SLUUD36A July   2024  – August 2024 BQ25820

 

  1.   1
  2.   Description
  3.   Get Started
  4.   Features
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
    5. 1.5 General Texas Instruments High Voltage Evaluation (TI HV EMV) User Safety Guidelines
      1. 1.5.1 General Safety Information
  7. 2Hardware
    1. 2.1 Board Parameters
    2. 2.2 IO and Jumper Descriptions
    3. 2.3 Communication Interface Setup
      1. 2.3.1 BQSTUDIO using EV2400
      2. 2.3.2 TI Charger GUI for USB2ANY
    4. 2.4 Equipment
      1. 2.4.1 Equipment Set Up
      2. 2.4.2 Equipment - Using a CV Load
      3. 2.4.3 Equipment Setup - Using a CV Load
  8. 3Hardware Design Files
    1. 3.1 Schematic
    2. 3.2 PCB Layout
    3. 3.3 Bill of Materials
  9. 4Additional Information
    1. 4.1 Trademarks
  10. 5Revision History

2.4.3 Equipment Setup - Using a CV Load

BQ25820EVM

Use the following guidelines to set up the equipment:

  1. Set power supply 1 for 40V DC, 8A current limit and then turn off the supply.
  2. Connect the output of power supply 1 in series with a current meter to J1 (VIN and PGND).
  3. Connect a voltage meter across J1 (VIN) and J1 (PGND).
  4. Connect load 1 in series with a current meter to J3 (VOUT and PGND).
  5. Connect a voltage meter across J3 (VOUT and PGND).
  6. Set electronics load to CV mode and 23.5V. Turn off load 1.
    Note: Add a 3000uF capacitor on BAT pin when testing without real battery.
  7. Connect J5 to the EV2400. Connect J5 to the I2C PORT 2 on the EV2400.
  8. Make sure the jumpers are installed as indicated in IO and Jumper Descriptions.
  9. Unplug Jumper 13.
  10. If using Battery Management Studio, then use the following steps:
    1. Connect J5 to the EV2400. Connect J5 to the I2C PORT 2 on the EV2400
    2. Turn on the computer and load 2. Open the bqStudio software.
    3. Select Charger and click the Next button.
      BQ25820EVM
    4. Select Charger_1_00_BQ25820.bqz on the Select a Target Page.
    5. After selecting the target device, click Field View. and then click the Read Register button.
    6. Set WATCHDOG and EN_CHG to disabled.BQ25820EVM
    7. In 16 Bit Registers, set ICHG_REG to 4000mA and IPRECHG to 1000mA.BQ25820EVM
  11. If using TI Charger GUI, then use the following steps:
    1. Connect J4 to the USB2ANY. Turn on the computer and load 2.
    2. Navigate to the TI Charger GUI website and select the charger to use:
      BQ25820EVM
    3. At the top left of the screen, users will see the Hardware Connected icon. After users see the hardware is connected, select the plug icon on the left panel.
      BQ25820EVM
    4. This is the Charger Configuration window. Click the Read All Register button at the top, then set WATCHDOG and EN_CHG to disabled. Set ICHG_REG to 4000mA and IPRECHG to 1000mA.
      BQ25820EVM
    5. Here is a brief description of what the other icons on the left side panel are. Select through these icons to configure other operations of the battery charger.
      BQ25820EVM
  12. Set EN_CHG to enabled. Plug in jumper 13.
  13. Set power supply 1 to 40V, measure

    V(J1(VAC)) = 40V ± 0.5V

    I(J1(IAC)) = 1.2A ± 0.5A

    V(J3(VBAT)) = 23. V ± 0.5V

    I(J3(IBAT)) = 2A ± 0.5A

Use the following guidelines to test the BQ25820 EVM power path:

  1. Disconnect the power supply from J1 (VIN and PGND) and disconnect Load 1 from J3 (VOUT and PGND).
  2. Connect the output of power supply 1 to J3 (VOUT and PGND).
  3. Set power supply 1 for 20V DC, 8A current limit and then turn off power supply.
  4. Connect a voltage meter across J2 (VSYS) and J2 (PGND).
  5. Turn on power supply 1, measure V(J2(VSYS)) = 20V ± 0.5V.