SLUUCF3A December   2020  – October 2021 BQ25672

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 EVM Features
    2. 1.2 I/O Descriptions
    3. 1.3 Recommended Operating Conditions
  3. 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
  4. 3PCB Layout Guidelines
  5. 4Board Layout, Schematic and Bill of Materials
    1. 4.1 BMS034E1 Board Layout
    2. 4.2 BQ25672EVM (BMS034E1-004) Schematic
    3. 4.3 Bill of Materials
  6. 5Revision History

2.4.4 OTG Mode Verification

Use the following steps for OTG mode verification for boost operation:

  1. Power up then turn off Load#2 output. Set to CR = 12 V/0.5 A = 24 Ω. Disconnect PS1 from J1 and attach Load#2 to J1 (VIN1 and GND).
  2. Increase Load #1 regulation voltage to 8.0 V and take measurements as follows:
    • Measure ➡ VBAT-PGND (TP29 and TP46) = 8.0 V ±0.1 V
  3. Prepare the OTG mode charger register settings in the following way:
    • In the Chip Configuration page below the Chip Configuration section
      • Uncheck "EN Charge" to disable charge mode
      • Check "EN OTG Mode" to enable OTG mode
      • Check "EN ADRV1" to enable ACDR1 FETs
    • In the OTG Configuration page below the OTG Configuration section
      • Set the OTG Reg Voltage to 12.000 mV.
      • Set the IOTG Limit to 1.000 A
  4. Take measurements as follows:
    • Measure ➡ VVBUS-PGND (TP23 and TP44) = 12.0 V ±0.2 V
    • Measure ➡ VAC1-PGND (TP24 and TP44) = 12.0 V ±0.2 V. Note that the PCB silk screen for VAC1 and VAC2 are reversed.
    • Click READ ALL REGISTERS
      • Verify ➡ REG1Bb[6] reports VINDPM or OTG
      • Verify ➡ REG1Cb[4:1] reports VBUS Status as Normal OTG
  5. Turn on Load#2 output set to constant resistance (CR) of 24 Ω.
  6. Take measurements as follows:
    • Measure ➡ VAC1-PGND (TP23 and TP44) = 12.0 V ±0.2 V
    • Measure ➡ IAC1-SENSE (TP1 and TP2) = 500 mA ±0.10 A
  7. Lower the Load#2 to constant resistance (CR) to 10 Ω.
  8. Take measurements as follows to confirm OTG current limit function:
    • Measure ➡ VAC1-PGND (TP23 and TP44) < 12.0 V ±0.2 V
    • Measure ➡ IAC1-SENSE (TP1 and TP2) = 1000 mA ±0.10 A
    • Click READ ALL REGISTERS and Verify ➡ REG1Bb[7] reports IINDPM
  9. Hints for further OTG testing:
    • Enabling OTG mode is a two-step process, first enable OTG and then turn on the appropriate AC drive FETs.