Datasheet

349
ATmega169A/PA/329A/PA/649A/P/3290A/PA/6490A/P [DATASHEET]
8284E–AVR–02/2013
Figure 31-10. Atmel ATmega169A: Idle supply current vs. V
CC
(32kHz watch XTAL).
31.1.3 ATmega169A: 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 Reduc-
tion Register. See ”PRR – Power Reduction Register” on page 45 for details.
It is possible to calculate the typical current consumption based on the numbers from Table 31-2 for other V
CC
and
frequency settings than listed in Table 31-1.
85°C
25°C
-45°C
0
1
2
3
4
5
6
7
8
9
1.5 2 2.5 3 3.5 4 4.5 5 5.5
V
CC
[V]
I
CC
[µA]
Table 31-1. 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 7µA 44µA 195µA
PRUSART0 6.9µA 43.5µA 210µA
PRSPI 6.6µA 47µA 205µA
PRTIM1 7µA 47µA 206µA
PRLCD 7.3µA 48µA 215µA
Table 31-2. Additional current consumption (percentage) in Active and Idle mode.
PRR bit
Additional current consumption compared to
Active with external clock (see Figure 31-1 on
page 344 and Figure 31-2 on page 345)
Additional current consumption compared to
Idle with external clock (see Figure 31-6 on page
347 and Figure 31-7 on page 347)
PRADC 3.2% 12.7%
PRUSART0 3.4% 13.1%
PRSPI 3.3% 13.0%
PRTIM1 3.4% 13.2%
PRLCD 3.5% 13.7%