What kind of input protection does the nrf51822 have ?

RE: What kind of input protection does the nrf51822 have ?

Håkon Alseth — Tue, 29 Oct 2013 10:52:51 GMT

Hi Gus,

The GPIOs have an over-voltage protection circuit. If you go outside the maximum ratings, -0.3V or VDD+0.3V, then you may trigger the over-voltage diode(s) and blow the GPIO. Then the GPIO will be shorted either to VDD or VSS, and you will get an excessive current draw.

Best regards Håkon

RE: What kind of input protection does the nrf51822 have ?

Gus S. Calabrese — Mon, 28 Oct 2013 23:05:20 GMT

Thank you Ole Morton ....... I had already seen the data you suggested.

I would like to find out if the inputs have protection diodes and if so, what amount of current will they tolerate. Or perhaps the inputs have a different geometry. I would like as many details as I can get. I have found these kind of details about other chips and find such information useful. Gus

RE: What kind of input protection does the nrf51822 have ?

Ole Morten — Mon, 28 Oct 2013 10:38:33 GMT

I'm not quite sure I understand exactly what you need to know. Have you had a look at the Absolute maximum ratings in the nRF51822 Product Specification? As it says there, the maximum legal voltage for any I/O is VDD+0.3 V.

Also, for the ADC pins, have you seen this question?