Datasheet

345
8011K–AVR–09/08
ATmega164P/324P/644P
It is possible to calculate the typical current consumption based on the numbers from Table 28-2
on page 345 for other V
CC
and frequency settings than listed in Table 28-1 on page 344.
Example Calculate the expected current consumption in idle mode with TIMER1, ADC, and SPI enabled
at V
CC
= 2.0V and F = 1MHz. From Table 28-2 on page 345, 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 28-6 on page 342, we find that the idle current consumption is ~0.115 mA at V
CC
=
2.0V and F = 1MHz. The total current consumption in idle mode with TIMER1, ADC, and SPI
enabled, gives:
28.1.4 Power-down Supply Current
Figure 28-11. Power-down Supply Current vs. V
CC
(Watchdog Timer Disabled).
Table 28-2. Additional Current Consumption (percentage) in Active and Idle mode
PRR bit
Additional Current consumption
compared to Active with external
clock (see Figure 28-1 on page
339 and Figure 28-2 on page 340)
Additional Current consumption
compared to Idle with external
clock (see Figure 28-6 on page
342 and Figure 28-7 on page 342)
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≈≈
POWER-DOWN SUPPLY CURRENT vs. V
CC
WATCHDOG TIMER DISABLED
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
(uA)