AT32UC3L064-AUTES ATMEL [ATMEL Corporation], AT32UC3L064-AUTES Datasheet - Page 36
AT32UC3L064-AUTES
Manufacturer Part Number
AT32UC3L064-AUTES
Description
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.AT32UC3L064-AUTES.pdf
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6. Supply and Startup Considerations
6.1
6.1.1
6.1.2
6.1.3
32099DS–06/2010
Supply Considerations
Power Supplies
Voltage Regulator
Regulator Connection
The AT32UC3L has several types of power supply pins:
The ground pins GND are common to VDDCORE and VDDIO. The ground pin for VDDANA is
GNDANA.
Refer to
The AT32UC3L embeds a voltage regulator that converts from 3.3V nominal to 1.8V with a load
of up to 60 mA. The regulator supplies the output voltage on VDDCORE. The regulator 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 chip as possible. Please refer to
for decoupling capacitors values and regulator characteristics.
Figure 6-1.
The AT32UC3L 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
Section 7. on page 41
Supply Decoupling
C
C
Section 6.1.3
OUT2
IN3
for power consumption on the various supply pins.
C
for regulator connection figures.
IN2
C
C
OUT1
IN1
VDDCORE
AT32UC3L016/32/64
VDDIN
Section 7.9.1 on page 50
Regulator
1.8V
36
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