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Atmel | SMART SAM R21 [PRELIMINARY DATASHEET SUMMARY]

Atmel-42223AS–SAM-R21_Summary–07/2014

4.

Pinout

4.1

SAM R21G - QFN48

Note:

The large center pad underneath the QFN package is made of metal and internally connected to GND.

It should be soldered and connected to the digital ground on the board to ensure good mechanical stability.

It is not recommended to use the exposed paddle as a replacement of the regular GND pin.

PA16

25

PA17

26

PA18

27

PA19

28

GND

29

DVDD

30

PA22

31

PA23

32

PA24

33

PA25

34

GND

35

VDDIO

36

PA00

1

PA01

2

XTAL2

3

XTAL1

4

GNDANA

5

VDDANA

6

AVDD

7

GNDANA

8

PA04

9

PA05

10

PA06

11

PA07

12

DIGITAL PIN

ANALOG PIN

OSCILLATOR

GROUND

INPUT SUPPLY

REGULATED OUTPUT SUPPLY

RESET PIN

RF PIN

DIGITAL PIN/

OSCILLATOR