ATmega328P datasheet(404/448 Pages) ATMEL

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8161D–AVR–10/09

ATmega48PA/88PA/168PA/328P

29.4.3

ATmega328P 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

are controlled by the Power Reduction Register. See ”Power Reduction Register” on page 42 for

details.

It is possible to calculate the typical current consumption based on the numbers from Table 29-8

on page 404 for other V

CC and frequency settings than listed in Table 29-7 on page 404.

Example

Calculate the expected current consumption in idle mode with TIMER1, ADC, and SPI enabled

at V

CC = 2.0V and F = 1MHz. From Table 29-8 on page 404, third column, we see that we need

to add 14.5% for the TIMER1, 22.1% for the ADC, and 15.7% for the SPI module. Reading from

Figure 29-145 on page 402, we find that the idle current consumption is ~0.055 mA at V

CC =

2.0V and F = 1MHz. The total current consumption in idle mode with TIMER1, ADC, and SPI

enabled, gives:

Table 29-7.

ATmega328P: Additional Current Consumption for the different I/O modules

(absolute values)

PRR bit

Typical numbers

VCC = 2V, F = 1MHz

VCC = 3V, F = 4MHz

VCC = 5V, F = 8MHz

PRUSART0

3.20 µA

22.17 µA

100.25 µA

PRTWI

7.34 µA

46.55 µA

199.25 µA

PRTIM2

7.34 µA

50.79 µA

224.25 µA

PRTIM1

6.19 µA

41.25 µA

176.25 µA

PRTIM0

1.89 µA

14.28 µA

61.13 µA

PRSPI

6.94 µA

43.84 µA

186.50 µA

PRADC

8.66 µA

61.80 µA

295.38 µA

Table 29-8.

ATmega328P: Additional Current Consumption (percentage) in Active and Idle

mode

PRR bit

Additional Current consumption

compared to Active with external

clock (see Figure 29-139 on page

399 and Figure 29-140 on page

399)

Additional Current consumption

compared to Idle with external

clock (see Figure 29-144 on page

401 and Figure 29-145 on page

402)

PRUSART0

1.4 %

7.8%

PRTWI

3.0 %

16.6 %

PRTIM2

3.3 %

17.8 %

PRTIM1

2.7 %

14.5 %

PRTIM0

0.9 %

4.8 %

PRSPI

2.9 %

15.7 %

PRADC

4.1 %

22.1 %

ICCtotal

0.045 mA (1 + 0.145 + 0.221 + 0.157)

⋅

0.069 mA

≈≈

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