7.1 Block Diagram
The following figure shows the detailed view of the power subsystem on the PIC32CX-BZ3 device.
The power domains of PIC32CX-BZ3 SoC are as follows:
- VDD – 1.9-3.6V, Main Supply powering VDDIO, FLASH_VDD, AVDD, PMU_VDDIO, PMU_VDDP. All other supplies are derived from VDD with or without filtering.
- VDDIO
- 1.9-3.6V, 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
- 1.9-3.6V, filtered version of VDD (powering the PMU sub-system)
- PMU_VDDP
- 1.9-3.6V, filtered version of VDD (powering the PMU sub-system)
- VDDIO
- GND
- Common GND for digital, analog and RF sub-systems
Other power supply pins as follows:
- CLDO_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 is powered with 1.35V ± 5% from the combination of DC-DC, MLDO and external board filtering
- VDDCORE is derived from CLDO_OUT
- Powers the core, memories and peripherals
- 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/Zigbee subsystem
For decoupling recommendations for the different power supplies, refer to the schematic checklist.