Figure 28-10. Idle Supply Current vs. VCC (32 kHz Watch Crystal)
IDLE SUPPLY CURRENT vs. VCC
32 kHz WATCH CRYSTAL
14
25 ˚C
12
10
8
6
4
2
0
1.5
2
2.5
3
3.5
4
4.5
5
5.5
VCC (V)
28.3 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 ”Power Reduction Register” on page 41 for
details.
Table 28-1. Additional Current Consumption for the different I/O modules (absolute values)
PRR bit
Typical numbers
VCC = 2V, F = 1MHz
18 µA
VCC = 3V, F = 4MHz
116 µA
VCC = 5V, F = 8MHz
495 µA
PRADC
PRUSART0
PRSPI
11µA
79 µA
72 µA
117 µA
32 µA
313 µA
283 µA
481 µA
105 µA
10 µA
PRTIM1
PRLCD
19 µA
4 µA
Table 28-2. Additional Current Consumption (percentage) in Active and Idle mode
Additional Current consumption
compared to Active with external clock
(see Figure 28-1 and Figure 28-2)
Additional Current consumption
compared to Idle with external clock
(see Figure 28-6 and Figure 28-7)
PRR bit
PRADC
5.6ꢀ
3.7ꢀ
18.7ꢀ
12.4ꢀ
PRUSART0
340
ATmega169P
8018A–AVR–03/06
ATMEL [ ATMEL ]
