SLUAAF8 October   2021 BQ24707 , BQ24707A , BQ24725A , BQ24735 , BQ24770 , BQ24780S , BQ24800 , BQ25700A , BQ25708 , BQ25710 , BQ25720 , BQ25730 , BQ28Z610-R1 , BQ4050 , BQ40Z50 , BQ40Z50-R1 , BQ40Z50-R2 , BQ40Z80

 

  1.   Trademarks
  2. 1Introduction
  3. 2Smart Battery Setup
    1. 2.1 Gauge Setup
      1. 2.1.1 I2C System Differences
    2. 2.2 Charger Setup
  4. 3Communication Protocol
  5. 4Data Collected
  6. 5Summary
  7.   A Appendix
    1.     A.1 General Setup
    2.     A.2 Gauge Setup - SMBus
    3.     A.3 Gauge Setup - I2C
    4.     A.4 Charger Setup
    5.     A.5 Charge Voltage Example
    6.     A.6 Charge Current Example
  8.   B References

A.4 Charger Setup

Follow the BQ2571x Evaluation Module users guide for basic charger hardware setup.

The SMBus based charger uses the predefined charge current address (0x14) to comply with the SBS guidelines. There is no further setup on the charger side required, the gauge handles everything.

GUID-20210730-SS0I-PJXF-81JB-GLJXMJ9NSQZK-low.pngFigure 6-3 BQ25710 SMBus Charge Current Register (0x14)

Follow the BQ2573X Evaluation Module user's guide for basic charger hardware setup.

The I2C-based charger charge current register configuration is essentially the same format as SMBus, except the I2C-based charger uses a different address. Any I2C-based charger with a similar register format to the BQ25730 will work with the I2C broadcast mode.

GUID-20210802-CA0I-TXXS-QLNW-240KCTRV2PWR-low.pngFigure 6-4 BQ25730 I2C Charger Current Register