Ok, I realize this is super-simple but it's been a long time since I've needed to do this so I'm trying to figure out the best way.
Basically I have a thermistor monitoring the temperature of an LED. If the firmware hangs and leaves the LED on too long then the temp gets too high then this goes to a comparator which then pulls the output low, disabling the LED driver. However, once the temperature cools down enough then the circuit will relax and the LED will turn back on, continually oscillating.
However, I want to have this latching, so once it trips, the output to the LED driver stays low until the micro resets it. Reset could be with a separate pin if needed.
What is the best way to implement this? I wasn't sure whether this was a logic problem, or if TI made a product designed exactly for this. I looked into latching comparators (TLV3603E) but it won't automatically latch the output; you have to tell it when to.
I realize that I could probably cobble something together with a bunch of FETs and RC circuits but I'm looking for a more elegant solution.
Thanks,
Derek
