The PMM includes an integrated voltage regulator that supplies the core voltage to the device. The PMM also includes supply voltage supervisor (SVS) and brownout protection. The brownout reset circuit (BOR) is implemented to provide the proper internal reset signal to the device during power on and power off. The SVS circuitry detects if the supply voltage drops below a user-selectable safe level. SVS circuitry is available on the primary supply.
The device contains two on-chip references: 1.5 V for internal reference and 1.2 V for external reference.
The 1.5-V reference is internally connected to ADC channel 13. DVCC is internally connected to ADC channel 15. When DVCC is set as the reference voltage for ADC conversion, the DVCC can be easily represent as Equation 1 by using the ADC sampling the 1.5-V reference without any external components support.
The 1.5-V reference is also internally connected to the comparator built-in DAC as reference voltage. DVCC is internally connected to another source of the DAC reference, and both are controlled by the CPDACREFS bit. For more detailed information, see the Comparator chapter of the MSP430FR4xx and MSP430FR2xx Family User's Guide.
A 1.2-V reference voltage can be buffered and output to P1.7/TDO/A7/VREF+, when EXTREFEN = 1 in the PMMCTL2 register. ADC channel 7 can also be selected to monitor this voltage. For more detailed information, see the MSP430FR4xx and MSP430FR2xx Family User's Guide.
The ADC is not available on the MSP430FR2000 device.