Here's a curiosity: The errata sheet (SLAS457J) lists ----------------------------------- PMM24: Device may enter lockup state during wake-up from LPM3 and LPM4 The device may enter a lockup state during an interrupt-triggered wake up from LPM3 or LPM4. The device will remain in lockup state, unable to respond to the interrupt or continue application execution, until a power cycle brings it back to reset state Workaround 1) Use LPM2 instead of LPM3 or LPM4. ----------------------------------- That's not many pre-conditions to meet. Maybe the I2C thing is a red herring? Trying LPM2 is probably quicker than wondering.
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