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Effect of low temperature to GPIO's schmitt trigger threshold

Other Parts Discussed in Thread: MSP430F1122

Hi Team,

A customer is using MSP430F1122 and they are having issue of missing GPIO interrupt at low temperatures (-10 degC). The MSP is powered by 3.6V battery, and they are feeding pulses between 2.8 - 3.2.V with 20us wide, rise/fall time around 2 us. 

At normal room temperature, they see that they are getting the correct GPIO interrupts, but they are missing in the low temperatures.

Is this something expected? What would be the approximate threshold in -10 degC for 3.6V supply?

Thanks.

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