Cirrus Logic CDB5466U User Manual

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CDB5466U Evaluation Board

CDB5466U

Features

 Active Energy-to-Pulse Conversions

 Simple Configuration Jumpers

– Current Channel Gain
– High-pass Filter
– Energy-to-pulse Output Frequency

 Energy Pulses

– Collected by On-board Microcontroller
– Available on External Header
– Viewable via LEDs

 Multiple Supply Voltage Selections

 USB Communication with PC

 On-board Voltage Reference

General Description

The CS5466 is a low cost power/energy IC with pulse
output for power measurement solutions. The
CDB5466U Evaluation Board is an inexpensive tool
designed to evaluate the functionality and perfor­mance of the CS5466.

The evaluation board is designed to output energy-to­pulse conversions upon power-up. The CS5466 data
sheet should be read and consulted when using the
CDB5466U evaluation board.

The evaluation board includes a microcontroller with a
USB interface. The microcontroller and GUI (Graphi­cal User Interface) provide a means to quickly register
and evaluate the CS5466’s energy-to-pulse outputs.

ORDERING INFORMATION

CDB5466U Evaluation Board

VIN+

VIN-

IIN+

IIN-

REF+

+2.5 V

Reference

+5V

VIN+

VIN-

IIN+

IIN-

VREF SOURCE

4.096MHz

XIN

CS5466

VREFIN

VREFOUT

XOUT

IGAIN0
IGAIN1
FREQ0
FREQ1
FREQ2

E1
E2

FOUT

NEG

HPF

VD+ EXTGND

E1 E2 FOUT NEG

CONFIGURATION JUMPERS

Vu+ EXT

C8051F320

Microcontroller

USB

http://www.cirrus.com

Copyright © Cirrus Logic, Inc. 2005

(All Rights Reserved)

MAY ‘05

DS676DB1

1

CDB5466U

TABLE OF CONTENTS

LIST OF FIGURES .................................................................................................................... 2

LIST OF TABLES ...................................................................................................................... 2

1. HARDWARE ............................................................................................................................. 3

1.1 Introduction ........................................................................................................................ 3

1.2 Evaluation Board Overview ................................................................................................ 3

1.2.1 Analog Section ...................................................................................................... 4

1.2.2 Digital Section ....................................................................................................... 5

1.2.3 Power Supply Section ........................................................................................... 8

2. SOFTWARE .............................................................................................................................. 9

2.1 Installation Procedure ........................................................................................................ 9

2.2 Using the Software ............................................................................................................. 9

2.2.1 Start-Up Window ................................................................................................... 9

2.2.2 CS5466 Pulse Rate Output Window ................................................................... 11

3. SCHEMATICS ........................................................................................................................ 13

4. LAYOUT ................................................................................................................................. 18

LIST OF FIGURES

Figure 1. CDB5466U Assembly Drawing ........................................................................................ 3

Figure 2. CDB5466U Start-up Window ........................................................................................... 9

Figure 3. Alert Window .................................................................................................................. 10

Figure 4. Quit Window................................................................................................................... 10

Figure 5. CDB5466 Evaluation Board ........................................................................................... 11

Figure 6. CDB5466U Pulse Rate Output Window......................................................................... 11

Figure 7. Analog Inputs ................................................................................................................. 13

Figure 8. CS546x and Socket ....................................................................................................... 14

Figure 9. CS5462 and CS5466 Configuration............................................................................... 15

Figure 10. Microcontroller and USB Interface ............................................................................... 16

Figure 11. Power Supply ............................................................................................................... 17

Figure 1. Silk Screen ..................................................................................................................... 17

Figure 1. Topside Layer ................................................................................................................ 18

Figure 1. Bottomside Layer ........................................................................................................... 19

LIST OF TABLES

Table 1. Voltage Reference Selection for VREF ............................................................................. 4

Table 2. Voltage Reference Selection for VREF ............................................................................. 4

Table 3. Voltage and Current Channel Input Signal Selection ........................................................ 5

Table 4. Current Channel PGA Selection........................................................................................ 6

Table 5. HPF Option Selection........................................................................................................ 6

Table 6. Energy Output Frequency ................................................................................................. 7

Table 7. Power Supply Connections ...............................................................................................8

2 DS676DB1

CDB5466U

1. HARDWARE

1.1 Introduction

The CS5466 is a low cost power measurement solution combining two ∆Σ analog-to-digital converters (ADCs), an
energy-to-frequency converter, and energy pulse outputs on a single chip. It is designed to accurately measure and
calculate energy for single phase, 2- or 3-wire power metering applications with minimal external components.

Low-frequency energy outputs, E1

and E2 supply average active power and can be used to drive a stepper motor
or a mechanical counter; the high-frequency energy output FOUT is designed to assist in calibration; and NEG in­dicates negative energy.

The CS5466 has configuration pins which allow the selection of pulse output frequency, current channel input range,
and the high-pass filter enable option. The CS5466 also has a power-on reset function which holds the part in reset
until the supply reaches the proper level. The CDB5466U is shipped with a CS5466-ISZ device located at U6.

1.2 Evaluation Board Overview

The CDB5466U evaluation board provides a quick path to evaluating the CS5466 Power Measurement IC. Figure
1 illustrates the placement of the terminals, jumpers and IC components. The jumper options are shown in the fac­tory default positions.

TP1 TP2

TP4

TP5

RESET

JP5

GND

JTAG

S1

U3

USB

J1

TP3

8051

LED_EN

1

J10

LED_EN

1

J13

LED_EN

1

J15

LED_EN

1

J16

U5

CS5466 CONFIG

J2

TP6

E1

E2

FOUT

NEG

J32J31J30J29J28

IGAIN0IGAIN1FREQ0FREQ1FREQ2

FOUT

NEG

RESET

HPF

J11

E1
E2

EXT ENER REG

GND

JP4

GND

J33

VD+
FOUT
GND

REF+

GND

GND

VIN+

VIN-

GND

GND

IIN+

IIN-

GND

J14

J23

J27

Vu+_EXTVD+_EXTGND+5V

8051_REGIN

+5V
VD+

J9

J6

JP2

GND

J5J4J3

JP1

GND

GND

VD+

U4

JP3

GND

LT1019

JP6

GND

REF+

GND

VREF

VIN+
VIN-

VREF

GND

GND

VREF

IIN+

IIN-

VREF

GND

J12

J17

J26

J22

J24

VIN+

VIN-

IIN+

IIN-

TP9

TP11

TP12

TP13

CDB5466U REV X

U7

CPUCLK

TP10

J25

VA+

GND VD+GND

VD+_EXT

+5V

+3.3V

XOUT XIN

TP7 TP8

4.096MHz

VREF

VREFIN

VREFOUT

VD+

J8

5466

Vu+_EXT

Y1

Figure 1. CDB5466U Assembly Drawing

DS676DB1 3

CDB5466U

The CDB5466U evaluation board is partitioned into two main sections - analog and digital. The analog section con­sists of the CS5466 and a precision voltage reference that operates from a single +5 V power supply. The digital
section consists of the microcontroller, the reset circuitry, and the USB interface. The digital section can operate from
a +5 V or +3.3 V power supply. The evaluation board is epuipped with power supply connections that accommodate
all of the various supply options of the CS5466.

The evaluation board is designed to output energy-to-pulse conversions upon power-up. Software that runs on a PC
provides a GUI (Graphical User Interface) as a means to quickly register and evaluate the CS5466’s energy-to-pulse
outputs. To accomplish this, the board comes equipped with USB drivers and cable which physically interfaces the
evaluation board to the PC. The software provides easy access to the energy outputs E1
vides a means to display and evaluate the performance of the CS5466.

1.2.1 Analog Section

The CDB5466U evaluation board provides screw-type terminals (J23 and J27) to connect input signals to the volt­age and current channels. The screw terminals are labeled as VIN+, VIN-, IIN+, and IIN-. A simple R-C network at
each channel input provides a simple anti-alias filter.

The evaluation board provides three voltage reference options for VREFIN to the CS5466. The three voltage refer­ence options include: VREFOUT from the CS5466, the on-board +2.5 V reference, and external REF+ (screw ter­minal J14). Table 1 and Table 2 illustrate the options available for VREFIN. With a jumper on J25 in the position

, E2, and FOUT and pro-

Reference Description J25

VREFOUT

VREF

Selects on-Chip

Reference (25ppm/

°C)

Selects External or

LT1019 Reference(J12)

VREFIN

VREFOUT
(Default)

VREFIN

VREFOUT

VREF

O
O



O
O



VREF

Table 1. Internal Voltage Reference Selection for VREF

labeled VREFOUT, the reference is supplied by the on-chip voltage reference. With a jumper on J25 in the position
labeled VREF, the reference is supplied by an off-chip voltage reference.

Table 2 illustrates the options available for VREF. With a jumper on J12 in position LT1019, the LT1019 provides a

Reference Description J12

LT1019

REF+

Selects on-Board

LT1019 Reference

(5ppm/

°C)

Selects External

Reference Source

(J6)

LT1019

REF+

LT1019

REF+

 O VREF

O O VREF

 O VREF

O O VREF

(Default)

Table 2. External Voltage Reference Selection for VREF

+2.5 V reference (the LT1019 was chosen for its low drift - typically 5ppm/°C). By setting the jumper on J12 to posi­tion REF+, an external voltage reference is supplied via screw terminal J14’s REF+ input.

The three input signal options for the voltage (VIN±) and current (IIN±) channel input include: an external signal
(screw terminals J23 and J27), GND or VREF. Table 3 illustrates the options available. By installing jumpers on J17

4 DS676DB1

CDB5466U

to position VIN+, J22 to position VN-, J24 to position IIN+ and J26 to position IIN-, the input voltage signal is supplied
from the screw terminals J23 and J27. With a jumper on J17, J22, J24 and J26 in the GND position, the inputs are
connected to analog ground (AGND). With a jumper on J17, J22, J24 and J26 in position
nected to the reference voltage selected on J12.

INPUT Description J17 J22 J24 J26

VREF, the inputs are con-

VIN± or IIN±

VIN± or IIN±

GND

VREFIN

Selects External

Signal

Selects External

Signal

Selects Grounding

the Input

Selects Reference

Source

GND

VREF

VIN+

GND

VREF

VIN+

GND

VREF

VIN+

GND

VREF

VIN+



O VIN+
O O VIN+
O O VIN+

(Default)



O VIN+
O O VIN+
O O VIN+



O VIN+
O O VIN+
O O VIN+



O VIN+
O O VIN+
O O VIN+

VIN-

VREF

GND

VIN-

VREF

GND

VIN-

VREF

GND

VIN-

VREF

GND



O VIN-
O O VIN-
O O VIN-

(Default)



O VIN-
O O VIN-
O O VIN-



O VIN-
O O VIN-
O O VIN-



O VIN-

O O VIN-
O O VIN-

GND

VREF

IIN+

GND

VREF

IIN+

GND

VREF

IIN+

GND

VREF

IIN+



O IIN+
O O IIN+
O O IIN+

(Default)



O IIN+
O O IIN+
O O IIN+



O IIN+
O O IIN+
O O IIN+



O IIN+
O O IIN+
O O IIN+

IIN-

VREF

GND

IIN-

VREF

GND

IIN-

VREF

GND

IIN-

VREF

GND



O IIN-
O O IIN-
O O IIN-

(Default)



O IIN-
O O IIN-
O O IIN-



O IIN-
O O IIN-
O O IIN-



O IIN-
O O IIN-
O O IIN-

Table 3. Voltage and Current Channel Input Signal Selection

1.2.2 Digital Section

The digital section contains the microcontroller, USB interface, JTAG header, reset circuitry, and an external inter­face header (J11). The microcontroller interfaces the energy pulses, E1
the USB connection to the PC. The microcontroller also provides a hardware reset to the CS5466, which is level
shifted to support both +3.3 V and +5 V digital operation. Interface header, J11, is provided to allow the CDB5466U
to be connected to an external energy registration device. The energy output pins E1
to LEDs which provide a simple visual check of the energy output pulses. Jumpers J10, J13, J15 and J16 are
equipped at the factory with jumpers to enable the LEDs.

, E2, and FOUT output by the CS5466 with

, E2, FOUT and NEG are routed

1.2.2.1 Current Channel Gain

To accommodate different current-sensing elements the current channel incorporates a programmable gain that can
be set to one of four input ranges. Input pins IGAIN1 and IGAIN0 define the four gain selections and corresponding
maximum input signal level. Jumpers J31 and J32 define the state of IGAIN1 and IGAIN0, respectively. Table 4 il­lustrates the options available. With jumpers J31 = J32 = GND the gain is set to 10x. With jumpers J31 = GND and
J32 = VD+ the gain is set to 50x. With jumpers J31 = VD+ and J32 = GND the gain is set to 100x. With jumpers
J31 = VD+ and J32 = VD+ the gain is set to 150x.

DS676DB1 5

Maximum Input Range IGAIN1 IGAIN0

J31 J32

CDB5466U

±250mV 10x

±50mV 50x

±25mV 100x

±16.67mV 150x

VD+

IGAIN1

GND

(Default)

VD+

IGAIN1

GND

VD+

IGAIN1

GND

VD+

IGAIN1

GND



O
O



O
O



O
O



O
O

VD+

IGAIN0

GND

(Default)

VD+

IGAIN0

GND

VD+

IGAIN0

GND

VD+

IGAIN0

GND



O
O



O
O



O
O



O
O

Table 4. Current Channel PGA Selection

1.2.2.2 High-pass Filter

By removing the offset from either channel, no error component will be generated at DC when computing the active
(real) power. Input pin HPF defines the three options, and J33 defines the state of the HPF pin.

– HPF is enabled in the voltage channel when jumper J33 = GND.
– HPF is enabled in the current channel when pin HPF is connected to pin FOUT.
– High-Pass Filter (HPF) is disabled when jumper J33 = VD+.

HPF

High Pass Filter Option J33

Voltage

Channel

Current

Channel

Disabled

HPF Option

is in Voltage

Channel

HPF Option

is in Current

Channel

HPF Option

is Disabled

HPF

HPF

HPF

HPF

HPF

HPF

HPF

HPF

HPF

O O VD+
O O FOUT
O  GND

(Default)

O O VD+
O O FOUT
O  GND

O O VD+
O O FOUT
O  GND

Table 5. HPF Option Selection

1.2.2.3 Energy Pulse Outputs

The CS5466 provides three output pins for energy registration. The E1 and E2 pins provide a simple interface from
which energy can be registered. These pins are designed to directly connect to a stepper motor or electromechanical
counter. The E1
and E2 pins are in the range of 0 to 4 Hz and all frequency settings are optimized to be used with standard meter
constants. The FOUT pin is designated for system calibration, the pulse rate can be selected to reach a frequency
of 8000 Hz. The FOUT output is available on header J11, pin 5.

and E2 outputs are available on header J11, pins 1 and 3, respectively. The pulse rate on the E1

6 DS676DB1

CDB5466U

1.2.2.4 Selecting Frequency of E1 and E2

The pulse rate on E1 and E2 can be set to one of four frequency ranges. Input pins FREQ1 and FREQ0 determine
the maximum frequency on E1
the frequency of E1

with active-low alternating pulses. Table 6 illustrates the options available.

The maximum frequency on the E1
J30, if the maximum peak differential signal applied to both channels is a sine wave with zero phase shift.

Maximum Frequency for a Sine Wave Frequency Select

E1

or E2 E1+E2 FOUT J28 J29 J30

and E2 for sine wave inputs with zero phase shift. The frequency of E2 is equal to

and E2 output pins is determined by the position of the jumpers on J28, J29 and

FREQ2 FREQ1 FREQ0

0.125 Hz 0.25 Hz 64x(E1

0.25 Hz 0.5 Hz 32x(E1

0.5Hz 1.0 Hz 16x(E1

1.0 Hz 2.0 Hz 2048x(E1

0.125 Hz 0.25 Hz 128x(E1

0.25 Hz 0.5 Hz 64x(E1

0.5 Hz 1.0 Hz 32x(E1

+E2)16 Hz

VD+

FREQ2

GND

+E2)16 Hz

VD+

FREQ2

GND

+E2)16 Hz

VD+

FREQ2

GND

VD+

+E2) 4,096 Hz

FREQ2

GND

(Default)

+E2)32 Hz

VD+

FREQ2

GND

+E2)32 Hz

VD+

FREQ2

GND

+E2)32 Hz

VD+

FREQ2

GND

O



FREQ1

GND

VD+

O

O



FREQ1

GND

VD+

O

O



FREQ1

GND

VD+

O

O



FREQ1

GND

VD+

O

(Default)

O



FREQ1

GND

VD+

O

O



FREQ1

GND

VD+

O

O



FREQ1

GND

VD+

O

O
O



O
O



O
O



O
O



O
O



O
O



O
O



VD+

FREQ0

GND

VD+

FREQ0

GND

VD+

FREQ0

GND

VD+

FREQ0

GND

(Default)

VD+

FREQ0

GND

VD+

FREQ0

GND

VD+

FREQ0

GND

O
O



O
O



O
O



O
O



O
O



O
O



O
O



1.0 Hz 2.0 Hz 16x(E1

+E2)32 Hz

VD+

FREQ2

GND

O
O



VD+

FREQ1

GND

O
O



VD+

FREQ0

GND

O
O



Table 6. Energy Output Frequency

DS676DB1 7