Atmel MCU Evaluation Kit AT91SAM7X-EK AT91SAM7X-EK Data Sheet

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SAM7X Series [SUMMARY DATASHEET]

6120IS–ATARM–14-Nov-13

The SAM7X512/256/128 has six types of power supply pins and integrates a voltage regulator, allowing the device to be 
supplied with only one voltage. The six power supply pin types are:



VDDIN pin. It powers the voltage regulator and the ADC; voltage ranges from 3.0V to 3.6V, 3.3V nominal. In order 
to decrease current consumption, if the voltage regulator and the ADC are not used, VDDIN, ADVREF, AD4, AD5, 
AD6 and AD7 should be connected to GND. In this case, VDDOUT should be left unconnected.



VDDOUT pin. It is the output of the 1.8V voltage regulator.



VDDIO pin. It powers the I/O lines; voltage ranges from 3.0V to 3.6V, 3.3V nominal.



VDDFLASH pin. It powers the USB transceivers and a part of the Flash and is required for the Flash to operate 
correctly; voltage ranges from 3.0V to 3.6V, 3.3V nominal.



VDDCORE pins. They power the logic of the device; voltage ranges from 1.65V to 1.95V, 1.8V typical. It can be 
connected to the VDDOUT pin with decoupling capacitor. VDDCORE is required for the device, including its 
embedded Flash, to operate correctly.



VDDPLL pin. It powers the oscillator and the PLL. It can be connected directly to the VDDOUT pin.

No separate ground pins are provided for the different power supplies. Only GND pins are provided and should be 
connected as shortly as possible to the system ground plane.

The SAM7X512/256/128 has a static current of less than 60 

μA on VDDCORE at 25°C, including the RC oscillator, the 

voltage regulator and the power-on reset when the brownout detector is deactivated. Activating the brownout detector 
adds 28 

μA static current.

The dynamic power consumption on VDDCORE is less than 90 mA at full speed when running out of the Flash. Under 
the same conditions, the power consumption on VDDFLASH does not exceed 10 mA.

The SAM7X512/256/128 embeds a voltage regulator that is managed by the System Controller.

In Normal Mode, the voltage regulator consumes less than 100 

μA static current and draws 100 mA of output current.

The voltage regulator also has a Low-power Mode. In this mode, it consumes less than 25 

μA static current and draws 1 

mA of output current.

Adequate output supply decoupling is mandatory for VDDOUT to reduce ripple and avoid oscillations. The best way to 
achieve this is to use two capacitors in parallel: one external 470 pF (or 1 nF) NPO capacitor should be connected 
between VDDOUT and GND as close to the chip as possible. One external 2.2 

μF (or 3.3 μF) X7R capacitor should be 

connected between VDDOUT and GND.

Adequate input supply decoupling is mandatory for VDDIN in order to improve startup stability and reduce source voltage 
drop. The input decoupling capacitor should be placed close to the chip. For example, two capacitors can be used in 
parallel: 100 nF NPO and 4.7 

μF X7R.

The SAM7X512/256/128 supports a 3.3V single supply mode. The internal regulator input connected to the 3.3V source 
and its output feeds VDDCORE and the VDDPLL. 

powered systems.