Datasheet

8. Power Supply and Start-Up Considerations
8.1 Power Domain Overview
VOLTAGE
REGULATOR
VDDIN
VDDCORE
GND
DAC
PTC
XOSC32K
OSC32K
VDDANA
GNDANA
PA[7:2]
PB[9:0]
PA[1:0]
Digital Logic
(CPU, peripherals)
DFLL48M
VDDIO
OSC8M
XOSC
OSCULP32K
PA[31:16]
PB[31:10]
PA[15:14]
BOD33
POR
PA[13:8]
BOD12
FDPLL96M
ADC
AC
AC1
8.2 Power Supply Considerations
8.2.1 Power Supplies
The device has several different power supply pins:
• VDDIO: Powers I/O lines, OSC8M and XOSC. Voltage is 1.62V to 3.63V.
• VDDIN: Powers I/O lines and the internal regulator. Voltage is 1.62V to 3.63V.
• VDDANA: Powers I/O lines and the ADC, AC, DAC, PTC, OSCULP32K, OSC32K, XOSC32K.
Voltage is 1.62V to 3.63V.
• VDDCORE: Internal regulated voltage output. Powers the core, memories, peripherals, FDPLL96M,
and DFLL48M. Voltage is 1.2V.
The same voltage must be applied to both VDDIN, VDDIO and VDDANA. This common voltage is
referred to as V
DD
in the datasheet.
The ground pins, GND, are common to VDDCORE, VDDIO and VDDIN. The ground pin for VDDANA is
GNDANA.
SAM D21 Family
Power Supply and Start-Up Considerations
© 2018 Microchip Technology Inc.
Datasheet Complete
DS40001882D-page 35