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MSP430F5340: First time power up issue

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Part Number:MSP430F5340

The MSP430F5340 is being used in a basic design on a board (drives a couple LED's based on analog input voltage from a Hall Effect sensor). The first time the board is powered up the MSP comes up in an error state. If power is cycled the MSP comes up correctly and works correctly from then on.

This board previously didn't have this problem. One difference I noted was that the die revision code on the MSP430F5340 is changed from I to K.

The older MSP marking is M430F5340 TI 3AI I AYH2 G4.

The newer MSP marking is M430F5340 TI 62I K C2PC G4.

Looking at the Errata sheet for the MSP430F5340 the only issue I noted that can be fixed by power cycling is JTAG 20, but that is common to both I and K die revisions.

I am in the process of getting an MSP430F programmer which should allow me to look at the state of the MSP on first power up versus second power up.

Any advice - maybe this problem has cropped up before - would be appreciated.


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