Datasheet

352
8025M–AVR–6/11
ATmega48P/88P/168P
It is possible to calculate the typical current consumption based on the numbers from Table 30-4
on page 351 for other V
CC
and frequency settings than listed in Table 30-3 on page 351.
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 30-4 on page 351, third column, we see that we need
to add 17.0% for the TIMER1, 17.6% for the ADC, and 17.5% for the SPI module. Reading from
Figure 30-52 on page 349, we find that the idle current consumption is ~0.055 mA at V
CC
= 2.0V
and F = 1MHz. The total current consumption in idle mode with TIMER1, ADC, and SPI enabled,
gives:
30.2.4 Power-down Supply Current
Figure 30-57. Power-Down Supply Current vs. V
CC
(Watchdog Timer Disabled).
PRTIM1 2.8% 17.0%
PRTIM0 0.8% 4.6%
PRSPI 3.0% 17.5%
PRADC 2.9% 17.6%
Table 30-4. Additional Current Consumption (percentage) in Active and Idle mode
PRR bit
Additional Current consumption
compared to Active with external
clock (see Figure 30-47 on page
346 and Figure 30-48 on page
347)
Additional Current consumption
compared to Idle with external
clock (see Figure 30-52 on page
349 and Figure 30-53 on page
349)
ICCtotal 0.055 mA (1 + 0.170 + 0.176 + 0.175)⋅ 0.084 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
(uA)