Datasheet

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
are controlled by the Power Reduction Register. See ”PRR – Power Reduction Register” on
page 44 for details.
IDLE SUPPLY CURRENT vs. V
CC
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
V
CC
(V)
I
CC
(mA)
Table 27-1. Additional Current Consumption for the different I/O modules (absolute values)
PRR bit Typical numbers
V
CC
= 2V, F = 1MHz V
CC
= 3V, F = 4MHz V
CC
= 5V, F = 8MHz
PRADC 19 µA 102 µA 395 µA
PRUSART0 9 µA 57 µA 240 µA
PRSPI 11 µA 68 µA 276 µA
PRTIM1 5 µA 30 µA 116 µA
Table 27-2. Additional Current Consumption (percentage) in Active and Idle mode
PRR bit
Additional Current consumption
compared to Active with external
clock
(see Figure 27-1 and Figure 27-2)
Additional Current consumption
compared to Idle with external clock
(see Figure 27-5 and Figure 27-6)
PRADC 4.2% 9.0%
PRUSART0 2.3% 4.9%
PRSPI 2.7% 5.9%
PRTIM1 1.2% 2.6%