ATmega644P Atmel Corporation, ATmega644P Datasheet - Page 337
ATmega644P
Manufacturer Part Number
ATmega644P
Description
Manufacturer
Atmel Corporation
Specifications of ATmega644P
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
Yes
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
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Table 25-12. ADC Characteristics, Differential Channels (Continued)
Note:
8011O–AVR–07/10
Symbol
AVCC
R
V
V
V
V
REF
INT1
INT2
REF
IN
1. Values are guidelines only.
Parameter
Gain Error
Offset Error
Conversion Time
Clock Frequency
Analog Supply Voltage
Reference Voltage
Input Differential Voltage
ADC Conversion Output
Input Bandwidth
Internal Voltage Reference
Internal Voltage Reference
Reference Input Resistance
Condition
Gain = 1×
V
ADC clock = 200 kHz
Gain = 10×
V
ADC clock = 200 kHz
Gain = 200×
V
ADC clock = 200 kHz
Gain = 1×
V
ADC clock = 200 kHz
Gain = 10×
V
ADC clock = 200 kHz
Gain = 200×
V
ADC clock = 200 kHz
1.1V
2.56V
CC
CC
CC
CC
CC
CC
= 5V, V
= 5V, V
= 5V, V
= 5V, V
= 5V, V
= 5V, V
REF
REF
REF
REF
REF
REF
= 4V
= 4V
= 4V
= 4V
= 4V
= 4V
ATmega164P/324P/644P
Min
V
-511
2.33
0.3
2.0
1.0
13
50
CC
0
(1)
-
Typ
19.5
19.5
1.25
2.56
6.5
2.5
1.1
32
1
4
(1)
Max
AVCC -
AVCC
V
1000
2.79
260
511
0.3
0.5
1.2
CC
(1)
+
Units
LSB
LSB
kHz
kHz
kΩ
µs
V
V
337
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