ATmega16U4 Atmel Corporation, ATmega16U4 Datasheet - Page 380

• Manufacturer Part Number: ATmega16U4
• Manufacturer: Atmel Corporation

Specifications of ATmega16U4

• Flash (kbytes): 16 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): 2.1
• Eeprom (bytes): 512
• 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

29.3
29.4
29.5
7766F–AVR–11/10
7. Maximum regulator output current should be reduced by the USB buffer current required when USB is active (about 25mA).
8. As specified on the USB Electrical chapter, the D+/D- pads can withstand voltages down to -1V applied through a 39 Ohms
External Clock Drive Waveforms
External Clock Drive
Maximum speed vs. V
The remaining regulator output current can be used for the external application.
resistor
Figure 29-1. External Clock Drive Waveforms
Table 29-1.
Note:
Maximum frequency is depending on V
V
Symbol
CC
1/t
Δ
t
t
t
t
t
CHCX
CLCX
CLCH
CHCL
CLCL
t
CLCL
CLCL
curve is linear between 2.7V < V
All DC Characteristics contained in this datasheet are based on simulation and characterization of
other AVR microcontrollers manufactured in the same process technology. These values are pre-
liminary values representing design targets, and will be updated after characterization of actual
silicon.
CC
Parameter
Oscillator
Frequency
Clock Period
High Time
Low Time
Rise Time
Fall Time
Change in period
from one clock
cycle to the next
External Clock Drive
V
IL1
V
IH1
Min.
V
500
200
200
CC
0
=1.8-5.5V
CC
CC.
Max.
< 5.5V.
2.0
2.0
2
2
As shown in
Min.
V
125
50
50
CC
0
=2.7-5.5V
Figure
Max.
1.6
1.6
8
2
29-2, the Maximum Frequency vs.
ATmega16/32U4
V
Min.
62.5
25
25
CC
0
=4.5-5.5V
Max.
0.5
0.5
16
2
Units
MHz
μs
μs
ns
ns
ns
%
380