6.13.3 Auxiliary Supply System (Link to User's Guide)

The auxiliary supply system provides the option to operate the device from auxiliary supplies when the primary supply fails. Two auxiliary supplies (AUXVCC1 and AUXVCC2) are supported in the MSP430F67xx MCUs. The auxiliary supply system supports automatic and manual switching from primary supply to auxiliary supplies while maintaining full functionality. The auxiliary supply system allows threshold-based monitoring of primary and auxiliary supplies. The device can be started from primary supply or AUXVCC1, whichever is higher. Auxiliary supply system enables internal monitoring of voltage levels on primary and auxiliary supplies using ADC10_A. This module also implements a simple charger for backup capacitors.