Datasheet

PRR bit Additional Current consumption
compared to Active with external
clock (see Figure 34-48 and Figure
34-49)
Additional Current consumption
compared to Idle with external clock
(see Figure 34-53 and Figure 34-54)
PRTIM1 2.1% 13.6%
PRTIM0 0.8% 5.2%
PRSPI 3.5% 21.5%
PRADC 4.2% 26.3%
It is possible to calculate the typical current consumption based on the numbers from the above table for
other V
CC
and frequency settings.
Related Links
14.11.3 PRR
34.2.3.1 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 Additional Current Consumption (percentage) in Active and Idle mode in
the previous section, third column, we see that we need to add 13.6% for the TIMER1, 26.3% for the
ADC, and 21.5% for the SPI module. Reading from Figure Idle Supply Current vs. Low Frequency
(0.1-1.0MHz), we find that the idle current consumption is ~0.027mA at V
CC
= 2.0V and F = 1MHz. The
total current consumption in idle mode with TIMER1, ADC, and SPI enabled, gives:
Icctotal  0.027mA(1+0.136+0.263+0.215)  0.043mA
Related Links
14.11.3 PRR
34.2.4 Power-Down Supply Current
Figure 34-58. ATmega88A: Power-Down Supply Current vs. V
CC
(Watchdog Timer Disabled)
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
1.5 2 2.5 3 3.5 4 4.5 5 5.5
V
CC
(V)
I
CC
(uA)
ATmega48A/88A/168A
Typical Characteristics (TA = -40°C to 85°C)
© 2018 Microchip Technology Inc.
Datasheet Complete
DS40002007A-page 424