ATmega325PA Atmel Corporation, ATmega325PA Datasheet - Page 526

• Manufacturer Part Number: ATmega325PA
• Manufacturer: Atmel Corporation

29.7.3.1
8285D–AVR–06/11
Example 1
ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P
are controlled by the Power Reduction Register. See
page 45
Table 29-13. Additional Current Consumption for the different I/O modules (absolute values)
Table 29-14. Additional Current Consumption (percentage) in Active and Idle mode
It is possible to calculate the typical current consumption based on the numbers from
14
Calculate the expected current consumption in idle mode with USART0, TIMER1, and SPI
enabled at V
to add 49.8% for the USART0, 48.6% for the SPI, and 46.3% for the TIMER1 module. Reading
from
F = 1MHz. The total current consumption in idle mode with USART0, TIMER1, and SPI enabled,
gives:
I
CC
PRR bit
PRADC
PRUSART0
PRSPI
PRTIM1
PRR bit
PRADC
PRUSART0
PRSPI
PRTIM1
for other V
total
Figure
≈
0.13mA
for details.
29-371, we find that the idle current consumption is ~0.13 mA at V
CC
CC
•
= 3.0V and F = 1MHz. From
and frequency settings than listed in
(
Additional Current consumption
compared to Active with external clock
(see
1
Typical numbers
23.75µA
36.7µA
32.1µA
24.2µA
+
0.498
V
Figure 29-365
CC
= 2V, F = 1MHz
+
0.486
11.9%
13.2%
12.8%
12.1%
+
and
0.463
Figure
)
≈
0.45mA
Table
212.1µA
210.4µA
213µA
217µA
29-366)
V
CC
29-14, second column, we see that we need
= 3V, F = 4MHz
Table
”PRR – Power Reduction Register” on
Additional Current consumption
compared to Idle with external clock
(see
29-13.
Figure 29-370
938µA
939µA
940µA
940µA
45.7%
49.8%
48.6%
46.3%
V
CC
and
= 5V, F = 8MHz
Figure
CC
= 3.0V and
Table 29-
29-371)
526