Texas Instruments Bq27x10EVM User manual

User's GuideSLUU259 – October 2006

bq27x10EVM Single-Cell Battery Fuel GaugeEvaluation Module

The bq27x10EVM is a complete evaluation system for the bq27x10 single-cell Li-ionand Li-polymer battery gas gauge device.

Contents1 Introduction .......................................................................................... 22 bq27x10-Based Circuit Module ................................................................... 33 bq27x10EVM Circuit Module Schematic ........................................................ 44 bq27x10EVM Circuit Module Physical Layouts ................................................. 45 bq27x10EVM Circuit Module List of Materials .................................................. 86 bq27x10EVM Circuit Module Performance Specification Summary ......................... 97 EVM Hardware and Software Setup ............................................................ 108 Operation ........................................................................................... 11

List of Figures

1 bq27x10EVM Schematic .......................................................................... 42 bq27x10EVM Topside Assembly ................................................................. 53 bq27x10EVM Silkscreen ........................................................................... 54 bq27x10EVM Layer 1 Layout ..................................................................... 65 bq27x10EVM Layer 2 Layout ..................................................................... 76 bq27x10EVM Layer 3 Layout ..................................................................... 87 bq27x10EVM Layer 4 Layout ..................................................................... 88 bq27x10EVM Circuit Module Connection to Cells and System Load/Charger ............ 109 Initial Register Screen ............................................................................ 1110 EEPROM Screen .................................................................................. 1211 Pro Screen ......................................................................................... 1412 Calibration Screen ................................................................................ 15

List of Tables

1 Ordering Information ............................................................................... 22 Test Points ........................................................................................... 33 List of Materials ..................................................................................... 94 Performance Specification Summary ............................................................ 95 Circuit Module-to-EV2300 Connection ......................................................... 116 Example Data Log ................................................................................ 16

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1 Introduction

1.1 Features

1.2 Kit Contents

1.3 Ordering Information

Introduction

The bq27x10EVM includes one bq27x10EVM circuit module, an EV2300 PC interface board for gasgauge evaluation, a USB cable, CD ROM including Windows™-based PC software and supportdocumentation. The circuit module includes one bq27x10, a current sense resistor, and all othercomponents onboard necessary to calculate remaining battery capacity and predict system run-time toempty. The circuit module connects directly across the cell in a battery. With the PC interface board andsoftware, the user can read the bq27x10 data registers, program the on-chip configuration EEPROM, andevaluate the functions of the bq27x10 under different charge and discharge conditions.

•Complete evaluation system for the bq27x10 battery gas gauge•Populated circuit module for quick setup•PC software and interface board for easy evaluation•Software allows EEPROM programming and data logging for system analysis

1. bq27x10EVM circuit module with sense resistor2. PC interface board (EV2300 for USB interface)3. CD ROM including Windows-based PC software and support documentation4. USB cable5. Set of support documentation

Table 1. Ordering Information

EVM PART NUMBER PC INTERFACE BOARD CHEMISTRY PACK VOLTAGE CAPACITY

bq27x10EVM USB Li-Ion 2.6 v to 4.5 V 100 to 2000 mAh

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2 bq27x10-Based Circuit Module

bq27x10-Based Circuit Module

The bq27x10EVM-based circuit module is an example circuit for battery fuel gauging of a single-cellLi-ion/Li-polymer battery pack. The EVM module has two separate circuits. One is the active bq27x10 fuelgauging circuitry; the other is the logic and power control to program the on-chip configuration EEPROMof the bq27x10. In a typical application, only the active fuel gauging circuitry is required. The EEPROMprogramming circuitry would be required in a test setup to configure the bq27x10 for the application byprogramming the EEPROM.

Contacts on the circuit module provide direct connection to the cell (J1-1, J2-2), and the serialcommunications port (J1-3). The system load and charger connect across J1-1 and J2-1.

Table 2. Test Points

TEST POINT SIGNAL NAME DESCRIPTION

J1-1 PACK+ Cell positive/pack positiveJ1-2 SCL Used only with bq27210 as the I2C Clock lineJ1-3 SDA/HDQ Single-wire HDQ line for bq27010 or I2C Data line forbq27210J2-1 PACK– Pack negativeJ2-2 BAT– Cell negativeJ3-1 21V High voltage for EEPROM programmingJ3-2 PROG Input for timing of EEPROM programming pulseJ3-3 GPIO/ADIN GPIO pin of bq27x10

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3 bq27x10EVM Circuit Module Schematic

4 bq27x10EVM Circuit Module Physical Layouts

bq27x10EVM Circuit Module Schematic

Figure 1. bq27x10EVM Schematic

Figure 2 through Figure 7 show the PCB layers and assembly drawing for the bq27x10EVM circuitmodule.

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bq27x10EVM Circuit Module Physical Layouts

Figure 2. bq27x10EVM Topside Assembly

Figure 3. bq27x10EVM Silkscreen

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bq27x10EVM Circuit Module Physical Layouts

Figure 4. bq27x10EVM Layer 1 Layout

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bq27x10EVM Circuit Module Physical Layouts

Figure 5. bq27x10EVM Layer 2 Layout

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5 bq27x10EVM Circuit Module List of Materials

bq27x10EVM Circuit Module List of Materials

Figure 6. bq27x10EVM Layer 3 Layout

Figure 7. bq27x10EVM Layer 4 Layout

Table 3 contains the list of materials required for the bq27x10EVM circuit module.

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6 bq27x10EVM Circuit Module Performance Specification Summary

bq27x10EVM Circuit Module Performance Specification Summary

Table 3. List of Materials

REF DES 27010 27210 DESCRIPTION MFR PART NUMBER

QTY QTY

C1, C2, 5 5 Capacitor, ceramic, 0.1 µF, 10 V, X5R, 402 Murata GRM155R61A104KA01DC3, C4,C5

D1, D3 2 2 Diode, Zener, 5.6 V, 350 mW, SOT23 Diodes, Inc. BZX84C5V6TD2 1 1 Diode, Dual, Zener, 5.6 V, 300 mW, SOT23 Diodes, Inc. AZ23C5V6Q1 1 1 MOSFET, N-channel, 2N7002, 60 V, 250 mA, 3 Ω, Vishay-Siliconix 2N7002ESOT23Q2 1 1 MOSFET, P-channel, ZVP3306, –60 V, 0.09 A, 14 Ω, Zetex ZVP3306SOT23R1, R2, 3 3 Resistor, chip, 100 Ω, 1/16 W, 5%, 603 Std StdR11

R13, R14, 3 3 Resistor, chip, 1 M Ω, 1/16 W, 5%, 603 Std StdR16

R12 1 1 Resistor, chip, 100 k Ω, 1/16 W, 5%, 603 Std StdR3, R6, 3 3 Resistor, chip, 1 k Ω, 1/16 W, 5%, 402 Std StdR7

R4, R5, 4 4 Resistor, chip, 100 Ω, 1/16 W, 5%, 402 Std StdR9, R10R17, R18 0 2 Resistor, chip, 15 k Ω, 1/16 W, 5%, 603 Std StdR15 1 1 Resisitor, chip, 10k Ω, 1/16 W, 5%, 402 Std StdR8 1 1 Resistor, chip, 0.02 Ω, 0.25 W, 1%, 1206 Vishay WSL1206U1 1 0 Single cell Li-Ion/Polymer gas gauge device, QFN Texas bq27010DRKInstrumentsU1 0 1 Single cell Li-Ion/Polymer gas gauge device, QFN Texas bq27210DRKInstrumentsJ1, J3 2 2 Terminal blocks, 3 position OST ED1515J2 1 1 Terminal blocks, 2 position OST ED1514J4 0 1 Header, 2-pin, 100mil spacing, (36-pin strip) Sullins PTC36SAANN/A 1 1 PCB Any HPA212

Table 4 gives the performance specifications of the bq27x10EVM circuit module.

Table 4. Performance Specification Summary

SPECIFICATION MIN TYP MAX UNIT

Input Voltage PACK+/BAT– 2.6 4.5 VCharge and Discharge Current

(1)

2.5 A

(1)

Charge and discharge maximum is limited by the PCB design and power dissipation of the 20-m Ω1/4-W sense resistorincluded in the kit.

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7 EVM Hardware and Software Setup

7.1 Software Installation

7.2 Hardware Connection

7.2.1 Connecting the bq27x10EVM Circuit Module to a Battery Pack

PACK+ BAT-

PACK-

System Load/

Charger

Single Cell Li-Ion

7.2.2 PC Interface Connection

EVM Hardware and Software Setup

This section describes how to install the bq27x10EVM PC software and how to connect the differentcomponents of the EVM.

The following steps install the bq27x10EVM evaluation software:1. Insert CD ROM into a CD ROM drive.2. Select the CD ROM drive using My Computer or File Manager.3. Select the ReadMeFirst.txt file.4. Follow the instructions to install USB drivers for EV2300.5. After installing the USB drivers for EV2300, double-click on the Setup.exe icon.6. The setup program installs a Windows™ application group

The three hardware components to the bq27x10EVM are:•The bq27x10EVM circuit module•The PC interface board (EV2300)•The PC.

Figure 8 shows how to connect the bq27x10EVM circuit module to a Li-ion cell and the systemload/charger.

Figure 8. bq27x10EVM Circuit Module Connection to Cells and System Load/Charger

The following steps configure the hardware for interface to the PC:1. Connect colored wires that are included with EV2300 to bq27x10EVM using Table 5 as a guide.2. For bq27010 connect the connector with colored wires to the HDQ connector that is on the EV2300.HDQ connection is located on the top right of EV2300. For the bq27210, connect the connector withcolored wires to the I

C connector that is on the EV2300. The I

C connection is just below the HDQconnection on the EV2300.3. Connect the PC USB cable to the EV2300 and the PC USB port.

The bq27x10EVM is now set up for operation.

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Table of contents

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