Datasheet

461
8284D–AVR–6/11
ATmega169A/PA/329A/PA/3290A/PA/649A/P/6490A/P
are controlled by the Power Reduction Register. See ”PRR – Power Reduction Register” on
page 46 for details.
It is possible to calculate the typical current consumption based on the numbers from Table 30-2
for other V
CC
and frequency settings than listed in Table 30-1.
30.4.3.1 Example 1
Calculate the expected current consumption in idle mode with USART0, TIMER1, and SPI
enabled at V
CC
= 3.0V and F = 1MHz. From Table 30-2, second column, we see that we need to
add 13.1% for the USART0, 13.0% for the SPI, and 13.2% for the TIMER1 module. Reading
from Figure 30-6, we find that the idle current consumption is ~0.09 mA at V
CC
= 3.0V and F =
1MHz. The total current consumption in idle mode with USART0, TIMER1, and SPI enabled,
gives:
Table 30-7. ATmega329PA: Additional Current Consumption for the different I/O modules
(absolute values)
PRR bit Typical numbers
V
CC
= 2V, F = 1MHz V
CC
= 3V, F = 4MHz V
CC
= 5V, F = 8MHz
PRADC 7µA 44µA 195µA
PRUSART0 6.9µA 43.5µA 210µA
PRSPI 6.6µA 47µA 205µA
PRTIM1 7µA 47µA 206µA
PRLCD 7.3µA 48µA 215µA
Table 30-8. ATmega329PA: Additional Current Consumption (percentage) in Active and Idle
mode
PRR bit
Additional Current consumption
compared to Active with external clock
(see Figure 30-1 and Figure 30-2)
Additional Current consumption
compared to Idle with external clock
(see Figure 30-6 and Figure 30-7)
PRADC 3.2% 12.7%
PRUSART0 3.4% 13.1%
PRSPI 3.3% 13.0%
PRTIM1 3.4% 13.2%
PRLCD 3.5% 13.7%
ICCtotal 0.09mA 1 0.131 0.13 0.132+++()• 0.13mA≈≈