Texas Instruments Bq27742EVM Manuale utente

User's Guide

SLUUAX8–March 2014

bq27742EVM Single-Cell Impedance Track™ Technology

Evaluation Module

This evaluation module (EVM) is a complete evaluation system for the bq27742-G1 fuel gauge. The EVM

includes one bq27742 circuit module, a current sense resistor, two thermistors, and two protection N-

FETs. An EV2400 PC interface board and a PC USB cable are required for fuel gauge interface, but must

be ordered separately. The circuit module includes one bq27742 integrated circuit and all other onboard

components necessary to monitor and predict capacity for a pack-side fuel gauge solution and to perform

the protection. The circuit module connects directly across the battery cell. With the EV2400 interface

board and software, the user can read the bq27742 data registers, program the chipset for different pack

configurations, log cycling data for further evaluation, and evaluate the overall functionality of the bq27742

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....................................................................................................................... 2

2 bq27742-Based Circuit Module ............................................................................................ 2

3 Circuit Module Physical Layouts, Bill of Materials, and Schematic ................................................... 3

4 EVM Hardware and Software Setup ...................................................................................... 8

5 Troubleshooting Unexpected Dialog Boxes.............................................................................. 8

6 Hardware Connection ....................................................................................................... 9

7 Operation.................................................................................................................... 11

8 Calibrate Screen............................................................................................................ 14

9 Firmware Screen ........................................................................................................... 16

10 Send HDQ Screen ......................................................................................................... 17

11 Related Documentation From Texas Instruments ..................................................................... 17

12 Revision History ............................................................................................................ 17

List of Figures

1 bq27742EVM Layout, Silk Screen......................................................................................... 3

2 Top Assembly ................................................................................................................ 4

3 Top Layer..................................................................................................................... 4

4 Bottom Layer ................................................................................................................. 4

5 Schematic..................................................................................................................... 7

6 bq27742 Circuit Module Connection to Cell and System Load/Charger ............................................. 9

7 Battery Management Studio Screen..................................................................................... 11

8 DataMemory Screen....................................................................................................... 12

9 Calibration Screen.......................................................................................................... 14

10 Firmware Screen ........................................................................................................... 16

List of Tables

1 Ordering Information ........................................................................................................ 2

2 Bill of Materials............................................................................................................... 5

3 Performance Specification Summary ..................................................................................... 8

4 Circuit Module to EV2300 Connections – I2C........................................................................... 10

5 Circuit Module to EV2300 Connections – HDQ ........................................................................ 10

SLUUAX8–March 2014 bq27742EVM Single-Cell Impedance Track™ Technology Evaluation Module

Features

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1 Features

• Complete evaluation system for the bq27742 fuel gauge with Impedance Track™ Technology

• Populated circuit module for quick setup

• Personal computer (PC) software and interface board for easy evaluation

• Software that allows data logging for system analysis

• Ability to upgrade to the latest firmware version by flash reprogramming

1.1 Kit Contents

• bq27742 circuit module

This EVM is used for the evaluation of different bq27742-based products. Please ensure that you visit the

product Web folder at http://www.ti.com to download the latest firmware version, evaluation software, and

documentation for the associated product to be evaluated.

1.2 Ordering Information

Table 1. Ordering Information

EVM Part Number Chemistry Configuration Capacity

bq27742EVM Li-Ion 1 cell Any

2 bq27742-Based Circuit Module

The bq27742-based circuit module is a complete and compact example solution of a bq27742 circuit for

battery management. The circuit module incorporates a bq27742 battery fuel gauge IC, dual N-FETs for

high-side protection, and all other components necessary to protect and accurately predict the capacity of

a 1-series Li-ion cell.

2.1 Circuit Module Connections

Contacts on the circuit module provide the following connections:

• Direct connection to the battery cell (TB1 or TP1/TP2): CELL+ and CELL–

• Connect a charger power to TB2: PACK+ and PACK–, or short the PACK+ and CELL+ to wake up the

gauge, then remove the connection of PACK+ and CELL+ or the charger

• To the serial communications port: SDA, SCL, and VSS (J10) or HDQ and VSS (J8)

• The system load and charger connect across charger and load (TB2 or TP9/TP10): PACK–/LOAD–

and PACK+/LOAD+.

Impedance Track is a trademark of Texas Instruments.

Windows is a trademark of Microsoft Corporation.

Microsoft is a registered trademark of Microsoft Corporation.

2bq27742EVM Single-Cell Impedance Track™ Technology Evaluation Module SLUUAX8–March 2014

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11 1

Ext.VSS

CELL Ext.

CELL+

CELL-

CELL+

VPWR

CHG

BAT

DSG

RA0

REG25

LOAD+

PACK-/

HDQ

THERM

LOAD-

PACK+/

FET

BYPASS

LOAD-

PACK-/

HDQ

VSS

AUX

TEMP

INT. 1.8V Pull up

HDQ PULLUP

TEXAS INSTRUMENTS

PWR628 Rev. A

SDA

SCL

VSS

bq27742EVM

J11

J12 J13

J14

J15

J2 J3

J10

R10

R11

R13

R14R15

R18

R8 R9

TB1

TB2

RT1

RT2

TP2

TP3

TP6

TP9

TP1

TP10

TP11

TP4

TP5

TP7

TP8

Q2 Q3

www.ti.com

bq27742-Based Circuit Module

2.2 Pin Descriptions

Pin Name Description

PACK+ Pack positive terminal

PACK– Pack negative terminal

CELL+ Cell positive terminal

CELL– Cell negative terminal

TERM Thermistor input that leads to IC TS pin

SDA I2C communication data line

SCL I2C communication clock line

HDQ Single-wire communication line

VSS Signal return for communication line

3 Circuit Module Physical Layouts, Bill of Materials, and Schematic

This section contains the printed-circuit board (PCB) layout, bill of materials, assembly drawings, and

schematic for the bq27742 circuit module.

3.1 Board Layout

This section shows the printed-circuit board (PCB) layers (Figure 1 through Figure 4), assembly drawing,

and schematic for the bq27742 module.

Figure 1. bq27742EVM Layout, Silk Screen

SLUUAX8–March 2014 bq27742EVM Single-Cell Impedance Track™ Technology Evaluation Module

Circuit Module Physical Layouts, Bill of Materials, and Schematic

www.ti.com

Figure 2. Top Assembly

Figure 3. Top Layer

Figure 4. Bottom Layer

4bq27742EVM Single-Cell Impedance Track™ Technology Evaluation Module SLUUAX8–March 2014

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Circuit Module Physical Layouts, Bill of Materials, and Schematic

3.2 Bill of Materials and Schematic

Table 2. Bill of Materials

Count Reference Value Description Size Part Number MFR

Designator

6 C1, C2, C5, 0.1 µF Capacitor, Ceramic, 10 V, 0402 GRM155R61A104KA01D Murata

C6, C7, C8 X5R, 10%

1 C3 1 µF Capacitor, Ceramic, 6.3 V, 0402 GRM155R60J105KE19D Murata

X5R, 10%

1 C4 0.47 µF Capacitor, Ceramic, 0.47 0402 GRM155R60J474KE19D Murata

µF, 6.3 V, X5R, 10%

2 D1, D2 AZ23C5V6-7 Diode, Dual, Zener, 5.6 V, SOT23 AZ23C5V6-7-F Diodes

300 mW

1 J1 ED555/2DS Terminal Block, 2-pin, 6-A, 0.27 x 0.25 ED555/2DS OST

3.5 mm inch

9 J2, J3, J4, PEC03SAAN Header, Male 3-pin, 100mil 0.100 inch x PEC03SAAN Sullins

J6, J11, spacing 3

J12, J13,

J14, J15

3 J5, J7, J9 PEC02SAAN Header, Male 2-pin, 100mil 0.100 inch x PEC02SAAN Sullins

spacing 2

2 J8, J10 22-05-3041 Header, Friction Lock 0.400 x 22-05-3041 Molex

Ass'y, 4-pin Right Angle 0.500

1 Q1 UPA2375T1P-E1- MOSFET, Dual N-Channel WSCP UPA2375T1P-E1-A Renesas

A NexFET, 12 V 3.2 A Electronics

America

0 Q2, Q3, Q4 DNP MOSFET, Dual N-Channel WSCP UPA2375T1P-E1-A Renesas

NexFET, 12 V 3.2 A Electronics

America

2 R1, R3 200 ΩResistor, Chip, 1/16-W, 5% 0402 CRCW0402200RJNED Vishay Dale

1 R12 4.7 kΩResistor, Chip, 1/16-W, 5% 0402 CRCW04024K70JNED Vishay Dale

1 R13 2 kΩResistor, Chip, 1/16-W, 5% 0402 CRCW04022K00JNED Vishay Dale

2 R14, R15 10 kΩResistor, Chip, 1/16-W, 5% 0402 CRCW040210K0JNED Vishay Dale

2 R16, R17 10 ΩResistor, Chip, 1/16-W, 5% 0402 CRCW040210R0JNED Vishay Dale

1 R2 5 mΩRes, Metal Current sense, 1632 MCS1632R005FER Ohmite

1W, ±1%, 50 ppm

6 R4, R6, R7, 100 ΩResistor, Chip, 1/16-W, 5% 0402 CRCW0402100RJNED Vishay Dale

R8, R9 R10

2 R5, R11 1 kΩResistor, Chip, 1/16-W, 5% 0402 CRCW04021K00JNED Vishay Dale

2 RT1, RT2 10 kΩThermistor, 10 kΩ0.095 x 103AT-2 Semitec

0.150 inch

1 TB1 ED1515 Terminal Block, 3-pin, 6-A, 0.41 x 0.25 ED555/3DS OST

3.5 mm inch

1 TB2 ED555/4DS Terminal Block, 4-pin, 6-A, 0.55 x 0.25 ED555/4DS OST

3.5 mm inch

7 TP1, TP4, 5001 Test Point, Black, Thru 0.100 x 5001 Keystone

TP5, TP7, Hole Color Keyed 0.100 inch

TP8, TP10,

TP11

4 TP2, TP3, 5000 Test Point, Red, Thru Hole 0.100 x 5000 Keystone

TP6, TP9 Color Keyed 0.100 inch

1 U1 bq27742YZFR-G1 IC, Single Cell Li-Ion Pack BGA-15 bq27742YZFR-G1 TI

Side Fuel Gauge with

Integrated Protection

1 -- PCB PWR231 Any

SLUUAX8–March 2014 bq27742EVM Single-Cell Impedance Track™ Technology Evaluation Module

Circuit Module Physical Layouts, Bill of Materials, and Schematic

www.ti.com

(1) These assemblies are ESD sensitive, ESD precautions should be observed.

(2) These assemblies must be clean and free from flux and all contaminants.

Use of no clean flux is not acceptable.

(3) These assemblies must comply with workmanship standards IPC-A-610 Class 2.

(4) Reference designators marked with an asterisk ('**') cannot be substituted.

All other components can be substituted with equivalent manufacturer's components.

6bq27742EVM Single-Cell Impedance Track™ Technology Evaluation Module SLUUAX8–March 2014

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Circuit Module Physical Layouts, Bill of Materials, and Schematic

Figure 5. Schematic

SLUUAX8–March 2014 bq27742EVM Single-Cell Impedance Track™ Technology Evaluation Module

Circuit Module Physical Layouts, Bill of Materials, and Schematic

www.ti.com

3.3 bq27742 Circuit Module Performance Specification Summary

This section summarizes the performance specifications of the bq27742 circuit module.

Table 3. Performance Specification Summary

Specification Min Typ Max Unit

Input voltage Pack+ to Pack– 2.7 3.6 4.35 V

Charge and discharge current 0 1 2 A

4 EVM Hardware and Software Setup

This section describes how to install the bq27742EVM PC software, and how to connect the different

components of the EVM.

4.1 System Requirements

The Battery Management Studio software requires Windows XP or later. Using later versions of Windows

operating system can have issues with the USB driver support. The EV2300 USB drivers have been

tested for Windows 98SE and Windows XP, but no assurance is made for problem-free operation with

specific system configurations. The EV2300 interface board is not officially supported for 64-bit versions of

Windows and typically does not work with Windows 7 or newer. The EV2400 interface board is the

recommended USB-I2C interface for Windows 7 and other 64-bit versions. No driver installation is required

for use of EV2400 interface board. The EV2400 interface board has built-in I2C pullups while the EV2300

interface board does not. Jumpers J7 and J9 can be removed from the bq27742EVM if the EV2400

interface board is used.

4.2 Software Installation

Find the latest software version in the bq27742 tool folder on power.ti.com. Make a search by Part

Number for bq27742 to access the tool folder. Currently the most recent firmware version is bq27742-G1.

Use the following steps to install the bq27742 Battery Management Studio software:

1. Ensure that the EV2300 or EV2400 interface board is not connected to the personal computer (PC)

through the USB cable before starting this procedure.

2. Open the archive containing the installation package, and copy its contents into a temporary directory.

3. Open the software file that was 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 or EV2400 interface board to the

computer using the USB cable.

6. If the EV2300 interface board is connected, wait until system prompt New Hardware Found appears.

Choose Select Location Manually, and use the Browse button to point to subdirectory TIUSBWin2K-

XP-1.

7. Answer Continue to the warning that drivers are not certified with Microsoft®.

8. If the EV2300 interface board is connected, after the previous installation finishes, another system

prompt New Hardware Found appears. Repeat steps 1 through 5, but specify the directory as

TIUSBWin2K-XP-2.

9. Answer Continue to the warning that drivers are not certified with Microsoft. Driver installation is now

finished.

10. For the EV2400 interface board, the driver should be installed along with software installation.

5 Troubleshooting Unexpected Dialog Boxes

The user who is downloading the files must be logged in as the administrator. The driver is not signed, so

the administrator must allow installation of unsigned drivers in the operating system. If using Windows 7,

install the software with administrator privileges.

8bq27742EVM Single-Cell Impedance Track™ Technology Evaluation Module SLUUAX8–March 2014

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USB

EV2300

SMB I2C HDQ

11 1

Ext.VSS

CELL Ext.

CELL+

CELL-

CELL+

VPWR

CHG

BAT

DSG

RA0

REG25

LOAD+

PACK-/

HDQ

THERM

LOAD-

PACK+/

FET

BYPASS

LOAD-

PACK-/

HDQ

VSS

AUX

TEMP

INT. 1.8V Pull up

HDQ PULLUP

TEXAS INSTRUMENTS

PWR628 Rev. A

SDA

SCL

VSS

bq27742EVM

J11

J12 J13

J14

J15

J2 J3

J10

R10

R11

R13

R14R15

R18

R8 R9

TB1

TB2

RT1

RT2

TP2

TP3

TP6

TP9

TP1

TP10

TP11

TP4

TP5

TP7

TP8

Q2 Q3

bq27742 EVM

Power

Supply

3.6V

Load Charger

www.ti.com

Hardware Connection

6 Hardware Connection

Use of the bq27742EVM-001 requires three hardware components:

• bq27742 circuit module

• EV2300 or EV2400 PC interface board

• Windows PC

6.1 Connecting the bq27742 Circuit Module to a Battery Cell

Figure 6 shows how to connect the bq27742 circuit module to the cell and system load/charger.

Figure 6. bq27742 Circuit Module Connection to Cell and System Load/Charger

6.2 PC Interface Connection

The bq27742 fuel gauge can be configured as an HDQ communication device or left in default as an I2C

device. Once the bq27742 fuel gauge is configured for HDQ communication, it cannot be reverted to I2C

mode. See Section 10 for information on configuring the bq27742 fuel gauge to HDQ mode.

SLUUAX8–March 2014 bq27742EVM Single-Cell Impedance Track™ Technology Evaluation Module

Hardware Connection

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The following steps configure the hardware for interfacing to the PC:

1. Connect the bq27742-based EVM to the EV2300 interface board using wire leads as shown in Table 4

and Table 5.

Table 4. Circuit Module to EV2300 Connections – I2C

bq27742-Based Battery (I2C Mode) EV2300 (I2C Port)

SDA SDA

SCL SCL

VSS GND

Table 5. Circuit Module to EV2300 Connections – HDQ

bq27742-Based Battery (HDQ Mode) EV2300 (HDQ Port)

HDQ HDQ

VSS GND

2. Connect a charger to wake-up the gauge, can use a power supply between PACK+ and PACK– or

short CELL+ and PACK+. After wake-up, the charger can be removed.

3. Connect the PC USB cable to the EV2300 interface board and the PC USB port.

The bq27742EVM is now set up for operation.

10 bq27742EVM Single-Cell Impedance Track™ Technology Evaluation Module SLUUAX8–March 2014

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