ATmega644A Atmel Corporation, ATmega644A Datasheet - Page 330
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ATmega644A
Manufacturer Part Number
ATmega644A
Description
Manufacturer
Atmel Corporation
Specifications of ATmega644A
Flash (kbytes)
64 Kbytes
Pin Count
44
Max. Operating Frequency
20 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
32
Ext Interrupts
32
Usb Speed
No
Usb Interface
No
Spi
3
Twi (i2c)
1
Uart
2
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
8
Adc Resolution (bits)
10
Adc Speed (ksps)
15
Analog Comparators
1
Resistive Touch Screen
No
Temp. Sensor
No
Crypto Engine
No
Sram (kbytes)
4
Eeprom (bytes)
2048
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
Temp. Range (deg C)
-40 to 85
I/o Supply Class
1.8 to 5.5
Operating Voltage (vcc)
1.8 to 5.5
Fpu
No
Mpu / Mmu
no / no
Timers
3
Output Compare Channels
6
Input Capture Channels
1
Pwm Channels
6
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATmega644A-AU
Manufacturer:
Atmel
Quantity:
135
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Table 28-1.
Notes:
8272C–AVR–06/11
Symbol
V
I
t
ACLK
ACID
ACIO
1. "Max" means the highest value where the pin is guaranteed to be read as low
2. "Min" means the lowest value where the pin is guaranteed to be read as high
3. Although each I/O port can sink more than the test conditions (20mA at VCC = 5V, 10mA at VCC = 3V) under steady state
4. Although each I/O port can source more than the test conditions (20mA at VCC = 5V, 10mA at VCC = 3V) under steady
conditions (non-transient), the following must be observed:
1.)The sum of all IOL, for ports PB0-PB7, XTAL2, PD0-PD7 should not exceed 100mA.
2.)The sum of all IOL, for ports PA0-PA3, PC0-PC7 should not exceed 100mA.
If IOL exceeds the test condition, VOL may exceed the related specification. Pins are not guaranteed to sink current greater
than the listed test condition.
state conditions (non-transient), the following must be observed:
1.)The sum of all IOH, for ports PB0-PB7, XTAL2, PD0-PD7 should not exceed 100mA.
2.)The sum of all IOH, for ports PA0-PA3, PC0-PC7 should not exceed 100mA.
If IOH exceeds the test condition, VOH may exceed the related specification. Pins are not guaranteed to source current
greater than the listed test condition.
Parameter
Analog Comparator
Input Offset Voltage
Analog Comparator
Input Leakage Current
Analog Comparator
Propagation Delay
T
A
= -40°C to 85°C, V
CC
V
V
V
Condition
V
V
V
= 1.8V to 5.5V (unless otherwise noted) (Continued)
CC
in
CC
in
CC
CC
ATmega164A/PA/324A/PA/644A/PA/1284/P
= V
= V
= 5V
= 5V
= 2.7V
= 4.0V
CC
CC
/2
/2
Min.
-50
Typ.
<10
750
500
Max.
40
50
Units
mV
nA
ns
330
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