Atmel SAM4S-XPLD Atmel ATSAM4S-XPLD ATSAM4S-XPLD Hoja De Datos

 20

SAM4S [DATASHEET]

11100E–ATARM–24-Jul-13

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 Peripherals 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 1

μA 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.

The SAM4S supports a 1.62V-3.6V single supply mode. The internal regulator input is connected to the source and its
output feeds VDDCORE. 

below

 

shows the power schematics.

As VDDIN powers the voltage regulator, the ADC, DAC and the analog comparator, when the user does not want to use
the embedded voltage regulator, it can be disabled by software via the SUPC (note that this is different from Backup
mode).

Note:

Restrictions
For USB, VDDIO needs to be greater than 3.0V.

Main Supply
(1.62V-3.6V)

ADC, DAC

Analog Comp.

USB

Transceivers.

VDDIN

Voltage

Regulator

VDDOUT

VDDCORE

VDDIO

VDDPLL