The Multi-Voltage I/O (MVIO) module provides a group of I/O pins powered from an alternative
voltage domain separate from VDD. Similar to how standard I/O pins run and operate based
on the voltage supplied using the VDD supply pin(s) of the device, the MVIO pins run and
operate based on their voltage supplied using the VDDIOx supply pin(s) of the device. The
VIL/VIH and VOL/VOH voltage levels on MVIO pins scale
based on the VDDIOx voltage, allowing them to have the same digital functionality as
standard I/O pins on the VDD domain, including GPIO, serial communication, Pulse-Width
Modulation, and PPS functionality for PIC devices. Additionally, the MVIO voltage domain(s) will
remain operational in Sleep mode and when the CPU is halted in Debug mode as long as the
corresponding VDDIOx supply voltage remains active. Refer to the electrical
specifications section of the device data sheet for more information.
Attention: Not all device families that offer MVIO support analog functionality on those pins.
Refer to the data sheet for more information.
The MVIO module can provide multiple alternative voltage domains associated with a select group
of pins, so it is important to refer to the device data sheet for more information about how many
voltage domains are available on each device family and pins dedicated to each domain. To determine
how many voltage domains are available and which pins lie within each MVIO domain, refer to the
“Pin Diagrams” or “Pinout” section of the device data sheet. The provided pin diagrams
in the data sheet give a visual representation showing where each power supply pin is
(VDD and all VDDIOx pins), and which voltage domain each I/O pin operates from
for every available package within that specific device family. Figure 1-1 and Figure 1-2 are examples of the pin diagrams
for a PIC device and an AVR device respectively, with MVIO for reference. Figure 1-1. 28-Pin SPDIP, SSOP and SOIC from
PIC18F26/45/46/55/56Q24 Device Data SheetFigure 1-2. 48-pin VQFN and TQFP from AVR128DB28/32/48/64
Device Data Sheet
The online versions of the documents are provided as a courtesy. Verify all content and data in the device’s PDF documentation found on the device product page.