1 Multi-Voltage I/O (MVIO) Overview

The Multi-Voltage I/O (MVIO) module provides a group of I/O pins powered from an alternative voltage domain separate from V_DD. Similar to how standard I/O pins run and operate based on the voltage supplied using the V_DD supply pin(s) of the device, the MVIO pins run and operate based on their voltage supplied using the V_DDIOx supply pin(s) of the device. The V_IL/V_IH and V_OL/V_OH voltage levels on MVIO pins scale based on the V_DDIOx voltage, allowing them to have the same digital functionality as standard I/O pins on the V_DD 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 V_DDIOx supply voltage remains active. Refer to the electrical specifications section of the device 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 (V_DD and all V_DDIOx 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.