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Best thermal overload protection for my circuit?
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jonwil:
Can anyone suggest a good part (something I can buy at Jaycar) to add to my circuit to cut power if the ATTiny85 micro starts getting too hot?
I think I need some sort of thermistor but I dont know the first thing about thermistors :)
EDIT: Some sort of over-current protection would also be great (not sure what sort is best for this or how to calculate the value to use)
OM222O:
You can use a polyfuse for over current. They have positive tempco and as the current passes through them, their resistance increases which means they "trip" since they go really high resistance. Once cooled off, they are back to normal. If you place it near the MCU or if your PCB is small, they can also trip of the ambient gets too hot.
If you want to control the attiny temp itself, that's a bit more involved, but my main question would be, how on earth are you heating up the MCU to begin with? If that's happening, you did something wrong in your design.
MarkL:
You haven't described your application in enough detail, but the ATTINY85 has a built-in temperature sensor that you could monitor periodically and shut things down if it's approaching operational limits.
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