AT32UC3A3
4.4 Power Considerations
4.4.1
Power Supplies
The AT32UC3A3 has several types of power supply pins:
• VDDIO: Powers I/O lines. Voltage is 3.3V nominal
• VDDANA: Powers the ADC Voltage and provides the ADVREF 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 pins GNDCORE are common to VDDCORE and VDDIN. The ground pin for
VDDANA is GNDANA. The ground pin for VDDIO is GNDIO.
Refer to Electrical Characteristics chapter for power consumption on the various supply pins.
4.4.2
Voltage Regulator
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 (COUT1) should be connected as close to the
chip as possible.
• One external 2.2µF (or 3.3µF) X7R capacitor (COUT2).
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 (100nF NPO and 4.7µF X7R).
3.3V
1.8V
CIN2
COUT2
VDDIN
CIN1 ONREG
1.8V
Regulator
COUT1
VDDCORE
ONREG input must be tied to VDDIN.
17
32072A–AVR32–03/09