ATMEGA644P-20PQ Atmel, ATMEGA644P-20PQ Datasheet - Page 3

• Manufacturer Part Number: ATMEGA644P-20PQ
• Description: MCU AVR 64K FLASH 20MHZ 40-PDIP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA644P-20PQ

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 64KB (32K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 4K x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• For Use With: ATSTK600 - DEV KIT FOR AVR/AVR32
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

1.2
8011O–AVR–07/10
Pinout - DRQFN
Figure 1-2.
Table 1-1.
A1
B1
A2
B2
A3
B3
A4
B4
A5
B5
A6
A1
A2
A3
A4
A5
A6
B1
B2
B3
B4
B5
RESET
XTAL2
XTAL1
DRQFN - Pinout ATmega164P
DRQFN - Pinout ATmega164P/324P
GND
VCC
PB5
PB6
PB7
PD0
PD1
PD2
Top view
A7
B6
A8
B7
A9
B8
A10
B9
A11
B10
A12
VCC
GND
PD3
PD4
PD5
PD6
PD7
PC0
PC1
PC2
PC3
B15
B14
B13
B12
B11
A18
A17
A16
A15
A14
A13
ATmega164P/324P/644P
A13
B11
A14
B12
A15
B13
A16
B14
A17
B15
A18
A18
A17
A16
A15
A14
A13
B15
B14
B13
B12
B11
Bottom view
AVCC
AREF
GND
PC4
PC5
PC6
PC7
PA7
PA6
PA5
PA4
A19
B16
A20
B17
A21
B18
A22
B19
A23
B20
A24
B1
B2
B3
B4
B5
GND
VCC
PB0
PB1
PB2
PB3
PB4
PA3
PA2
PA1
PA0
A1
A2
A3
A4
A5
A6
3