ATmega328P datasheet(332/448 Pages) ATMEL

332 / 448 page

332

8161D–AVR–10/09

ATmega48PA/88PA/168PA/328P

29.1.3

ATmega48PA: 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 29-2

on page 332 for other V

CC and frequency settings than listed in Table 29-1 on page 332.

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 29-2 on page 332, third column, we see that we need

to add 11.2% for the TIMER1, 22.1% for the ADC, and 17.6% for the SPI module. Reading from

Figure 29-6 on page 329

, we find that the idle current consumption is ~0.028 mA at V

CC = 2.0V

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

gives:

Table 29-1.

ATmega48PA: 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

2.9 uA

20.7 uA

97.4 uA

PRTWI

6.0 uA

44.8 uA

219.7 uA

PRTIM2

5.0 uA

34.5 uA

141.3 uA

PRTIM1

3.6 uA

24.4 uA

107.7 uA

PRTIM0

1.4 uA

9.5 uA

38.4 uA

PRSPI

5.0 uA

38.0 uA

190.4 uA

PRADC

6.1 uA

47.4 uA

244.7 uA

Table 29-2.

ATmega48PA: Additional Current Consumption (percentage) in Active and Idle

mode

PRR bit

Additional Current consumption

compared to Active with external

clock (see Figure 29-1 on page

327 and Figure 29-2 on page 327)

Additional Current consumption

compared to Idle with external

clock (see Figure 29-6 on page

329 and Figure 29-7 on page 330)

PRUSART0

1.8%

11.4%

PRTWI

3.9%

20.6%

PRTIM2

2.9%

15.7%

PRTIM1

2.1%

11.2%

PRTIM0

0.8%

4.2%

PRSPI

3.3%

17.6%

PRADC

4.2%

22.1%

ICCtotal

0.028 mA (1 + 0.112 + 0.221 + 0.176)

⋅

0.042 mA

≈≈

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