I'm trying to implement a bi-color LED connected to a Microchip MCP73831 battery charge management controller, so I can switch between red and green LED output. Currently my circuit is mixing them during charging and gives me an orange color, but it's hardly distinguishable from a green LED when it's fully charged.
I want to add an NPN transistor to the negative side of the green LED, so the transistor will switch it on when the STAT pin is high and it will turn off when the STAT pin is low.
Problem is that I couldn't find the STAT pin current when it's in the high state. I looked around in Google and almost everyone uses a limiting resistor on the base of NPN transistor, generally 1k ohm value.
Can anybody tell me what resistor value I should use for R3? Or do I need it at all?
Datasheet for the Nexperia PMBT2222 NPN transistor which I'm thinking to use. The peak base current is noted as 200mA, if that makes any sense.