Good evening,
I'm after a pretty straight forward functionality, but I'm struggling to find a suitable IC.
My circuit is permanently connected to an automotive battery. In order to enable power to the circuit, I'd like to use a supervisory IC which toggles the ENABLE pin of my circuit's PMIC high when a switched input, interfaced to the supervisory IC, goes high (e.g. accessory source). When the switched input goes low (i.e. the car is turned off), I'd like to have a delay before the supervisory IC toggles the ENABLE pin of the PMIC low.
Is something like the LTC2954 more or less what I'm after? It's designed for an active low push button, so I'll need to invert the logic there (with a MOSFET of some sort I'd imagine), but it provides an interrupt to the MCU when the monitored voltage drops, which is exactly what I'm after. The LTC2954 is a bit more costly than I'd like, so any suggestions of lower cost alternatives would be great!
Any guidance would be greatly appreciated, even if it's a recommendation as to which search terms I should be using. Most of my searches result in watchdog timer and PoR ICs.
Thanks!
