ATmega644P Atmel Corporation, ATmega644P Datasheet - Page 344

• 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

Example
26.1.4
8011O–AVR–07/10
Power-down Supply Current
Table 26-2.
It is possible to calculate the typical current consumption based on the numbers from
on page 344
Calculate the expected current consumption in idle mode with TIMER1, ADC, and SPI enabled
at V
to add 10.5% for the TIMER1, 16.8% for the ADC, and 12.9% for the SPI module. Reading from
Figure 26-6 on page
and F = 1 MHz. The total current consumption in idle mode with TIMER1, ADC, and SPI
enabled, gives:
Figure 26-11. Power-down Supply Current vs. V
PRR bit
PRUSART1
PRUSART0
PRTWI
PRTIM2
PRTIM1
PRTIM0
PRADC
PRSPI
CC
= 2.0V and F = 1 MHz. From
1.8
1.6
1.4
1.2
0.8
0.6
0.4
0.2
2
1
0
for other V
1.5
Additional Current Consumption (percentage) in Active and Idle mode
Additional Current consumption
compared to Active with external
clock (see
338
1.8%
2.4%
5.4%
4.6%
2.7%
1.6%
4.5%
3.3%
I
341, we find that the idle current consumption is ~0.115 mA at V
CC
and
2
CC
total
Figure 26-2 on page
and frequency settings than listed in
≈
Figure 26-1 on page
0.115 mA (1 + 0.105 + 0.168 + 0.129)
2.5
Table 26-2 on page
⋅
3
V
339)
CC
3.5
(V)
CC
ATmega164P/324P/644P
(Watchdog Timer Disabled).
Additional Current consumption
compared to Idle with external
clock (see
341
6.9%
9.1%
21.2%
17.4%
10.5%
6.0%
16.8%
12.9%
4
344, third column, we see that we need
and
Figure 26-7 on page
4.5
Table 26-1 on page
Figure 26-6 on page
≈
0.161 mA
5
5.5
341)
-40°C
85°C
25°C
343.
Table 26-2
CC
= 2.0V
344