180

, E0, E

AAEE

1800

method involves measuring E

16384, CAL_VA = 16384, PHADJA = 0.

First, calculate A

1.Î

Calculate AXI from E0 and E

180

from EV:

VXV

1800

XIXV

)0cos(

)cos(2

, E60, and E

180

−

SXIXV

−

)180cos(

SXIXV

. Again, set all calibration factors to nominal, i.e. CAL_IA =

300

)0cos(

)180cos(

SXIXV

2)cos(2

−=+

92020

−−−

−−+

1)cos(1

−=−

SXIXV

−=−

SXIXV

−−

−+−−

1)cos(1

)21()2cos()21(21

TfPHADJPHADJ

))2cos()21(222(2

6.Î

Use above results along with E60 and E

Subtract 8 from 7

use equation 5:

10.

11.

300

30060 SXIXV

30060 S

1800

AAIV

=−

12)(

)cos(

SXV

)60cos(

−

AAEE

1800

)cos(

EEEE

180030060 S

to calculate φS.

300

)60cos(

−

SXIXV

−

AAAA

)60cos(

−−

SXIXV

)60cos(

AAAA

++=−

1)sin()60tan()cos( −+=

SXIXVSXIXV

−

1)sin()60tan()cos( −−=

SXIXVSXIXV

)sin()60tan(2

)sin()60tan(

)tan()60tan()2(

Page: 43 of 86

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71M6534H Demo Board User’s Manual

12.Î

Now that we know the A previous ones:

We calculate PHADJ from φ

PHADJ

VCAL__ =

NEW

⎜ ⎝

, AXI, and φS errors, we calculate the new calibration voltage gain coefficient from the

VCAL

⎡

⎢

⎛

−

⎜

tan

⎣

And we calculate the new calibration current gain coefficient, including compensation for a slight gain increase in the phase calibration circuit.

ICAL

NEW

ICAL

2.1.3 FAST CALIBRATION

The calibration methods described so far require that the calibration system sequentially applies currents at various phase angles. A simpler approach is based on the calibration system applying a constant voltage and current at exactly zero degrees phase angle. This approach also requires much simpler mathematical operations.

Before starting the calibration process, the voltage and current calibration factors are set to unity (16384) and the phase compensation factors are set to zero.

During the calibration process, the meter measures for a given constant time, usually 30 seconds, and is then examined for its accumulated Wh and VARh energy values. Access to the internal accumulation registers is necessary for this method of calibration. The phase angle introduced by the voltage and/or current sensors is then simply determined by:

30060

1800

, the desired phase lag:

[]

⎟ ⎟

)2)(60tan(

⎠

−−

929

−−−+

−−

[]

−−−−

πφ

πφπ

⎤

)2cos()21(2)21(1)tan(

−−+

⎥

)2cos()21(1)tan()2sin()21(

TfTf

⎦

92020

−−−

−−

−+−−

)21()2cos()21(21

))2cos()21(222(2

TfPHADJPHADJ

⎞

)(

−

CAL_VA is determined by comparing the applied voltage to the measured voltage, or:

CAL_IA is determined by comparing applied real energy with the measured apparent energy (and

compensating for the change applied to

The derivation of these formulae is shown in the Appendix.

Page: 44 of 86

VARh

atan=

⋅

measured

⋅

applied

⋅

VACALVAh

VACAL ⋅= 16384_

CAL_VA):

16384

IACAL

measured

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71M6534H Demo Board User’s Manual

2.2 CALIBRATION PROCEDURES

Calibration requires that a calibration system is used, i.e. equipment that applies accurate voltage, load current and load angle to the unit being calibrated, while measuring the response from the unit being calibrated in a repeatable way. By repeatable we mean that the calibration system is synchronized to the meter being calibrated. Best results are achieved when the first pulse from the meter opens the measurement window of the calibration system. This mode of operation is opposed to a calibrator that opens the measurement window at random time and that therefore may or may not catch certain pulses emitted by the meter.

It is essential for a valid meter calibration to have the voltage stabilized a few seconds before the current is applied. This enables the Demo Code to initialize the 71M6534/6534H and to stabilize the PLLs and filters in the CE. This method of operation is consistent with meter applications in the field as well as with metering standards.

Each meter p with either three or five measurements. The PHADJ equations apply only when a current transformer is used for the phase in question. Note that positive load angles correspond to lagging current (see Figure 2-2).

hase must be calibrated individually. The procedures below show how to calibrate a meter phase

During calibration of any phase, a stable mains voltage has to be present on phase A

. This enables the CE processing mechanism of the 71M6534/6534H necessar y to obtain a stable calibration.

Voltage

Current lags

voltage

(inductive

Positive direction

+60°

)

Current

-60°

Current leads

voltage

(capacitive

Using EnergyGenerating Energy

)

Voltage

Figure 2-2: Phase Angle Definitions

The calibration procedures desc acing the voltage and current sensors

ribed below should be followed after interf to the 71M6534/6534H chip. When properly interfaced, the V3P3 power supply is connected to the meter neutral and is the DC reference for each input. Each voltage and current waveform, as seen by the 71M6534/6534H, is scaled to be less than 250mV (peak).

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71M6534H Demo Board User’s Manual

2.2.1 CALIBRATION PROCEDURE WITH THREE MEASUREMENTS

The calibration procedure is as follows:

1) All calibration factors are reset to their default values, i.e. CAL_IA = CAL_VA = 16384, and PHADJ_A = 0.

2) An RMS voltage V

of the meter is recorded. The voltage reading error Axv is determined as

actual

Axv = (V

actual - Videal

3) Apply the nominal load current at phase angles 0° and 60°, measure the Wh energy and record the errors E

AND E60.

4) Calculate the new calibration factors CAL_IA, CAL_VA, and PHADJ_A, using the formulae presented in section 2.1.1 or using the spreadsheet presented in section 2.2.5.

5) Apply the new calibration factors CAL_IA, CAL_VA, and PHADJ_A to the meter. The memory locations for these factors are given in section 1.9.1.

6) Test the meter at nominal current and, if desired, at lower and higher currents and various phase angles to confirm the desired accuracy.

7) Store the new calibration factors CAL_IA, CAL_VA, and PHADJ_A in the flash memory of the meter. If the calibration is performed on a TERIDIAN Demo Board, the methods shown in sections 1.9.3 and

1.9.4 can be used.

8) Repeat the steps 1 through 7 for each phase.

9) For added temperature compensation, read the value in CE RAM location 0x54 and write it to CE RAM location 0x11.This will automatically calculate the correction coefficients PPMC and PPMC2 from the nominal temperature entered in CE location 0x11 and from the characterization data contained in the on-chip fuses.

Tip: Step 2 and the energy measurement at 0° of step 3 can be combin ed into one step.

consistent with the meter’s nominal voltage is applied, and the RMS reading

ideal

) / V

ideal

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71M6534H Demo Board User’s Manual

2.2.2 CALIBRATION PROCEDURE WITH FIVE MEASUREMENTS

The calibration procedure is as follows:

1) All calibration factors are reset to their default values, i.e. CAL_IA = CAL_VA = 16384, and PHADJ_A = 0.

2) An RMS voltage V

of the meter is recorded. The voltage reading error Axv is determined as

actual

Axv = (V

actual - Videal

3) Apply the nominal load current at phase angles 0°, 60°, 180° and –60° (-300°). Measure the Wh energy each time and record the errors E

4) Calculate the new calibration factors CAL_IA, CAL_VA, and PHADJ_A, using the formulae presented in section 2.1.2 or using the spreadsheet presented in section 2.2.5.

5) Apply the new calibration factors CAL_IA, CAL_VA, and PHADJ_A to the meter. The memory locations for these factors are given in section 1.9.1.

6) Test the meter at nominal current and, if desired, at lower and higher currents and various phase angles to confirm the desired accuracy.

7) Store the new calibration factors CAL_IA, CAL_VA, and PHADJ_A in the flash memory of the meter. If a Demo Board is calibrated, the methods shown in sections 1.9.3 and 1.9.4 can be used.

8) Repeat the steps 1 through 7 for each phase.

9) For added temperature compensation, read the value in CE RAM location 0x54 and write it to CE RAM location 0x11. This will automatically calculate the correction coefficients PPMC and PPMC2 from the nominal temperature entered in CE location 0x11 and from the characterization data contained in the on-chip fuses.

Tip: Step 2 and the energy measurement at 0° of step 3 can be combin ed into one step.

consistent with the meter’s nominal voltage is applied, and the RMS reading

ideal

) / V

ideal

, E60, E

, and E

180

300

2.2.3 FAST CALIBRATION – AUTO-CALIBRATION

The fast calibration procedure is supported by the Demo Code when the Auto-Cal function is executed. This procedure requires the following steps:

1) Establish load voltage and current from the calibration system. The load angle must be exactly 0.00 degrees.

2) Enter the expected voltage and current using CLI commands. For example, to calibrate for 240V, 30A for two seconds, enter

3) Issue the CLI command

4) Wait the specified number of seconds.

Check the calibration factors established by the automatic procedure. libration factors established by the automatic procedure.

)F=2=+2400=+300.

CLB.

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2.2.4 CALIBRATION PROCEDURE FOR ROGOWSKI COIL SENSORS

Demo Code containing CE code that is compatible with Rogowski coils is available from TERIDIAN Semiconductor.

Rogowski coils generate a signal that is the derivative of the current. The CE code implemented in the Rogowski CE image digitally compensates for this effect and has the usual gain and phase calibration adjustments. Additionally, calibration adjustments are provided to eliminate voltage coupling from the sensor input.

Current sensors built from Rogowski coils have relatively high output impedance that is susceptible to capacitive coupling from the large voltages present in the meter. The most dominant coupling is usually capacitance between the primary of the coil and the coil’s output. This coupling adds a component proportional to the derivative of voltage to the sensor output. This effect is compensated by the voltage coupling calibration coefficients.

As with the CT procedure, the calibration procedure for Rogowski sensors uses the meter’s display to calibrate the voltage path and the pulse outputs to perform the remaining energy calibrations. The calibration procedure must be done to each phase separately, making sure that the pulse generator is driven by the accumulated real energy for just that phase. In other words, the pulse generator input should be set to WhA, WhB, or WhC, depending on the phase being calibrated.

In preparation of the calibration, all calibration parameters are set to their default values. VMAX and IMAX are set to reflect the system design parameters. WRATE and PUSE_SLOW, PULSE_FAST are adjusted to obtain

the desired Kh.

Step 1: Basic Calibration three measurement procedure (2.2.1) or the five measurement calibration procedure (2.2.2) described in the CT section. Perform the procedure at a current large enough that energy readings are immune from voltage coupling effects.

The one exception to the CT procedure is the equation for PHADJ—after the phase error, φs, has been calculated, use the PHADJ equation shown below. Note that the default value of PHADJ is not zero, but rather –3973.

: After making sure VFEED_A, VFEED_B, and VFEED_C are zero, perform either the

If voltage coupling at low currents is introducing unacceptable errors, perform step 2 below to select non-zero values for VFEED_A, VFEED_B, and VFEED_C.

Step 2: Voltage Cancellation: energy error. At this current, measure the errors E

VFEED −

PHADJPHADJ

Select a small current, I

−

1800

1786

−=

SPREVIOUS

VIEE

MAXRMS

RMSMAX

and E

VFEED

, where voltage coupling introduces at least 1.5%

RMS

to determine the coefficient VFEED .

180

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71M6534H Demo Board User’s Manual

2.2.5 CALIBRATION SPREADSHEETS

Calibration spreadsheets are available from TERIDIAN Semiconductor. They are also included in the CD-ROM shipped with any Demo Kit. Figure 2-3 shows the spreadsheet for three measurements. Figure 2-4 shows the spreadsheet for five measurements with three phases.

For CT and shunt calibration, data should be entered into the calibration spreadsheets as follows:

1. Calibration is performed one phase at a time.

2. Results from measurements are generally entered in the yellow fields. Intermediate results and

calibration factors will show in the green fields.

3. The line frequency used (50 or 60Hz is entered in the yellow field labeled AC frequency.

4. After the voltage measurement, measured (observed) and expected (actually applied) voltages are

entered in the yellow fields labeled “Expected Voltage” and “Measured Voltage”. The error for the voltage measurement will then show in the green field above the two voltage entries.

5. The relative error from the energy measurements at 0° and 60° are entered in the yellow fields labeled

“Energy reading at 0°” and “Energy reading at 60°”. The corresponding error, expressed as a fraction will then show in the two green fields to the right of the energy reading fields.

6. The spreadsheet will calculate the calibration factors CAL_IA, CAL_VA, and PHADJ_A from the

information entered so far and display them in the green fields in the column underneath the label “new”.

7. If the calibration was performed on a meter with non-default calibration factors, these factors can be

entered in the yellow fields in the column underneath the label “old”. For a meter with default calibration factors, the entries in the column underneath “old” should be at the default value (16384).

A spreadsheet is also available for Rogowski coil calibration (see Figure 2-5). Data entry is as follows:

1. All nominal values are entered in the fields of step one.

2. The applied voltage is entered in the yellow field labeled “Input Voltage Applied” of step 2. The entered value will automatically show in the green fields of the two other channels.

3. After measuring the voltages displayed by the meter, these are entered in the yellow fields labeled “Measured Voltage”. The spreadsheet will show the calculated calibration factors for voltage in the green fields labeled “CAL_Vx”.

4. The default values (-3973) for PHADJ_x are entered in the yellow fields of step 3. If the calibration factors for the current are not at default, their values are entered in the fields labeled “Old CAL_Ix”.

5. The errors of the energy measurements at 0°, 60°, -60°, and 180° are entered in the yellow fields labeled “% Error …”. The spreadsheet will then display phase error, the current calibration factor and the PHADJ_x factor in the green fields, one for each phase.

6. If a crosstalk measurement is necessary, it should be performed at a low current, where the effects of crosstalk are noticeable. First, if (old) values for VFEEDx exist in the meter, they are entered in the spreadsheet in the row labeled “Old VFEEDx”, one for each phase. If these factors are zero, “0” is entered for each phase.

7. Test current and test voltage are entered in the yellow fields labeled VRMS and IRMS.

8. The crosstalk measurement is now conducted at a low current with phase angles of 0° and 180°, and the percentage errors are entered in the yellow fields labeled “% error, 0 deg” and “% error, 180 deg”, one pair of values for each phase. The resulting VFEEDx factors are then displayed in the green fields labeled VFEEDx.

Page: 49 of 86

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71M6534H Demo Board User’s Manual

71M6511/71M6513/71M6515 Calibration Worksheet

Three Measurements

REV 4.2

10/25/2005

Author: WJH

AC frequency:

(click on yellow field to select from pull-down list)

PHASE A

[Hz]

%fraction

Enter values in yellow fields Results will show in green fields… Date:

old new

Energy reading at 0° 0 0 CAL_IA 16384 16384

Energy reading at +60° 0 0 CAL_VA 16384 16384

Voltage error at 0° 0 0 PHADJ_

Expected voltage 240 [V]

Measured voltage 240 [V]

PHASE B

%fraction

old

new

Positive

direction

Energy reading at 0° 10 0.1 CAL_IB 16384 16384

Energy reading at +60° 10 0.1 CAL_VB 16384 14895

Voltage error at 0° 10 0.1 PHADJ_B 0

Expected voltage 240 [V]

Measured voltage 264 [V]

PHASE C

%fraction

old

new

Energy reading at 0° -3.8 -0.038 CAL_IC 16384 16409

Energy reading at +60° -9 -0.09 CAL_VC 16384 17031

Voltage error at 0° -3.8 -0.038 PHADJ_C -5597 Readings: Enter 0 if the error is 0%,

Expected voltage 240 [V] enter -3 if meter runs 3% slow.

Measured voltage 230.88 [V]

Figure 2-3: Calibration Spreadsheet for Three Measurements

Using EnergyGenerating Energy

Current lags

voltage

(inductive

+60°

-60°

Current leads

voltage

(capacitive

Voltage

)

Current

)

Voltage

71M6511/71M6513/71M6515 Calibration Worksheet

Five Measurements

PI 0.019836389

AC frequency: 50

(click on yellow field to select from pull-down list)

PHASE A

%fraction

[Hz]

old new

Energy reading at 0° 2 0.02 CAL_IA 16384 16220

Energy reading at +60° 2.5 0.025 CAL_VA 16384 16222

Energy reading at -60° 1.5 0.015 PHADJ_A 371

Energy reading at 180° 2 0.02

Voltage error at 0° 1 0.01

Expected voltage [V] 240 242.4 Measured voltage [V]

PHASE B

%fraction

old new

Energy reading at 0° 2 0.02 CAL_IB 16384 16223

Energy reading at +60° 2 0.02 CAL_VB 16384 16222

Energy reading at -60° 2 0.02 PHADJ_B 0

Energy reading at 180° 2 0.02

Voltage error at 0° 1 0.01

Expected voltage [V] 240 242.4 Measured voltage [V]

PHASE C %fraction

old new

Energy reading at 0° 0 0 CAL_IC 16384 16384

Energy reading at +60° 0 0 CAL_VC 16384 16384

Energy reading at -60° 0 0 PHADJ_C 0 Readings: Enter 0 if the error is 0%,

Energy reading at 180° 0 0 enter +5 if meter runs 5% fast,

Voltage error at 0° 0 0 enter -3 if meter runs 3% slow.

Expected voltage [V] 240 240 Measured voltage [V]

Results will show in green fields…

Enter values in yellow fields!

Date:

Author: WJH

Positive direction

4.2

10/25/2005

Current lags

(inductive

+60°

-60°

Current leads

voltage

(capacitive

Using EnergyGenerating Energy

voltage

Voltage

)

Current

)

Voltage

Figure 2-4: Calibration Spreadsheet for Five Measurements

Page: 50 of 86

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71M6534H Demo Board User’s Manual

Calibration Procedure for Rogowski Coils

Enter values in yellow fields! Results will show in green fields…

Step 1: Enter Nominal Values:

Nominal CAL_V 16384 Resulting Nominal REV 4.3

Nominal CAL_I 16384 Values: X 6

PHADJ -3973 Kh (Wh) 0.440

WRATE 179

Calibration Frequency [Hz] 50

IMAX (incl. ISHUNT) 30.000

Step 2: VRMS Calibration: Phase

Step 3: Current Gain and Phase Calibration

Step 4: Crosstalk Calibration (Equalize Gain for 0° and 180°)

1. Rogowski coils have significant crosstalk from voltage to current. This contributes to gain and phase errors.

2. Therefore, before calibrating a Rogowski meter, a quick 0° load line should be run to determine at what current the crosstalk contributes at least 1% error.

3. Crosstalk calibration should be performed at this current or lower.

4. If crosstalk contributes an E0 error at current Ix, there will be a 0.1% error in E60 at 15*Ix.

VMAX 600

PULSE_FAST -1 1 1 50 32768

PULSE_SLOW -1 1 -1 60 -32768

NACC 2520

Enter old CAL_VA 16384 16384 16384

Input Voltage Applied 240 240 240

Measured Voltage 235.612 236.55 234.72

VRMS 240

IRMS 0.30

CAL_Vx 16689 16623 16753

Phase APhase B Phase C

old PHADJ -3973 -3973 -3973

Old CAL_Ix 16384 16384 16384

%Error, 60° -3.712 -3.912 -5.169

%Error, -60° -3.381 -2.915 -4.241

%Error, 0° -3.591 -3.482 -4.751

%Error, 180° -3.72 -3.56 -4.831

Phase Error (°) 0.0547319 0.1647659 0.1533716

PHADJ -4070.74 -4267.22 -4246.88 CAL_Ix 17005.641 16981.934 17208.457

Phase

Old VFEEDx 0 0 0

% Error, 0deg 1.542 1.61 1.706

%Error, 180deg -1.634 -1.743 -1.884

VFEEDx -13321 -14064 -15058

Angle Sensitivity (deg/LSB)

50Hz 5.60E-04

Phase B Phase C

Deg/ct 5.60E-04

Phase B Phase C

Date:

Author: WJH

11/18/2005

Figure 2-5: Calibration Spreadsheet for Rogowski coil

Page: 51 of 86

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71M6534H Demo Board User’s Manual

2.2.6 COMPENSATING FOR NON-LINEARITIES

Nonlinearity is most noticeable at low currents, as shown in Figure 2-6, and can result from input noise and truncation. Nonlinearities can be eliminated individually for each channel by using the QUANT_n variables

(QUANT_A, QUANT_B, QUANT_C).

error [%]

0.1 1 10 100

I [A]

Figure 2-6: Non-Linearity Caused by Quantification Noise

The error can be seen as the presence of a virtual constant noise current. Assuming a noise current of 10mA, this current hardly contributes any error at currents of 10A and above, whereas the same noise current becomes dominant at small measurement currents.

The value that should to be used for

nQUANT

−=

VMA

Where error = observed error at a given voltage (V) and current (I), VMAX = voltage scaling factor, as described in section 1.8.3, IMAX = current scaling factor, as described in section 1.8.3,

QUANT_n LSB value = 1.04173*10

LSB =

Example: Assuming an observed error in channel A as in Figure 2-6, we determine the error at 1A to be +1%. If VMAX is 600V and IMAX = 208A, and if the measurement was taken at 240V, we determine QUANT_A as follows:

QUANT_n can be determined by the following formula:

error

100

⋅

⋅⋅

LSBIMA

error

-9

−=

AQUANT

QUANT_A is to be written to the CE location 0x26 (see the Data Sheet). It does not matter which current value

is chosen as long as the corresponding error value is significant (5% error at 0.2A used in the above equation

will produce the same result for QUANT_A).

Input noise and truncation can cause similar errors in the VAR calculation that can be eliminated using the

QUANT_VARn variables. QUANT_VARn is determined using the same formula as QUANT_n.

Page: 52 of 86

100

1240

⋅

−=

−

1004173.1208600

⋅⋅⋅

042,846,1

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71M6534H Demo Board User’s Manual

2.3 CALIBRATING AND COMPENSATING THE RTC

The real-time clock (RTC) of the 71M6534 is controlled by the crystal oscillator and thus only as accurate as the oscillator. The 71M6534 has two rate adjustment mechanisms:

• Analog rate adjustment, using the I/O RAM register RTCA_ADJ[6:0]. This adjustment is used to set the oscillator frequency at room temperature close to the target (ideal) value. Adjusting RTCA_ADJ[6:0] will change the time base used for energy measurements and thus slightly influence these energy measurements. Therefore it is recommended to adjust the RTC before

• Digital rate adjustment is used to dynamically correct the oscillator rate under MPU control. This is necessary when the IC is at temperatures other than room temperature to correct for frequency deviations.

The analog rate adjustment Setting RTCA_ADJ[6:0] to 00 minimizes the load capacitance, maximizing the oscillator frequency. Setting RTCA_ADJ[6:0] to 3F maximizes the load capacitance, minimizing the oscillator frequency.

The maximum adjustment is approximately ±60ppm. The precise amount of adjustment will depend on the crystal and on the PCB properties. The adjustment may occur at any time, and the resulting clock frequency can be measured over a one-second interval using a frequency counter connected to the TMUXOUT pin, while

0x10 or 0x11 is selected for the I/O RAM register TMUX[4:0]. Selecting 0x10 will generate a 1-second output;

selecting 0x11 will generate a 4-second output. The 4-second output is useful to adjust the oscillator at high

accuracy. It is also possible to set TMUX[4:0] to 0x1D to generate a 32.768kHz output. The adjustment of the oscillator frequency using RTCA_ADJ[6:0] at room temperature will cause the 71M6534

IC to maintain the adjusted frequency

uses the I/O RAM register RTCA_ADJ[6:0], which trims the crystal load capacitance.

calibrating a meter.

The digital rate adjustment clock rate is adjusted by writing the appropriate values to PREG[16:0] and QREG[1:0]. The default frequency is 32,768 RTCLK cycles per second. To shift the clock frequency by Δ ppm, calculate PREG and QREG using the following equation:

PREG and QREG form a single adjustment register with QREG providing the two LSBs. The default values of PREG and QREG, corresponding to zero adjustment, are 0x10000 and 0x0, respectively. Setting both PREG and QREG to zero is illegal and disturbs the function of the RTC.

If the crystal temperature coefficient is known, the MPU can integrate temperature and correct the RTC time as necessary, using PREG[16:0] and QREG[1:0].

The Demo Code adjusts the oscillator clock frequency using the parameters which can be obtained by characterizing the crystal over temperature. Provided the IC substrate temperature tracks the crystal temperature, the Demo Code adjusts the oscillator within very narrow limits.

The MPU Demo Code supplied with the TERIDIAN Demo Kits has a direct interface for these coefficients and it directly controls the PREG[16:0] and QREG[1:0] registers. The Demo Code uses the coefficients in the following form:

Note that the coefficients are scaled by 10, 100, and 1000 to provide more resolution.

Example: For a crystal, the deviations from nominal frequency are curve fitted to yield the coefficients a = 10.89, b = 0.122, and c = –0.00714. The coefficients for the Demo Code then become (after rounding, since the Demo Code accepts only integers):

can be used to adjust the clock rate up to ±988ppm, with a resolution of 3.8ppm. The

⋅

=+⋅

⎛

floorQREGPREG

⎜ ⎝

832768

−

⋅Δ+

101

⎞

5.0

⎟ ⎠

Y_CAL, Y_CAL1 and Y_CAL2,

ppmCORRECTION ⋅+⋅+=

)(

CALY

CALCY

100

CALCY

1000

Page: 53 of 86

Y_CAL = -109, Y_CALC = 12, Y_CALC2 = 7

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71M6534H Demo Board User’s Manual

2.4 SCHEMATIC INFORMATION

In this section, hints on proper schematic design are provided that will help designing circuits that are functional and sufficiently immune to EMI (electromagnetic interference).

2.4.1 COMPONENTS FOR THE V1 PIN

The V1 pin of the 71M6534/6534H can never be left unconnected.

A voltage divider should be used to establish that V1 is in a safe range when the meter is in mission mode (V1 must be lower than 2.9V in all cases in order to keep the hardware watchdog timer enabled). Pulling ICE_E up to V3P3 automatically disables the hardware watchdog timer.

V3P3

GND

Figure 2-7: Voltage Divider for V1

On the 6534 Demo Boards this feature is implemented with resistors R83/R86/R105 and capacitor C21. See the board schematics in the Appendix for details.

5kΩ

100pF

2.4.2 RESET CIRCUIT

Even though a functional meter will not necessarily need a reset switch, the 71M6534 Demo Boards provide a reset pushbutton that can be used when prototyping and debugging software (see Figure 2-8). R1 and C1 are mounted very close to the 71M6534. In severe EMI environments R2 can be removed, if the trace from the pushbutton switch to the RESETZ pin poses a problem,

For production meters, the RESET pin should be directly connected to GND.

VBAT/

V3P3D

71M6534

V3P3D

Reset

Switch

10Ω

1nF

V3P3D

100Ω

RESET

DGND

Figure 2-8: External Components for RESET

Page: 54 of 86

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71M6534H Demo Board User’s Manual

2.4.3 OSCILLATOR

The oscillator of the 71M6534 drives a standard 32.768kHz watch crystal (see Figure 2-9). Crystals of this type are accurate and do not require a high current oscillator circuit. The oscillator in the 71M6534 has been designed specifically to handle watch crystals and is compatible with their high impedance and limited power handling capability. The oscillator power dissipation is very low to maximize the lifetime of any battery backup device attached to the VBAT pin.

71M653X

33pF

7pF

It is not necessary to place an external resistor across the crystal.

crystal

Figure 2-9: Oscillator Circuit

XIN

XOUT

2.4.4 EEPROM

EEPROMs should be connected to the pins DIO4 and DIO5 (see Figure 2-10). These pins can be switched from regular DIO to implement an I2C interface by setting the I/O RAM register DIO_EEX (0x2008[4]) to 1. Pullup resistors of 10kΩ must be provided for both the SCL and SDA signals.

10kΩ

71M653X

DIO4

DIO5

Figure 2-10: EEPROM Circuit

10kΩ

EEPROM

SCL

SDA

V3P3D

Page: 55 of 86

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71M6534H Demo Board User’s Manual

2.4.5 LCD

The 71M6534 has an on-chip LCD controller capable of controlling static or multiplexed LCDs. Figure 2-11 shows the basic connection for LCDs. Note that the LCD module itself has no power connection.

71M653X

LCD

segments

commons

Figure 2-11: LCD Connections

2.4.6 OPTICAL INTERFACE

The 71M6534 IC is equipped with two pins supporting the optical interface: OPT_TX and OPT_RX. The OPT_TX pin can be used to drive a visual or IR light LED with up to 20mA, a series resistor (R helps limiting the current). The OPT_RX pin can be connected to the collector of a photo-transistor, as shown in Figure 2-12.

in Figure 2-12)

Phototransistor

V3P3SYS

LED

71M653X

OPT_RX

OPT_TX

100pF

100kΩ

Figure 2-12: Optical Interface Block Diagram

Page: 56 of 86

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71M6534H Demo Board User’s Manual

2.5 TESTING THE DEMO BOARD

This section will explain how the 71M6534/6534H IC and the peripherals can be tested. Hints given in this section will help evaluating the features of the Demo Board and understanding the IC and its peripherals.

2.5.1 FUNCTIONAL METER TEST

This is the test that every Demo Board has to pass before being integrated into a Demo Kit. Before going into the functional meter test, the Demo Board has already passed a series of bench-top tests, but the functional meter test is the first test that applies realistic high voltages (and current signals from current transformers) to the Demo Board.

Figure 2-13 shows a meter connected to a typical calibration system. The calibrator supplies calibrated voltage and current signals to the meter. It should be noted that the current flows through the CT or CTs that are not part of the Demo Board. The Demo Board rather receives the voltage output signals from the CT. An optical pickup senses the pulses emitted by the meter and reports them to the calibrator. Some calibration systems have electrical pickups. The calibrator measures the time between the pulses and compares it to the expected time, based on the meter Kh and the applied power.

AC Voltage

Outputs

Calibrated

Current CT

Pulse

Counter

under

Test

Opt ica l Pick up

for Pulses

Meter

Calibrator

Figure 2-13: Meter with Calibration System

TERIDIAN Demo Boards are not calibrated prior to shipping. However, the Demo Board pulse outputs are tested and compared to the expected pulse output. Figure 2-14 shows the screen on the controlling PC for a typical Demo Board. The number in the red field under “As Found” represents the error measured for phase A, while the number in the red field under “As Left” represents the error measured for phase B. Both numbers are given in percent. This means that for the measured Demo Board, the sum of all errors resulting from tolerances of PCB components, CTs, and 71M6534/6534H tolerances was –2.8% and –3.8%, a range that can easily be compensated by calibration.

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71M6534H Demo Board User’s Manual

2.5.2 EEPROM

Testing the EEPROM provided on the Demo Board is straightforward and can be done using the serial command line interface (CLI) of the Demo Code.

To write a string of text characters to the EEPROM and read it back, we apply the following sequence of CLI commands:

>EEC1 Enables the EEPROM

>EESthis is a test

>EET80

Written to EEPROM address 00000080 74 68 69 73 20 69 73 20 61 ….

Response from Demo Code

>EER80.E

Read from EEPROM address 00000080 74 68 69 73 20 69 73 20 61 ….

Response from Demo Code

Figure 2-14: Calibration System Screen

Writes text to the buffer

Writes buffer to address 80

Reads text from the buffer

>EEC0

Page: 58 of 86

Disables the EEPROM

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71M6534H Demo Board User’s Manual

2.5.3 RTC

Testing the RTC inside the 71M6534/6534H IC is straightforward and can be done using the serial command line interface (CLI) of the Demo Code.

To set the RTC and check the time and date, we apply the following sequence of CLI commands:

>M10 LCD display to show calendar date

>RTD05.09.27.3

>M9

>RTT10.45.00

Sets the date to 9/27/2005 (Tuesday)

LCD display to show time of day

Sets the time to 10:45:00. AM/PM distinction: 1:22:33PM = 13:22:33

2.5.4 HARDWARE WATCHDOG TIMER (WDT)

The hardware WDT of the 71M6534/6534H is disabled when the voltage at the V1 pin is at 3.3V (V3P3). On the Demo Boards, this is done by plugging in a jumper at TP10 between the V1 and V3P3 pins.

Conversely, removing the jumper at TP10 will enable the WDT. When the WDT is enabled, typing “W” at the command line interface will cause the Demo Board to reset.

2.5.5 LCD

Various tests of the LCD interface can be performed with the Demo Board, using the serial command line interface (CLI):

Setting the LCD_EN register to 1 enables the display outputs.

LCD_EN

To access the LCD_EN register, we apply the following CLI commands:

>RI21$ Reads the hex value of register 0x2021

2021[5] R/W Enables the LCD display. When disabled, VLC2, VLC1, and

VLC0 are ground, as are the COM and SEG outputs.

>25

>RI21=5

>RI21=25

The LCD_CLK register determines the frequency at which the COM pins change states. A slower clock means

lower power consumption, but if the clock is too slow, visible flicker can occur. The default clock frequency for

the 71M6534/6534H Demo Boards is 150Hz (LCD_CLK = 01).

LCD_CLK[1:0]

To change the LCD clock frequency, we apply the following CLI commands:

Response from Demo Code indicating the bit 5 is set

Writes the hex value 0x05 to register 0x2021 causing the display to be switched off

Sets the LCD_EN register back to normal

2021[1:0] R/W Sets the LCD clock frequency, i.e. the frequency at which SEG

and COM pins change states.

>RI21$ Reads the hex value of register 0x2021

>25

Page: 59 of 86

Response from Demo Code indicating the bit 0 is set and bit 1 is cleared.

= 32,768Hz

00: f

/29, 01: fw/28, 10: fw/27, 11: fw/26

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71M6534H Demo Board User’s Manual

>RI21=24 Writes the hex value 0x24 to register 0x2021 clearing bit 0 – LCD flicker is visible now

>RI21=25

Writes the original value back to LCD_CLK

2.6 TERIDIAN APPLICATION NOTES

Please contact your local TERIDIAN sales representative for TERIDIAN Application Notes. Available application notes will be listed below in future editions of this document.

Page: 60 of 86

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71M6534H Demo Board User’s Manual

3 HARDWARE DESCRIPTION

3.1 D6534T14A2 BOARD DESCRIPTION: JUMPERS, SWITCHES AND TEST POINTS

The items described in the following table refer to the flags in Figure 3-1.

Table 3-1: D6534T14A2 Demo Board Description

Item #

3 J4, J6, J8,

4 JP1 PS_SEL[0]

5 J9 Neutral

6 J12

7 J1 -- Plug for connecting the external 5 VDC power supply

8 JP8 VBAT

Reference

Designator

TP2 VA/V3P3

TP4 VB/V3P3

TP6 VC/V3P3

SW2 RESET

SW3 PB

Name Description

VA_IN, VB_IN,

VC_IN

OPT_RX,

OPT_TX_OUT

Two-pin header test points. One pin is either the VA, VB or VC line voltage input to the IC and the other pin is V3P3A.

Chip reset switch: When the button is pressed, the RESET pin is pulled high which resets the IC into a known state.

Multi-function pushbutton, used to wake-up the 71M6534 from sleep mode into brownout mode. In mission mode, this button functions to control the parameters displayed on the LCD.

VA_IN, VB_IN, and VC_IN are the line voltage inputs. Each point has a resistor divider that leads to the respective pin on the chip that is the voltage input to the A/D. These inputs connect to spade terminals located on the bottom of the board.

Caution: High Voltage! Do not touch these pins!

Two-pin header. When the jumper is installed the onboard power supply (AC signal) is used to power the demo board. When not installed, the board must be powered by an external DC supply connected to J1.

installed.

The neutral wire connect to the spade terminal located on the bottom of the board.

5-pin header for access to the optical interface (UART1).

For better EMI performance, jumpers should be installed from both OPT_RX and OPT_TX_OUT to V3P3D.

Three-pin header that allows the connection of a battery. If no battery is connected to the VBAT pin, a jumper should be placed between pins 1 and 2

Demo Board)

terminals 2 (+) and 3 (-).

. A battery can be connected between

Normally

(default setting of the

Page: 61 of 86

V2-0

Page 62

71M6534H Demo Board User’s Manual

Item #

Reference

Designator

Name Description

3-pin header for selecting the output driving the VARh

9 JP20 --

pulse LED. 1-2: RPULSE, 2-3: YPULSE. A jumper is normally installed from pin 1 to pin 2.

10 TP13 GND GND test point.

11 D6 VARS LED for VARh pulses

2-pin header enabling access to the selected pulse output (DIO8, DIO6, OPT_TX) and V3P3.

2-pin header enabling access to the selected pulse output (DIO7, DIO9) and V3P3.

TP20

TP21

3-pin header for selecting the output driving the Wh pulse

13 JP19 SEG28/ DIO08

LED. 1-2: WPULSE or OPT_TX, 2-3: XPULSE. A ju mper is normally installed from pin 1 to pin 2.

14 D5 WATTS LED for Wh pulses

15 TP15 GND GND test point.

3-pin header for selection of the firmware function in battery mode. Plugging a jumper across pins 2 and 3 will

16 JP16 BAT MODE

select 9600bd and will also disable the battery modes. Plugging a jumper across pins 1 and 2 will select 300bd and enable battery modes.

17 JP6 DIO3_R 3-pin header allowing access to the DIO03 pin.

18 TP16 GND GND test point.

3-pin header for selection of the voltage for the ICE_E pin.

19 JP7 ICE_EN

A jumper is normally installed between V3P3D and ICE_E, enabling programming of the 71M6534.

JP13, JP14,

JP15

DIO56, DIO57,

DIO58

2-pin headers providing access to the DIO pins DIO56, DIO57, and DIO58.

21 U8 -- LCD with eight digits and 14 segments per digit.

22 J2 DEBUG 8X2 header providing access for the Debug Board.

23 -- -- The 71M6534 IC in LQFP-120 package.

24 TP8

CKTEST,

TMUXOUT

25 J18 SPI Interface

2-pin header providing access to the TMUXOUT and CKTEST signals.

2X5 header providing access to the SPI interface of the 71M6534.

26 TP14 GND GND test point.

3-pin header used to enable or disable the hardware

27 TP10 V1_R

watchdog timer (WDT). The WDT is disabled by plugging as jumper between V1_R and V3P3 (default) and enabled by plugging as jumper between V1_R and GND.

28 J14 EMULATOR I/F

29 J17 --

2x10 high-density connector port for connecting the Signum ICE ADM-51 or the TFP-2 programmer.

6-pin header providing access to the essential signals of the emulator interface.

J19 IAN, IAP

J20 IBN, IBP

J21 ICN, ICP

2-pin headers providing access to the current input pins of channel A, B, C and D, used in differential mode.

J22 IDN, IDP

31 TP17 VREF

1-pin header providing access to the VREF pin.

Page: 62 of 86

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71M6534H Demo Board User’s Manual

Item # Name Description

Reference

Designator

J3 IAN_IN/IAP_IN

J5 IBN_IN/IBP_IN

J7 ICN_IN/ICP_IN

J10 IDN_IN/IDP_IN

2-pin headers mounted on the bottom of the board for connecting current transformers (CTs) to their associated current inputs.

Page: 63 of 86

Figure 3-1: D6534T14A2 Demo Board - Board Description

(Default jumper settings indicated in yellow)

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71M6534H Demo Board User’s Manual

3.2 BOARD HARDWARE SPECIFICATIONS

PCB Dimensions

• Diameter 6.5” (165.1mm)

• Thickness 0.062” (1.6mm)

• Height w/ components 2.0” (50.8mm)

Environmental

• Operating Temperature -40°…+85°C

• Storage Temperature -40°C…+100°C

Power Supply

• Using AC Input Signal 240V…700V rms

• DC Input Voltage (powered from DC supply) 5VDC ±0.5V

• Supply Current 25mA typical

Input Signal Range

• AC Voltage Signals (VA, VB, VC) 0…240V rms

• AC Current Signals (IA, IB, IC) from CT 0…0.25V p/p

Interface Connectors

• DC Supply Jack (J1) to Wall Transformer Concentric connector, 2.5mm

• Emulator (J14) 10x2 Header, 0.05” pitch

• Input Signals Spade Terminals and 0.1” headers on PCB bottom

• Debug Board (J2) 8x2 Header, 0.1” pitch

Functional Specification

• Program Memory 256KByte FLASH memory

• NV memory 1Mbit serial EEPROM

• Time Base Frequency 32.768kHz, ±20PPM at 25°C

• Time Base Temperature Coefficient -0.04PPM/°C2 (max)

Controls and Displays

• Reset Button (SW2)

• Numeric Display 8-digit LCD, 14-segments per digit, 8mm character

height, 89.0 x 17.7mm view area

• “Watts” red LED (D5)

• “VARS” red LED (D6)

Measurement Range

• Voltage 120…700 V rms (resistor division ratio 1:3,398)

• Current 0…200A (1.7Ω burden resistor for 2,000:1 CT)

Page: 64 of 86

Page 65

71M6534H Demo Board User’s Manual

4 APPENDIX

This appendix includes the following documentation, tables and drawings:

D6534T14A2 Demo Board Description

• D6534T14A2 Demo Board Electrical Schematic

• D6534T14A2 Demo Board Bill of Materials

• D6534T14A2 Demo Board PCB layers (copper, silk screen, top and bottom side)

Debug Board Description

• Debug Board Electrical Schematic

• Debug Board Bill of Materials

• Debug Board PCB layers (copper, silk screen, top and bottom side)

71M6534H IC Description

• 71M6534H Pin Description

• 71M6534H Pin-out

Formulae for Fast Calibration

Page: 65 of 86

Page 66

71M6534H Demo Board User’s Manual

4.1 D6534T14A2 SCHEMATICS, PCB LAYOUT AND BOM

Ferrite Bead 600ohm

L15

VA_IN

NEUTRAL

C46 30nF, 1000VDC

RV1

VARISTOR

R141 100, 2W

POWER SUPPLY SELECTION TABLE

R100

100K

R102

100K

R139

1.5

JP1

PS_SEL[0]

SELECTION

ON BOARD SUPPLY

EXT 5Vdc SUPPLY THRU J1

EXT 5Vdc SUPPLY THRU DEBUG BOARD

JP14

GNDVBAT

JP15

GNDVBAT

0.47uF, 1000VDC

VA_IN

PS_SEL[0] (JP1)

OUT

DIO56 DIO58 GND GND GND GND

HEADER 8X2

DEBUG CONNECTOR

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

100, 2W

DIO57 VBAT CKTEST_T TMUXOUT_T UART_TX_T UART_RX

1N4736A

6.8V, 1W

1N4148

VBAT

5Vdc EXT SUPPLY

1 2 3

RAPC712

JP13

R101

100K

R10

R11

R12

GND

CKTEST

TMUXOUT

UART_TX

2200uF, 16V

10UF, 6.3V

130

8.06K

25.5K

TL431

10uF, 6.3V

Ferrite Bead 600ohm

0.1uF

C42 1000pF

68.1

TP8

1 2

= 1206 PACKAGE

OFF PAGE INPUTS

DIO56 DIO57 DIO58

CKTEST TMUXOUT UART_TX

NEUTRAL

OFF PAGE OUTPUTS

V3P3 GND

UART_RX

VA_IN

VBAT

Footing holes

JP4

2 3

Mount holes

V3P3

GND

J15

1 2 3

Mount holes

Page: 66 of 86

Title

71M6534-4L-DB Neutral Current Capable

Size Document Number Rev

D6534T14A2 2.0

Date: Sheet

13Wednesday, February 13, 2008

Figure 4-1: TERIDIAN D6534T14A2 Demo Board: Electrical Schematic 1/3

Page 67

71M6534H Demo Board User’s Manual

VB_IN

VC_IN

VB_IN

VC_IN

Ferrite Bead 600ohm

IAP_IN IAN_IN

GND

IBP_IN IBN_IN

GND

ICP_IN ICN_IN

GND

C73

IDP_IN

C71

C77

C75

Ferrite Bead 600ohm

L10

Ferrite Bead 600ohm

IAP_IN

1 2

IAN_IN

IA_IN

GND

Ferrite Bead 600ohm

L13

R32 750

Ferrite Bead 600ohm

L12

R52 750

GND

V3P3

C9 1000pF

V3P3

C11 1000pF

C44 NC

TP2

IBP_IN

IBN_IN

ICP_IN

ICN_IN

C47 NC

TP4

IDP_IN

VB_IN

VA_IN

R73

100, 2W

R15

220K

RV2 VARISTOR

R38

220K

NEUTRAL

R16

220K

R26

220K

R39

220K

R46

220K

R17

220K

R27

220K

R40

220K

R47

220K

R18

220K

R28

220K

R41

220K

R48

220K

R19

220K

R29

220K

R42

220K

R49

220K

R20

220K

R30

120K

R43

220K

R50

120K

R21

220K

R31

4.7K

V3P3

R44

220K

R51

4.7K

V3P3

IDP_IN

RV3 VARISTOR

R65

R58

R59

VC_IN

100, 2W

220K

R66

220K

R60

220K

R67

220K

R61

220K

R68

220K

R62

220K

R69

220K

R63

220K

R70

120K

R64

220K

R71

4.7K

V3P3

Ferrite Bead 600ohm

L11

R72 750

GND

V3P3

C13 1000pF

CURRENT CONNECTIONS

C48 NC

TP6

C82

1 2

IB_IN

NC C83

1 2

IC_IN

NC C84

J10

ID_IN

R131

C78

R140

V3P3

R132

C76 NC

R142

V3P3

R133

C74

R143

V3P3

R138

L19

C72

GND

R25

R24

3.4

R33

R34

3.4

***

R35

R36

3.4

R37

R45

3.4

= 1206 PACKAGE

750 R14

R81 10K

V3P3

R82 10K

R54 750

750 R22

R84 10K

V3P3

R85 10K

R55

R23 750

R87 10K

V3P3

R88 10K

R56

750 R53

1000pF

V3P3

IAP

1000pF

2 1

J19

2 1

J20

2 1

J21

2 1

J22

C14

IAN

IBP

C16

C10

IBN

750

ICP

C23

C12

ICN

750

IDP

C34

NEUTRAL

VOLTAGE CONNECTIONS

Page: 67 of 86

OFF PAGE

GND

NEUTRAL

C15 1000pF

INPUTS

GND

V3P3

VA_IN

OFF PAGE OUTPUTS

VA VB VC

IAP IBP ICP IDP

NEUTRAL

IAN IBN ICN

Title

71M6534-4L-DB Neutral Current Capable

Size Document Number Rev

D6534T3A2 2.0

Date: Sheet

23Wednesday, February 13, 2008

Figure 4-2: TERIDIAN D6534T14A2 Demo Board: Electrical Schematic 2/3

Page 68

71M6534H Demo Board User’s Manual

3 2 1

TP10

Note: Place C24, C25, Y1 close to IC (U5)

GND

VBAT

OPT_TX

OPT_RX

R107

10K

GND

Note: C53 and R107 should be close to the IC

GND

VBAT

1000pF

GND

R113

VBAT

100

R83 16.9K 1%

V3P3

GND

R86

20.0K 1%

GND

C24

33pF

C25

15pF

R79

OPT_TX_OUT

100

C53

100pF

A2 GND4SDA

SER EEPROM

SERIAL EEPROM

C70

BAT_MODE

GND

R106

100pF

GND

Note: Place C31, L14, C21 close to IC (U5)

32.768KHZ

XOUT

OPTICAL I/F

GND

VBAT

GND

VCC

SCL

R104

C21

XIN

10K

JP16

SW2

RESET

J12

1 2 3 4 5

OPT IF SW3

RESET

VBAT

1 2 3

CKTEST

C31 22pF

GND

C20

0.1uF

GND SEG24/DIO04

R105 10K

TP17

GND

C80

1000pF

R111

V3P3D

R110

GND

1000pF C37

VREF

0.1uF

C29

0.1uF

C18

R31K

TP1 TP

R108

RESET

SEG25/DIO05

SEG28/DIO08

C54

R78

1000pF

C45

C36

10uF

V3P3

R103

10K

GND

TP15 TP

GND

Note: Place C29, R78 close to IC (U5)

GND

VC VB VA

IDP ICN ICP IBN IBP IAN IAP

GND GND

OPT_RX GND XIN GND XOUT

E_RST

E_TCLK

GND

TP13 TP

TP16 TP

GND

R109

10K

GND

TP14 TP

GND

0.1uF C22

V2P5

C17

0.1uF

L16

C43

1000pF

GND

SEG56/DIO3687SEG57/DIO3788SEG58/DIO3889SEG59/DIO39

C28

0.1uF

GND

RESET

GNDD

UART_TX

GND

V2P5

RESET

PCLK

VBAT

V3P3D

UART_RX

VBAT

CKTEST

V3P3

GND

Ferrite Bead 600ohm

GNDD1SEG9/E_RXTX2DIO2/OPT_TX3TMUXOUT4SEG66/DIO465TX6SEG3/PCLK7V3P3D8SEG19/CKTEST9V3P3SYS10SEG4/PSDO11SEG5/PCSZ12SEG53/E_TBUS[3]13SEG52/E_TBUS[2]14SEG51/E_TBUS[1]15SEG51/E_TBUS[0]16SEG37/DIO1717SEG38/DIO18/MTX18DIO5619DIO5720DIO5821DIO322COM023COM124COM2

GND

E_RXTX

OPT_TX

TMUXOUT

GND

0.1uF

GNDA

V3P3A

VBIAS

IDN

IDP

ICN

100

ICP

101

IBN

102

IBP

103

IAN

104

IAP

105

VREF

106

107

108

109

DIO1/OPT_RX

110

GNDD

111

XIN

112

TEST

113

XOUT

114

115

SEG42/DIO22/MRX

116

SEG11/E_RST

117

SEG61/DIO41

118

SEG62/DIO42

119

SEG10/E_TCLK

120

SEG32/DIO12

121

SLUG

100pF

VBAT

C19

1000pF

UART_RX

C55

V3P3

C50

SEG31/DIO11

PSDO

C52

1uF

SEG30/DIO10

SEG30/DIO1079SEG31/DIO1180SEG48/DIO28

PCSZ

SEG29/DIO09

PULSE OUTPUT

V3P3

VBAT

1 2 3

JP8

V3P3

SEG26/DIO06

SEG27/DIO07

SEG39/DIO19

SEG40/DIO20

SEG41/DIO21

SEG28/DIO08

SEG39/DIO1974SEG40/DIO2075SEG41/DIO21

SEG28/DIO8/XPULSE77SEG29/DIO9/YPULSE

SEG27/DIO7/RPULSE

71M6534H-120TQFP

DIO56

SEG37/DIO17

SEG38/DIO18

DIO03

C51

1000pF

GND

SEG25/DIO05

SEG26/DIO6/WPULSE

DIO57

SEG24/DIO04

SEG25/DIO5/SDATA

DIO58

SEG23

SEG24/DIO4/SDCK

DIO03

SEG22

COM0

R91

SEG20

SEG21

SEG2066SEG2167SEG2268SEG23

COM2

COM1

SEG17

SEG18

ICE_EN

SEG16

SEG43/DIO23

SEG1863SEG1762SEG16

ICE_EN

SEG43/DIO23

SEG75/DIO55 SEG74/DIO54 SEG73/DIO53 SEG72/DIO52 SEG71/DIO51

SEG44/DIO24

SEG33/DIO13 SEG45/DIO25 SEG46/DIO26 SEG47/DIO27 SEG63/DIO43

SEG65/DIO45

SEG7/MUX_SYNC

SEG50/DIO30

SEG36/DIO16 SEG49/DIO29 SEG64/DIO44 SEG35/DIO15 SEG34/DIO14

SEG55/E_ISYNC

COM326SEG67/DIO4727SEG68/DIO4828SEG69/DIO4929SEG70/DIO50

COM3

VBAT

GND

TP20

R74

10K

TP21

R76

10K

SEG6/PSDI

SEG28/DIO08

SEG15 SEG14 SEG13

SEG12

GNDD

SEG08

SEG02 SEG01 SEG00

C791000pF

JP6

1 2 3

HEADER 3

SEG27/DIO07

SEG29/DIO09

ICE_EN

60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31

GND

JP19

3 2 1

R75

R77

C49

1000pF

SEG15 SEG14 SEG13

SEG12 SEG33/DIO13

SEG63/DIO43

GND

SEG65/DIO45

SEG08 SEG07

PSDI SEG36/DIO16 SEG49/DIO29 SEG64/DIO44 SEG35/DIO15 SEG34/DIO14

SEG02

SEG01

SEG00

OFF PAGE INPUTS

V3P3 GND

VBAT

SEG26/DIO06

OPT_TX

JP20

1 2 3

UART_RX

VA VB VC

IAP IBP ICP IDP

Figure 4-3: TERIDIAN D6534T14A2 Demo Board: Electrical Schematic 3/3

GND

VBAT

E_RXTX

E_TCLK

E_RST

JP7

1 2 3

ICE_EN

C30

22pF

IAN IBN ICN

COM3 SEG31/DIO11 SEG30/DIO10 SEG41/DIO21 SEG40/DIO20 SEG39/DIO19 SEG23 SEG22 SEG21

SEG64/DIO44 SEG35/DIO15 SEG34/DIO14 SEG02 SEG01 SEG00 SEG38/DIO18 SEG37/DIO17

COM2

22pF

GND

OFF PAGE OUTPUTS

1 2 3 4 5 6 7 8 9

10 11 12 13 14 15 16 17 18

C61

C64

22pF

GND

UART_TX

DIO56

Title

DIO57 DIO58

Size Document Number Rev

TMUXOUT

CKTEST

Date: Sheet

LCD

COM3

-,1F,1E,1D 3

-,2F,2E,2D 5

-,3F,3E,3D 7

-,4F,4E,4D 9

-,5F,5E,5D 11

-,6F,6E,6D 13

-,7F,7E,7D 15

-,8F,8E,8D 17 COM2

C62

22pF

R97 62

R98 62

R99 62

71M6534-4L-DB Neutral Current Capable

D6534T3A2 2.0

22pF

C63

1A,1B,1C,1DP

2A,2B,2C,2DP

3A,3B,3C,3DP

4A,4B,4C,4DP

5A,5B,5C,5DP

6A,6B,6C,6DP

7A,7B,7C,7DP

8A,8B,8C,8DP

VBAT

RXTX TCLK RST_EMUL

C26 NC

U8VIM-828-DP

COM1

34 33

32 31

30 29

26 25

24 23

22 21

20 19

COM0

PSDI PSDO PCLK PCSZ VBAT

J18

1 2 3 4 5 6 7 8 9 10

C81

1000pF

SPI Interface

Note: Populate J14 or J17 but not both.

J14

HEADER 10X2

EMULATOR I/F

C27 22pF

GND

C57

1000pF

1920 1718 1516 1314 1112

910 78 56 34 12

1000pF

C69

COM1

SEG43/DIO23

SEG33/DIO13 SEG63/DIO43 SEG65/DIO45

SEG36/DIO16 SEG49/DIO29

VBAT RXTX TCLK RST_EMUL GND ICE_EN

SEG20

SEG18 SEG17 SEG16 SEG15 SEG14 SEG13

SEG12

SEG08 SEG07

COM0

GND

1 2 3 4 5 6

ICE Header

of33Thursday, February 14, 2008

GND

J17

Page: 68 of 86

Page 69

71M6534H Demo Board User’s Manual

CS-.327-12

Item Q Reference Part

1 1 C1 2200uF radial P5143-ND ECA-1CM222 Panasonic 2 3 C2,C4,C45 10uF RC1812 478-1672-1-ND TAJB106K010R AVX 3 8 C5,C17-C20,C22,C28,C29 0.1uF RC0603 445-1314-1-ND C1608X7R1H104K TDK 4 1 C6 0.47uF 5 33 C8-C16,C23,C33-C36,C40-C44, 1000pF RC0603 445-1298-1-ND C1608X7R2A102K TDK

6 11 C21,C32,C54,C71-C78 NC RC0603 7 1 C24 33pF RC0603 8 1 C25 7pF RC0603

9 13 C26,C27,C30,C31,C60-C68 22pF RC0603 10 1 C46 0.03uF axial 75-125LS30-R 125LS30-R Vishay 11 1 C52 1uF RC0603 PCC2224CT-ND ECJ-1VB1C105K Panasonic 12 2 C53,C55 100pF RC0603 13 1 D1 UCLAMP3301D SOD-323 -- UCLAMP3301D.TCT SEMTECH 14 1 D3 6.8V ZENER D041 1N4736ADICT-ND 1N4736A-T DIODES 15 1 D4 Switching Diode D035 1N4148DICT-ND 1N4148-T DIODES 16 2 D5,D6 LED radial 404-1104-ND H-3000L Stanley 17 1 D8 NC SOD-323 18 1 J1 DC jack (2.5mm) RAPC712 502-RAPC712X RAPC712X Switchcraft 19 1 J2 HEADER 8X2 8X2PIN S2011E-36-ND PZC36DAAN Sullins 20 J3,J5,J7,J10,J16 HEADER 2 2X1PIN S1011E-36-ND PZC36SAAN Sullins 21 4 J4,J6,J8,J9 Spade Terminal A24747CT-ND 62395-1 AMP 22 1 J12 HEADER 5 5X1PIN S1011E-36-ND PZC36SAAN Sullins 23 1 J13,J19-J22 HEADER 4 4X1PIN S1011E-36-ND PZC36SAAN Sullins 24 1 J14 10X2 CONNECTOR, 0.05" 571-5-104068-1 5-104068-1 AMP 25 1 J17 HEADER 6 6X1PIN S1011E-36-ND PZC36SAAN Sullins 26 1 J18 HEADER 5X2 5X2PIN S2011E-36-ND PZC36DAAN Sullins 27 6 JP1,JP13,JP14,JP15,JP17,JP18 HEADER 2 2X1PIN S1011E-36-ND PZC36SAAN Sullins 28 5 JP6,JP7,JP8,JP16,JP19,JP20 HEADER 3 3X1PIN S1011E-36-ND PZC36SAAN Sullins 29 1 JP12 HEADER 9 9X1PIN S1011E-36-ND PZC36SAAN Sullins 30 16 L1-L13,L15,L16,L19 Ferrite bead, 600 Ohm RC0805 445-1556-1-ND MMZ2012S601A TDK 31 3 RV1,RV2,RV3 VARISTOR radial 594-2381-594-55116 238159455116 Vishay 32 1 R2 8.06K, 1% RC0805 311-8.06KCRCT-ND RC0805FR-078060KL Yageo 33 1 R4 25.5K, 1% RC0805 311-25.5KCRCT-ND RC08052FR-072552L Yageo 34 4 R6,R65,R73,R141 100, 2W axial 100W -2-ND RSF200JB-100R Yageo 35 1 R7 130, 1% RC1206 311-130FRCT-ND RC1206FR-071300L Yageo 36 1 R9 68, 1% RC1206 311-68.0FRCT-ND RC1206FR-0768R0L Yageo 37 11 R10,R11,R12,R90,R92,R93, 62 RC0805 P62ACT-ND ERJ-6GEYJ620V Panasonic

38 12 R14,R22,R23,R32,R52-R57,R72, 750, 1% RC0805 P750CCT-ND ERJ-6ENF7500V Panasonic

39 33 R15-R21,R26-R29,R38-R44, 220K, 1% RC0805 311-220KCRCT-ND RC0805FR-07220KL Yageo

40 10 R24,R25,R33-R37,R45 3.4, 1% RC1206 311-3.40FRCT-ND RC1206FR-073R40L Yageo

41 3 R30,R50,R70 120K, 1% RC0805 311-120KCRCT-ND RC0805FR-071203L Yageo 42 3 R31,R51,R71 4.70K, 1% RC0805 311-4.70KCRCT-ND RC0805FR-074701L Yageo 43 9 R74,R76,R80,R103,R104,R105, 10K RC0805 P10KACT-ND ERJ-6GEYJ103V Panasonic

44 2 R75,R94 0 RC0805 P0.0ACT-ND ERJ-6GEY0R00V Panasonic 45 1 R77 NC RC0805 46 4 R78,R91,R108,R111 1K RC0805 P1.0KACT-ND ERJ-6GEYJ102V Panasonic 47 10 R79,R81,R82,R84,R85,R87,R88, 100 RC0805 P100ACT-ND ERJ-6GEYJ101J Panasonic

48 1 R83 16.9K, 1% RC0805 P16.9KCCT-ND 49 1 R86 20.0K, 1% RC0805 P20.0KCCT-ND ERJ-6ENF2002V Panasonic 50 3 R100,R101,R102 100K RC0805 P100KACT-ND ERJ-6GEYJ 104V Panasonic 51 8 R131,R132,R133,R134,R140, 0 RC1206 P0.0ECT-ND ERJ-8GEY0R00V Panasonic

52 1 R139 1.5 RC1206 P1.5ECT-ND 53 1 SW2,SW 3 SWITCH P8051SCT-ND EVQ-PJX05M Panasonic 54 8 TP2-TP4,TP6-TP8,TP20,TP21 TP 2X1PIN S1011E-36-ND PZC36SAAN Sullins 55 1 TP10 TP 3X1PIN S1011E-36-ND PZC36SAAN Sullins 56 4 TP13-TP16 Test Point 5011K-ND 5011 Keystone 1) 57 1 TP17 TP 1X1PIN S1011E-36-ND PZC36SAAN Sullins 58 5 U1,U2,U3,U7,U9 BAV99DW SOT363 BAV99DW-FDICT-ND BAV99DW-7-F DIODES 59 1 U4 SER EEPROM SO8 60 1 U5 71M6534 120TQFP -- 71M6534-IGT TERIDIAN 61 1 at U5 120TQFP Socket 120TQFP -- IC149-120-143-B5 Yamaichi

62 1 U6 REGULATOR, 1% SO8 296-1288-1-ND

63 1 U8 LCD 64 1 Y1 32.768kHz XC1195CT-ND

C47-C51,C56-C59,C69,C70,

C79,C80,C81

R95,R96,R97,R98,R99

R135

R46-R49,R58-R64,R66-R69

R136,R137

R106,R107,R109

R89, R110,R112

R142,R143,R144

PCB

Footprint

Digi-Key/Mouser Part

Number Part Number Manufacturer

B1918-ND

445-1275-1-ND C1608C0G1H330J 490-3564-1-ND GQM1885C1H7R0CB01D 445-1273-1-ND C1608C0G1H220J

445-1281-1-ND C1608C0G1H101J

AT24C256BN-10SU-1.8-ND AT24C256BN-10SU-1.8

153-1110-ND VIM-828-DP5.7-6-RC-S-LV

2222 383 30474

ERJ-6ENF1692V

ERJ-8GEYJ1R5V

TL431AIDR Texas Instruments

.5-17X-TR E

Vishay

TDK

Murata

TDK

Panasonic

ATMEL

VARITRONIX 2)

Table 4-1: D6534T14A2 Demo Board: Bill of Material

Page: 69 of 86

Page 70

71M6534H Demo Board User’s Manual

Page: 70 of 86

Figure 4-4: TERIDIAN D6534T14A2 Demo Board: Top View

Page 71

71M6534H Demo Board User’s Manual

Page: 71 of 86

Figure 4-5: TERIDIAN D6534T14A2 Demo Board: Top Copper Layer

Page 72

71M6534H Demo Board User’s Manual

Page: 72 of 86

Figure 4-6: TERIDIAN D6534T14A2 Demo Board: Bottom Copper Layer

Page 73

71M6534H Demo Board User’s Manual

Page: 73 of 86

Figure 4-7: TERIDIAN D6534T14A2 Demo Board: Ground Layer

Page 74

71M6534H Demo Board User’s Manual

Figure 4-8: TERIDIAN D6534T14A2 Demo Board: V3P3 Layer

Page: 74 of 86

Page 75

71M6534H Demo Board User’s Manual

Page: 75 of 86

Figure 4-9: TERIDIAN D6534T14A2 Demo Board: Bottom View

Page 76

71M6534H Demo Board User’s Manual

4.2 DEBUG BOARD DESCRIPTION

Item Q Reference

1 21 C1-C3,C5-C10,C12-C23 0.1uF 0805 C2012X7R1H104K TDK Digi-Key 445-1349-1-ND 2 1 C4 33uF/10V 1812 TAJB336K010R AVX Digi-Key 478-1687-1-ND 3 1 C11 10uF/16V, B Case 1812 TAJB106K016R AVX Digi-Key 478-1673-1-ND 4 2 D2,D3 LED 0805 LTST-C170KGKT LITEON Digi-Key 160-1414-1-ND 5 4 JP1,JP2,JP3,JP4 HDR2X1 2x1pin PZC36SAAN Sullins Digi-Key S1011-36-ND 6 1 J1 RAPC712 RAPC712 Switchcraft Digi-Key SC1152-ND 7 1 J2 DB9 DB9 A2100-ND AMP Digi-Key A2100-ND 8 1 J3 HEADER 8X2 8x2pin PPTC082LFBN Sullins Digi-Key S4208-ND

9 4 R1,R5,R7,R8 10K 0805 ERJ-6GEYJ103V Panasonic Digi-Key P10KACT-ND 10 2 R2,R3 1K 0805 ERJ-6GEYJ102V Panasonic Digi-Key P1.0KACT-ND 11 1 R4 NC 0805 N/A N/A N/A N/A 12 1 R6 0 0805 ERJ-6GEY0R00V Panasonic Digi-Key P0.0ACT-ND 13 1 SW2 PB Switch PB EVQ-PJX05M Panasonic Digi-Key P8051SCT-ND 14 2 TP5,TP6 test point TP 5011 Keystone Digi-Key 5011K-ND 15 5 U1,U2,U3,U5,U6 ADUM1100 SOIC8 ADUM1100AR ADI Digi-Key ADUM1100AR-ND 16 1 U4 MAX3237CAI SOG28 MAX3237CAI MAXIM Digi-Key MAX3237CAI-ND 17 4 spacer 2202K-ND Keystone Digi-Key 2202K-ND 18 4 4-40, 1/4" screw PMS4400-0025PH Building Fasteners Digi-Key H342-ND 19 2 4-40, 5/16" screw PMS4400-0031PH Building Fasteners Digi-Key H343-ND 20 2 4-40 nut HNZ440 Building Fasteners Digi-Key H216-ND

alue PCB Footprint P/N Manufacturer

endor

endor P/N

Table 4-2: Debug Board: Bill of Material

Page: 76 of 86

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71M6534H Demo Board User’s Manual

DB9_RS232

V5_DBG

0.1uF

DIO01

DIO00

GND_DBG

GND_DBG V5_DBG

0.1uF

GND_DBG

0.1uF

GND_DBG

LED

0.1uF

GND_DBG

LED

UART_RX_T

V5_DBG

GND_DBG

GND_DBG GND

V5_DBG

GND_DBG DIO00_DBG GND_DBG

DIO00 DIO02 GND GND GND GND GND_DBG V5_DBG

V5_DBG

10K

0.1uF

C14

C17

R4 NC

R5 10K

V5_DBG

0.1uF

GND_DBG

232VP1

232VN1

TX232

RX232

R7 10K

TP6

TP5

GND

C11 10uF, 16V (B Case)

R8 10K

VCC

C13

0.1uF

MAX3237CAI

C1+

C2+

T1IN T2IN T3IN T4IN T5IN

R1OUTBF

R1OUT R2OUT R3OUT

GND2MBAUD

GND_DBG

RS232 TRANSCEIVER

232C1P1

232C1M1

C1-

232C2P1

232C2M1

C2-

24 23 22 19 17

16 21 20 18

GND_DBG

TXISO

RXISO

C15

0.1uF

C18

0.1uF

C19

0.1uF

GND_DBG

C22

0.1uF

GND_DBG

C23

0.1uF

GND_DBG

V5_DBG

GND_DBG

V5_DBG

V5_DBG GND_DBG

VDD2

GND2

DOUT

GND2

ADUM1100

VDD1

DIN

VDD1 GND14GND2

ADUM1100

V5_DBG

V+

V-

T1OUT

T2OUT

T3OUT

T4OUT

T5OUT

R1IN

R2IN

R3IN

ENB

SHDNB

V5_DBG

VDD1

DIN

VDD1

GND1

VDD2

GND2

DOUT

5Vdc EXT SUPPLY

1 2 3

RAPC712

GND_DBG

5 9 4 8

RXPC

3 7

TXPC

2 6 1

JP1

HDR2X1

NORMAL

JP2

HDR2X1

NORMAL

JP3

HDR2X1

33uF, 10V

GND_DBG

NULL

JP4

HDR2X1

NULL

V5_DBG

SW2

DISPLAY SEL

GND_DBG

V5_DBG DIO01_DBG

V3P3 UART_TX V3P3 GND

V3P3 GND UART_RX GND

C16

0.1uF

C20

0.1uF

C21

0.1uF

R6 0

GND

VDD1

2 3

8 7 6 5

VDD2

DIN

GND2

VDD1

DOUT

GND14GND2

ADUM1100

VDD1

VDD2 GND2

VDD1

DOUT

GND1

GND2

ADUM1100

VDD1

VDD2 GND2

VDD1

DOUT

GND1

GND2

ADUM1100

DIN

STATUS LEDs

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

HEADER 8X2

DEBUG CONNECTOR

8 7 6 5

1 2 3 4

GND

V3P3 GND DIO02 GND

V3P3 DIO01 V3P3

V3P3 DIO00 V3P3 GND

0.1uF

C10

0.1uF

C12

0.1uF

DIO01 V3P3 CKTEST TMUXOUT UART_TX UART_RX_T GND_DBG V5_DBG

Page: 77 of 86

Figure 4-10: Debug Board: Electrical Schematic

Page 78

71M6534H Demo Board User’s Manual

Figure 4-11: Debug Board: Top View

Figure 4-12: Debug Board: Bottom View

Page: 78 of 86

Page 79

71M6534H Demo Board User’s Manual

Figure 4-13: Debug Board: Top Signal Layer

Page: 79 of 86

Figure 4-14: Debug Board: Middle Layer 1 (Ground Plane)

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71M6534H Demo Board User’s Manual

Figure 4-15: Debug Board: Middle Layer 2 (Supply Plane)

Page: 80 of 86

Figure 4-16: Debug Board: Bottom Trace Layer

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71M6534H Demo Board User’s Manual

4.3 71M6534H IC DESCRIPTION

Power/Ground Pins:

Name Type Description

GNDA P Analog ground: This pin should be connected directly to the ground plane.

GNDD P Digital ground: This pin should be connected directly to the ground plane.

V3P3A P

V3P3SYS P System 3.3V supply. This pin should be connected to a 3.3V power supply.

V3P3D O

VBAT P

V2P5 O

Analog Pins:

Analog power supply: A 3.3V power supply should be connected to this pin. It must be the same voltage as V3P3SYS.

Auxiliary voltage output of the chip, controlled by the internal 3.3V selection switch. In mission mode, this pin is internally connected to V3P3SYS. In BROWNOUT mode, it is internally connected to VBAT. This pin is floating in LCD and sleep mode.

Battery backup power supply. A battery or super-capacitor is to be connected between VBAT and GNDD. If no battery is used, connect VBAT to V3P3SYS.

Output of the internal 2.5V regulator. A 0.1µF capacitor to GNDA should be connected to this pin.

Name Type Description

IAP, IAN, IBP, IBN, ICP, ICN, IDP, IDN

VA, VB, VC

V1 I

V2, V3 I

VBIAS O Low impedance output for use in biasing current sensors and voltage dividers.

VREF O Voltage Reference for the ADC. This pin should be left open.

XIN XOUT

Pin types: P = Power, O = Output, I = Input, I/O = Input/Output

Differential or single-ended Line Current Sense Inputs: These pins are voltage inputs to the

internal A/D converter. Typically, they are connected to the outputs of current sensors. In singleended mode, the IXN pin should be tied to V3P3A.

Line Voltage Sense Inputs: These pins are voltage inputs to the internal A/D converter. Typically,

they are connected to the outputs of resistor dividers.

Comparator Input: This pin is a voltage input to the internal comparator. The voltage applied to the pin is compared to the internal VBIAS voltage (1.6V). If the input voltage is above VBIAS, the comparator output will be high (1). If the comparator output is low, a voltage fault will occur. A series 5kΩ resistor should be connected from V1 to the resistor divider.

Comparator Inputs: These pins are voltage inputs to internal comparators. The voltage applied to these pins is compared to the internal BIAS voltage of 1.6V. If the input voltage is above VBIAS, the comparator outputs will be high (1).

Crystal Inputs: A 32kHz crystal should be connected across these pins. Typically, a 33pF capacitor is also connected from XIN to GNDA and a 15pF capacitor is connected from XOUT to

GNDA. It is important to minimize the capacitance between these pins. See the crystal manufacturer datasheet for details.

Page: 81 of 86

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71M6534H Demo Board User’s Manual

Digital Pins:

Name Type Description

COM3, COM2, COM1, COM0

O LCD Common Outputs: These 4 pins provide the select signals for the LCD display.

SEG0…SEG2, SEG7, SEG8, SEG12…SEG18,

O Dedicated LCD Segment Output.

SEG20…SEG23

SEG24/DIO4 … SEG50/DIO30

SEG55/E_ ISYNC_BRKRQ

Multi-use pins, configurable as either LCD SEG driver or DIO. (DIO4 = SCK, DIO5 = SDA when configured as EEPROM interface, WPULSE = DIO6, VARPULSE = DIO7

I/O

when configured as pulse outputs)

I/O Multiuse pin, configurable as either LCD SEG driver or Emulator Handshake.

SEG54/E_TBUS3 SEG53/E_TBUS2 SEG52/E_TBUS1

I/O Multiuse pins, configurable as either LCD SEG driver or Emulator Trace Bus.

SEG51/E_TBUS0

SEG56/DIO36 …

I/O Multi-use pins, configurable as either LCD SEG driver or DIO.

SEG75/DIO55

SEG3/PCLK SEG4/PSDO SEG5/PCSZ

I/O Multi-use pins, configurable as either LCD SEG driver or SPI PORT.

SEG6/PSDI

DIO3, DIO56 DIO57, DIO58

I/O Dedicated DIO pins.

E_RXTX/SEG9 I/O

E_RST/SEG11 I/O

Multi-use pins, configurable as either emulator port pins (when ICE_E pulled high) or LCD SEG drivers (when ICE_E tied to GND).

E_TCLK/SEG10 O

ICE enable. When zero, E_RST, E_TCLK, and E_RXTX become SEG32, SEG33, and

ICE_E I

SEG38 respectively. For production units, this pin should be pulled to GND to disable the emulator port.

CKTEST/SEG19 O

Multi-use pin, configurable as either Clock PLL output or LCD segment driver. Can be

enabled and disabled by CKOUT_EN.

TMUXOUT O Digital output test multiplexer. Controlled by DMUX[3:0].

Multi-use pin, configurable as either Optical Receive Input or general DIO. When

OPT_RX/DIO1 I/O

configured as OPT_RX, this pin receives a signal from an external photo-detector used in an IR serial interface.

Multi-use pin, configurable as Optical LED Transmit Output, WPULSE, RPULSE, or

OPT_TX/DIO2 I/O

general DIO. When configured as OPT_TX, this pin is capable of directly driving an LED for transmitting data in an IR serial interface.

Chip reset: This input pin is used to reset the chip into a known state. For normal

RESET I

operation, this pin is pulled low. To reset the chip, this pin should be pulled high. This pin has an internal 30μA (nominal) current source pull-down. No external reset circuitry is necessary.

Page: 82 of 86

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71M6534H Demo Board User’s Manual

Digital Pins (Continued):

Name Type Description

RX I UART input.

TX O UART output.

TEST I Enables Production Test. Must be grounded in normal operation.

Push button input. Should be at GND when not active. A rising edge sets the IE_PB

PB I

flag. It also causes the part to wake up if it is in SLEEP or LCD mode. PB does not have an internal pull-up or pull-down.

Pin types: P = Power, O = Output, I = Input, I/O = Input/Output

10/

32/DI

SEG E_TCLK

SEG O12

62/DI

61/DI

SEG O42

SEG O

22/MRX

RST E_

11/

42/DI

SEG

XOUTTEXINGNDIO1 T_V1V2V3VREF

SEG O

/OP

IAN

IAP

IBP

IDP

IBN

IDN

ICP

ICN

VBIAS

V3P3A

GNDA

GNDD

SEG9/E_RXTX

DIO2/OPT_TX

TMUXOUT

SEG66/DIO46

SEG3/PCLK

V3P3D

SEG19/CKTEST

V3P3SYS

SEG4/PSDO

SEG5/PCSZ SEG54/E_TBUS3 SEG53/E_TBUS2 SEG52/E_TBUS1 SEG51/E_TBUS0

SEG37/DIO17

SEG38/DIO18/MTX

DIO56 DIO57 DIO58

DIO3 COM0 COM1 COM2 COM3

SEG67/DIO47 SEG68/DIO48 SEG69/DIO49 SEG70/DIO50

1 2 3 4 5 6

7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30

3132333435363738394041424344454647484950515253545556575859

Teridian

71M6534

SEG59/DIO39

SEG58/DIO38

SEG57/DIO37

SEG56/DIO36

GNDD

RESET

V2P5

VBAT

SEG48/DIO28

SEG31/DIO11

SEG30/DIO10

SEG29/DIO9/YPULSE

SEG28/DIO8/XPULSE

SEG41/DIO21

SEG40/DIO20

SEG39/DIO19

SEG27/DIO7/RPULSE

SEG26/DIO6/WPULSE

SEG25/DIO5/SDATA

SEG24/DIO4/SDCK

SEG23

SEG22

SEG21

SEG20

ICE_E

SEG43/DIO23

SEG18

SEG17

SEG16

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

Page: 83 of 86

SEG8

GNDD

SEG2/TEST2

SEG1/TEST1

SEG0/TEST0

SEG35/DIO15

SEG34/DIO14

SEG55/E_ISYNC

SEG6/PSDI

SEG64/DIO44

SEG50/DIO30

SEG36/DIO16

SEG49/DIO29

SEG63/DIO43

SEG65/DIO45

SEG33/DIO13

SEG45/DIO25

SEG47/DIO27

SEG46/DIO26

SEG7/MUX_SYNC

SEG12

SEG44/DIO24

SEG14

SEG13

SEG15

SEG71/DIO51

SEG72/DIO52

SEG73/DIO53

SEG74/DIO54

SEG75/DIO55

Figure 4-17: TERIDIAN 71M6534H epLQFP100: Pinout (top view)

Page 84

71M6534H Demo Board User’s Manual

4.4 FORMULAE FOR FAST CALIBRATION

A method for non-trigonometric derivation of the factors for the fast calibration is shown below.

The phase angle φ is calculated as follows:

VARh−

tan

VARh−

The value for tan(φ) can be used directly without calculating trigonometric values when

determining the values for

PHADJ

introduced in Calibration Theory section by substituting the constant parts of it with the variables a, b, and c:

measured

PHAD_n. We simplify the rather complex term for PHADJ_n

⎡

⎢ ⎣

[]

measured

[]

−−

929

−−−+

−−

−−−−

πφ

πφπ

⎤

)2cos()21(2)21(1)tan(

⎥

)2cos()21(1)tan()2sin()21(

TfTf

⎦

−−

929

⋅−−−+=

−

−=

−

−−=

Now we can calculate a, b, and c for 50Hz and for 60Hz, and then insert the values back into the original equation for

PHADJ, while at the same time writing 1048576 for 2

nPHADJ

1048576_

nPHADJ

1048576_

)2sin()21(

Tfb

)2cos()21(1

Tfc

VARh

02229.0

−

0131.01487.0

VARh

−

0155.0

−

09695.01241.0

measured

VARh

measured

VARh

−

)2cos()21(2)21(1

Tfa

measured

(for 60Hz metering)

(for 50Hz metering)

For the voltage, the ratio of the applied and measured RMS voltages determines the calibration factor:

Page: 84 of 86

VACAL 16384_ =

applied

measured

Page 85

71M6534H Demo Board User’s Manual

For the current calibration we have to realize that the meter's sig imaginary (VARh) parts of the energy. i_gain, the current gain, and rotated in the complex plane to eliminate phase error. Let φ be the phase adjust angle.

VARh

gainmeasured

trix:

applied

VVARh

⋅

gainmeasured

ϕϕ

A vector is rotated by multiplying by a 2x2 ma

cos(φ) -sin(φ)

sin(φ) cos(φ)

The linear adjustment vector is:

applied

is the real part of multiplying the rotation matrix by the linear adjustment vector.:

gain

= )sin()cos(

gain

The term after the + sign is negligible, since the applied reactive energy is near zero, so i

i⋅= )cos(

gain

VWh

⋅

gainmeasured

⋅

applied

VWh

nal is the vector sum of the real (Wh) and must be scaled to eliminate power errors

VARhWh

appliedapplied

VVARhVWh

⋅

gainmeasured

gain

becomes:

Furthermore,

=)cos(

VAh

measured

applied

which simplifies the equation for i

gain

VAh repeatability due to the signal processing performed in the 71M65XX chip.

The CE uses the value 16384 for unity gain. We can then substitute:

is easy to calculate from Wh

measured

16384

IACAL

gain

VVAh

⋅

gainmeasured

⋅

applied

VVAh

⋅

gainmeasured

measured

VARhWhVAh +=

and VARh

measuredmeasuredmeasured

, and it turns out to have good linearity and

measured

Page: 85 of 86

Page 86

71M6534H Demo Board User’s Manual

4.4.1

Revisio

REVISION HISTORY

n # Date Description

1.0 for D6534T14A1 board 10/16/2007 Document Creation

1.1 11/27/2008 Updated schematics and values used for capacitors at XIN/XOUT pins.

2.0 5/28/2008

Updated document to match board revision 2 (D6534T14A2): Schematics, BOM, board description, and layout.

User’s Manual: This User’s Manual contains proprietary product information of TERIDIAN Semiconductor Corporation (TSC) and is made available for informational purposes only. TERIDIAN assumes no obligation regarding future manufacture, unless agreed to in writin

Demo Kits and t time of order acknowledgment, including those pertaining to warranty, patent infringement and limitation of liability. TERIDIAN Semiconductor Corporation (TSC) reserves the right to make changes to this document at any time without notice. Accordingly, the reader is cautioned to verify the validity of schematics and firmware of designs based on this document. TSC assumes no liability for applications assistance.

Page: 86 of 86

heir contents are sold subject to the terms and conditions of sale supplied at the

TERIDIAN Semiconductor Corp., 6440 Oak Canyon Road, Suite 100,

TEL (714) 508-8800, FAX (714) 508-8877, http://www.teridian.com

Irvine, CA 92618-5201

Datasheet 71M6534H Datasheet (TERIDIAN Semiconductor)

Specifications and Main Features

Frequently Asked Questions

User Manual

1 GETTING STARTED

1.1 GENERAL

1.2 SAFETY AND ESD PRECAUTIONS

1.3 DEMO KIT CONTENTS

1.4 DEMO BOARD VERSIONS

1.5 COMPATIBILITY

1.6 SUGGESTED EQUIPMENT NOT INCLUDED

1.7 DEMO BOARD TEST SETUP

1.7.1 POWER SUPPLY SETUP

1.7.2 CABLE FOR SERIAL CONNECTION (DEBUG BOARD)

1.7.3 CHECKING OPERATION

1.7.4 SERIAL CONNECTION SETUP

1.8 USING THE DEMO BOARD

1.8.1 SERIAL COMMAND LANGUAGE

1.8.2 USING THE DEMO BOARD FOR ENERGY MEASUREMENTS

1.8.3 ADJUSTING THE KH FACTOR FOR THE DEMO BOARD

1.8.5 ADJUSTING THE DEMO BOARDS TO DIFFERENT VOLTAGE DIVIDERS

1.9 CALIBRATION PARAMETERS

1.9.1 GENERAL CALIBRATION PROCEDURE

1.9.2 CALIBRATION MACRO FILE

1.9.3 UPDATING THE 6534_DEMO.HEX FILE

1.9.4 UPDATING CALIBRATION DATA IN FLASH MEMORY WITHOUT USING THE ICE OR A PROGRAMMER

1.9.5 AUTOMATIC CALIBRATION (AUTO-CAL)

1.9.6 LOADING THE 6534_DEMO.HEX FILE INTO THE DEMO BOARD

1.9.7 THE PROGRAMMING INTERFACE OF THE 71M6534/6534H

1.10 DEMO CODE

1.10.1 DEMO CODE DESCRIPTION

1.10.2 IMPORTANT DEMO CODE MPU PARAMETERS

1.10.3 USEFUL CLI COMMANDS INVOLVING THE MPU AND CE

1.11 USING THE ICE (IN-CIRCUIT EMULATOR)

2 APPLICATION INFORMATION

2.1 CALIBRATION THEORY

2.1.1 CALIBRATION WITH THREE MEASUREMENTS

2.1.2 CALIBRATION WITH FIVE MEASUREMENTS

2.1.3 FAST CALIBRATION

2.2 CALIBRATION PROCEDURES

2.2.1 CALIBRATION PROCEDURE WITH THREE MEASUREMENTS

2.2.2 CALIBRATION PROCEDURE WITH FIVE MEASUREMENTS

2.2.3 FAST CALIBRATION – AUTO-CALIBRATION

2.2.4 CALIBRATION PROCEDURE FOR ROGOWSKI COIL SENSORS

2.2.5 CALIBRATION SPREADSHEETS

2.2.6 COMPENSATING FOR NON-LINEARITIES

2.3 CALIBRATING AND COMPENSATING THE RTC

2.4 SCHEMATIC INFORMATION

2.4.1 COMPONENTS FOR THE V1 PIN

2.4.2 RESET CIRCUIT

2.4.3 OSCILLATOR

2.4.4 EEPROM

2.4.5 LCD

2.4.6 OPTICAL INTERFACE

2.5 TESTING THE DEMO BOARD

2.5.1 FUNCTIONAL METER TEST

2.5.2 EEPROM

2.5.3 RTC

2.5.4 HARDWARE WATCHDOG TIMER (WDT)

2.5.5 LCD

2.6 TERIDIAN APPLICATION NOTES

3 HARDWARE DESCRIPTION

3.1 D6534T14A2 BOARD DESCRIPTION: JUMPERS, SWITCHES AND TEST POINTS

3.2 BOARD HARDWARE SPECIFICATIONS

4 APPENDIX

4.1 D6534T14A2 SCHEMATICS, PCB LAYOUT AND BOM

4.2 DEBUG BOARD DESCRIPTION

4.3 71M6534H IC DESCRIPTION

4.4 FORMULAE FOR FAST CALIBRATION

REVISION HISTORY