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

2.5.1 Charge Function

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

Note: To write registers using bqStudio software, change update mode to Manual, enter the new values in the Current Value column in the register map, press Write Register button, press Read Register to read back and confirm the write. Alternatively, the user can click each register bit or choose a value from the right-side panel, then press Write Register button.
  1. Make sure the steps in Section 2.4 are followed.
  2. Set the power supply #1 to 20V, 9A current limit, then turn on the power supply.
  3. Set the load #2 to 15V, then turn on load #2 (VBAT load).
  4. Set the load #1 to 2A, then turn on load #1 (VSYS load).
  5. Confirm the Tgt Address is 12(9) for BQ25770G or D6(6B) for BQ25773G in BQStudio.
  6. Disable Watchdog timer.
    Write 870E to charge option 0 register .
    Measure → V(J1(VIN)) = 20V ±0.5 V
    Measure → V(TP53(CHRG_OK)) = 3V to 4.5V
    Measure → V(TP38(REGN)) = 5V ±1 V
    Measure → V(TP54(ILIM_HIZ)) = 3V
  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.
  10. Set Charge Current Register.
    Write “0800”(2048mA) to charge current register.
  11. Measure → V(J2(SYS)) = 15V ±0.5V
    Measure → V(J3(VBAT)) = 15V ±0.5V
    Measure → I(J3(VBAT)) = 2A ±0.5A.