Datasheet

328
8025M–AVR–6/11
ATmega48P/88P/168P
It is possible to calculate the typical current consumption based on the numbers from Table 30-2
on page 328 for other V
CC
and frequency settings than listed in Table 30-1 on page 327.
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 30-2 on page 328, third column, we see that we need
to add 16.1% for the TIMER1, 15.5% for the ADC, and 13.4% for the SPI module. Reading from
Figure 30-6 on page 325, 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:
30.1.4 Power-down Supply Current
Figure 30-11. Power-Down Supply Current vs. V
CC
(Watchdog Timer Disabled).
Table 30-2. Additional Current Consumption (percentage) in Active and Idle mode
PRR bit
Additional Current consumption
compared to Active with external
clock (see Figure 30-1 on page
322 and Figure 30-2 on page 323)
Additional Current consumption
compared to Idle with external
clock (see Figure 30-6 on page
325 and Figure 30-7 on page 325)
PRUSART0 1.9% 9.1%
PRTWI 3.1% 14.8%
PRTIM2 3.5% 16.6%
PRTIM1 3.4% 16.1%
PRTIM0 0.8% 3.9%
PRSPI 2.8% 13.4%
PRADC 3.3% 15.5%
ICCtotal 0.055 mA (1 + 0.161 + 0.155 + 0.134)⋅ 0.080 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
1.5 2 2.5 3 3.5 4 4.5 5 5.5
V
CC
(V)
I
CC
(uA)