SLUUC51D june   2020  – july 2023 BQ25790

 

  1.   1
  2.   BQ25790EVM (BMS027) Evaluation Module User's Guide
  3.   Trademarks
  4.   4
  5. 1Introduction
    1. 1.1 EVM Features
    2. 1.2 I/O Descriptions
    3. 1.3 Recommended Operating Conditions
  6. 2Test Setup and Results
    1. 2.1 Equipment
    2. 2.2 Equipment Setup
    3. 2.3 Software Setup
      1. 2.3.1 BQSTUDIO using EV2400
      2. 2.3.2 TI Charger GUI for USB2ANY
    4. 2.4 Test Procedure
      1. 2.4.1 Initial Settings
      2. 2.4.2 Communication Verification
      3. 2.4.3 Charge Mode Verification
      4. 2.4.4 OTG Mode Verification
  7. 3PCB Layout Guidelines
  8. 4Board Layout, Schematic and Bill of Materials
    1. 4.1 Schematic
    2. 4.2 Board Layout
    3. 4.3 Bill of Materials
  9. 5Revision History

2.4.2 Communication Verification

If using Battery Management Studio, then use the following steps for communications verification.

  1. In Battery Management Studio, select READ REGISTER at the top of the page. Device ACK OKappears at the top of the page.
  2. Select Field View in the top right of the screen. Note there are two tabs, one for 8-bit registers and one for 16-bit registers. In the 8-bit tab, there are sections for chip, charger and OTG single-bit and multi-bit registers. In the 16-bit tab are the charger and OTG multi-bit registers for setting voltages and currents. In addition, the ADC registers are on the 16-bit tab.
  3. Prepare the charge mode charger register settings in the following way if not already set there by default:
    • On the 8-bit Registers tab in the Chip Config Single-bit Registers section,
      • Change Watchdog Timer to disabled.
      • Check the "ShipFET Present?" check box.
      GUID-E6B83A57-93D2-4AC2-88C4-A022FDFC999A-low.png Figure 2-2 Single Bit Registers Section
    • On the 8-bit Registers tab in the Charger Multi-bit Registers section,
      • Set the Precharge current to 240 mA.
      • Set ABS VINDPM to 4000 mV.
      • Set VSYSMIN to 7000 mV.
      GUID-9C549372-DC57-418C-B957-D758B2485F41-low.png Figure 2-3 Multi-Bit Register Section
    • On the 16-bit Registers tab in the Charger Multi-bit Registers section,
      • Set the Charge Voltage charging regulation limit to 8400 mV.
      • Set the Charge Current to 500 mA.
      • Set the input current regulation limit (IINDPM) to 3000 mA.
    GUID-1D93F725-0914-458C-A138-9E0514F8AF28-low.png Figure 2-4 16-Bit Register Section

If using TI Charger GUI, then follow these steps.

  1. In the TI Charger GUI homepage, select the charger that is in use. At the bottom-left, user should see Hardware Connected. Figure 2-5 is a brief description of what the icons on the left side panel mean:

    GUID-F1D733FB-E5C4-450D-9802-7F386C9D2320-low.png
    Figure 2-5 Icon Guide
    Note: If the EVM is powered but not communicating (for example, does not ACK), then try updating the USB2ANY firmware to the latest version using the software at SLVC695. The software contains steps to press the reset button, on the opposite side of the USB connector to the LED, using a paper clip or narrow pin.
  2. Go to the Chip Configuration and set the Watchdog Timer to disabled and check the ShipFET present? box.
    GUID-20C14AE0-86F6-438E-AC22-D1E92304F114-low.png Figure 2-6 Chip Configuration
  3. Go to the Charger Configuration and set
    • VSYSMIN to 7 V
    • Charge Voltage to 8.4 V
    • Charge Current to 0.5 A
    • Precharge current to 0.24 A
    • IINDPM to 3 A
    • ABS VINDPM to 4.0 V
      GUID-5318B546-3673-4197-A68C-F19F7E10B3C5-low.png Figure 2-7 Charger Configuration