AT32UC3L-EK Atmel, AT32UC3L-EK Datasheet - Page 36

• Manufacturer Part Number: AT32UC3L-EK
• Description: KIT EVAL AVR32 UC3 MCU
• Manufacturer: Atmel
• Type: MCUr

Specifications of AT32UC3L-EK

• Contents: *
• Silicon Manufacturer: Atmel
• Core Architecture: AVR
• Core Sub-architecture: UC3L
• Kit Contents: Board
• Features: USB / Battery Powered, Board Controller / Bootloader
• Svhc: No SVHC (15-Dec-2010)
• Rohs Compliant: Yes
• Tool Type: Starter Kit
• Cpu Core: AVR 8
• Data Bus Width: 8 bit
• Processor Series: AT32
• Processor To Be Evaluated: AT32UC3L064
• Interface Type: USB, Capacitive Touch
• For Use With/related Products: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

6. Supply and Startup Considerations
6.1
6.1.1
6.1.2
6.1.3
32099F–11/2010
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, 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 AT32UC3L 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 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
796
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
for decoupling capacitors values and regulator characteristics.
Section 32. on page 782
Supply Decoupling
C
Section 6.1.3
IN3
C
C
for regulator connection figures.
OUT2
for power consumption on the various supply pins.
IN2
C
C
OUT1
IN1
VDDCORE
AT32UC3L016/32/64
VDDIN
Section 32.9.1 on page
Regulator
1.8V
36