Datasheet

376
8025M–AVR–6/11
ATmega48P/88P/168P
It is possible to calculate the typical current consumption based on the numbers from Table 30-6
on page 376 for other V
CC
and frequency settings than listed in Table 30-5 on page 375.
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 30-6 on page 376, third column, we see that we need
to add 15.2% for the TIMER1, 14.5% for the ADC, and 15.8% for the SPI module. Reading from
Figure 30-98 on page 373, 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:
30.3.4 Power-down Supply Current
Figure 30-103.Power-Down Supply Current vs. V
CC
(Watchdog Timer Disabled).
Table 30-6. Additional Current Consumption (percentage) in Active and Idle mode
PRR bit
Additional Current consumption
compared to Active with external
clock (see Figure 30-93 on page
370 and Figure 30-94 on page
371)
Additional Current consumption
compared to Idle with external
clock (see Figure 30-98 on page
373 and Figure 30-99 on page
373)
PRUSART0 1.9% 8.5%
PRTWI 3.4% 15.6%
PRTIM2 3.6% 16.5%
PRTIM1 3.4% 15.2%
PRTIM0 0.8% 3.7%
PRSPI 3.5% 15.8%
PRADC 3.2% 14.5%
ICCtotal 0.065 mA (1 + 0.152 + 0.145 + 0.158)⋅ 0.095 mA≈≈
85 °C
25 °C
-40 °C
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.5 2 2.5 3 3.5 4 4.5 5 5.5
V
CC
(V)
I
CC
(uA)