Power Supplies

The SAM C20 has several different power supply pins:

• VDDIO: Powers I/O lines and XOSC. Voltage is 2.70V to 5.50V.
• VDDIN: Powers I/O lines and the OSC48M, TOSC and internal regulator. Voltage is 2.70V to 5.50V.
• VDDANA: Powers I/O lines and the ADC, AC, PTC, OSCULP32K, OSC32K and XOSC32K. Voltage is 2.70V to 5.50V.
• VDDCORE: Internal regulated voltage output. Powers the core, memories, peripherals, and FDPLL96M. Voltage is 1.2V typical.

The same voltage must be applied to both VDDIN and VDDANA. This common voltage is referred to as V_DD in the datasheet. VDDIO must always be less than or equal to VDDIN.

The ground pins, GND, are common to VDDCORE, VDDIO and VDDIN. The ground pin for VDDANA is GNDANA.

For decoupling recommendations for the different power supplies, refer to the schematic checklist.