Texas Instruments bq27425EVM User Manual
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Texas Instruments bq27425EVM User Manual

Single-cell impedance track technology
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bq27425 EVM: Single-Cell Impedance Track Technology
This evaluation module (EVM) is a complete evaluation system for the bq27425. The EVM includes one
bq27425 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 bq27425 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:
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Read the bq27425 data registers
•
Program the chipset for different configurations
•
Log cycling data for further evaluation
•
Evaluate the overall functionality of the bq27425 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.
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SLUU656 - October 2011
Submit Documentation Feedback
This datasheet has been downloaded from
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Copyright © 2011, Texas Instruments Incorporated
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bq27425 EVM: Single-Cell Impedance Track Technology
http://www.digchip.com
User's Guide
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Summary of Contents for Texas Instruments bq27425EVM

  • Page 1: Table Of Contents

    Coulomb Counter Offset Calibration ..................Board Offset Calibration ....................Voltage Calibration ..................Temperature Calibration SLUU656 – October 2011 bq27425 EVM: Single-Cell Impedance Track Technology Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated This datasheet has been downloaded from http://www.digchip.com at this page...

  • Page 2: Contents 1 Features

    Features www.ti.com ..................Pack Current Calibration ..............Related Documentation from Texas Instruments List of Figures ..................bq27425EVM Layout – Top Silk ................... bq27425EVM Layout – Top Assembly ..................bq27425EVM Layout – Top Layer ..................bq27425EVM Layout – Bottom Layer ....................

  • Page 3: Bq27425-Based Circuit Module

    Board Layout This section shows the printed-circuit board (PCB) layers (Figure 1 through Figure 4), and assembly drawing for the bq27425 module. SLUU656 – October 2011 bq27425 EVM: Single-Cell Impedance Track Technology Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated...

  • Page 4: Bq27425Evm Layout - Top Silk

    Circuits Module Physical Layout and Bill of Material www.ti.com Figure 1. bq27425EVM Layout – Top Silk Figure 2. bq27425EVM Layout – Top Assembly SLUU656 – October 2011 bq27425 EVM: Single-Cell Impedance Track Technology Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated...

  • Page 5: Bq27425Evm Layout - Top Layer

    Circuits Module Physical Layout and Bill of Material www.ti.com Figure 3. bq27425EVM Layout – Top Layer Figure 4. bq27425EVM Layout – Bottom Layer SLUU656 – October 2011 bq27425 EVM: Single-Cell Impedance Track Technology Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated...

  • Page 6: Bill Of Material

    Figure 5. bq27425EVM Schematic bq27425 Circuits Module Performance Specification Summary This section summarizes the performance specifications of the bq27425 circuit module. SLUU656 – October 2011 bq27425 EVM: Single-Cell Impedance Track Technology Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated...

  • Page 7: Evm Hardware And Software Setup

    Input voltage Pack+ to Pack– Charge and discharge current EVM Hardware and Software Setup This section describes how to install the bq27425EVM PC software and how to connect the different components of the EVM. System Requirements The bq27425EVSW software requires Windows 2000 or Windows XP. Drivers for Windows 98SE are provided, but Microsoft™...

  • Page 8: Pc Interface Connection

    Operation This section details the operation of the bq27425 EVSW software. Starting the Program Run bq27425 EVSW from the Start | Programs | Texas Instruments | bq Evaluation Software menu sequence. The DataRAM screen (Figure 7) appears. Data begins to appear once the <Refresh> (single time scan) button is clicked, or when the <Keep Scanning>...

  • Page 9: Setting Programmable Bq27425 Options

    IMPORTANT: The correct setting of these options is essential to get the best performance. The settings can be configured using the Data Flash screen (Figure SLUU656 – October 2011 bq27425 EVM: Single-Cell Impedance Track Technology Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated...

  • Page 10: Data Flash Screen

    When a check is next to | AutoExport |, the AutoExport is in progress. The same menu selection is used to turn on/off AutoExport. SLUU656 – October 2011 bq27425 EVM: Single-Cell Impedance Track Technology Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated...

  • Page 11: Calibrate Screen

    2. Measure the current and type value into Enter Actual Current using (–) for current in discharge direction. 3. Press the Calibrate Pack Current as indicated below button. SLUU656 – October 2011 bq27425 EVM: Single-Cell Impedance Track Technology Submit Documentation Feedback Copyright © 2011, Texas Instruments Incorporated...

  • Page 12: Related Documentation From Texas Instruments

    Figure 9. Calibration Screen 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.
  • Page 13 Evaluation Board/Kit Important Notice Texas Instruments (TI) provides the enclosed product(s) under the following conditions: This evaluation board/kit is intended for use for ENGINEERING DEVELOPMENT, DEMONSTRATION, OR EVALUATION PURPOSES ONLY and is not considered by TI to be a finished end-product fit for general consumer use. Persons handling the product(s) must have electronics training and observe good engineering practice standards.
  • Page 14 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.

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