Datasheet

344
8018P–AVR–08/10
ATmega169P
It is possible to calculate the typical current consumption based on the numbers from Table 29-2
on page 343 for other V
CC
and frequency settings than listed in Table 29-1 on page 343.
29.3.0.1 Example 1
Calculate the expected current consumption in idle mode with USART0, TIMER1, and SPI
enabled at V
CC
= 3.0V and F = 1 MHz. From Table 29-2 on page 343, second column, we see
that we need to add 12.4% for the USART0, 10.8% for the SPI, and 18.6% for the TIMER1 mod-
ule. Reading from Figure 29-6 on page 341, we find that the idle current consumption is ~0.18
mA at V
CC
= 3.0V and F = 1 MHz. The total current consumption in idle mode with USART0,
TIMER1, and SPI enabled, gives:
29.4 Power-down Supply Current
Figure 29-11. Power-down Supply Current vs. V
CC
(Watchdog Timer Disabled)
PRSPI 3.2% 10.8%
PRTIM1 5.6% 18.6%
PRLCD 12.5% 41.7%
Table 29-2. Additional Current Consumption (percentage) in Active and Idle mode
PRR bit
Additional Current consumption
compared to Active with external clock
(see Figure 29-1 on page 338 and
Figure 29-2 on page 339)
Additional Current consumption
compared to Idle with external clock
(see Figure 29-6 on page 341 and
Figure 29-7 on page 341)
ICCtotal 0.18mA 1 0.124 0.108 0.186+++()• 0.26mA≈≈
85°C
-40°C
25°C
0.00
0.20
0.40
0.60
0.80
1.00
1.20
1.40
1.60
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
V
CC
(V)
I
CC
(µ A)