SLUUCY2 November   2023

 

  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.     Trademarks

2.5.1 Charge Function

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

  1. Make sure the Equipment Setup steps are followed.
  2. Set the power supply #1 to 20 V, 9 A current limit, then turn on the power supply.
  3. Set the load #2 to 15 V, then turn on load #2 (VBAT load).
  4. Set the load #1 to 2 A, then turn on load #1 (VSYS load).
  5. Confirm the Tgt Address is 12(9) for BQ25770 or D6(6B) for BQ25773 in BQStudio.
  6. Disable Watchdog timer.
    Write “870E” to charge option 0 register 0x12H (BQ25770) or 0x00H (BQ25773).
    Measure → V(J1(VIN)) = 20 V ±0.5 V
    Measure → V(TP53(CHRG_OK)) = 3 V to 4.5 V
    Measure → V(TP38(REGN)) = 5 V ±1 V
    Measure → V(TP54(ILIM_HIZ)) = 3 V
  7. Set inductor L/DCR time constant in AUTOTUNE_FORCE register.
    Write “A8A8” to 0x61 register.
  8. Set inductor DCR in GM_ADJUST_FORCE register.
    Write “B2B3” to 0x62 register.
  9. Set Charge Voltage Register.
    Write “41A0” (16.8V) to charge voltage register 0x15H(BQ25770) or 0x04H (BQ25773).
  10. Set Charge Current Register.
    Write “0800”(2048mA) to charge current register 0x14H (BQ25770) or 0x02H (BQ25773).
  11. Measure → V(J2(SYS)) = 15 V ±0.5 V
    Measure → V(J3(VBAT)) = 15 V ±0.5 V
    Measure → I(J3(VBAT)) = 2 A ±0.5 A.