Datasheet

364
8284D–AVR–6/11
ATmega169A/PA/329A/PA/3290A/PA/649A/P/6490A/P
Figure 30-10. ATmega169A: Idle Supply Current vs. V
CC
(32kHz Watch Crystal)
30.1.3 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 Reduction Register. See ”PRR – Power Reduction Register” on
page 46 for details.
It is possible to calculate the typical current consumption based on the numbers from Table 30-2
for other V
CC
and frequency settings than listed in Table 30-1.
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 30-1. 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 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)
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%