Atmel ATmega48A Manual page 488

30.7.3.1 Example
8271D–AVR–05/11
ATmega48A/PA/88A/PA/168A/PA/328/P
Table 30-14. ATmega328: Additional Current Consumption (percentage) in Active and Idle
mode
Additional Current consumption
compared to Active with external
clock (see
507 and
PRR bit 508)
PRUSART0
PRTWI
PRTIM2
PRTIM1
PRTIM0
PRSPI
PRADC
It is possible to calculate the typical current consumption based on the numbers from
13 for other V and frequency settings than listed in
CC
Calculate the expected current consumption in idle mode with TIMER1, ADC, and SPI enabled
at V = 2.0V and F = 1MHz. From
CC
14.5% for the TIMER1, 22.1% for the ADC, and 15.7% for the SPI module. Reading from
30-336 on page 510, we find that the idle current consumption is ~0.055 mA at V
= 1MHz. The total current consumption in idle mode with TIMER1, ADC, and SPI enabled, gives:
≈ ⋅
I 0.045 mA (1 + 0.145 + 0.221 + 0.157)
CC
total
Figure 30-330 on page
Figure 30-331 on page
1.4%
3.0%
3.3%
2.7%
0.9%
2.9%
4.1%
Table 30-14, third column, we see that we need to add
≈
0.069 mA
Additional Current consumption
compared to Idle with external
clock (see Figure 30-335 on page
510 and Figure 30-336 on page
510)
7.8%
16.6%
17.8%
14.5%
4.8%
15.7%
22.1%
Table 30-14.
Table 30-
Figure
= 2.0V and F
CC
488