Tool/software:
I'm experimenting with using this IC in a battery backup application. When a power adapter is present, I effectively have the load and the BQ25756E with a battery in parallel; load gets power and my battery can charge. When the power adapter is removed, the MCU detects PG Pin pulled high, and enables reverse mode via I2C.
My question is, assuming my Reverse Voltage is ~= to the power adapter voltage, meaning the voltage across ACP and ACN may not be a good indicator, is there a way for the BQ25756E to detect the presence of a power adapter when in reverse mode? My understanding is that even if my MCU reads the ADC value for IAC, it's not a reliable method to determine if a power adapter was removed and became present again.
In other applications, I have used a Schottky diode at VIN, to block Reverse mode voltage from the power adapter net, and had the voltage of the anode available to the MCU. However, for my battery backup application, I was hoping to omit the diode at VIN and not deal with the diode drop. Am I missing something? Is the only way to put the BQ25756E back in forward mode to have the MCU powered on to detect a power adapter and write EN_REV=0?
