ATMEGA644A-PU Atmel, ATMEGA644A-PU Datasheet - Page 341

• 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

Table 27-18. ADC Characteristics, Differential Channels (Continued)
Note:
8272A–AVR–01/10
Symbol
AVCC
R
V
V
V
V
REF
INT1
INT2
REF
IN
1. Values are guidelines only.
Parameter
Gain Error
Offset Error
Conversion Time
Clock Frequency
Analog Supply Voltage
Reference Voltage
Input Differential Voltage
ADC Conversion Output
Input Bandwidth
Internal Voltage Reference
Internal Voltage Reference
Reference Input Resistance
164A/164PA/324A/324PA/644A/644PA/1284/1284P
Condition
Gain = 1x
V
ADC clock = 200 kHz
Gain = 10x
V
ADC clock = 200 kHz
Gain = 200x
V
ADC clock = 200 kHz
Gain = 1x
V
ADC clock = 200 kHz
Gain = 10x
V
ADC clock = 200 kHz
Gain = 200x
V
ADC clock = 200 kHz
1.1V
2.56V
CC
CC
CC
CC
CC
CC
=5 V, V
=5 V, V
=5 V, V
=5 V, V
=5 V, V
=5 V, V
REF
REF
REF
REF
REF
REF
= 4V
= 4V
= 4V
= 4V
= 4V
= 4V
Min
V
-511
2.33
0.3
2.0
1.0
13
50
CC
0
(1)
-
Typ
2.56
1.5
1.1
18
19
32
-1
-1
1
4
(1)
Max
AVCC -
AVCC
V
1000
2.79
260
511
0.3
0.5
1.2
CC
(1)
+
Units
LSB
LSB
kHz
kHz
kΩ
µs
V
V
V
V
V
341