SLUUCF7 April   2021 BQ25960

 

  1.   Trademarks
  2. 1Introduction
    1. 1.1 EVM Features
    2. 1.2 I/O Descriptions
  3. 2Test Summary
    1. 2.1 Equipment
    2. 2.2 Equipment Setup
    3. 2.3 Software Setup
    4. 2.4 Test Procedure
      1. 2.4.1 Initial Settings
      2. 2.4.2 Communication Verification
      3. 2.4.3 Switched Cap Mode Charge Verification
      4. 2.4.4 Bypass Mode Charge Verification
      5. 2.4.5 Dual BQ25960 Operation
      6. 2.4.6 BQ25611D Charge Verification
  4. 3PCB Layout Guidelines
  5. 4Board Layout, Schematic, and Bill of Materials
    1. 4.1 Board Layout
    2. 4.2 Schematic
    3. 4.3 Bill of Materials

2.4.6 BQ25611D Charge Verification

Out of the box, the BQ25960EVM is configured to evaluate the performance of the BQ25960 only. If the BQ25611D must also be evaluated, then the user should populate R29 and R32, as shown in the schematic in Figure 4-11

A typical use case is for the BQ25611D buck charger (U4) to perform low current pre-charge and charge termination, while one or both of the BQ25960 switched cap chargers (U1 and U2) perform high current fast charging in order to achieve the highest possible efficiency.

Use the following steps to charge with the BQ25611D. The I2C address for U4 is 0x6B.

  1. Turn PS1 and Load #1 off. Make any required hardware changes, such as populating R29 and R32 and configuring the jumpers.
  2. Decrease the output of Load #1 to 2.5 V. This voltage is low enough for the BQ25611D to pre-charge.
  3. Turn on PS1 and Load #1. The BQ25611D should automatically begin to apply the default 0.18 A pre-charge current. The Charge Status register will indicate this.
    GUID-20201218-CA0I-WZSM-X5RV-LR6MMPQPHGRC-low.png

  4. Increase the output of Load #1 above VBATLOWV (typical value of 3.12 V). The BQ25611D will begin applying the default 1.02 A fast charge current. The Charge Status register will indicate this.
    GUID-20201218-CA0I-P9RL-RPZ7-JWW0BSC9XQ7M-low.png