ATMEGA644A-MUR Atmel, ATMEGA644A-MUR Datasheet - Page 335
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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27.4
Table 27-12. Reset, Brown-out and Internal Voltage Reference Characteristics
Notes:
Table 27-13. BODLEVEL Fuse Coding
Note:
27.5
Table 27-14. Asynchronous External Interrupt Characteristics
8272A–AVR–01/10
Symbol
Symbol
V
t
V
V
INT
t
t
V
t
I
RST
BOD
HYST
POT
RST
BG
BG
BG
System and Reset Characteristics
1. The Power-on Reset will not work unless the supply voltage has been below V
1. V
External Interrupts Characteristics
tested down to V
a voltage where correct operation of the microcontroller is no longer guaranteed. The test is performed using
BODLEVEL = 101 and BODLEVEL = 110.
BODLEVEL 2:0 Fuses
BOT
Parameter
Minimum pulse width for asynchronous external interrupt
Parameter
Power-on Reset Threshold Voltage (rising)
Power-on Reset Threshold Voltage (falling)
Minimum pulse width on RESET Pin
Brown-out Detector Hysteresis
Min Pulse Width on Brown-out Reset
Bandgap reference voltage
Bandgap reference start-up time
Bandgap reference current consumption
RESET Pin Threshold Voltage
may be below nominal minimum operating voltage for some devices. For devices where this is the case, the device is
111
110
101
100
011
010
001
000
CC
164A/164PA/324A/324PA/644A/644PA/1284/1284P
= V
BOT
during the production test. This guarantees that a Brown-Out Reset will occur before V
(1)
Min V
(1)
1.7
2.5
4.1
BOT
V
V
V
CC
CC
CC
= 2.7V, T
= 2.7V, T
= 2.7V, T
Condition
Typ V
A
A
A
= 25°C
= 25°C
= 25°C
1.8
2.7
4.3
BOD Disabled
BOT
Condition
Reserved
POT
0.2V
(falling).
Min
1.1
0.6
1.0
CC
Min
Max V
Typ
1.4
1.3
1.1
50
40
10
2.0
2.9
4.5
2
BOT
Typ
50
0.9V
Max
1.6
1.6
2.5
1.2
70
Max
CC
CC
Units
Units
drops to
V
mV
Units
µA
µs
µs
µs
V
V
V
V
ns
335
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