ATMEGA325V_14 Datasheet, PDF (311/362 Pages) ATMEL Corporation – High Performance, Low Power Atmel

ATmega325/3250/645/6450
Figure 29-10. Idle Supply Current vs. V_CC (32kHz External Oscillator)
35
30
25
20
15
10
5
0
1.5
2
2.5
3
3.5
4
4.5
5
V_CC (V)
85 °C
25 °C
-40 °C
5.5
29.3 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 40 for details.
Table 29-1. Additional Current Consumption for the different I/O modules (absolute values)
PRR bit
Typical numbers
PRADC
V_CC = 2V, F = 1MHz
17µA
V_CC = 3V, F = 4MHz
116µA
V_CC = 5V, F = 8MHz
562µA
PRUSART0
9µA
59µA
248µA
PRSPI
10µA
62µA
257µA
PRTIM1
5µA
33µA
135µA
Table 29-2. Additional Current Consumption (percentage) in Active and Idle mode
PRR bit
Additional Current consumption
compared to Active with external
clock
(see Figure 29-1 and Figure 29-2)
Additional Current consumption
compared to Idle with external
clock
(see Figure 29-6 and Figure 29-7)
PRADC
5.4%
16.8%
PRUSART0
2.7%
8.5%
PRSPI
2.9%
9.0%
PRTIM1
1.5%
4.8%
It is possible to calculate the typical current consumption based on the numbers from Table 29-2
for other V_CC and frequency settings than listed in Table 29-1.
2570N–AVR–05/11
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