ATmega32U4 Atmel Corporation, ATmega32U4 Datasheet - Page 254

• Manufacturer Part Number: ATmega32U4
• Manufacturer: Atmel Corporation

Specifications of ATmega32U4

• Flash (kbytes): 32 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 14
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 26
• Ext Interrupts: 13
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 12
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 3.3
• Eeprom (bytes): 1024
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 2.7 to 5.5
• Operating Voltage (vcc): 2.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 4
• Output Compare Channels: 12
• Input Capture Channels: 2
• Pwm Channels: 8
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

21.3
21.3.1
7766F–AVR–11/10
Typical Application Implementation
Bus Powered device
Depending on the target application power supply, the ATmega16U4/ATmega32U4 requires dif-
ferent hardware typical implementations.
Figure 21-2. Operating modes versus frequency and power-supply
Figure 21-3. Typical Bus powered application with 5V I/O
VBUS
UVSS
UDP
UDM
UID
VCC min
5.5
4.5
3.6
3.4
3.0
2.7
0
Rs=22
Rs=22
VCC (V)
USB compliant,
with internal regulator
1µF
USB not operational
USB compliant,
without internal regulator
UCAP
VBUS
UGND
D+
D-
UID
UVCC
XTAL1
XTAL2
AVCC
Max
Operating Frequency (MHz)
GND
16 MHz
8 MHz
2 MHz
ATmega16/32U4
VCC
GND
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