Datasheet

177
ATtiny25/45/85 [DATASHEET]
2586Q–AVR–08/2013
Figure 22-10. Idle Supply Current vs. V
CC
(Internal RC Oscillator, 128 kHz)
22.3 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 Reduc-
tion Register. See “PRR – Power Reduction Register” on page 38 for details.
It is possible to calculate the typical current consumption based on the numbers from Table 22-2 for other V
CC
and
frequency settings that listed in Table 22-1.
IDLE SUPPLY CURRENT vs. V
CC
INTERNAL RC OSCILLATOR, 128 kHz
85 ˚C
25 ˚C
-40 ˚C
0
0,01
0,02
0,03
0,04
0,05
0,06
0,07
0,08
0,09
0,1
1,5 2 2,5 3 3,5 4 4,5 5 5,5
V
CC
(V)
I
CC
(mA)
Table 22-1. 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
PRTIM1 45 uA 300 uA 1100 uA
PRTIM0 5 uA 30 uA 110 uA
PRUSI 5 uA 25 uA 100 uA
PRADC 15 uA 85 uA 340 uA
Table 22-2. Additional Current Consumption (percentage) in Active and Idle mode
PRR bit
Additional Current consumption
compared to Active with external clock
(see Figure 22-1 and Figure 22-2)
Additional Current consumption
compared to Idle with external clock
(see Figure 22-6 and Figure 22-7)
PRTIM1 20 % 80 %
PRTIM0 2 % 10 %
PRUSI 2 % 10 %
PRADC 5 % 25 %