4.3 PIC32MX Power Requirements

Devices in the PIC32MX family are dual voltage supply designs. There is one supply for the core and another for peripherals and I/O pins. All devices contain an on-chip regulator for the lower voltage core supply to eliminate the need for an additional external regulator. There are three implementations of the on board regulator:
  • The first version has an internal regulator that can be disabled using the ENVREG pin. When disabled, an external power supply must be used to power the core. If enabled, a low-ESR filter capacitor must be connected to the VCAP pin, see Figure 4-2.
  • The second version has an internal regulator that cannot be disabled. A low-ESR filter capacitor must always be connected to the VCAP pin.
  • The third version has an internal regulator that cannot be disabled and does not require a filter capacitor

Refer to “AC/DC Characteristics and Timing Requirements” and the “Electrical Characteristics” chapter in the specific device data sheet for the power requirements of the device.

Figure 4-2. Internal Regulator Enable/Disable Options
Note:
  1. These are typical operating voltages. Refer to the AC/DC Characteristics and Timing Requirements for the full operating ranges of VDD and VCAP.
  2. Regulator Enabled and Regulator Disabled mode are not available on all devices. Refer to the specific device data sheet to determine availability.