Texas Instruments bq27421 User Manual
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Texas Instruments bq27421 User Manual

Texas Instruments bq27421 User Manual

Evm: single-cell impedance track technology
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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 Microsoft
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:
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Read the bq27421 data registers
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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.
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Microsoft, Windows are registered trademarks of Microsoft Corporation.
All other trademarks are the property of their respective owners.
SLUUA63A - April 2013 - Revised July 2016
Submit Documentation Feedback
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Copyright © 2013-2016, Texas Instruments Incorporated
SLUUA63A - April 2013 - Revised July 2016
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bq27421 EVM: Single-Cell Impedance Track Technology
User's Guide
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  • Page 1: Table Of Contents

    SLUUA63A – April 2013 – Revised July 2016 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...

  • Page 2: Contents 1 Features

    (0x0108) 4.3/4.35 V Li-ion 1 cell Using the FW_VERSION (0x0002) Control() Subcommand returns 0x0108. See the bq27421-G1x data sheet for information on Control() Subcommands. Using the CHEM_ID (0x0008) Control() Subcommand helps differentiate between the bq27425-G1A (returns 0x0128) and the bq27421-G1B (returns 0x0312).

  • Page 3: Bq27421-Based Circuit Module

    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.

  • Page 4: Circuit Module Physical Layout, Bill Of Materials And Schematic

    Circuit Module Physical Layout, Bill of Materials and Schematic www.ti.com Circuit Module Physical Layout, Bill of Materials and Schematic This section contains the board layout, bill of materials, and schematic for the bq27421 circuit module. Board Layout This section shows the printed-circuit board (PCB) layers...

  • Page 5: Bq27421Evm Layout - Power Layer

    Circuit Module Physical Layout, Bill of Materials and Schematic www.ti.com Figure 3. bq27421EVM Layout - Power Layer Figure 4. bq27421EVM Layout – Bottom Layer SLUUA63A – April 2013 – Revised July 2016 bq27421 EVM: Single-Cell Impedance Track Technology Submit Documentation Feedback Copyright © 2013–2016, Texas Instruments Incorporated...

  • Page 6: Bq27421Evm Layout - Ground Layer

    Circuit Module Physical Layout, Bill of Materials and Schematic www.ti.com Figure 5. bq27421EVM Layout – Ground Layer bq27421 EVM: Single-Cell Impedance Track Technology SLUUA63A – April 2013 – Revised July 2016 Submit Documentation Feedback Copyright © 2013–2016, Texas Instruments Incorporated...

  • Page 7: Bill Of Material

    Pack- TP10 0.47uF Load+ BQ27421YZF Load+(Host) Charger+ Application circuit only needs to include bq27421 and C1 Charger- Load-(Host) Load- Figure 6. bq27421EVM Schematic SLUUA63A – April 2013 – Revised July 2016 bq27421 EVM: Single-Cell Impedance Track Technology Submit Documentation Feedback...

  • Page 8: Bq27421 Circuits Module Performance Specification Summary

    Circuit Module Physical Layout, Bill of Materials and Schematic www.ti.com bq27421 Circuits Module Performance Specification Summary This section summarizes the performance specifications of the bq27421 circuit module. Table 3. Performance Specification Summary Specification Units Input voltage Pack+ to Pack– Charge and discharge current...

  • Page 9: Hardware Connection

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

  • Page 10: Operation

    Make sure that the USB interface (EV2300 or EV2400 or GDK) and the bq27421 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.

  • Page 11: Setting Programmable Bq27421 Options

    Figure 9. bqStudio Default Page Setting Programmable bq27421 Options The bq27421 data memory comes configured per the default settings detailed in the bq27421 technical reference manual (SLUUAC5). Ensure that the settings are correctly changed to match the pack and application for the bq27421 solution being evaluated.

  • Page 12: Data Memory Screen

    Figure 10. Data Memory Screen To read all the data from the bq27421 non-volatile flash memory, click on the Read All button on the Data Memory window. Make sure the device is not sealed and in full access to read or write to the data memory.

  • Page 13: Calibration

    1. Remove load and short PACK– to LOAD–. 2. Press the Calibrate button. Figure 11. Calibration Screen SLUUA63A – April 2013 – Revised July 2016 bq27421 EVM: Single-Cell Impedance Track Technology Submit Documentation Feedback Copyright © 2013–2016, Texas Instruments Incorporated...

  • Page 14: Advanced Communication I

    C read/write operations are not specific to any gas gauge. These operations serve as general-purpose communication tools (Figure 12). Figure 12. Advanced Communication I2C bq27421 EVM: Single-Cell Impedance Track Technology SLUUA63A – April 2013 – Revised July 2016 Submit Documentation Feedback Copyright © 2013–2016, Texas Instruments Incorporated...

  • Page 15: Parameter Q&A Screen

    Figure 13. Parameter Q&A Screen Figure 14. Golden Image Output Screen Figure 15. Perform Programming Screen SLUUA63A – April 2013 – Revised July 2016 bq27421 EVM: Single-Cell Impedance Track Technology Submit Documentation Feedback Copyright © 2013–2016, Texas Instruments Incorporated...

  • Page 16: Related Documentation From Texas Instruments

    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...
  • Page 17 STANDARD TERMS AND CONDITIONS FOR EVALUATION MODULES Delivery: TI delivers TI evaluation boards, kits, or modules, including any accompanying demonstration software, components, or documentation (collectively, an “EVM” or “EVMs”) to the User (“User”) in accordance with the terms and conditions set forth herein. Acceptance of the EVM is expressly subject to the following terms and conditions.
  • Page 18 FCC Interference Statement for Class B EVM devices NOTE: 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.
  • Page 19 【無線電波を送信する製品の開発キットをお使いになる際の注意事項】 開発キットの中には技術基準適合証明を受けて いないものがあります。 技術適合証明を受けていないもののご使用に際しては、電波法遵守のため、以下のいずれかの 措置を取っていただく必要がありますのでご注意ください。 1. 電波法施行規則第6条第1項第1号に基づく平成18年3月28日総務省告示第173号で定められた電波暗室等の試験設備でご使用 いただく。 2. 実験局の免許を取得後ご使用いただく。 3. 技術基準適合証明を取得後ご使用いただく。 なお、本製品は、上記の「ご使用にあたっての注意」を譲渡先、移転先に通知しない限り、譲渡、移転できないものとします。 上記を遵守頂けない場合は、電波法の罰則が適用される可能性があることをご留意ください。 日本テキサス・イ ンスツルメンツ株式会社 東京都新宿区西新宿６丁目２４番１号 西新宿三井ビル 3.3.3 Notice for EVMs for Power Line Communication: Please see http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_02.page 電力線搬送波通信についての開発キットをお使いになる際の注意事項については、次のところをご覧くださ い。http://www.tij.co.jp/lsds/ti_ja/general/eStore/notice_02.page SPACER EVM Use Restrictions and Warnings: 4.1 EVMS ARE NOT FOR USE IN FUNCTIONAL SAFETY AND/OR SAFETY CRITICAL EVALUATIONS, INCLUDING BUT NOT LIMITED TO EVALUATIONS OF LIFE SUPPORT APPLICATIONS.
  • Page 20 Notwithstanding the foregoing, any judgment may be enforced in any United States or foreign court, and TI may seek injunctive relief in any United States or foreign court. Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265 Copyright © 2015, Texas Instruments Incorporated...
  • Page 21 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.
  • Page 22 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Texas Instruments BQ27421EVM-G1A BQ27421EVM-G1B...

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