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ADC damaged?

Question asked by tyugay.igor on Jan 20, 2014
STM8L152K6T6

My application has one ADC input for external device connection with output volatge range in 0..2V. It works fine for a while, but once,  when external device was unplugged and plugged again, ADC channel returns invalid values and MCU become very hot. After replacing MCU, application works for a long time, but after external device was unplugged and plugged again, that problem returns. ADC do not works properly and MCU temperature too high.

ADC input pin is in "open air". May be some static electricity killed ADC channel? Should I place resistor between ADC input pin and ground?

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