SLUUD24 May   2024

 

  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
    3. 1.3 Specification
    4. 1.4 Device Information
  8. 2Hardware
    1. 2.1 General Description
    2. 2.2 Definitions
    3. 2.3 Equipment
    4. 2.4 Equipment Setup
    5. 2.5 Procedure
      1. 2.5.1 Charge Function
      2. 2.5.2 OTG Function
  9. 3Hardware Design Files
    1. 3.1 Schematic
    2. 3.2 PCB Layout
    3. 3.3 Bill of Materials
  10. 4Additional Information
    1. 4.1 Trademarks

2.5.2 OTG Function

To evaluate the OTG function, please follow below step-by-step instructions:

  1. Use load #2 as a battery source, set to 15V or connect a 15V power supply to J3.
  2. Disconnect the power supply #1 from J1. (The connection must be physically removed from the board).
  3. Connect load #1 to the J1.
  4. Set inductor L/DCR time constant in AUTOTUNE_FORCE register.
    Write “A8A8” to 0x61 register.
  5. Set inductor DCR in GM_ADJUST_FORCE register.
    Write “B2B3” to 0x62 register.
  6. Write 03E8 (5000mV) to the OTG voltage register.
  7. Write 01E0 (3000mA) to the OTG current register.
  8. Remove JP2 to enable the OTG function.
  9. Check EN_OTG bit in Charge Option 3 ON (EN_OTG=1). See Figure 3-4.
  10. Set load #1 to 2A, then turn on the load.
    Measure → V(J1(VIN)) = 5V ±1V
    Measure → I(J1(VIN)) = 2A ±0.5A
    BQ25770GEVM, BQ25773GEVM Check EN_OTG bit in Charge Option 3 register Figure 2-4 Check EN_OTG bit in Charge Option 3 register