Atmel Xplained Pro Evaluation Kit for the ATSAMD21J18A Microcontroller ATSAMD21-XPRO ATSAMD21-XPRO Data Sheet
Product codes
ATSAMD21-XPRO
976
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181C–SAM-D21_Datasheet–07/2014
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.
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
Decoupling/filtering capacitors 100nF
and 10µF
Decoupling/filtering inductor 10µH
Digital supply voltage
V
DDANA
1.6V to 3.6V
Decoupling/filtering capacitors 100nF
Decoupling/filtering capacitors 100nF
and 10µF
Ferrite bead
prevents the V
DD
noise interfering the
V
DDANA
Analog supply voltage
VDDANA
GNDANA
VDDIN
VDDIO
VDDCORE
GND
100nF
100nF
100nF
1.62V-3.63V
10µF
100nF
10µF
Close to device
(for every pin)