Datasheet

347
8011Q–AVR–02/2013
ATmega164P/324P/644P
It is possible to calculate the typical current consumption based on the numbers from Table 27-2
on page 347 for other V
CC
and frequency settings than listed in Table 27-1 on page 346.
Example Calculate the expected current consumption in idle mode with TIMER1, ADC, and SPI enabled
at V
CC
= 2.0V and F = 1 MHz. From Table 27-2 on page 347, third column, we see that we need
to add 10.5% for the TIMER1, 16.8% for the ADC, and 12.9% for the SPI module. Reading from
Figure 27-6 on page 344, we find that the idle current consumption is ~0.115 mA at V
CC
= 2.0V
and F = 1 MHz. The total current consumption in idle mode with TIMER1, ADC, and SPI
enabled, gives:
27.1.4 Power-down Supply Current
Figure 27-11. Power-down Supply Current vs. V
CC
(Watchdog Timer Disabled).
Table 27-2. Additional Current Consumption (percentage) in Active and Idle mode
PRR bit
Additional Current consumption
compared to Active with external
clock (see Figure 27-1 on page
341 and Figure 27-2 on page 342)
Additional Current consumption
compared to Idle with external
clock (see Figure 27-6 on page
344 and Figure 27-7 on page 344)
PRUSART1 1.8% 6.9%
PRUSART0 2.4% 9.1%
PRTWI 5.4% 21.2%
PRTIM2 4.6% 17.4%
PRTIM1 2.7% 10.5%
PRTIM0 1.6% 6.0%
PRADC 4.5% 16.8%
PRSPI 3.3% 12.9%
ICCtotal 0.115 mA (1 + 0.105 + 0.168 + 0.129) 0.161 mA
85°C
25°C
-40°C
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
1.5 2 2.5 3 3.5 4 4.5 5 5.5
V
CC
(V)
I
CC
(µA )