ATMEGA644P-20PQ Atmel, ATMEGA644P-20PQ Datasheet - Page 337

• Manufacturer Part Number: ATMEGA644P-20PQ
• Description: MCU AVR 64K FLASH 20MHZ 40-PDIP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA644P-20PQ

• 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): 2.7 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)
• For Use With: ATSTK600 - DEV KIT FOR AVR/AVR32
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 25-12. ADC Characteristics, Differential Channels (Continued)
Note:
8011O–AVR–07/10
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
Condition
Gain = 1×
V
ADC clock = 200 kHz
Gain = 10×
V
ADC clock = 200 kHz
Gain = 200×
V
ADC clock = 200 kHz
Gain = 1×
V
ADC clock = 200 kHz
Gain = 10×
V
ADC clock = 200 kHz
Gain = 200×
V
ADC clock = 200 kHz
1.1V
2.56V
CC
CC
CC
CC
CC
CC
= 5V, V
= 5V, V
= 5V, V
= 5V, V
= 5V, V
= 5V, V
REF
REF
REF
REF
REF
REF
= 4V
= 4V
= 4V
= 4V
= 4V
= 4V
ATmega164P/324P/644P
Min
V
-511
2.33
0.3
2.0
1.0
13
50
CC
0
(1)
-
Typ
19.5
19.5
1.25
2.56
6.5
2.5
1.1
32
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
337