SLAZ102AB October 2012 – May 2021 CC430F6137
PMM Module
Functional
PMM supply overvoltage protection falsely triggers POR
The PMM Supply Voltage Monitor (SVM) high side can be configured as overvoltage protection (OVP) using the SVMHOVPE bit of SVSMHCTL register. In this mode a POR should typically be triggered when DVCC reaches ~3.75V.
If the OVP feature of SVM high side is enabled going into LPM234, the SVM might trigger at DVCC voltages below 3.6V (~3.5V) within a few ns after wake-up. This can falsely cause an OVP-triggered POR. The OVP level is temperature sensitive during fail scenario and decreases with higher temperature (85 degC ~3.2V).
Use automatic control mode for high-side SVS & SVM (SVSMHCTL.SVSMHACE=1). The SVM high side is inactive in LPM2, LPM3, and LPM4.