ATMEGA644A-PU Atmel, ATMEGA644A-PU Datasheet - Page 441

• Manufacturer Part Number: ATMEGA644A-PU
• Description: IC MCU AVR 64K FLASH 40PDIP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA644A-PU

• 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): 1.8 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)
• Processor Series: ATmega
• Core: AVR
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Interface Type: JTAG, TWI, SPI, USART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 32
• Number Of Timers: 3
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: Through Hole
• Minimum Operating Temperature: - 40 C
• Operating Temperature Range: - 40 C to + 85 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8272A–AVR–01/10
Figure 28-186.ATmega324PA: Calibrated 8 MHz RC Oscillator vs. Temperature
Figure 28-187.ATmega324PA: Calibrated 8 MHz RC Oscillator vs. OSCCAL Value
164A/164PA/324A/324PA/644A/644PA/1284/1284P
8.6
8.3
7.7
7.4
16
14
12
10
8
6
4
2
0
8
-40
0
16
32
-20
48
64
0
80
96
Temperature (°C)
112 128 144 160 176 192 208 224 240 256
20
OSCCAL (X1)
40
60
80
100
-40 °C
5.0 V
3.0 V
85 °C
25 °C
441