
318
8023F–AVR–07/09
ATmega325P/3250P
Figure 27-8. Idle Supply Current vs. V
CC (Internal RC Oscillator, 1 MHz)
27.3
Supply Current of I/O modules
The tables and formulas below can be used to calculate the additional current consumption for
the different I/O modules in Active and Idle mode. The enabling or disabling of the I/O modules
IDLE SUPPLY CURRENT vs. VCC
INTERNAL RC OSCILLATOR, 1 MHz
85 °C
25 °C
-40 °C
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.522.533.544.555.5
VCC (V)
I CC
(mA)
Table 27-1.
Additional Current Consumption for the different I/O modules (absolute values)
PRR bit
Typical numbers
VCC = 2V, F = 1MHz
VCC = 3V, F = 4MHz
VCC = 5V, F = 8MHz
PRADC
19 A
102 A
395 A
PRUSART0
9 A
57 A
240 A
PRSPI
11 A
68 A
276 A
PRTIM1
5 A
30 A
116 A
Table 27-2.
Additional Current Consumption (percentage) in Active and Idle mode
PRR bit
Additional Current consumption
compared to Active with external
clock
Additional Current consumption
compared to Idle with external clock
PRADC
4.2%
9.0%
PRUSART0
2.3%
4.9%
PRSPI
2.7%
5.9%
PRTIM1
1.2%
2.6%