Description

A fast transition on either PB0 or PB1 can switch on a low resistance path between one or both pins and ground potentially causing a high current draw.

This condition has been observed when the signal at the device pin has a rise time or fall time (measured from 10% to 90% of VDD) that is faster than 2 ns. The condition is more likely to occur at high temperatures or in noisy environments. It can occur when the pin is in input or output mode or with any pin multiplexing options.

If the condition is induced while the pin is configured as an output GPIO, then changing the pin state to low and then returning it to a high state at a lower temperature will resolve the condition.

Workaround

1. Do not use PB0 and PB1. Connect both to GND through a 1-kΩ resistor and configure them as GPIO inputs.
2. If PB0 and PB1 are used as USB0ID and USB0VBUS, see the USB section of System Design Guidelines for MSP432E4 Microcontrollers and confirm all guidelines contained in the document are followed.