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bq27520EVM With System-Side, Single-Cell Impedance
This evaluation module (EVM) is a complete evaluation system for the bq27520. The EVM includes one
bq27520 circuit module, a current sense resistor, one thermistor, an EV2300 PC interface board for gas
gauge interface and a PC USB cable. The circuit module includes one bq27520 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 interface board
and software, the user can read the bq27520 data registers, program the chipset for different pack
configurations, log cycling data for further evaluation, and evaluate the overall functionality of the bq27520
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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bqEASY, Impedance Track are trademarks of Texas Instruments.
Windows, Microsoft are trademarks of Microsoft Corporation.
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C is a trademark of Philips Corporation.
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bq27520EVM With System-Side, Single-Cell Impedance Track™ Technology
Copyright © 2010, Texas Instruments Incorporated
Track™ Technology
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User's Guide
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Table of Contents
Related Manuals for Texas Instruments Track bq27520EVM
Summary of Contents for Texas Instruments Track bq27520EVM
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Page 1: Table Of Contents
The latest Windows™-based PC software can be downloaded from the product folder on the Texas Instruments Web site. Contents ........................ -
Page 2: Features
C™ communication data line C communication clock line Signal return for communication line, shared with charger and ground CHG+/LOAD+ High potential of load or charger connection bq27520EVM With System-Side, Single-Cell Impedance Track™ Technology SLUU426 – June 2010 Copyright © 2010, Texas Instruments Incorporated... -
Page 3: Circuit Module Physical Layouts, Bill Of Materials, And Schematic
This section shows the printed-circuit board (PCB) layers (Figure 1 through Figure 4), assembly drawing, and schematic for the bq27520 module. Figure 1. bq27520EVM-001 Layout – Silk Screen SLUU426 – June 2010 bq27520EVM With System-Side, Single-Cell Impedance Track™ Technology Copyright © 2010, Texas Instruments Incorporated... -
Page 4: Top Assembly
Circuit Module Physical Layouts, Bill of Materials, and Schematic www.ti.com Figure 2. Top Assembly Figure 3. Top Layer bq27520EVM With System-Side, Single-Cell Impedance Track™ Technology SLUU426 – June 2010 Copyright © 2010, Texas Instruments Incorporated... -
Page 5: Bottom Layer
Test Point, Red, Thru Hole Color Keyed 0.100 x 0.100 Keystone 5000 inch TP2, TP5 Test Point, Black, Thru Hole Color Keyed 0.100 x 0.100 Keystone 5001 inch SLUU426 – June 2010 bq27520EVM With System-Side, Single-Cell Impedance Track™ Technology Copyright © 2010, Texas Instruments Incorporated... - Page 6 Part Number Test Point, White, Thru Hole Color Keyed 0.100 x 0.100 Keystone 5002 inch IC, System-Side Impedance-Track Fuel Texas BQ27520YZF Gauge Instruments bq27520EVM With System-Side, Single-Cell Impedance Track™ Technology SLUU426 – June 2010 Copyright © 2010, Texas Instruments Incorporated...
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Page 7: Schematic
Circuit Module Physical Layouts, Bill of Materials, and Schematic www.ti.com Figure 5. Schematic bq27520 Circuit Module Performance Specification Summary This section summarizes the performance specifications of the bq27520 circuit module. SLUU426 – June 2010 bq27520EVM With System-Side, Single-Cell Impedance Track™ Technology Copyright © 2010, Texas Instruments Incorporated... -
Page 8: Evm Hardware And Software Setup
Connecting the bq27520 Circuit Module to a Battery Pack Figure 6 shows how to connect the bq27520 circuit module to the cells and system load/charger. bq27520EVM With System-Side, Single-Cell Impedance Track™ Technology SLUU426 – June 2010 Copyright © 2010, Texas Instruments Incorporated... -
Page 9: Bq27520 Circuit Module Connection To Cell And System Load/Charger
EV2300 2. Connect the PC USB cable to the EV2300 and the PC USB port. The bq27520EVM-001 is now set up for operation. SLUU426 – June 2010 bq27520EVM With System-Side, Single-Cell Impedance Track™ Technology Copyright © 2010, Texas Instruments Incorporated... -
Page 10: Operation
Operation This section details the operation of the bq27520 EVSW software. Starting the Program Run bq27520 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 11: Data Flash Screen
| Write All | button. The module calibration data is also held in the bq27520 data flash. SLUU426 – June 2010 bq27520EVM With System-Side, Single-Cell Impedance Track™ Technology Copyright © 2010, Texas Instruments Incorporated... -
Page 12: Calibrate Screen
Press the Calibrate Part as indicated below button. Pack Current Calibration • Connect a load to LOAD– and LOAD+ that draws approximately 1 A, or connect a current source to bq27520EVM With System-Side, Single-Cell Impedance Track™ Technology SLUU426 – June 2010 Copyright © 2010, Texas Instruments Incorporated... -
Page 13: Calibration Screen
Measure the current with a calibrated meter, and type the value into Enter Actual Current using (-) for current in discharge direction. • Press the Calibrate Part as indicated below button. Figure 9. Calibration Screen SLUU426 – June 2010 bq27520EVM With System-Side, Single-Cell Impedance Track™ Technology Copyright © 2010, Texas Instruments Incorporated... -
Page 14: I2C Pro Screen
Software 10.1 Introduction Texas Instruments fuel gauges, employing the Impedance Track™ algorithm, offer an unmatched array of features and benefits. Sometimes, however, the wide range of configuration settings can seem challenging to get started with the evaluation process. In addition, determining the correct chemistry model and producing the 'golden image' file can be time consuming. -
Page 15: Bqeasy™ Welcome Screen
Some operations must be completed in sequence due to data dependencies, or to implement the proper flow. Therefore, it is recommended that the prescribed sequence be followed, at least at first. SLUU426 – June 2010 bq27520EVM With System-Side, Single-Cell Impedance Track™ Technology Copyright © 2010, Texas Instruments Incorporated... -
Page 16: Bqeasy™ Flowchart
(c) Answer all questions, or leave defaults for all of tab "2", but be sure to click the "OK" button at the bottom of each tab "2" page to ensure that a Completion Checkmark appears for each page. bq27520EVM With System-Side, Single-Cell Impedance Track™ Technology SLUU426 – June 2010 Copyright © 2010, Texas Instruments Incorporated... - Page 17 They are kept in the ..\bq_Evaluation _Software\Plugins\Projects folder. 10.5 Completion Checkmarks As the wizard questions and tasks are completed, completion checkmarks appear in two places – along SLUU426 – June 2010 bq27520EVM With System-Side, Single-Cell Impedance Track™ Technology Copyright © 2010, Texas Instruments Incorporated...
- Page 18 Doing this correctly requires a series of charge and discharge cycles. The discharge part can be automated with the bqEASY™ program if the simple load circuit for the chemistry selection is available. Follow the screen instructions. bq27520EVM With System-Side, Single-Cell Impedance Track™ Technology SLUU426 – June 2010 Copyright © 2010, Texas Instruments Incorporated...
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Page 19: Related Documentation From Texas Instruments
Figure 13. Load and Switch 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 20 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 21 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.
- Page 22 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Texas Instruments BQ27520EVM...