ATmega32U4 Atmel Corporation, ATmega32U4 Datasheet - Page 380
ATmega32U4
Manufacturer Part Number
ATmega32U4
Description
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
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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
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