Datasheet

304
ATmega325/3250/645/6450
2570K–AVR–04/07
Example Calculate the expected current consumption in idle mode with USART0, TIMER1, and
SPI enabled at V
CC
= 3.0V and F = 1MHz. Table 128 shows that we need to add 8.5%
for the USART0, 9% for the SPI, and 4.8% for the TIMER1 module. From Figure 139,
we find that the idle current consumption is ~0.16mA at V
CC
= 3.0V and F = 1MHz. The
total current consumption in idle mode with USART0, TIMER1, and SPI enabled, gives:
Power-down Supply Current Figure 144. Power-down Supply Current vs. V
CC
(Watchdog Timer Disabled)
Figure 145. Power-down Supply Current vs. V
CC
(Watchdog Timer Enabled)
ICCtotal 0,16mA 1 0,085 0,09 0,048+++()• 0,20mA≈≈
POWER-DOWN SUPPLY CURRENT vs. V
CC
WATCHDOG TIMER DISABLED
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)
POWER-DOWN SUPPLY CURRENT vs. V
CC
WATCHDOG TIMER ENABLED
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)