Datasheet

Figure 30-10. Idle Supply Current vs. V
CC
(Internal RC Oscillator, 128 kHz)
85 °C
25 °C
-40 °C
0
0.02
0.04
0.06
0.08
0.1
0.12
1.5 2 2.5 3 3.5 4 4.5 5 5.5
V
CC
(V)
I
CC
(mA)
30.3. 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” for details.
Table 30-1. Additional Current Consumption for the different I/O modules (absolute values)
PRR bit Typical numbers (μA)
V
CC
= 2V, F = 1MHz V
CC
= 3V, F = 4MHz V
CC
= 5V, F = 8MHz
PRUSART1 5.9 37.3 149.0
PRUSART0 6.7 40.0 157.1
PRTWI 9.5 58.9 239.5
PRTIM2 12.0 74.3 297.6
PRTIM1 6.6 41.4 170.3
PRTIM0 3.1 19.5 78.6
PRADC 16.2 75.4 301.4
PRSPI 9.3 56.6 226.3
Table 30-2. Additional Current Consumption (percentage) in Active and Idle mode
PRR bit Additional Current consumption
compared to Active with external clock
(See Figure 30-1 and Figure 30-2)
Additional Current consumption
compared to Idle with external clock (See
Figure 30-6 and Figure 30-7)
PRUSART1 1.6% 8.1%
PRUSART0 1.8% 8.8%
PRTWI 2.6% 12.9%
Atmel ATmega644A [DATASHEET]
Atmel-42716C-ATmega644A_Datasheet_Complete-10/2016
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