ATMEGA644A-MUR Atmel, ATMEGA644A-MUR Datasheet - Page 415
ATMEGA644A-MUR
Manufacturer Part Number
ATMEGA644A-MUR
Description
IC MCU AVR 64K FLASH 44VQFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA644A-MUR
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
44-VQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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8272A–AVR–01/10
Figure 28-137.ATmega324A: Calibrated 8 MHz RC Oscillator vs. Temperature
Figure 28-138.ATmega324A: 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
415
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