Cirrus Logic CDB5464U User Manual

CDB5464U

CDB5464U Engineering Board and GUI Software

Features

 Voltage and Current Interface
 USB Communication with PC
 On-board C8051F320 Microcontroller
 On-board Voltage Reference
 LabWindows

– Register Setup & Chip Control
– FFT Analysis
– Time Domain Analysis
– Noise Histogram Analysis

 "Auto-boot" Demo with Serial EEPROM

®

/CVI® GUI Software

General Description

The CDB5464U is an inexpensive tool designed to evaluate
the functionality and performance of the CS5464 analog-to-dig­ital converter (ADC). The evaluation board includes an LT1019
voltage reference, a C8051F320 microcontroller with a USB in­terface, and firmware. The microcontroller controls the serial
communication between the evaluation board and the PC via
the firmware, enabling quick and easy access to all of
theCS5464's registers and functions.

The CDB5464U includes software for data capture, time do­main analysis, histogram analysis, and frequency domain
analysis.

Schematics in PADS™ PowerLogic™ format are available for
download at www.cirrus.com/IndustrialSoftware

ORDERING INFORMATION

CDB5464U Evaluation Board

.

REF

VIN+

VIN-

IIN1+

IIN1-

IIN2+

IIN2-

www.cirrus.com

+2.5V

reference

+5V GND

IN OUT

VREF

CS5464

4.096MHz
Crystal

Copyright © Cirrus Logic, Inc. 2007

VD+_EXT

SERIAL

EERPOM

CS

SDI

SDO

SCLK

INT

RESET

E1

E2

E3

MODE

(All Rights Reserved)

Vu+_EXT

C8051F320

Reset

Circuirty

RESET

BUTTON

USB

OCT ‘07

DS847DB1

CDB5464U

TABLE OF CONTENTS

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

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

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

1.3 Analog Section ........................................... .......................................... ... ...........................4

1.4 Digital Section ........ ... .... ... ... ... .... ... ... .......................................... ........................................ 5

1.5 Power Supply Section ... .......................................... ... ... ... .......................................... ... ..... 6

1.6 Auto-boot Mode ............................................ ... ... .... .......................................... ... ... ... ........7

2. SOFTWARE .............................................................................................................................. 8

2.1 Installation . ... .... ... ... ... .... ... .......................................... .......................................... ..............8

2.2 Using the Software ................................. .... ... .......................................... ........................... 8

2.3 Start-up Window .................................... .... ... ... ... .... .......................................... ... ... ... ........ 8

2.4 Setup Window ..................................................................................................................12

2.5 Calibration Windows ........................... ... .... ... ... ... .... ... ... .......................................... ... ... ...14

2.6 Conversion Window ......... ... ... .... ... ...................................................................................16

2.7 Pulse Rate Window ................................ .... .......................................... ............................17

2.8 Data Collection Window ................................................................................................... 19

2.9 EEPROM Window ............................................................................................................26

2.10 Debug Panel ..................................................................................................................27

Appendix A. Bill Of Materials .................................................................................................... 28

Appendix B. Schematics ........................................................................................................... 30

Appendix C. Layer Plots............................................................................................................ 34

LIST OF FIGURES

Figure 1. CDB5464U Assembly Drawing........................................................................................3

Figure 2. GUI Start-up Window .......................................................................................................8

Figure 3. Setup Menu Showing Successful USB Connection......................................................... 9

Figure 4. USB Error Message .........................................................................................................9

Figure 5. Data from Disc File Selection Window...........................................................................10

Figure 6. Menu Pull-down Options................................................................................................10

Figure 7. Quit Dialog .....................................................................................................................11

Figure 8. Setup Window................................................................................................................12

Figure 9. Calibration Window .......................................................................................................14

Figure 10. Conversion Window.....................................................................................................16

Figure 11. Pulse Rate Output Window..........................................................................................17

Figure 12. Data Collection Window...............................................................................................19

Figure 13. Configuration Window..................................................................................................20

Figure 14. Histogram Analysis ......................................................................................................22

Figure 15. FFT Analysis................................................................................................................24

Figure 16. Time Domain Analysis .................................................................................................25

Figure 17. EEPROM Window........................................................................................................26

Figure 18. Debug Panel ................................................................................................................ 27

Figure 19. Schematic - Analog Inputs ...........................................................................................30

Figure 20. Schematic - CS5464 & Socket.....................................................................................31

Figure 21. Schematic - Microcontroller & USB Interface...............................................................32

Figure 22. Schematic - Power Supplies ........................................................................................ 33

Figure 23. Top Silkscreen .............................................................................................................34

Figure 24. Top Routing..................................................................................................................35

Figure 25. Bottom Routing ............................................................................................................ 36

Figure 26. Bottom Silkscreen........................................................................................................37

2 DS847DB1

CDB5464U

1. HARDWARE

1.1 Introduction

The CDB5464U evaluation board provides a convenient means of evaluating the CS5464 power mea­surement IC. The CDB5464U evaluation board operates from a single +5V power supply. The evaluation
board interfaces the CS5464 to a PC via a USB cable. To accomplish this, the board comes equipped
with a C8051F320 microcontroller and a USB interface. Additionally, the CDB5464U GUI software pro­vides easy access to the internal registers of the CS5464. The software also provides a means to display
the performance in the time domain or frequency domain.

1.2 Evaluation Board Overview

The board is partitioned into two main sections: analog and digital. The analog section consists of the
CS5464 and a precision voltage reference. The digital section consists of the C8051F320 microcontroller,
EEPROM, the hardware test switches, the reset circuitry, and the USB interface. The board also has a
user friendly power supply connection.

CDB5464U

096MHz

4.

CS5464

Figure 1. CDB5464U Assembly Drawing

DS847DB1 3

CDB5464U

1.3 Analog Section

The CDB5464U evaluation board provides screw-type terminals (J23, J27, & J28) to connect input signals
to the voltage and current channels. The screw terminals are labels as VIN1-, VIN1+, IIN1+, IIN1-, and
IIN2+, IIN2-. An 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 CS5464. The three volt­age reference options include: VREFOUT from CS5464, the on-board +2.5V reference, and external
REF+ (screw terminal J14).
on J25 in the position labeled VREFOUT, the reference is supplied by the on-chip voltag e reference. With
a jumper on J25 in the position labeled VREF, the reference is supplied by an off-chip voltage reference.

Table 1 and Table 2 illustrate the options available for VREFIN. With a jumper

Reference Description J25

VREFOUT

VREF

Selects On-chip

Reference (25 ppm/

°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

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

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

Reference Description J12

LT1019

REF+

Selects On-board

LT1019 Reference

(5 ppm/

°C)

Selects External

Reference Source

(J14)

LT1019

REF+

LT1019

REF+

 O VREF

O O VREF

 O VREF

O O VREF

(Default)

Table 2. External Voltage Reference Selection for VREF

The three input signal options for the voltage (VIN1±) and current (IIN1±, IIN2±) channels input include:
an external signal (screw terminals J23, J27, and J28), GND, or VREF. Table3 illustrates the options avail­able. By installing jumpers on J17 to position VIN1-, J22 to position VIN1+, J24 to position IIN1+, J26 to
position IIN1-, J20 to position IIN2+, and J19 to position IIN2-, the input voltage signal is supplied from the
screw terminals J23, J27, and J28. With a jumper on J17, J22, J24, J26, J20, and J19 in the GND position,

4 DS847DB1

CDB5464U

the inputs are connected to analog ground (AGND). With a jumper on J17, J22, J24, J26, J20, and J19 in
position VREF, the inputs are connected to the reference voltage selected on J12.

INPUT Description J17 J22

VIN2± or VIN1±

VIN2± or VIN1±

GND

VREFIN

Selects External

Signal

Selects External

Signal

Selects Grounding

the Input

Selects Reference

Source

GND

VREF

VIN1-

GND

VREF

VIN1-

GND

VREF

VIN1-

GND

VREF

VIN1-



O VIN1-
O O VIN1-
O O VIN1-

(Default)



O VIN1-
O O VIN1-
O O VIN1-



O VIN1-
O O VIN1-
O O VIN1-



O VIN1-
O O VIN1-
O O VIN1-

VIN1+

VREF

GND

VIN1+

VREF

GND

VIN1+

VREF

GND

VIN1+

VREF

GND



O VIN1+
O O VIN1+
O O VIN1+

(Default)



O VIN1+
O O VIN1+
O O VIN1+



O VIN1+
O O VIN1+
O O VIN1+



O VIN1+
O O VIN1+
O O VIN1+

INPUT Description J24 J26 J20 J19

IIN1± or IIN2±

IIN1± or IIN2±

Selects External

Signal

Selects External

Signal

GND

VREF

IIN1+

GND

VREF

IIN1+



O IIN1+
O O IIN1+-
O O IIN1+

(Default)



O IIN1+
O O IIN1+-
O O IIN1+

IIN1-

VREF

GND

IIN1-

VREF

GND



O IIN1-
O O IIN1-
O O IIN1-

(Default)



O IIN1-
O O IIN1-
O O IIN1-

GND

VREF

IIN2+

GND

VREF

IIN2+



O IIN2+
O O IIN2+
O O IIN2+

(Default)



O IIN2+
O O IIN2+
O O IIN2+

IIN2-

VREF

GND

IIN2-

VREF

GND



O IIN2-
O O IIN2-
O O IIN2-

(Default)



O IIN2-
O O IIN2-
O O IIN2-

GND

VREFIN

Selects Grounding

the Input

Selects Reference

Source

GND

VREF

IIN1+

GND

VREF

IIN1+



O IIN1+
O O IIN1+-
O O IIN1+



O IIN1+
O O IIN1+-
O O IIN1+

IIN1-

VREF

GND

IIN1-

VREF

GND



O IIN1-
O O IIN1-
O O IIN1-



O IIN1-
O O IIN1-
O O IIN1-

GND

VREF

IIN2+

GND

VREF

IIN2+



O IIN2+
O O IIN2+
O O IIN2+



O IIN2+
O O IIN2+
O O IIN2+

IIN2-

VREF

GND

IIN2-

VREF

GND



O IIN2-
O O IIN2-
O O IIN2-



O IIN2-
O O IIN2-
O O IIN2-

Table 3. Voltage and Current Channel Input Signal Selection

1.4 Digital Section

The digital section contains the microcontroller, USB interface, JTAG header, reset circuitry, and an ex­ternal interface header (J40). The microcontroller interfaces the SPI of CS5464 with the USB conne ctio n
to the PC, enabling the GUI software to access all the CS5464 registers and functions. Interface header,
J40, is provided to allow the CDB5464U to be connected to an external energy registration device or an
external microcontroller. To connect the CS5464 to an external microcontroller, R57, R58, R59, R60, R61,
and R62 must be removed from the board. The energy output pins E1, E2, and E3 are routed to LEDs
which provide a simple visual check of the energy output pulses. The MODE pin is also routed to a LED
to indicate whether the CS5464 is operating in auto-boot mode. Jumpers J10, J13, J15, and J16 are
equipped at the factory with jumpers to enable the LEDs.

DS847DB1 5

CDB5464U

1.5 Power Supply Section

Table 4 illustrates the power supply connections to the evaluation board. The +5V binding post (J3) sup-

plies the positive analog (VA+) for the CS5464 and the +2.5V reference. The VD+_EXT binding post (J5)
supplies the digital section of the CS5464 (VD+) and level shifters. Jumper J8 allows the VD+ supply to
be sourced from the VD+_EXT binding post (J5), the +5V binding post (J3), or the regulated 3.3V supply
derived from the microcontroller. The Vu+_EXT (J6) binding post supplies the positive supply for the 8051
microcontroller (8051_REGIN). Jumper J9 allows the 8051_REGIN supply to be sourced from either the
Vu+_EXT binding post (J6), +5V binding post (J3) or VD+_EXT binding post (J5).

Power Supplies Power Post Connections VD+ 8051-REGIN

Analog (VA+) Digital (VD +) 8051 (Vu+)

+5V GND VD+EXT VU+EXT J8 J9

+5 +5 +5 +5 0

+5 +3.3 +5 +5 0

Table 4. Power Supply Connections

NC

+5

NC

NC

+3.3

NC

+5

NC

NC

+5

NC

+5

NC

+5

VD+_EXT

+5

+3.3

VD+_EXT

+5

+3.3

VD+_EXT

+5

+3.3

VD+_EXT

+5

+3.3

VD+_EXT

+5

+3.3

VD+_EXT

+5

+3.3

VD+_EXT

+5

+3.3

VD+_EXT

+5

+3.3

VD+_EXT

+5

+3.3

VD+_EXT

+5

+3.3



O VD+
O O VD+
O O VD+

(Default)



O VD+
O O VD+
O O VD+



O VD+
O O VD+
O O VD+



O VD+
O O VD+
O O VD+



O VD+
O O VD+
O O VD+



O VD+
O O VD+
O O VD+



O VD+
O O VD+
O O VD+



O VD+
O O VD+
O O VD+



O VD+
O O VD+
O O VD+



O VD+
O O VD+
O O VD+

Vu+_EXT
+5
VD+

Vu+_EXT
+5
VD+

Vu+_EXT
+5
VD+

Vu+_EXT
+5
VD+

Vu+_EXT
+5
VD+

Vu+_EXT
+5
VD+

Vu+_EXT
+5
VD+

Vu+_EXT
+5
VD+

Vu+_EXT
+5
VD+

Vu+_EXT
+5
VD+



O 8051
O O 8051
O O 8051

(Default)



O 8051
O O 8051
O O 8051



O 8051
O O 8051
O O 8051



O 8051
O O 8051
O O 8051



O 8051
O O 8051
O O 8051



O

8051

O O 8051
O O 8051



O 8051
O O 8051
O O 8051



O 8051
O O 8051
O O 8051



O 8051
O O 8051
O O 8051



O 8051
O O 8051
O O 8051

6 DS847DB1

CDB5464U

1.6 Auto-boot Mode

With a jumper connection on J18 (AUTO-BOOT ENABLE), the CS5464 operates in auto-boot mode and
the CDB5464U board operates as a stand-alone system without attaching it up to a PC. When in auto­boot mode, a hardware reset (press on S1) will cause the CS5464 to boot up using the serial data from
the serial EEPROM on the board (U10). When the CS5464 is in auto-boot mode, the SPI connections
between the microcontroller and the CS5464 are removed and the GUI software can not access the
CS5464 registers and functions.

The EEPROM must be programmed prior to the auto-boot sequence. When the CDB5464U Evaluation
Board is sent from the factory, the EEPROM is programmed with the following CS5464 command/data
sequence:

1. Move to EEPROM page 1:

0x7E 0x00 0x00 0x01

2. Write Modes register, turn high-pass filters on:
0x60 0x00 0x01 0xE0

3.

Move to EEPROM page 0:

0x7E 0x00 0x00 0x00

4. Set bit 2 (LSD) in the Ma sk re gis te r:
0x74 0x00 0x00 0x04

5. Start continuous conversion:
0xE8

6. Write STOP bit in Control register, to terminate auto-boot sequence:
0x78 0x00 0x01 0x00

This sequence programs the CS5464 for continuous conversion mode. If voltage and current signals are
applied to the inputs, the CS5464 will issue pulses on the E1

pin. See the CS5464 data sheet for more

details on auto-boot.

DS847DB1 7

2. SOFTWARE

CDB5464U

The evaluation board comes with software and an USB cable to link the evaluation board to the PC. The
evaluation software was developed with LabWindows
tional Instruments. The evaluation software is available for download on the Cirrus Logic web site at

http://www.cirrus.com/industrialsoftware

Windows XP

®

.

and was designed to run under Windows®2000 or

®

/CVI®, a software development package from na-

2.1 Installation

To install the software, go to the Cirrus Logic web site at http://www.cirrus.com/industrialsoftware and re-
fer to application note AN278.

2.2 Using the Software

Before launching the software, check all jumper settings on the CDB5464 U evaluation board as described
in Section 1, and connect the board to an open USB port on the PC using the provided cable. Once the
board is powered on, the software program can be launched.

2.3 Start-up Window

When the software is launched, the start-up window will appear. This window contains information con­cerning the software's title, revision number, copyright date, etc. See Figure 2.

Figure 2. GUI Start-up Window

At the top of the screen is a menu bar which displays user options. The menu bar has three items: Menu,
Setup, and Quit. Initially Menu is disabled. After establishing a link to a data source, the Menu item will

become available.

8 DS847DB1

CDB5464U

2.3.1 Setup Menu

Setup allows user to establish a USB communication connection with CDB5464U board or select a pre­viously saved data file for further analysis.

If the USB item in the Setup menu is selected, the evaluation software will poll the CDB5464U, verifying
the serial communication link is ready. At this point, the USB menu item is checked indicating that the PC
has successfully communicated with CDB5464U evaluation board, and device and micro-code version
information are read from the board and displayed on the screen. See Figure 3. Due to improvements to
the software or new features being added, the version displayed may be different than the image shown
here.

Figure 3. Setup Menu Showing Successful USB Connection

If the evaluation software is unable to establish a communication link with the CDB5464U board, a mes­sage will appear, indicating that the initial communication has failed. See Figure 4.

Figure 4. USB Error Message

Check to verify that the USB cable is connected properly and the power su pply is on and connected prop­erly to the CDB5464U. Reset the board (press the RESET button on the board) and try to setup the USB
connection again.

DS847DB1 9

CDB5464U

If the Data from Disk item in the Setup menu is selected, a file selection window will appear as shown in
Figure 5. User can select a pre-saved data file for further analysis using time domain, FFT, and histogram
plots in Data Collection Window of the software.

Figure 5. Data from Disc File Selection Window

2.3.2 Menu Pull-down

Excluding the Start-Up window, the Menu pull-down provides 7 options: Setup Window, Calibration Win­dow, Conversion Window, Pulse Rate Window, Data Collection Window, EEPROM Window, and Debug
Window. Each window provides a means to evaluate the different functions and performance of the

CS5464. Each option has an associated function key (<F1>, <F2>, etc.). See Figure 6.

Figure 6. Menu Pull-down Options

10 DS847DB1

CDB5464U

2.3.3 Quit Menu

The Quit menu allows the user to exit the evaluation software. Upon selecting Quit, a message window
appears and queries if exiting the evaluation software is desired. See Figure 7.

Figure 7. Quit Dialog

DS847DB1 11

CDB5464U

2.4 Setup Window

The evaluation software provides access to the CS5464's internal registers through the Setup window.
See Figure 8. The user can enter the Setup window by pulling down the Menu menu and selecting Setup
Window, or by pressing <F2> on the keyboard.

In the Setup window, all of the CS5464's registers are displayed in hexadecimal notation and are de coded
to provide easier readability. Refer to the CS5464 data sheet for information on register fun ctio nality a nd
definitions. See Figure 8.

Figure 8. Setup Window

12 DS847DB1