ATMEGA644P-A15MZ Atmel, ATMEGA644P-A15MZ Datasheet - Page 351

• Manufacturer Part Number: ATMEGA644P-A15MZ
• Description: MCU AVR 64KB FLASH 16MHZ 44QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA644P-A15MZ

• Package / Case: 44-VQFN Exposed Pad
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 125°C
• Speed: 16MHz
• Number Of I /o: 32
• Eeprom Size: 2K x 8
• Core Processor: AVR
• Program Memory Type: FLASH
• Ram Size: 4K x 8
• Program Memory Size: 64KB (64K x 8)
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Connectivity: I²C, SPI, UART/USART
• Core Size: 8-Bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7674F–AVR–09/09
Figure 27-25. Calibrated 8 MHz RC Oscillator Frequency vs. Temperature
Figure 27-26. Calibrated 8 MHz RC Oscillator Frequency vs. OSCCAL Value - Vcc = 5V
16
14
12
10
8.3
8.2
8.1
7.9
7.8
7.7
8
6
4
2
0
8
-40
0
16
-30
CALIBRATED 8 MHz RC OSCILLATOR FREQUENCY vs. TEMPERATURE
CALIBRATED 8MHz RC OSCILLATOR FREQUENCY vs. OSCCAL VALUE
-20
32
-10
48
64
0
10
80
20
96
30
112
OSCCAL (X1)
Temperature
40
128
50
144
ATmega164P/324P/644P
60
160
70
176
80
192
90
208
100
224
110
240
120
125
85
25
-45
351
5.5
5
4.5
3.3
3
2.7