3.
Hardware Configuration
3.1
Using the Curiosity Nano AVR128DB48
To illustrate the capabilities of Multi-Voltage I/O an AVR128DB48 Curiosity Nano is used. Schematics of the Curiosity
Nano PCB can be found in the
section. To enable MVIO on this development board, perform the below
steps:
1.
Remove the resistor right below the VDDIO2 label to disconnect VDDIO2 from VDD. This is resistor R204 in
2.
Connect to 3.3V of a second power voltage source.
3.
Connect VDDIO2 - to GND of a second voltage source.
AVR123DB48 Curiosity Nano User Guide
for a guide on how to reverse this process.
Any voltage between 1.8V and 5.5V may be applied to VDDIO2, but for the following examples, we will run at 3.3V.
Figure 3-1. AVR128DB48 Curiosity Nano MVIO
1
2
3
Figure 3-2. Snippet From the AVR128DB48 Curiosity Nano Schematic
3.2
Supplying Power To VDDIO2
The Multi-Voltage I/O (MVIO) can be configured in one of two supply modes:
TB3287
Hardware Configuration
©
2020 Microchip Technology Inc.
Technical Brief
DS90003287A-page 7
