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BQ27531 with dual BQ24193

Darius Leckas
Prodigy 50 points
Other Parts Discussed in Thread: BQ25890, BQ25892, BQ24193

Hello, 

I am about to use BQ27531 battery gauge with two BQ24193s in paralell mode (as shown here www.ti.com/.../slyt651.pdf). My question is should I connect gauge to both master and slave charger, or only host or only slave?  

I need such a configuration because I need charge battery at high rate (4A) and supply system with power simulatenously (3-4A) and be able to control charging with gauge.

  • 0
    TI__Expert 8230 points

    Hello Darius,

    The dual chargers reference design is implemented using two different devices, the bq25890 and the bq25892. Each has a different I2C slave address which allow both chargers to be controlled.

    If you try to implement a similar design with two bq24193, you will run into redundancy issues trying to communicate via I2C with the devices since they have the same slave address.

    In addition, the fuel gauge is designed to control one charger at any given time. You would need to somehow ensure the gauge is talking to one charger at any given, which means you would need to disable a charger, modify it with the gauge, disable the recently modified charger and then modify the second one; but this may cause issues during charging .