Power Management Controller (PMC)MPC5644A Microcontroller Reference Manual, Rev. 6Freescale Semiconductor 1637Figure 35-2. Bandgap reference block diagram35.2 External signal descriptionTable 35-1 provides an overview of the PMC supply signals.35.2.1 Detailed signal descriptionsThis section provides the descriptions of external signals coming into and going out of the powermanagement control unit.Table 35-1. Power management controller external signals (maximum ratings)Name Type Voltage DescriptionVDDREG Supply 4.5 – 5.5 V Power supply for the voltage regulatorVDDEH1 Supply 2.7 – 5.5 V Power supply of the closest I/O segmentVRC33 1, 21 This table represents the maximum variation of the supply when internal regulators are used. For externalpower supply requirements check the PMC electrical specifications in the “PMC Operating Conditions andExternal Regulators Voltage” table in the device data sheet.2 Within the PMC block, the signal VDD33 is the output of the internal 3.3 V voltage regulator and the signalVRC33 is used as the feedback of the internal 3.3 V voltage regulator. These signals are shorted togetheron the production package. Throughout this document, references to VRC33 and VDD33 refer to theproduction package signal VRC33.Supply 3.3 – 3.6 V 3.3 V bypass capacitor or 3.3 V external power supplyVDD Supply 1.2 – 1.32 V 1.2 V supply from external ballast transistorVSSREG Ground — Ground supply for digital core and PMCVRCCTL Output — Regulator drive for external npn baseBandgapReference VBGAbsolute RefVBGBufferVBG TrimPOR-vddregVBGABS trimVBGrefVDDREGDVSSVBGref VREF_buffAVSSAVSSAVSSDVSSVDDREGVDDREG
