The following figure shows the detailed view of the power subsystem on the PIC32CX-BZ6 device.Figure 8-1. Power Subsystem Block Diagram
The power domains of PIC32CX-BZ6 SoC are as follows:
VDD – 1.9–3.6V, Main Supply powering VDDIO, FLASH_VDD, AVDD, PMU_VDDIO, PMU_VDDP and VUSB3V3. All other supplies are derived from VDD with or without filtering.
VDDIO
1.9 to 3.6V, powering the Always ON (AON ), PMU Controller, AN/GPIO, INT0/NMCLR, BKUP
FLASH_AVDD
1.9V to 3.6V, filtered version of VDD (powering the Flash)
AVDD
1.9V to 3.6V, filtered version of VDD for system analog functionality
PMU_VDDIO
1.9 to 3.6V, filtered version of VDD (powering the PMU sub-system)
PMU_VDDP
1.9 to 3.6V, filtered version of VDD (powering the PMU sub-system)
VUSB3V3
3 to 3.6V, filtered version of VDD (powering USB transceiver supply)
GND
Common GND for digital, analog and RF sub-systems
Other power supply pins as follows:
CLDO_OUT, RF LDO OUT (1.2V ± 5%)
Output pin for the internal voltage regulator for decoupling, do not use this pin as an external power supply source
CLDO_IN, VDD_RF
Loop back path for the CLDO and RF LDO power after external filtering
BUCK_PA, BUCK_CLDO, PLL_VDD, SOC_LDO_VDD
1.35V input for all the regulators in the SOC
Powered with 1.35V ± 5% from the combination of DC-DC, MLDO and external board filtering
PMU_BK_LX
Pin for connecting the inductor for the internal switching regulator
PMU_MLDO_OUT (1.35V ± 3.7%)
1.35V PMU output pin. This is the shared output pin for both MLDO and the DC-DC converter
MLDO_OUT powers the internal LDO’s in the Bluetooth/802.15.4 subsystem
For decoupling recommendations for the different power supplies, refer to the schematic checklist.