AT32UC3A3256-CTUT Atmel, AT32UC3A3256-CTUT Datasheet - Page 18

• Manufacturer Part Number: AT32UC3A3256-CTUT
• Description: IC MCU AVR32 256KB FLASH 144TBGA
• Manufacturer: Atmel
• Series: AVR®32 UC3r

Specifications of AT32UC3A3256-CTUT

• Core Processor: AVR
• Core Size: 32-Bit
• Speed: 66MHz
• Connectivity: EBI/EMI, I²C, IrDA, MMC, SPI, SSC, UART/USART, USB OTG
• Peripherals: Brown-out Detect/Reset, DMA, POR, WDT
• Number Of I /o: 110
• Program Memory Size: 256KB (256K x 8)
• Program Memory Type: FLASH
• Ram Size: 128K x 8
• Voltage - Supply (vcc/vdd): 1.65 V ~ 1.95 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 144-TBGA
• Processor Series: AT32UC3x
• Core: AVR32
• Data Bus Width: 32 bit
• Data Ram Size: 96 KB
• Interface Type: IrDA/SCI/SCIF/UDI
• Maximum Clock Frequency: 66 MHz
• Number Of Timers: 3
• Operating Supply Voltage: 3 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR32, EWAVR32-BL, KSK-EVK1100-PL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT, ATEXTWIFI, ATEVK1104
• Minimum Operating Temperature: - 40 C
• For Use With: ATEVK1104 - KIT DEV/EVAL FOR AVR32 AT32UC3AATAVRONEKIT - KIT AVR/AVR32 DEBUGGER/PROGRMMRATEVK1100 - KIT DEV/EVAL FOR AVR32 AT32UC3A
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

7.2
7.2.1
7.2.2
32058HS–AVR32–03/09
Voltage Regulator
Single Power Supply
Dual Power Supply
The AT32UC3A embeds a voltage regulator that converts from 3.3V to 1.8V. The regulator takes
its input voltage from VDDIN, and supplies the output voltage on VDDOUT. VDDOUT should be
externally connected to the 1.8V domains.
Adequate input supply decoupling is mandatory for VDDIN in order to improve startup stability
and reduce source voltage drop. Two input decoupling capacitors must be placed close to the
chip.
Adequate output supply decoupling is mandatory for VDDOUT to reduce ripple and avoid oscil-
lations. The best way to achieve this is to use two capacitors in parallel between VDDOUT and
GND as close to the chip as possible
Refer to
In case of dual power supply, VDDIN and VDDOUT should be connected to ground to prevent
from leakage current.
3.3V
1.8V
Section 12.3 on page 42
C
C
OUT2
IN2
for decoupling capacitors values and regulator characteristics
C
C
IN1
OUT1
VDDIN
VDDOUT
VDDIN
VDDOUT
Regulator
AT32UC3A
1.8V
18