Datasheet

186
8006H–AVR–10/09
ATtiny24/44/84
21.1.1 Example
Calculate the expected current consumption in idle mode with USI, TIMER0, and ADC enabled
at V
CC
= 2.0V and f = 1MHz. From Table 21-2 on page 186, third column, we see that we need to
add 6.1% for the USI, 10.4% for TIMER0, and 28.8% for the ADC. Reading from
Figure 21-6 on
page 189
, we find that current consumption in idle mode at 2V and 1MHz is about 0.04mA. The
total current consumption in idle mode with USI, TIMER0, and ADC enabled is therefore:
21.2 Active Supply Current
Figure 21-1. Active Supply Current vs. Low Frequency (0.1 - 1.0 MHz)
Table 21-2. Additional Current Consumption (percentage) in Active and Idle mode
PRR bit
Current consumption additional to
active mode with external clock
(see Figure 21-1 and Figure 21-2)
Current consumption additional to
idle mode with external clock
(see Figure 21-6 and Figure 21-7)
PRTIM1 1.8 % 8.0 %
PRTIM0 2.3 % 10.4 %
PRUSI 1.4 % 6.1 %
PRADC 6.7 % 28.8 %
ICCTOT 0.04mA 1 0.061 0.104 0.288+++()× 0.06mA≈≈
ACTIVE SUPPLY CURRENT vs. LOW FREQUENCY
(PRR=0xFF)
5.5 V
5.0 V
4.5 V
4.0 V
3.3 V
2.7 V
1.8 V
0
0.2
0.4
0.6
0.8
1
1.2
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Frequency (MHz)
I
CC
(mA)