I/Os 3.3V if Micro powered at 1.8V?

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I/Os 3.3V if Micro powered at 1.8V?

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gsosnow
Contributor II

We are using the MK22FN512CBP12R, powered at 1.8V. Was wondering if the I/Os would be tolerant in some configuration to operate with 3.3V levels? The pins we are connecting to are open drain 3.3V, so they would have pullups to 3.3V. Could the Kinetis 1.8V digital I/O be connetced in some configuration to operate correctly in this scenario, either as is or configured as open drain, as well?

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Hui_Ma
NXP TechSupport
NXP TechSupport

Hi

When customer using MK22FN512CBP12R with VDD 1.8V, the open drain pin pull up voltage must be same with VDD (1.8V). MK22FN512CBP12R  datasheet also shows the same info at table1 :

pastedImage_3.png


Wish it helps.

Have a great day,
Ma Hui
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