ATmega644P Atmel Corporation, ATmega644P Datasheet - Page 393

• Manufacturer Part Number: ATmega644P
• Manufacturer: Atmel Corporation

Specifications of ATmega644P

• Flash (kbytes): 64 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 20 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 32
• Ext Interrupts: 32
• Usb Speed: No
• Usb Interface: No
• Spi: 3
• Twi (i2c): 1
• Uart: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 4
• Eeprom (bytes): 2048
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 6
• Input Capture Channels: 1
• Pwm Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

26.3.3
Example
8011O–AVR–07/10
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 48
Table 26-5.
Table 26-6.
It is possible to calculate the typical current consumption based on the numbers from
on page 393
Calculate the expected current consumption in idle mode with TIMER1, ADC, and SPI enabled
at V
to add 8.9% for the TIMER1, 17.2% for the ADC, and 12.3% for the SPI module. Reading from
Figure 26-100 on page
and F = 1 MHz. The total current consumption in idle mode with TIMER1, ADC, and SPI
enabled, gives:
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 = 1 MHz. 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
Additional Current consumption
compared to Active with external
clock (see
388
388)
V
CC
I
and
CC
= 2V, F = 1 MHz
CC
390, we find that the idle current consumption is ~0.1 mA at V
total
11.5 µA
14.5 µA
5.8 µA
6.5 µA
9.4 µA
5.9 µA
3.3 µA
8.9 µA
Figure 26-96 on page
and frequency settings than listed in
≈
Figure 26-95 on page
0.1 mA (1 + 0.089 + 0.172 + 0.123)
1.6%
1.8%
2.6%
3.3%
1.8%
0.9%
3.5%
2.5%
Table 26-6 on page
⋅
V
CC
= 3V, F = 4 MHz
37.7 µA
40.5 µA
59.7 µA
75.0 µA
41.5 µA
19.7 µA
73.8 µA
56.7 µA
ATmega164P/324P/644P
Additional Current consumption
compared to Idle with external
clock (see
390
391)
”PRR – Power Reduction Register” on
393, third column, we see that we need
and
Figure 26-101 on page
≈
Table 26-5 on page
Figure 26-100 on page
0.138 mA
V
13.0%
16.1%
17.2%
12.3%
8.1%
8.7%
8.9%
4.0%
CC
= 5V, F = 8 MHz
152.0 µA
154.8 µA
239.3 µA
297.0 µA
171.8 µA
302.7 µA
226.0 µA
78.3 µA
393.
Table 26-6
CC
= 2.0V
393