Texas Instruments Bq27546EVM Manual de usuario

User's Guide

SLUUB83–May 2015

bq27546EVM Single-Cell Impedance Track™ Technology

Evaluation Module

This evaluation module (EVM) is a complete evaluation system for the bq27546. The EVM includes one

bq27546 circuit module, with a current sense resistor, and thermistor. The circuit module includes one

bq27546 integrated circuit (IC), and all other onboard components necessary to monitor and predict

capacity. The circuit module connects directly across the cell in a battery. With the EV2300/EV2400

interface board and software, the user can read the bq27546 data registers, program the chipset for

different pack configurations, log cycling data for further evaluation, and evaluate the overall functionality

of the bq27546 solution under different charge and discharge conditions.

Contents

1 Features....................................................................................................................... 2

2 bq27546-Based Circuit Module ............................................................................................ 2

3 bq27546 Circuit Module Schematic ....................................................................................... 3

4 Circuit Module Physical Layouts and Bill of Materials .................................................................. 3

5 EVM Hardware and Software Setup ...................................................................................... 8

6 Troubleshooting Unexpected Dialog Boxes.............................................................................. 8

7 Hardware Connection ....................................................................................................... 8

8 Operation.................................................................................................................... 10

9 Calibrate Screen............................................................................................................ 11

10 Advanced Communication I2C ........................................................................................... 14

11 Related Documentation From Texas Instruments ..................................................................... 16

List of Figures

1 bq27546EVM Layout, Silkscreen.......................................................................................... 3

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

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

4 Bottom Layer ................................................................................................................. 5

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

6 bq27546 Circuit Module Connection to Cell and System Load or Charger.......................................... 9

7 Registers Screen........................................................................................................... 10

8 Data Memory Screen ...................................................................................................... 11

9 Calibration Screen.......................................................................................................... 13

10 Advanced Comm I2C Screen ............................................................................................. 14

11 Parameter Q&A Screen ................................................................................................... 15

12 Golden Image Output Screen ............................................................................................ 15

13 Perform Programming Screen............................................................................................ 15

List of Tables

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

2 Bill of Materials............................................................................................................... 6

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

4 Circuit Module to EV2300/EV2400 Connections – I2C.................................................................. 9

Impedance Track is a trademark of Texas Instruments.

I2C is a trademark of NXP.

SLUUB83–May 2015 bq27546EVM Single-Cell Impedance Track™ Technology Evaluation Module

Features

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5 Circuit Module to EV2300/EV2400 Connections – HDQ ............................................................... 9

1 Features

• Complete evaluation system for the bq27546 gas gauge with Impedance Track™ Technology

• Populated circuit module for quick setup

• PC software (available at power.ti.com) and interface board for easy evaluation

• Software that allows data logging for system analysis

1.1 Kit Contents

• bq27546 circuit module

1.2 Ordering Information

Table 1. Ordering Information

EVM PART NUMBER CHEMISTRY CONFIGURATION CAPACITY

bq27546EVM-702 Li-ion 1 cell ≤14, 500 mAh

2 bq27546-Based Circuit Module

The bq27546-based circuit module is a complete and compact example solution of a bq27546 circuit for

battery management. The circuit module incorporates a bq27546 battery gas gauge IC, and all other

components necessary to 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 cells: CELL+ and CELL-

• To the serial communications ports (SDA, SCL) or HDQ

• The system load and charger connect across PACK+ and PACK-

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bq27546-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

SDA I2C™ communication data line

SCL I2C communication clock line

HDQ Single wire communication line

3 bq27546 Circuit Module Schematic

This section contains schematic information.

3.1 Schematic

The schematic follows the bill of materials in this user's guide.

4 Circuit Module Physical Layouts and Bill of Materials

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

the bq27546 circuit module.

4.1 Board Layout

This section shows the PCB layers (Figure 1 through Figure 4), and assembly drawing for the bq27546

module.

Figure 1. bq27546EVM Layout, Silkscreen

SLUUB83–May 2015 bq27546EVM Single-Cell Impedance Track™ Technology Evaluation Module

Circuit Module Physical Layouts and Bill of Materials

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Figure 2. Top Assembly

Figure 3. Top Layer

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Circuit Module Physical Layouts and Bill of Materials

Layer 2

Layer 3

Figure 4. Bottom Layer

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Circuit Module Physical Layouts and Bill of Materials

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4.2 Bill of Materials and Schematic

Table 2. Bill of Materials

Alternate Alternate

Designator Quantity Value Description PackageReference PartNumber Manufacturer PartNumber Manufacturer

C1 1 0.47uF CAP, CERM, 0.47 µF, 16 V, +/- 10%, 0402 GRM155R61C474KE01 MuRata

X5R, 0402

C2, C3, C4, 5 0.1uF CAP, CERM, 0.1 µF, 10 V, +/- 10%, X5R, 0402 GRM155R61A104KA01D MuRata

C6, C7 0402

C5 1 1uF CAP, CERM, 1 µF, 16 V, +/- 10%, X5R, 0402 C1005X5R1C105K050BC TDK

0402

D1, D2 2 5.1V Diode, Zener, 5.1 V, 300 mW, SOT-23 SOT-23 AZ23C5V1-7-F Diodes Inc.

J1, J3, J4 3 Header, 100mil, 2x1, Tin, TH Header, 2 PIN, 100mil, PEC02SAAN Sullins Connector

Tin Solutions

J2, J5 2 Header (friction lock), 100mil, 4x1, R/A, 4x1 R/A Header 22-05-3041 Molex

J6 1 Header, 100mil, 3x1, Tin, TH Header, 3 PIN, 100mil, PEC03SAAN Sullins Connector

Tin Solutions

R1 1 4.7k RES, 4.7 k, 5%, 0.063 W, 0402 0402 CRCW04024K70JNED Vishay-Dale

R2, R3, R6, 8 100 RES, 100, 5%, 0.063 W, 0402 0402 CRCW0402100RJNED Vishay-Dale

R7, R8, R9,

R10, R11

R4, R5 2 10k RES, 10 k, 5%, 0.063 W, 0402 0402 CRCW040210K0JNED Vishay-Dale

R12 1 0.01 RES, 0.01, 1%, 0.25 W, 0805 0805 WSL0805R0100FEA18 Vishay-Dale

RT1 1 10.0k ohm Thermistor NTC, 10.0k ohm, 1%, Disc, Disc, 5x8.4 mm 103AT-2 SEMITEC Corporation

5x8.4 mm

SH-J1, SH-J3, 4 1x2 Shunt, 100mil, Flash Gold, Black Closed Top 100mil SPC02SYAN Sullins Connector

SH-J4, SH-J6 Shunt Solutions

TB1, TB2 2 Terminal Block, 6A, 3.5mm Pitch, 2-Pos, 7.0x8.2x6.5mm ED555/2DS On-Shore Technology

TP1, TP2, TP3, 8 SMT Test Point, Miniature, SMT Testpoint_Keystone_Mi 5015 Keystone

TP4, TP5, TP6, niature

TP7, TP8

U1 1 Single Cell Li-Ion Battery Fuel Gauge for YZF0015BBBP BQ27546YZFR-G1 Texas Instruments BQ27546YZFT-G1 Texas Instruments

Battery Pack Integration, YZF0015BBBP

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0.1μF

5.1V

AZ23C5V1-7-F

5.1V

AZ23C5V1-7-F

100

R10

100

R11

100

4.7k

10k

0.01

R12

10.0k ohm

t°

RT1

TB2 1

TB1

TP8

TP5

TP7

TP1

TP3

TP4

TP2

TP6

NC E3

NC D3

SDA B3

SCL A3

BAT

D2 TS B2

HDQ A2

SRP

SRN

VSS

VCC D1

REGIN

BQ27546YZFR-G1

GND

10k

GND

VCC

0.47μF

1 Fμ

GND

NT1

Net-Tie

Vin Max: 5V

Current Max: 3A

CELL+

CELL-

CELL+

CELL-

Place C2 close to REGIN pin

Place C3 close to BAT pin

OFF

Ext Thermistor

TS VCC

Place R10, R11, C4, C6, C7

Close to GG

HDQ

VSS

SDA

SCL

VSS

PACK+/Load+

PACK-/Load-

PACK-

PACK+

0.1μF

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Circuit Module Physical Layouts and Bill of Materials

Figure 5. Schematic

SLUUB83–May 2015 bq27546EVM Single-Cell Impedance Track™ Technology Evaluation Module

Circuit Module Physical Layouts and Bill of Materials

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4.3 bq27546 Circuit Module Performance Specification Summary

This section summarizes the performance specifications of the bq27546 circuit module.

Table 3. Performance Specification Summary

Specification Min Typ Max Units

Input voltage Pack+ to Pack– 2.7 3.6 5 V

Input voltage CELL+ to CELL- 2.7 3.6 5 V

Charge and discharge current 0 1 2 A

5 EVM Hardware and Software Setup

This section describes how to install the bq27546 PC software, and how to connect the different

components of the EVM.

5.1 Software Installation

Find the latest software version in the bq27546 tool folder on www.ti.com. Make a search by Products for

bq27546 to access the product folder. Use the following steps to install Battery Management Studio.

5.1.1 Using EV2300

Use the following steps to install the bq27546EVSW software when using EV2300:

1. Ensure that the EV2300/EV2400 is not connected to the PC through a USB cable before starting this

procedure.

2. Select the Tool and Software tab in the product folder.

3. Under the Software section click on Battery Management Studio (bqStudio) Software Suite, or click the

link.

4. Click the Download button to download the software.

5. Download software to hard drive.

6. Double-click the software executable and follow all instructions and prompts.

5.1.2 Using EV2400

Use the following steps to install the bq27546EVSW software when using EV2400:

1. Ensure that the EV2400 is not connected to the PC through a USB cable before starting this

procedure.

2. Browse for the supported software link within the bq27546 TI web site product folder to find the

downloadable EVSW installation files.

3. Open the software file that was downloaded from the TI web site.

4. Follow the instructions on screen until the software installation is completed.

5. Before starting the EVSW, connect the EV2400 to the computer using the USB cable.

6. Wait for 20 seconds or until windows installs the driver.

6 Troubleshooting Unexpected Dialog Boxes

The user that 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 policy.

7 Hardware Connection

The bq27546EVM comprises three hardware components: the bq27546 circuit module, the

EV2300/EV2400 PC interface board, and the PC.

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Hardware Connection

7.1 Connecting the bq27546 Circuit Module to a Battery Cell

Figure 6 shows how to connect the bq27546 circuit module to the cell and system load or charger.

Figure 6. bq27546 Circuit Module Connection to Cell and System Load or Charger

7.2 PC Interface Connection

The bq27546 can be configured as an HDQ communication device or left in default as an I2C device.

Once the bq27546 is configured for HDQ communication, it cannot be reverted to I2C mode. Refer to

chapter 12 of this document for information on configuring the bq27546 to HDQ mode.

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

1. Connect the bq27546-based pack to the EV2300/EV2400 using wire leads as shown in Table 4.

Table 4. Circuit Module to EV2300/EV2400 Connections – I2C

bq27546-Based Battery EV2300 (I2C port) EV2400 (Port 2, I2C)

(I2C mode)

SDA SDA 3 SDA 2.3

SCL SCL 2 SCL 2.2

VSS GND 1 VSS 2.1

Table 5. Circuit Module to EV2300/EV2400 Connections – HDQ

bq27546-Based Battery EV2300 (HDQ port) EV2400 (Port 3, HDQ)

(HDQ mode)

HDQ HDQ 3 SDA 3.3

VSS GND 1 VSS 3.1

2. Connect the PC USB cable to the EV2300/EV2400 and the PC USB port.

The bq27546EVM is now set up for operation.

SLUUB83–May 2015 bq27546EVM Single-Cell Impedance Track™ Technology Evaluation Module

Operation

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8 Operation

This section details the operation of the bq27546 evaluation software.

8.1 Starting the Program

Run bqStudio from the Start | All Programs | Texas Instruments | Battery Management Studio. The main

screen (Figure 7) appears. Data begins to appear once the <Refresh> (single-time scan) button is clicked,

or when the Scan button is clicked. To disable the scan feature, simply click the Scan button again.

The continuous scanning period can be set by opening Window | Preferences →Registers section. The

range for this interval is 0 ms to 65,535 ms. Only items that are selected for scanning are scanned within

this period.

Battery Management Studio provides a logging function which logs the values that were last scanned. To

enable this function, select the Start Log button; this causes the Scan button to be pressed. When logging

is Stopped, the Scan button will still be selected and has to be manually clicked again.

Figure 7. Registers Screen

This screen (Figure 7) shows the RAM data in the bq27546 device. Additional Flag and Status data can

be viewed at the bottom of the Registers screen.

8.2 Setting Programmable bq27546 Options

The bq27546 data memory comes configured per the default settings detailed in the bq27546 technical

reference manual (SLUUB74). Ensure that the settings are correctly changed to match the pack and

application for the bq27546 solution being evaluated.

IMPORTANT: The correct setting of these options is essential to get the best performance.

The settings can be configured using the Data Memory screen (Figure 8).

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