National Semiconductor Bq27411 User manual

SLUUAP3A–January 2014–Revised July 2016

bq27411 EVM: System-Side Impedance Track™ Technology

Impedance Track is a trademark of Texas Instruments.

Microsoft, Windows are registered trademarks of Microsoft Corporation.

User's Guide

SLUUAP3A–January 2014–Revised July 2016

bq27411 EVM: System-Side Impedance Track™

Technology

This evaluation module (EVM) is a complete evaluation system for the bq27411 fuel gauge. The EVM

includes one bq27411 circuit module with a current-sense resistor. A separate orderable EV2300 or

EV2400 PC interface board for fuel gauge interface along with a PC USB cable, and Microsoft®Windows®

based PC software is needed when using this EVM. The circuit module includes one bq27411 integrated

circuit and all other onboard components necessary to monitor and predict capacity for a pack-side fuel

gauge solution. The circuit module connects directly across the battery cell. With the EV2300 or EV2400

interface board and software, the user can:

• Read the bq27411 data registers

• Update the RAM for different configurations

• Log cycling data for further evaluation

• Evaluate the overall functionality of the bq27411 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

1.1 Kit Contents.......................................................................................................... 2

1.2 Ordering Information ............................................................................................... 2

2 bq27411-Based Circuit Module ............................................................................................ 3

2.1 Circuit Module Connections ....................................................................................... 3

2.2 Pin Description...................................................................................................... 3

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

3.1 Board Layout ........................................................................................................ 3

3.2 Bill of Materials...................................................................................................... 5

3.3 Schematic............................................................................................................ 6

3.4 bq27411 Circuits Module Performance Specification Summary.............................................. 6

4 EVM Hardware and Software Setup ...................................................................................... 6

4.1 Software Installation................................................................................................ 7

5 Troubleshooting Unexpected Dialog Boxes.............................................................................. 7

6 Hardware Connection ....................................................................................................... 7

6.1 Connecting the bq27411 Circuit Module to a Battery Pack ................................................... 7

6.2 PC Interface Connection........................................................................................... 8

7 Operation ..................................................................................................................... 8

7.1 Starting the Program ............................................................................................... 8

7.2 Setting Programmable bq27411 Options ...................................................................... 10

8 Calibration................................................................................................................... 12

8.1 Calibrating the bq27411 ......................................................................................... 12

8.2 Voltage Calibration................................................................................................ 12

8.3 Board Offset Calibration.......................................................................................... 12

9 Related Documentation from Texas Instruments ...................................................................... 13

List of Figures

Features

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bq27411 EVM: System-Side Impedance Track™ Technology

1 bq27411EVM Layout – Top Silk........................................................................................... 3

2 bq27411EVM Layout - Top Layer ........................................................................................ 4

3 bq27411EVM Layout – Bottom Layer..................................................................................... 4

4 bq27411EVM Schematic ................................................................................................... 6

5 bq27411 Circuit Module Connection to Pack and System Load/Charger............................................ 7

6 Registers Screen ............................................................................................................ 9

7 bqStudio Default Page..................................................................................................... 10

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

9 Calibration Screen.......................................................................................................... 12

List of Tables

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

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

3 Performance Specification Summary ..................................................................................... 6

4 Circuit Module to EV2300 or EV2400 Connections ..................................................................... 8

1 Features

• Complete evaluation system for the bq27411 gas 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

1.1 Kit Contents

• bq27411 circuit module (PWR544)

This EVM is used for the evaluation of bq27411 fuel gauge. Visit the product Web folder at www.ti.com to

properly configure the bq27411 fuel gauge.

1.2 Ordering Information

(1) Using the FW_VERSION (0x0002) Control() subcommand returns 0x0109. See SLUSBN7,bq27411-G1x System-Side

Impedance Track™ Fuel Gauge, data sheet for information on Control() subcommands.

(2) Using the CHEM_ID (0x0008) Control() subcommand helps to differentiate between the bq27411-G1A (returns 0x0128), the

bq27411-G1B (returns 0x0312), and the bq27411-G1C (returns 0x0354). See SLUSBN7,bq27411-G1x System-Side Impedance

Track™ Fuel Gauge, data sheet for information on Control() subcommands.

Table 1. Ordering Information

Part Number EVM Part Number Firmware Version (1) Chemistry Chemistry ID (2) Configuration

bq27411-G1A bq27411EVM-G1A v1.09 (0x0109) 4.2 V Li-ion 128 1 cell

bq27411-G1B bq27411EVM-G1B v1.09 (0x0109) 4.3 V Li-ion 312 1 cell

bq27411-G1C bq27411EVM-G1C v1.09 (0x0109) 4.35 V Li-ion 354 1 cell

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bq27411-Based Circuit Module

SLUUAP3A–January 2014–Revised July 2016

bq27411 EVM: System-Side Impedance Track™ Technology

2 bq27411-Based Circuit Module

The bq27411-based circuit module is a complete and compact example solution of a bq27411 circuit for

battery management. The circuit module incorporates a bq27411 battery fuel gauge integrated circuit (IC)

with 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 battery cell (J1): CELL+, CELL–

• The serial communications port (J3): SDA, SCL, and VSS

• The load and charger connect across pack connector (J2): PACKP and PACKN

• Access to the programming pin (J7): EXTPROG and VSS

• External connect to I2C pullup voltage (J4): EXTPU and VSS

2.2 Pin Description

Pin Name Description

PACK+ Charger/load positive terminal

PACK– Charger/load negative terminal

SDA I2C communication data line

EXTPU External I2C pullup connection

SCL I2C communication clock line

VSS Signal return for communication line, shared with charger and ground

CELLP Cell positive terminal

CELLN Cell negative terminal

EXTPROG Power connection for OTP programming

3 Circuit Module Physical Layout, Bill of Materials and Schematic

This section contains the board layout, bill of materials, and schematic for the bq27411 circuit module.

3.1 Board Layout

This section shows the printed-circuit board (PCB) layers (Figure 1 through Figure 3), and assembly

drawing for the bq27411 module.

Figure 1. bq27411EVM Layout – Top Silk

Circuit Module Physical Layout, Bill of Materials and Schematic

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Figure 2. bq27411EVM Layout - Top Layer

Figure 3. bq27411EVM Layout – Bottom Layer

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Circuit Module Physical Layout, Bill of Materials and Schematic

SLUUAP3A–January 2014–Revised July 2016

bq27411 EVM: System-Side Impedance Track™ Technology

3.2 Bill of Materials

Table 2. Bill of Materials

Designator Quantity Value Description Package

Reference Part Number Manufacturer

PCB 1 Printed Circuit Board PWR544 Any

C1 1 0.47 µF Capacitor, Ceramic Chip, 10V, X5R, ±10% 402 C1005X5R1A474K050BB TDK

C2 1 1.0 µF Capacitor, Ceramic Chip, 16V, X5R, ±10% 402 C1005X5R1C105K050BC TDK

C3 1 1 µF Capacitor, CERM, 1µF, 10V, ±10%, X5R, 0402 0402 GRM155R61A105KE15D MuRata

C4, C5 2 150 pF Capacitor, CERM, 150pF, 50V, ±5%, C0G/NP0,

0402 0402 GRM1555C1H151JA01D MuRata

D1 1 Red LED, Red, SMD LED_0805 LTST-C170KRKT Lite-On

J1, J2, J4,

J7 4 ED555/2DS Terminal Block, 2-pin, 6-A, 3.5mm 0.27 x 0.25

inch ED555/2DS OST

J3 1 22-05-3041 Header, Friction Lock Ass'y, 4-pin Right Angle 0.400 x

0.500 inch 22-05-3041 Molex

J5, J6 2 PEC03SAAN Header, Male 3-pin, 100mil spacing 0.100 inch x

3PEC03SAAN Sullins

J8 1 PEC02SAAN Header, Male 2-pin, 100mil spacing 0.100 inch x

2PEC02SAAN Sullins

LBL1 1 Thermal Transfer Printable Labels,

0.650" W x 0.200" H

10,000 per roll

PCB Label

0.650"H x

0.200"W

THT-14-423-10 Brady

R1 1 0.010 Resistor, Power Metal Strip, 0.25W, 1% 805 WSL0805R0100FEA1 Vishay

R2, R3 2 5.1 kΩResistor, 5.1 kΩ, 5%, 0.063W, 0402 0402 CRCW04025K10JNED Vishay-Dale

R4, R6, R9 3 1.00 MΩResistor, 1.00 MΩ, 1%, 0.063W, 0402 0402 CRCW04021M00FKED Vishay-Dale

R5 1 510 Resistor, 510 Ω, 5%, 0.063W, 0402 0402 CRCW0402510RJNED Vishay-Dale

R7, R8 2 300 Resistor, 300 Ω, 5%, 0.063W, 0402 0402 CRCW0402300RJNED Vishay-Dale

R10, R11 2 100 Resistor, 100 Ω, 1%, 0.063W, 0402 0402 CRCW0402100RFKED Vishay-Dale

SH-J5,

SH-J6,

SH-J8

3 1x2 Shunt, 100mil, Gold plated, Black Shunt 969102-0000-DA 3M

TP1, TP5,

TP11 3 5001 Test Point, Black, Thru Hole Color Keyed 0.100 x

0.100 inch 5001 Keystone

TP2, TP4,

TP6, TP9,

TP10

5 5000 Test Point, Red, Thru Hole Color Keyed 0.100 x

0.100 inch 5000 Keystone

TP3, TP7,

TP8 3 5002 Test Point, White, Thru Hole Color Keyed 0.100 x

0.100 inch 5002 Keystone

U1 1 BQ27411DRZ-

G1x IC, Single-Cell Impedance Track Gas Gauge QFN12 BQ27411DRZ-G1x TI

TP9

VSS

VDD

PGND

VDD

PROG

EXTPU

TP3

TEST

TP7

TP8

SDA

SCL

SDA

SCL

VSS

VDD

BAT

6SRN 7

SRP 8

NC 9

TEST 10

NC 11

PROG 12

PWPD

BQ27411DRZ

ENABLE

SDA

TP11

SCL

PROG

VSS

PGND

VDD

TP4

VDD

0.47uF

PGND PGND

TP10

TP6TP2

0.010

CELLP

PACKN

1.0uF

CELLN

TP5TP1

PGND

100

R10

510

5.1k

1.00Meg

CELLP

VSS VSS VSS

PACKP

PGND

1µF

PGND

Red

PGND

Optional: Requires ~20mA Extra Supply Current.

VDD

EXTPU

VDD

PGND

SDA

SCL

VOUT

Optional ESD Filter

VSS

EXTPROG

100

R11

300

1.00Meg

150pF

PGNDPGND

EXTPU

1.00Meg

Circuit Module Physical Layout, Bill of Materials and Schematic

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3.3 Schematic

Figure 4. bq27411EVM Schematic

3.4 bq27411 Circuits Module Performance Specification Summary

Table 3 summarizes the performance specifications of the bq27411 circuit module.

Table 3. Performance Specification Summary

Specification Min Typ Max Unit

Input voltage Pack+ to Pack– 2.7 3.6 5 V

Charge and discharge current 0 1 6 A

4 EVM Hardware and Software Setup

This section describes how to install the bq27411EVM PC software and how to connect the different

components of the EVM.

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EVM Hardware and Software Setup

SLUUAP3A–January 2014–Revised July 2016

bq27411 EVM: System-Side Impedance Track™ Technology

4.1 Software Installation

Find the latest software version at http://www.ti.com/tool/bqStudio. Use the following steps to install

Battery Management Studio:

1. Ensure that the EV2300 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.

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 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. If using Windows 7,

install the software with administrator privileges.

6 Hardware Connection

The bq27411 evaluation system comprises three hardware components: the bq27411 circuit module, the

EV2300 or EV2400 PC interface board, and the PC.

6.1 Connecting the bq27411 Circuit Module to a Battery Pack

Figure 5 shows how to connect the bq27411 circuit module to the cells and system load/charger.

Figure 5. bq27411 Circuit Module Connection to Pack and System Load/Charger

Hardware Connection

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6.2 PC Interface Connection

The following steps configure the hardware for interface to the PC.

1. Connect the bq27411-based EVM to the EV2300 or EV2400 using wire leads as shown in Table 4.

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

Table 4. Circuit Module to EV2300 or EV2400 Connections

bq27411EVM EV2300 or EV2400

SDA SDA

SCL SCL

VSS GND/VSS

The bq27411EVM is now set up for operation.

7 Operation

This section details the operation of the bqStudio software.

7.1 Starting the Program

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

screen (Figure 6) appears. If instead of Figure 6 appearing, Figure 7 appears, it may mean that the EVM

is not connected to the computer correctly. Make sure that the USB interface (EV2300 or EV2400 or GDK)

and the bq27411 are connected and restart bqStudio. If this still does not resolve the issue, check if the

I2C pullup resistors are connected. 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.

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Operation

SLUUAP3A–January 2014–Revised July 2016

bq27411 EVM: System-Side Impedance Track™ Technology

Figure 6. Registers Screen

This screen (Figure 6) shows the RAM data in the bq27411 device. Additional Flags and Status data can

be viewed at the bottom of the Registers screen.

Operation

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Figure 7. bqStudio Default Page

7.2 Setting Programmable bq27411 Options

The bq27411 data memory comes configured per the default settings detailed in the bq27411 technical

reference manual (SLUUAS7). Ensure that the settings are correctly changed to match the pack and

application for the bq27411 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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