Power Considerations - Atmel AT32UC3A3256S Manual

32-bit avr microcontroller
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3.5

Power Considerations

3.5.1
Power Supplies
3.5.2
Voltage Regulator
32072H–AVR32–10/2012
The AT32UC3A3 has several types of power supply pins:
VDDIO: Powers I/O lines. Voltage is 3.3V nominal
VDDANA: Powers the ADC. Voltage is 3.3V nominal
VDDIN: Input voltage for the voltage regulator. Voltage is 3.3V nominal
VDDCORE: Output voltage from regulator for filtering purpose and provides the supply to the
core, memories, and peripherals. Voltage is 1.8V nominal
The ground pin GNDCORE is common to VDDCORE and VDDIN. The ground pin for VDDANA
is GNDANA. The ground pins for VDDIO are GNDIO.
Refer to Electrical Characteristics chapter for power consumption on the various supply pins.
The AT32UC3A3 embeds a voltage regulator that converts from 3.3V to 1.8V with a load of up
to 100 mA. The regulator takes its input voltage from VDDIN, and supplies the output voltage on
VDDCORE and powers the core, memories and peripherals.
Adequate output supply decoupling is mandatory for VDDCORE to reduce ripple and avoid
oscillations.
The best way to achieve this is to use two capacitors in parallel between VDDCORE and
GNDCORE:
• One external 470pF (or 1nF) NPO capacitor (C
chip as possible.
• One external 2.2µF (or 3.3µF) X7R capacitor (C
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, e.g., two capacitors can be
used in parallel (1nF NPO and 4.7µF X7R).
3.3V
C
1.8V
C
For decoupling recommendations for VDDIO and VDDANA please refer to the Schematic
checklist.
C
IN1
IN2
C
OUT2
OUT1
AT32UC3A3
) should be connected as close to the
OUT1
).
OUT2
VDDIN
Regulator
VDDCORE
1.8V
20

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