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User's Guide

SLUU426 – June 2010

bq27520EVM With System-Side, Single-Cell Impedance

Track™ Technology

This evaluation module (EVM) is a complete evaluation system for the bq27520. The EVM includes one
bq27520 circuit module, a current sense resistor, one thermistor, an EV2300 PC interface board for gas
gauge interface and a PC USB cable. The circuit module includes one bq27520 integrated circuit and all
other onboard components necessary to monitor and predict capacity for a system-side fuel gauge
solution. The circuit module connects directly across the battery pack. With the EV2300 interface board
and software, the user can read the bq27520 data registers, program the chipset for different pack
configurations, log cycling data for further evaluation, and evaluate the overall functionality of the bq27520
solution under different charge and discharge conditions. The latest Windows™-based PC software can
be downloaded from the product folder on the Texas Instruments Web site.

Contents

1

Features

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2

2

bq27520-Based Circuit Module

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2

3

Circuit Module Physical Layouts, Bill of Materials, and Schematic

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3

4

EVM Hardware and Software Setup

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8

5

Troubleshooting Unexpected Dialog Boxes

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8

6

Hardware Connection

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8

7

Operation

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10

8

Calibrate Screen

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12

9

I2C Pro Screen

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14

10

bqEASY™ Software

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14

11

Related Documentation From Texas Instruments

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19

List of Figures

1

bq27520EVM-001 Layout – Silk Screen

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3

2

Top Assembly

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4

3

Top Layer

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4

4

Bottom Layer

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5

5

Schematic

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7

6

bq27520 Circuit Module Connection to Cell and System Load/Charger

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9

7

DataRAM Screen

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10

8

Data Flash Screen

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11

9

Calibration Screen

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13

10

I2C Pro Screen

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14

11

bqEASY™ Welcome Screen

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15

12

bqEASY™ Flowchart

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16

13

Load and Switch

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19

List of Tables

1

Ordering Information

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2

bqEASY, Impedance Track are trademarks of Texas Instruments.
Windows, Microsoft are trademarks of Microsoft Corporation.
I

2

C is a trademark of Philips Corporation.

1

SLUU426 – June 2010

bq27520EVM With System-Side, Single-Cell Impedance Track™ Technology

Copyright © 2010, Texas Instruments Incorporated

Summary of Contents for Track bq27520EVM

Page 1: ...wnloaded from the product folder on the Texas Instruments Web site Contents 1 Features 2 2 bq27520 Based Circuit Module 2 3 Circuit Module Physical Layouts Bill of Materials and Schematic 3 4 EVM Hard...

Page 2: ...y 2 bq27520 Based Circuit Module The bq27520 based circuit module is a complete and compact example solution of a bq27520 circuit for battery management The circuit module incorporates a bq27520 batte...

Page 3: ...ut that signals interrupt for changes in SOC 3 Circuit Module Physical Layouts Bill of Materials and Schematic This section contains the board layout bill of materials assembly drawings and schematic...

Page 4: ...Layouts Bill of Materials and Schematic www ti com Figure 2 Top Assembly Figure 3 Top Layer 4 bq27520EVM With System Side Single Cell Impedance Track Technology SLUU426 June 2010 Copyright 2010 Texas...

Page 5: ...m 0 55 x 0 25 inch OST ED555 4DS 2 J3 J8 Header Friction Lock Ass y 4 pin Right Angle 0 400 x 0 500 Molex 22 05 3041 2 J4 J9 Header Male 3 pin 100 mil spacing 36 pin 0 100 inch x 3 Sullins PEC36SAAN s...

Page 6: ...ption Size Manufacturer Part Number nt 1 TP4 Test Point White Thru Hole Color Keyed 0 100 x 0 100 Keystone 5002 inch 1 U1 IC System Side Impedance Track Fuel BGA Texas BQ27520YZF Gauge Instruments 6 b...

Page 7: ...hematic 3 3 bq27520 Circuit Module Performance Specification Summary This section summarizes the performance specifications of the bq27520 circuit module 7 SLUU426 June 2010 bq27520EVM With System Sid...

Page 8: ...as downloaded from the TI Web site 4 Follow the instructions on screen until completing the software installation 5 Before starting the evaluation software connect the EV2300 to the computer using the...

Page 9: ...the bq27520 based EVM to the EV2300 using wire leads as shown in Table 4 Table 4 Circuit Module to EV2300 Connections bq27520 Based Battery EV2300 SDA SDA SCL SCL VSS GND 2 Connect the PC USB cable to...

Page 10: ...ithin this period The bq27520 EVSW provides a logging function which logs the values that were last scanned by EVSW To enable this function select the Start Logging button this causes the Keep Scannin...

Page 11: ...520 data flash click on menu option Data Flash Read All To write to a data flash location click on the desired location enter the data and press Enter which writes the entire tab of flash data or sele...

Page 12: ...ess the Calibrate Part as indicated below button After all calibration is complete close the Calibrate subwindow While the Calibrate subwindow is open even in the background the calibration routines a...

Page 13: ...the current with a calibrated meter and type the value into Enter Actual Current using for current in discharge direction Press the Calibrate Part as indicated below button Figure 9 Calibration Scree...

Page 14: ...challenging to get started with the evaluation process In addition determining the correct chemistry model and producing the golden image file can be time consuming The bqEASY program is designed to...

Page 15: ...w the steps sequentially from 1A to 5C You can use the Next button or click on the top tabs and left subsection labels to move to any desired page Some operations must be completed in sequence due to...

Page 16: ...cycling corruption 5C Write Ra Table Qmax Cycle Count and Update Status to gauge 5C Reset Gauge 5C Read flash save golden DFI file bqEASY Software www ti com Figure 12 bqEASY Flowchart 10 3 Simplified...

Page 17: ...r contact TI For the bqEASY program the ENCR files act mainly as a dictionary to look up the address for a given data flash location For bqEVSW they define screen parameters including address display...

Page 18: ...the checkmarks 2 Configure A series of eight screens is used to collect information about the battery pack application to enable automatic configuration of the most critical data flash parameters 3 C...

Page 19: ...nstruments Literature Response Center at 800 477 8924 or the Product Information Center PIC at 972 644 5580 When ordering identify this document by its title and literature number Updated documents al...

Page 20: ...duct This notice contains important safety information about temperatures and voltages For additional information on TI s environmental and or safety programs please contact the TI application enginee...

Page 21: ...h statements TI products are not authorized for use in safety critical applications such as life support where a failure of the TI product would reasonably be expected to cause severe personal injury...

Page 22: ...Mouser Electronics Authorized Distributor Click to View Pricing Inventory Delivery Lifecycle Information Texas Instruments BQ27520EVM...

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