AT32UC3L064_11 ATMEL [ATMEL Corporation], AT32UC3L064_11 Datasheet - Page 36

• Manufacturer Part Number: AT32UC3L064_11
• Description: 32-bit Atmel AVR Microcontroller
• Manufacturer: ATMEL [ATMEL Corporation]

6. Supply and Startup Considerations
6.1
6.1.1
6.1.2
6.1.3
32099HS–12/2011
Supply Considerations
Power Supplies
Voltage Regulator
Regulator Connection
The AT32UC3L016/32/64 has several types of power supply pins:
The ground pins GND are common to VDDCORE, VDDIO, and VDDIN. The ground pin for
VDDANA is GNDANA.
When VDDCORE is not connected to VDDIN, the VDDIN voltage must be higher than 1.98V.
Refer to
For decoupling recommendations for the different power supplies, please refer to the schematic
checklist.
The AT32UC3L016/32/64 embeds a voltage regulator that converts from 3.3V nominal to 1.8V
with a load of up to 60mA. The regulator supplies the output voltage on VDDCORE. The regula-
tor may only be used to drive internal circuitry in the device. VDDCORE should be externally
connected to the 1.8V domains. See
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 parallell between
VDDCORE and GND as close to the device as possible. Please refer to
55
Figure 6-1.
The AT32UC3L016/32/64 supports three power supply configurations:
3.3V
1.8V
•VDDIO: Powers I/O lines. Voltage is 1.8 to 3.3V nominal.
•VDDIN: Powers I/O lines and the internal regulator. Voltage is 1.8 to 3.3V nominal.
•VDDANA: Powers the ADC. Voltage is 1.8V nominal.
•VDDCORE: Powers the core, memories, and peripherals. Voltage is 1.8V nominal.
• 3.3V single supply mode
• 1.8V single supply mode
• 3.3V supply mode, with 1.8V regulated I/O lines
for decoupling capacitors values and regulator characteristics.
Section 7. on page 41
Supply Decoupling
C
IN3
for power consumption on the various supply pins.
C
C
OUT2
IN2
Section 6.1.3
C
C
OUT1
IN1
for regulator connection figures.
VDDCORE
AT32UC3L016/32/64
VDDIN
Section 7.8.1 on page
Regulator
1.8V
36