SLUUD09 April   2024 BQ25308

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 I/O Descriptions
    2. 2.2 Equipment
    3. 2.3 Equipment Setup
  8. 3Implementation Results
    1. 3.1 Test Setup and Results
      1. 3.1.1 Test Procedure
        1. 3.1.1.1 Initial Settings
        2. 3.1.1.2 Precharge Mode Verification
        3. 3.1.1.3 Fast Charge Mode Verification
        4. 3.1.1.4 Battery Temperature Monitoring Verification
        5. 3.1.1.5 Helpful Tips
  9. 4Hardware Design Files
    1. 4.1 Schematic
    2. 4.2 PCB Layout
      1. 4.2.1 Board Layout
    3. 4.3 Bill of Materials
  10. 5Additional Information
    1. 5.1 Trademarks

3.1.1.5 Helpful Tips

  1. BQ25308EVM is configured by default to operate with TS in normal range. If external thermistor is available, connect external thermistor at J1(2)-EXT_TS and J1(1)-PGND, and remove R14.
  2. The leads and cables to the various power supplies, batteries and loads have resistance. The current meters also have series resistance. The charger dynamically reduces charge current depending on the voltage sensed at the VBUS pin (using the VINDPM feature), BAT pin (as part of normal termination), and TS pin (through the battery temperature monitoring feature via battery thermistor). Therefore, voltmeters must be used to measure the voltage as close to the IC pins as possible instead of relying on the digital readouts of the power supply.
  3. When using a source meter that can source and sink current as your battery simulator, TI highly recommends adding a large (1000+ μF) capacitor at the EVM BATTERY and GND connectors to simulate a real battery. Configuring the source meter for 4-wire sensing eliminates the need for a separate voltmeter to measure the voltage at the BAT pin.
    When using 4-wire sensing, always make sure that the sensing leads are connected to prevent accidental overvoltage by the power leads.