Rainbow Electronics ATtiny861_V - Manual (Page 200)

200
2588B–AVR–11/06
ATtiny261/461/861
Figure 24-10. Idle Supply Current vs. V
CC
(Internal RC Oscillator, 128 kHz)
24.3 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
”PRR – Power Reduction Register” on
page 37 for details.
It is possible to calculate the typical current consumption based on the numbers from Table 24-1
for other V
CC
and frequency settings than listed in Table 24-2 .
IDLE SUPPLY CURRENT vs. V
CC
INTERNAL RC OSCILLATOR, 128 kHz
85 ˚C
25 ˚C
-40 ˚C
0
0,02
0,04
0,06
0,08
0,1
0,12
0,14
0,16
0,18
0,2
1,5 2 2,5 3 3,5 4 4,5 5 5,5
V
CC
(V)
I CC
(mA)
Table 24-1. 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
PRTIM1 65 uA 423 uA 1787 uA
PRTIM0 7 uA 39 uA 165 uA
PRUSI 5 uA 25 uA 457 uA
PRADC 18 uA 111 uA 102 uA
Table 24-2. Additional Current Consumption (percentage) in Active and Idle mode
PRR bit
Additional Current consumption
compared to Active with external
clock (see
Figure 24-1 on page
195 and Figure 24-2 on page 196 )
Additional Current consumption
compared to Idle with external
clock (see
Figure 24-6 on page
198 and Figure 24-7 on page 198 )
PRTIM1 26.9 % 103.7 %
PRTIM0 2.6 % 10.0 %
PRUSI 1.7 % 6.5 %
PRADC 7.1 % 27.3 %