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Atmel | SMART SAM D21 [DATASHEET]
Atmel-42181G–SAM-D21_Datasheet–09/2015
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.
Refer to “Schematic Checklist” on page 1008 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 “Electrical Characteristics” on page 935 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
“Electrical Characteristics” on page 935 for details.