ATmega88PA Automotive Atmel Corporation, ATmega88PA Automotive Datasheet - Page 349

• Manufacturer Part Number: ATmega88PA Automotive
• Manufacturer: Atmel Corporation

30.3.3
30.3.3.1
9223B–AVR–09/11
Supply Current of IO Modules
Example
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
for details.
Table 30-5.
Table 30-6.
It is possible to calculate the typical current consumption based on the numbers from
30-2 on page 327
Calculate the expected current consumption in idle mode with TIMER1, ADC, and SPI
enabled at V
we need to add 11.2% for the TIMER1, 22.1% for the ADC, and 17.6% for the SPI module.
Reading from
at V
and SPI enabled, gives:
I
PRR bit
PRUSART0
PRTWI
PRTIM2
PRTIM1
PRTIM0
PRSPI
PRADC
PRR bit
PRUSART0
PRTWI
PRTIM2
PRTIM1
PRTIM0
PRSPI
PRADC
CC
total
CC
Atmel ATmega48PA/88PA/168PA [Preliminary]
= 2.0V and F = 1MHz. The total current consumption in idle mode with TIMER1, ADC,
0.028 mA
CC
Figure 30-3 on page
Additional Current Consumption for the Different I/O Modules (Absolute
Values)
Additional Current Consumption (Percentage) in Active and Idle Mode
= 2.0V and F = 1MHz. From
for other V
Typical numbers
Additional Current consumption
compared to Active with external
clock (see
and
(1 + 0.112 + 0.221 + 0.176)
V
Figure 30-2 on page
CC
= 2V, F = 1MHz
2.9µA
6.0µA
5.0µA
3.6µA
1.4µA
5.0µA
6.1µA
CC
Figure 30-1 on page 325
and frequency settings than listed in
1.8%
3.9%
2.9%
2.1%
0.8%
3.3%
4.2%
326, we find that the idle current consumption is ~0.028mA
325)
Table 30-2 on page
V
0.042 mA
CC
= 3V, F = 4MHz
20.7µA
44.8µA
34.5µA
24.4µA
38.0µA
47.4µA
9.5µA
“Power Reduction Register” on page 42
Additional Current consumption
compared to Idle with external clock
(see
Figure 30-4 on page
Figure 30-3 on page 326
327, third column, we see that
Table 30-1 on page
11.4%
20.6%
15.7%
11.2%
17.6%
22.1%
V
4.2%
CC
= 5V, F = 8MHz
326)
219.7µA
141.3µA
107.7µA
190.4µA
244.7µA
97.4µA
38.4µA
and
Table
327.
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