SLUUAV7C December   2013  – November 2022 BQ40Z50 , BQ40Z50-R2

 

  1.   Abstract
  2.   Trademarks
  3. 1Features
    1. 1.1 Kit Contents
    2. 1.2 Ordering Information
    3. 1.3 Documentation
    4. 1.4 bq40z50 and bq296000 Circuit Module Performance Specification Summary
  4. 2bq40z50EVM Quick Start Guide
    1. 2.1 Items Needed for EVM Setup and Evaluation
    2. 2.2 Software Installation
    3. 2.3 EVM Connections
    4. 2.4 Update Firmware
  5. 3Battery Management Studio
    1. 3.1 Registers Screen
    2. 3.2 Setting Programmable bq40z50 Options
    3. 3.3 Calibration Screen
      1. 3.3.1 Voltage Calibration
      2. 3.3.2 Temperature Calibration
      3. 3.3.3 Current Calibration
    4. 3.4 Chemistry Screen
    5. 3.5 Firmware Screen
      1. 3.5.1 Programming the Flash Memory
      2. 3.5.2 Exporting the Flash Memory
    6. 3.6 Advanced Comm SMB Screen
  6. 4bq40z50EVM Circuit Module Schematic
    1. 4.1 Pre-Charge
    2. 4.2 LED Control
    3. 4.3 Emergency Shutdown
    4. 4.4 Testing Fuse-Blowing Circuit
    5. 4.5 PTC Thermistor
  7. 5Circuit Module Physical Layouts
    1. 5.1 Board Layout
    2. 5.2 Schematic
  8. 6Bill of Materials
  9. 7Related Documentation from Texas Instruments
  10. 8Revision History

4.1 Pre-Charge

The EVM provides a power resistor and FET to support a reduced current pre-charge path to charge the pack when cell voltages are below the pre-charge voltage threshold. This reduces heating that could lead to cell damage or reduced operating lifetime. The resistor (R1) is set up to limit the current to less than 40 mA for a 4S configuration. The user can change R1 to setup the pre-charge current to a different value.