I'm trying to replace some old, custom PN marked fuel injector driver ICs for a project. The drivers use CMOS triggering, so input is easy. The driver pulses a boost voltage at the start of the injection sequence, then uses battery voltage to hold the injector open.
The other inputs to the driver are a pin to monitor the MOSFET driver voltage per sequence, and another pin that monitors the return voltage from the injector. I believe these are both for fault protection; shut down the injector if a short is detected, not 100% sure yet.
This driver is all 5v in, 5v out.
I'm thinking this should be easily do-able for a micro as simple as a 328. I haven't yet put a scope to all this (I have a 2 channel scope, but I think I will need at least a 4 channel) to fully reverse engineer the operation, but I don't expect anything for major surprises. There is no "communication" to anything else, it just accepts the input to run an injection sequence.
Thoughts? Anything I may be overlooking?