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User's Guide

SLUUA63–April 2013

bq27421 EVM: Single-Cell Impedance Track Technology

This evaluation module (EVM) is a complete evaluation system for the bq27421. The EVM includes one

bq27421 circuit module with an integrated current-sense resistor. A separated orderable EV2300 or

EV2400 PC interface board for gas gauge interface along with a PC USB cable, and Windows

-based PC

software is needed when using this EVM. The circuit module includes one bq27421 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 or EV2400

interface board and software, the user can:

• Read the bq27421 data registers

• Update the RAM for different configurations

• Log cycling data for further evaluation

• Evaluate the overall functionality of the bq27421 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 bq27421-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 Material ...................................................................................................... 7

3.3 Schematic ........................................................................................................... 7

3.4 bq27421 Circuits Module Performance Specification Summary ............................................. 7

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

4.1 System Requirements ............................................................................................. 8

4.2 Software Installation ............................................................................................... 8

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

6 Hardware Connection ...................................................................................................... 8

6.1 Connecting the bq27421 Circuit Module to a Battery Pack .................................................. 8

6.2 PC Interface Connection .......................................................................................... 9

7 Operation ..................................................................................................................... 9

7.1 Starting the Program .............................................................................................. 9

7.2 Setting Programmable bq27421 Options ...................................................................... 11

8 Calibrate Screen ........................................................................................................... 12

8.1 To Calibrate the bq27421 ....................................................................................... 12

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

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

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

List of Figures

Windows, Microsoft are registered trademarks of Microsoft Corporation.

C is a trademark of NXP.

SLUUA63–April 2013 bq27421 EVM: Single-Cell Impedance Track Technology

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Summary of content (18 pages)

PAGE 1
User's Guide SLUUA63 – April 2013 bq27421 EVM: Single-Cell Impedance Track Technology This evaluation module (EVM) is a complete evaluation system for the bq27421. The EVM includes one bq27421 circuit module with an integrated current-sense resistor. A separated orderable EV2300 or EV2400 PC interface board for gas gauge interface along with a PC USB cable, and Windows®-based PC software is needed when using this EVM.
PAGE 2
Features www.ti.com 1 bq27421EVM Layout – Top Silk .......................................................................................... 4 2 bq27421EVM Layout - Top Layer 3 bq27421EVM Layout - Power Layer 4 5 6 7 8 9 10 ........................................................................................ ..................................................................................... bq27421EVM Layout – Bottom Layer ......................................................................
PAGE 3
bq27421-Based Circuit Module www.ti.com 2 bq27421-Based Circuit Module The bq27421-based circuit module is a complete and compact example solution of a bq27421 circuit for battery management. The circuit module incorporates a bq27421 battery gas gauge integrated circuit (IC) with integrated sense resistor and all other components necessary to accurately predict the capacity of a 1-series Li-ion cell. 2.
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Circuit Module Physical Layout, Bill of Materials and Schematic www.ti.com Figure 1. bq27421EVM Layout – Top Silk Figure 2.
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www.ti.com Circuit Module Physical Layout, Bill of Materials and Schematic Figure 3. bq27421EVM Layout - Power Layer Figure 4.
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Circuit Module Physical Layout, Bill of Materials and Schematic www.ti.com Figure 5.
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Circuit Module Physical Layout, Bill of Materials and Schematic www.ti.com 3.2 Bill of Material Table 2. Bill of Materials Count RefDes Value Description Size 1 C1 0.47uF Capacitor, Ceramic, 10V, X5R, 10% 0402 Part Number Mfr 1 C2 1uF Capacitor, Ceramic, 6.3V, X5R, 10% 0402 4 J1, J4, J6, J7 ED555/2DS Terminal Block, 2-pin, 6-A, 3.5mm 0.27 x 0.25 inch ED555/2DS OST 4 J2, J3, J8, J9 PEC36SAAN Header, Male 3-pin, 100mil spacing 0.
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EVM Hardware and Software Setup www.ti.com Table 3. Performance Specification Summary 4 Specification Min Typ Max Units Input voltage Pack+ to Pack– 2.7 3.6 4.3 V Charge and discharge current 0 1 2.5 A EVM Hardware and Software Setup This section describes how to install the bq27421EVM PC software and how to connect the different components of the EVM. 4.1 System Requirements The GaugeStudio software requires Windows XP or later.
PAGE 9
Operation USB EV2300 or EV2400 CHARGER SMB I2C HDQ www.ti.com LOAD Battery Pack Figure 7. bq27421 Circuit Module Connection to Pack and System Load/Charger 6.2 PC Interface Connection The following steps configure the hardware for interface to the PC. 1. Connect the bq27421-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.
PAGE 10
Operation www.ti.com GaugeStudio provides a logging function which logs selected Data Registers and Data Memory values last received from the bq27421. To enable this function, click the DataLog icon in the Tools panel. The DataLog window will appear below the Registers and Data Memory windows.
PAGE 11
Operation www.ti.com 7.2 Setting Programmable bq27421 Options The bq27421 OTP comes configured per the default settings detailed in the bq27421 data sheet. Ensure that the settings are correctly changed to match the pack and application for the bq27421 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 window seen in the main GaugeStudio window (Figure 9). Figure 9.
PAGE 12
Calibrate Screen www.ti.com The OTP configuration can be saved to a file by clicking the Export button in the Data Memory window and entering a file name. The OTP configuration will be saved to a *.gg file. The module calibration data is also held in the bq27421 data Memory. If the Gauge Dashboard is not displaying any information, then the bq27421 may not be supported by the GaugeStudio version that is being used. A GaugeStudio upgrade may be required.
PAGE 13
Related Documentation from Texas Instruments www.ti.com Figure 10. Calibration Screen 9 Related Documentation from Texas Instruments To obtain a copy of any of the following TI documents, call the Texas Instruments 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 also can be obtained through the TI Web site at www.ti.com . 1.
PAGE 14
EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions: The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods.
PAGE 15
FCC Interference Statement for Class B EVM devices This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
PAGE 16
【Important Notice for Users of this Product in Japan】】 This development kit is NOT certified as Confirming to Technical Regulations of Radio Law of Japan If you use this product in Japan, you are required by Radio Law of Japan to follow the instructions below with respect to this product: 1. 2. 3. Use this product in a shielded room or any other test facility as defined in the notification #173 issued by Ministry of Internal Affairs and Communications on March 28, 2006, based on Sub-section 1.
PAGE 17
EVALUATION BOARD/KIT/MODULE (EVM) WARNINGS, RESTRICTIONS AND DISCLAIMERS For Feasibility Evaluation Only, in Laboratory/Development Environments. Unless otherwise indicated, this EVM is not a finished electrical equipment and not intended for consumer use.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.