SLUUBU0A June   2018  – July 2022 BQ27Z561

 

  1.   BQ27Z561EVM-011 EVM Single-Cell Impedance Track™ Technology
  2.   Trademarks
  3. 1Features
    1. 1.1 Kit Contents
  4. 2BQ27Z561-Based Circuit Module
    1. 2.1 Circuit Module Connections
    2. 2.2 Pin Description
  5. 3Circuit Module Physical Layout, Bill of Materials and Schematic
    1. 3.1 Board Layout
    2. 3.2 Schematic
    3. 3.3 Bill of Material
    4. 3.4 BQ27Z561 Circuits Module Performance Specification Summary
  6. 4EVM Hardware and Software Setup
    1. 4.1 System Requirements
    2. 4.2 Software Installation
  7. 5Troubleshooting Unexpected Dialog Boxes
  8. 6Hardware Connection
    1. 6.1 Connecting the BQ27Z561 Circuit Module to a Battery Pack
    2. 6.2 Description of EVM Jumpers
  9. 7Operation
    1. 7.1 Starting the Program
    2. 7.2 Setting Programmable BQ27Z561 Options
      1. 7.2.1 Important Data Memory Parameters to Change
    3. 7.3 Setting the Chemistry
  10. 8Related Documentation from Texas Instruments
  11. 9Revision History

7.2.1 Important Data Memory Parameters to Change

This section outlines the minimal critical settings that should be changed for even the basic evaluation. A short description is included which can be used as a recommendation how to set the parameter value. Additional updates are needed for a production setting.

  1. [Gas Gauging][State][Qmax Cell 1]: This value should be updated to be the default design capacity of the battery being used. It represents the full unloaded chemical capacity of the cell. This value is updated by the gauge when proper learning is performed and in the field over the life of the battery.
  2. [Gas Gauging][IT Cfg][Term Voltage]: This value should be set to the minimum value of the end system when absolute 0% state of charge should be reported. For normal Li-ion cells this value should range between 3.2 V to 2.75 V. It is recommended this value is not set to above 3.4 V.
  3. [Advanced Charge Algorithm][Termination Config][Charge Term Taper Current]: This value should be set slightly above the capabilities of your charger to taper to. A recommended value is C/20 where C is the default capacity of the cell. For example a battery with 1000 mAh capacity should have a taper current of around 50 mA.
  4. [Advanced Charge Algorithm][Low/Standard/High/Rec Temp Charging][Voltage]: This parameter should be updated to the maximum charging voltage of the battery to be used. For a typical Li-Ion battery this value is between 4.4 V to 4.2 V.
  5. ChemID: It is important that the correct ChemID is updated to give the best accuracy. Refer to Section 7.3 on how to update the chemistry in the device. If your cell is not included in the chemistry list, it is possible to run a match on the battery by following the steps here: http://www.ti.com/tool/gpcchem. For basic testing if the correct chemistry is unknown it is important to chose a chemistry ID with the same maximum charging voltage as the intended cell. Our recommended ID's for common charging voltages are as follows:
    • 4.2 V (ID 1202)
    • 4.35 V (ID 3230)
    • 4.4 V (ID 3142)