gmorfeus
Junior Member level 1
Hi,
I am designing a device that will have automatic switch to battery when primary power source is removed also charging battery when primary power is present. In my design, I will be using PIC24 and BQ24725A as battery charger controller. For the charger I will use proposed schematic from datasheet. I would like to monitor battery voltage to be able to switch off the device when Li-Ion voltage drops too much. I know that I may use A/D pin on PIC connecting a voltage divider to battery +. But, won't the current flowing to the battery when battery is charging, "kill" the PIC A/D pin? Perhaps there is no need to use voltage divider but only add a 1M resistor between battery + and A/D pin on PIC?
Thanks!
Kind regards,
Gabrijel
I am designing a device that will have automatic switch to battery when primary power source is removed also charging battery when primary power is present. In my design, I will be using PIC24 and BQ24725A as battery charger controller. For the charger I will use proposed schematic from datasheet. I would like to monitor battery voltage to be able to switch off the device when Li-Ion voltage drops too much. I know that I may use A/D pin on PIC connecting a voltage divider to battery +. But, won't the current flowing to the battery when battery is charging, "kill" the PIC A/D pin? Perhaps there is no need to use voltage divider but only add a 1M resistor between battery + and A/D pin on PIC?
Thanks!
Kind regards,
Gabrijel
