Datasheet

343
8018P–AVR–08/10
ATmega169P
Figure 29-10. Idle Supply Current vs. V
CC
(32 kHz Watch Crystal)
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 ”Power Reduction Register” on page 42 for
details.
25°C
0
2
4
6
8
10
12
14
1.5 2 2.5 33.5 4 4.5 5 5.5
V
CC
(V)
I
CC
(µ A)
Table 29-1. Additional Current Consumption for the different I/O modules (absolute values)
PRR bit Typical numbers
V
CC
= 2V, F = 1 MHz V
CC
= 3V, F = 4 MHz V
CC
= 5V, F = 8 MHz
PRADC 18 µA 116 µA 495 µA
PRUSART0 11 µA 79 µA 313 µA
PRSPI 10 µA 72 µA 283 µA
PRTIM1 19 µA 117 µA 481 µA
PRLCD 4 µA 32 µA 105 µA
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 on page 338 and
Figure 29-2 on page 339)
Additional Current consumption
compared to Idle with external clock
(see Figure 29-6 on page 341 and
Figure 29-7 on page 341)
PRADC 5.6% 18.7%
PRUSART0 3.7% 12.4%