
356
8161D–AVR–10/09
ATmega48PA/88PA/168PA/328P
29.2.3
ATmega88PA: Supply Current of IO 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
details.
It is possible to calculate the typical current consumption based on the numbers from
Table 29-4Example
Calculate the expected current consumption in idle mode with TIMER1, ADC, and SPI enabled
at V
to add 13.6% for the TIMER1, 26.3% for the ADC, and 21.5% for the SPI module. Reading from
, we find that the idle current consumption is ~0.027 mA at V
CC = 2.0V
and F = 1MHz. The total current consumption in idle mode with TIMER1, ADC, and SPI enabled,
gives:
Table 29-3.
ATmega88PA: Additional Current Consumption for the different I/O modules
(absolute values)
PRR bit
Typical numbers
VCC = 2V, F = 1 MHz
VCC = 3V, F = 4 MHz
VCC = 5V, F = 8 MHz
PRUSART0
3.0 uA
21.3 uA
97.9 uA
PRTWI
6.1 uA
45.4 uA
219.0 uA
PRTIM2
5.2 uA
35.2 uA
149.5 uA
PRTIM1
3.8 uA
25.6 uA
110.0 uA
PRTIM0
1.5 uA
9.8 uA
39.6 uA
PRSPI
5.2 uA
40.0 uA
199.6 uA
PRADC
6.3 uA
48.7 uA
247.0 uA
Table 29-4.
ATmega88PA: Additional Current Consumption (percentage) in Active and Idle
mode
PRR bit
Additional Current consumption
compared to Active with external
Additional Current consumption
compared to Idle with external
PRUSART0
1.8%
11.4%
PRTWI
3.9%
24.4%
PRTIM2
2.9%
18.6%
PRTIM1
2.1%
13.6%
PRTIM0
0.8%
5.2%
PRSPI
3.5%
21.5%
PRADC
4.2%
26.3%
ICCtotal
0.027 mA (1 + 0.136 + 0.263 + 0.215)
0.043 mA
≈≈