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

5 Summary

TI's SMBus gauge and charger can be setup to communicate together for a simple solution for a BMS. This method can reduce the overall cost of a BMS which can still report accurate SOC, provide protection, and send charging information to the charger. The gauge operates as the simple MCU of the system to stop charge or discharge in the case of any fault conditions, and complete a desired charging profile following any JEITA or custom temperature profile.

The system can be setup using the SMBus compliant gauge and charger, or by using the I2C based BQ28Z610-R1 as long as the I2C-based charger conforms to the broadcast formatting of the gauge.