Atmel Xplained Pro Evaluation Kit for the ATSAMD21J18A Microcontroller ATSAMD21-XPRO ATSAMD21-XPRO Data Sheet
Product codes
ATSAMD21-XPRO
19
Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181C–SAM-D21_Datasheet–07/2014
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.
for details.
7.2.2
Voltage Regulator
The SAM D21 voltage regulator has two different modes:
z
Normal mode: To be used when the CPU and peripherals are running
z
Low Power (LP) mode: To be used when the regulator draws small static current. It can be used in standby mode
7.2.3
Typical Powering Schematics
The SAM D21 uses a single supply from 1.62V to 3.63V.
The following figure shows the recommended power supply connection.
Figure 7-1. Power Supply Connection
7.2.4
Power-Up Sequence
7.2.4.1 Minimum Rise Rate
The integrated power-on reset (POR) circuitry monitoring the VDDANA power supply requires a minimum rise rate. Refer
to the
to the
for details.
7.2.4.2 Maximum Rise Rate
The rise rate of the power supply must not exceed the values described in Electrical Characteristics. Refer to the
for details.
(1.62V — 3.63V)
Main Supply
VDDIO
VDDANA
VDDIN
VDDCORE
GND
GNDANA
SAM D21