I need to monitor/control several analog signals. I have very little board space to do so and, hopefully, monies.
For a variety of reasons, an MCU will at least need to be part of the solution (as there needs to be sequencing, communication and other conditional logic). But, the "processing" needs are tiny enough that a dog of an MCU could likely be coerced into functioning.
[The downside is the addition of a "programming" step at manufacture]I was hoping to use single pins for measurement and control. E.g., drive pin low to disable a poser supply; let it float to the voltage of the monitored supply to measure the actual supply voltage. Repeat for each controlled supply, etc. (obviously, no need to "disable" a temperature input)
But, this seems to add a fair number of passives that might eat up more real estate than the pin's saving gains!
And, ensuring that the "output" is driven low during power sequencing of the "supervisor" presents another opportunity for component creep.
Any other potential downsides to this sort of hack?