ATSAM3N0AA-AU Datasheet, PDF (17/60 Pages) ATMEL Corporation – ARM-based Flash MCU

SAM3N Summary
5. Power Considerations
5.1 Power Supplies
The SAM3N product has several types of power supply pins:
• VDDCORE pins: Power the core, including the processor, the embedded memories and the
peripherals. Voltage ranges from 1.62V and 1.95V.
• VDDIO pins: Power the Peripherals I/O lines, Backup part, 32 kHz crystal oscillator and
oscillator pads. Voltage ranges from 1.62V and 3.6V
• VDDIN pin: Voltage Regulator, ADC and DAC Power Supply. Voltage ranges from 1.8V to
3.6V for the Voltage Regulator
• VDDPLL pin: Powers the PLL, the Fast RC and the 3 to 20 MHz oscillators. Voltage ranges
from 1.62V and 1.95V.
5.2 Voltage Regulator
The SAM3N embeds a voltage regulator that is managed by the Supply Controller.
This internal regulator is intended to supply the internal core of SAM3N. It features two different
operating modes:
• In Normal mode, the voltage regulator consumes less than 700 µA static current and draws
60 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 7 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 1.80V and the start-up time to reach
Normal mode is less than100 µs.
For adequate input and output power supply decoupling/bypassing, refer to the Voltage Regula-
tor section in the Electrical Characteristics section of the datasheet.
5.3 Typical Powering Schematics
The SAM3N supports a 1.62V-3.6V single supply mode. The internal regulator input connected
to the source and its output feeds VDDCORE. Figure 5-1 shows the power schematics.
As VDDIN powers the voltage regulator and the ADC/DAC, when the user does not want to use
the embedded voltage regulator, it can be disabled by software via the SUPC (note that it is dif-
ferent from Backup mode).
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