Atmel ARM-Based Evaluation Kit for SAM4S16C, 32-Bit ARM® Cortex® Microcontroller ATSAM4S-WPIR-RD ATSAM4S-WPIR-RD Data Sheet

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SAM4S Series [DATASHEET]

Atmel-11100G-ATARM-SAM4S-Datasheet_27-May-14

The SAM4S has several types of power supply pins:



VDDCORE pins: Power the core, the first flash rail and the embedded memories and peripherals. Voltage 

ranges from 1.08V to 1.32V.



VDDIO pins: Power the peripheral I/O lines (input/output buffers), the second Flash rail, USB transceiver, 

backup part, 32 kHz crystal oscillator and oscillator pads. Voltage ranges from 1.62V to 3.6V.



VDDIN pin: Voltage regulator input, ADC, DAC and analog comparator power supply. Voltage ranges from 

1.62V to 3.6V.



VDDPLL pin: Powers the PLLA, PLLB, the fast RC and the 3 to 20 MHz oscillator. Voltage ranges from 

1.08V to 1.32V.

The SAM4S embeds a voltage regulator that is managed by the Supply Controller.
This internal regulator is designed to supply the internal core of SAM4S It features two operating modes:



In Normal mode, the voltage regulator consumes less than 500 µA static current and draws 80 mA of output 

current. Internal adaptive biasing adjusts the regulator quiescent current depending on the required load 

current. In Wait Mode quiescent current is only 5 µA.



In Backup mode, the voltage regulator consumes less than 1µA while its output (VDDOUT) is driven 

internally to GND. The default output voltage is 1.20V and the start-up time to reach Normal mode is less 

than 300 µs.

For adequate input and output power supply decoupling/bypassing, refer to the “Voltage Regulator” section in the 

“Electrical Characteristics” section of the datasheet.