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[FAQ] BQ25120A: Can I pullup the /INT and /PG to any voltage? Where do I need to pull up the I2C pins to?

Part Number: BQ25120A

On the BQ25120A, both the /INT (Status Output) pin and /PG (Power Good) pins are an open-drain outputs, you can connect these pins via a pull up resistor or LED to the desired logic voltage. If monitoring the /INT or /PG pins via a microcontroller (MCU) application, you want your digital level to match by tying it to your MCU digital power rail.

On the I2C BUS (SDA/SCL) you need to connect your I2C pull-up resistors to the VSYS rail. Keep in mind that the I2C Bus of your system is shared between slaves and needs to match the logic level of your MCU.