ATMEGA644PA-AUR Atmel, ATMEGA644PA-AUR Datasheet - Page 400
![IC MCU AVR 64K FLASH 44TQFP](/photos/6/70/67042/313-44-tqfp_sml.jpg)
ATMEGA644PA-AUR
Manufacturer Part Number
ATMEGA644PA-AUR
Description
IC MCU AVR 64K FLASH 44TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA644PA-AUR
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-TQFP, 44-VQFP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
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Manufacturer
Quantity
Price
Company:
Part Number:
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Manufacturer:
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Quantity:
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28.3.3
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 28-5.
Table 28-6.
It is possible to calculate the typical current consumption based on the numbers from
on page 426
Calculate the expected current consumption in idle mode with TIMER1, ADC, and SPI enabled
at V
to add 6.0% for the TIMER1, 14.8% for the ADC, and 10.3% for the SPI module. Reading from
Figure 28-153 on page
2.0V 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
PRTIM2
PRTIM1
PRTIM0
PRADC
PRSPI
PRR bit
PRUSART1
PRUSART0
PRTWI
PRTIM2
PRTIM1
PRTIM0
PRADC
PRSPI
CC
= 2.0V and F = 1MHz. From
for details.
for other V
Additional Current Consumption for the different I/O modules (absolute values)
Additional Current Consumption (percentage) in Active and Idle mode
Typical numbers in
Additional Current consumption
compared to Active with external
clock (see
421
421)
V
CC
I
CC
and
= 2V, F = 1 MHz
CC
total
423, we find that the idle current consumption is ~0.078 mA at V
11.8 µA
3.1 µA
3.0 µA
6.4 µA
5.6 µA
3.6 µA
1.7 µA
5.3 µA
Figure 28-149 on page
and frequency settings than listed in
≈
Figure 28-148 on page
0.078 mA (1+ 0.060 + 0.148 + 0.103)
1.4%
1.4%
3.0%
2.5%
1.6%
0.7%
4.2%
2.7%
Table 28-8 on page
⋅
V
CC
= 3V, F = 4 MHz
21.5 µA
21.0 µA
45.7 µA
37.7 µA
24.8 µA
10.4 µA
59.2 µA
40.1 µA
Additional Current consumption
compared to Idle with external
clock (see
423
424)
”PRR – Power Reduction Register” on
426, third column, we see that we need
and
Figure 28-154 on page
Table 28-7 on page
≈
Figure 28-153 on page
0.102 mA
V
11.3%
14.8%
10.3%
5.3%
5.2%
9.1%
6.0%
2.5%
CC
= 5V, F = 8 MHz
100.0 µA
214.5 µA
165.8 µA
107.0 µA
257.0 µA
206.8 µA
98.2 µA
43.2 µA
426.
Table 28-8
CC
400
=
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