SLUUCV6 June   2024 BQ2969

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   Applications
  6.   6
  7. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
      1. 1.2.1 Required Equipment
    3. 1.3 Specification
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1 Setup
    2. 2.2 BQ2969 Circuit Module Use
      1. 2.2.1 Cell Simulator
      2. 2.2.2 Reducing the Cell Count
      3. 2.2.3 Connecting Cells
    3. 2.3 Best Practices
  9. 3Hardware Design Files
    1. 3.1 BQ2969EVM Circuit Module Physical Construction
      1. 3.1.1 Schematics
      2. 3.1.2 Board Layout
      3. 3.1.3 Bill of Materials
  10. 4Additional Information
    1. 4.1 Trademarks
  11. 5Related Documents from Texas Instruments

Reducing the Cell Count

The BQ2969 cell count is reduced by shorting unused cells, normally from the top down but cells between the top and bottom can be shorted. The inputs are usually shorted at the IC as shown in the data sheet. The bottom cell must be used for proper operation. Power for the IC comes from the BAT+ terminal so power must be connected when using the EVM. While not recommended, the inputs of the EVM can typically be shorted at the terminal block for quick evaluation. For the best transient environment and to match the data sheet example, short the VCx pins at the capacitor and remove the unused input resistor. When using the cell simulator, shorting the unused cell at the terminal block is still required to eliminate the simulated cell voltage. Shorting the cell inputs at the terminal block screw terminals is also suggested since shorting the cell inputs is a visual indication that the device is configured for a different cell count. While different connections are possible, Table 3-1 shows configuration recommendations for reduced cell counts.

Table 2-1 Reducing the Cell Count
Unused Cell
(Numbered from Bottom Cell 1)
Short Cell Input TerminalsInput Resistor to RemoveReplace Capacitor with 0ΩIC Inputs Shorted
Cell 4BAT+ to CELL3R4C6VC4 to VC3
Cell 3CELL3 to CELL2R7C7VC3 to VC2