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Using BQ27441-G1 in an ON/OFF system

Johann Seydoux37
Prodigy 30 points
Other Parts Discussed in Thread: BQ27441-G1, BQ24230

Dear all,

I am designing a battery management circuit that includes a BQ24230 battery charger and a BQ27441-G1 fuel gauge.

In our design, an ON/OFF controller driven by a push-button is used to connect/disconnect the system from the battery (including the host microcontroller and its dedicated power supply). The charger is directly connected to the battery: it does not depend on the ON/OFF controller to allow battery charging even if the push-button has not been pressed.

I have the following questions:

  1. Is it better to keep the fuel gauge outside the system (no ON/OFF controller dependency)?
  2. Knowing that the GPOUT output should not be left floating, what is the best solution if I want to connect it to the host microcontroller which can be disconnected from the battery?
  3. Are there any other recommendations other than 1MOhm pull-downs on I2C lines in this configuration?

Thank you in advance.

Best regards.