Datasheet

312
2570N–AVR–05/11
ATmega325/3250/645/6450
29.3.0.1 Example
Calculate the expected current consumption in idle mode with USART0, TIMER1, and SPI
enabled at V
CC
= 3.0V and F = 1MHz. Table 29-2 shows that we need to add 8.5% for the
USART0, 9% for the SPI, and 4.8% for the TIMER1 module. From Figure 29-6, we find that the
idle current consumption is ~0.16mA at V
CC
= 3.0V and F = 1MHz. The total current consump-
tion 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)
Figure 29-12. Power-down Supply Current vs. V
CC
(Watchdog Timer Enabled)
ICCtotal 0.16mA 10.0850.090.048+++()• 0.20mA≈≈
85 °C
25 °C
-40 °C
0
0.5
1
1.5
2
2.5
3
3.5
4
1.5 2 2.5 3 3.5 4 4.5 5 5.5
V
CC
(V)
I
CC
(uA)
85 °C
25 °C
-40 °C
0
2
4
6
8
10
12
14
16
18
20
1.5 2 2.5 3 3.5 4 4.5 5 5.5
V
CC
(V)
I
CC
(uA)