ADC Absolute Maximum Input Voltage

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If I use the internal 1V voltage reference for the ADC, can I apply 3.3V on the input pin, sample and get a result of 0xFFF , AND not destroy anything?

 

I didn't see it in the datasheet so my guess is that it's ok?  Are all micros the same in this regard?

Last Edited: Thu. Oct 15, 2015 - 11:31 PM
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If we assume the voltage the device is running from is 3.3V and the datasheet states the maximum voltage is acceptable, then it is ok. Is it the same for all micros? No - refer to the datasheet. For example, there are some parts that the adc maximum is 1.8V although the chip is powered by 3.3V.

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I did look at the datasheet.  I think it's OK, since there was nothing stated, besides the absolute max for any pin, which is Vdd+0.3V.  I'll reply again if I destroy my SAMD20

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hi wannabe,

i am also using samd20 board, in data sheet they gave external ref can give through PA03, my doubt what is the maximum voltage we can measure.

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If your device is powered by 3.3V, then you can't measure beyond that.