Data Sheet

1008
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181G–SAM-D21_Datasheet–09/2015
38. Schematic Checklist
38.1 Introduction
This chapter describes a common checklist which should be used when starting and reviewing the schematics for a
SAM D21 design. This chapter illustrates a recommended power supply connection, how to connect external analog
references, programmer, debugger, oscillator and crystal.
38.2 Power Supply
The SAM D21 supports a single power supply from 1.62 to 3.63V.
38.2.1 Power Supply Connections
Figure 38-1. Power Supply Schematic
Table 38-1. Power Supply Connections, V
DDCORE
From Internal Regulator
Signal Name Recommended Pin Connection Description
V
DDIO
1.6V to 3.6V
Decoupling/filtering capacitors 100nF
(1)(2)
and 10µF
(1)
Decoupling/filtering inductor 10µH
(1)(3)
Digital supply voltage
V
DDANA
1.6V to 3.6V
Decoupling/filtering capacitors 100nF
(1)(2)
and 10µF
(1)
Ferrite bead
(4)
prevents the V
DD
noise interfering the
V
DDANA
Analog supply voltage
10μF
100nF
1.62V - 3.63V
Close to device
(for every pin)
VDDANA
GNDANA
VDDIO
VDDIN
VDDCORE
GND
10μF
100nF
100nF
1μF