ATMEGA644A-MU Atmel, ATMEGA644A-MU Datasheet - Page 361
![IC MCU AVR 64K FLASH 44VQFN](/photos/12/13/121316/313-44-qfn_sml.jpg)
ATMEGA644A-MU
Manufacturer Part Number
ATMEGA644A-MU
Description
IC MCU AVR 64K FLASH 44VQFN
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA644A-MU
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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28.1.11
8272A–AVR–01/10
Internal Oscillator Speed
Figure 28-35. ATmega164A: Bandgap Voltage vs. Temperature
Figure 28-36. ATmega164A: Watchdog Oscillator Frequency vs. Temperature
164A/164PA/324A/324PA/644A/644PA/1284/1284P
1.087
1.085
1.083
1.081
1.079
1.077
1.075
1.073
1.071
1.069
1.067
134
132
130
128
126
124
122
120
-40
-50
-40
-30
-30
-20
-20
-10
-10
0
0
10
Temperature (°C)
Temperature (°C)
10
20
20
30
30
40
40
50
50
60
60
70
70
80
80
90
90
1.8V
3.6V
2.7V
4.5V
5.5V
2.1 V
2.7 V
3.3 V
4.0 V
5.5 V
361
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