Example, Power-down supply current – Rainbow Electronics ATmega3290P_V User Manual
Page 326
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ATmega329/3290/649/6490
2552H–AVR–11/06
It is possible to calculate the typical current consumption based on the numbers from
Table 145 for other V
CC
and frequency settings than listed in Table 144.
Example
Calculate the expected current consumption in idle mode with USART0, TIMER1, and
SPI enabled at V
CC
= 3.0V and F = 1MHz. Table 145 shows that we need to add 8.5%
for the USART0, 9% for the SPI, and 4.8% for the TIMER1 module. From Figure 147,
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 152. Power-down Supply Current vs. V
CC
(Watchdog Timer Disabled)
Figure 153. Power-down Supply Current vs. V
CC
(Watchdog Timer Enabled)
I
CC
total
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)