ATmega32U4 Atmel Corporation, ATmega32U4 Datasheet - Page 381

• 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

29.6
Table 29-2
wire Serial Interface meets or exceeds these requirements under the noted conditions.
Timing symbols refer to
Table 29-2.
7766F–AVR–11/10
Symbol
VIL
VIH
Vhys
VOL
tr
tof
tSP
I
C
f
Rp
t
t
i
SCL
HD;STA
LOW
(1)
i
(1)
(1)
(1)
(1)
(1)
2-wire Serial Interface Characteristics
describes the requirements for devices connected to the 2-wire Serial Bus. The ATmega16U4/ATmega32U4 2-
Parameter
Input Low-voltage
Input High-voltage
Hysteresis of Schmitt Trigger Inputs
Output Low-voltage
Rise Time for both SDA and SCL
Output Fall Time from V
Spikes Suppressed by Input Filter
Input Current each I/O Pin
Capacitance for each I/O Pin
SCL Clock Frequency
Value of Pull-up resistor
Hold Time (repeated) START Condition
Low Period of the SCL Clock
2-wire Serial Bus Requirements
Figure
Figure 29-2. Maximum Frequency vs. V
29-3.
IHmin
to V
16 MHz
ILmax
8 MHz
2.7V
f
CK
(4)
10 pF < C
0.1V
> max(16f
3 mA sink current
f
f
SCL
SCL
f
f
f
f
SCL
SCL
SCL
SCL
CC
Condition
≤ 100 kHz
> 100 kHz
< V
≤ 100 kHz
> 100 kHz
≤ 100 kHz
> 100 kHz
b
CC
Safe Operating Area
< 400 pF
SCL
i
< 0.9V
, ATmega16U4/ATmega32U4
, 250kHz)
(6)
(7)
CC
(3)
(5)
4.5V
20 + 0.1C
20 + 0.1C
V
----------------------------
V
----------------------------
0.05 V
CC
CC
0.7 V
3mA
3mA
-0.5
Min
-10
4.0
0.6
4.7
1.3
–
–
0
0
–
0
ATmega16/32U4
0,4V
0,4V
CC
CC
b
b
(2)
(3)(2)
(3)(2)
5.5V
V
0.3 V
1000ns
------------------ -
CC
300ns
--------------- -
50
Max
300
250
400
0.4
C
10
10
C
–
–
–
–
–
+ 0.5
b
(2)
b
CC
Units
kHz
µA
pF
ns
ns
ns
µs
µs
µs
µs
Ω
Ω
V
V
V
V
381