ATMEGA644A-PU Atmel, ATMEGA644A-PU Datasheet - Page 530
![IC MCU AVR 64K FLASH 40PDIP](/photos/6/70/67049/453-40-dip_sml.jpg)
ATMEGA644A-PU
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
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28.8.3
Example
8272A–AVR–01/10
Supply Current of I/O modules
The tables and formulas below can be used to calculate the additional current consumption for
the different I/O modules in Active and Idle mode. The enabling or disabling of the I/O modules
are controlled by the Power Reduction Register. See
page 49
Table 28-15. Additional Current Consumption for the different I/O modules (absolute values)
Table 28-16. Additional Current Consumption (percentage) in Active and Idle mode
It is possible to calculate the typical current consumption based on the numbers from
12 on page 478
Calculate the expected current consumption in idle mode with TIMER1, ADC, and SPI enabled
at V
to add 8.0% for the TIMER1, 19.8% for the ADC, and 13.2% for the SPI module. Reading from
Figure 28-301 on page 502
and F = 1MHz. The total current consumption in idle mode with TIMER1, ADC, and SPI enabled,
gives:
164A/164PA/324A/324PA/644A/644PA/1284/1284P
PRR bit
PRUSART1
PRUSART0
PRTWI
PRTIM3
PRTIM2
PRTIM1
PRTIM0
PRADC
PRSPI
PRR bit
PRUSART1
PRUSART0
PRTWI
PRTIM3
PRTIM2
PRTIM1
PRTIM0
PRTADC
PRSPI
CC
= 2.0V and F = 1MHz. From
for details.
for other V
Typical numbers in
Additional Current consumption
compared to Active with external
clock (see
and
V
CC
Figure 28-296 on page
, we find that the idle current consumption is ~0.075 mA at V
= 2V, F = 1 MHz
CC
13.5 µA
3.0 µA
2.9 µA
7.5 µA
4.0 µA
6.0 µA
4.2 µA
1.7 µA
5.7 µA
and frequency settings than listed in
Figure 28-295 on page 499
Table 28-12 on page
0.9%
0.9%
2.3%
1.1%
1.8%
1.2%
0.5%
3.0%
2.0%
499)
V
CC
= 3V, F = 4 MHz
19.2 µA
19.2 µA
49.3 µA
24.7 µA
39.7 µA
26.4 µA
11.6 µA
54.7 µA
40.6 µA
”PRR – Power Reduction Register” on
478, third column, we see that we need
Additional Current consumption
compared to Idle with external clock
(see
Figure 28-301 on page
Figure 28-300 on page 501
Table 28-11 on page
V
15.4%
12.1%
19.8%
13.2%
6.0%
6.0%
7.5%
8.0%
3.6%
CC
= 5V, F = 8 MHz
230.3 µA
105.5 µA
176.3 µA
113.7 µA
212.2 µA
87.7 µA
88.5 µA
54.3 µA
273 µA
502)
Table 28-
CC
478.
= 2.0V
and
530
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