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MSP430FR5962: MSP430FR5962 in a humid environment

Part Number: MSP430FR5962

Hi Expert,

One customer is using MSP430FR5962 in a humid environment and finding the controller can't work well. Open the casing, there are some condensation on the internal casing surface but no obvious water drops can be seen on the PCB surface. Is there any method to make this device can operate better in the humid environment?