ATtiny261-ESSZ datasheet(199/227 Pages) ATMEL

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199

7753C–AVR–07/09

ATtiny261/ATtiny461/ATtiny861

24.3

Supply Current of I/O 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 “PRR – Power Reduction Register” on

page 38 for details.

It is possible to calculate the typical current consumption based on the numbers from Table 24-1

for other V

CC and frequency settings than listed in Table 24-2.

24.3.1

Example

Calculate the expected current consumption in idle mode with TIMER0, ADC, and USI enabled

at V

CC = 2.0V and F = 1MHz. From Table 24-2, third column, we see that we need to add 10%

for the TIMER0, 27.3% for the ADC, and 6.5% for the USI module. Reading from Figure 24-3 on

page 198, we find that the idle current consumption is ~0,085 mA at V

CC = 2.0V and F=1MHz.

The total current consumption in idle mode with TIMER0, ADC, and USI enabled, gives:

Table 24-1.

Additional Current Consumption for the different I/O modules (absolute values)

PRR bit

Typical numbers

CC = 2V, F = 1MHz

CC = 3V, F = 4MHz

CC = 5V, F = 8MHz

PRTIM1

65 uA

423 uA

1787 uA

PRTIM0

7 uA

39 uA

165 uA

PRUSI

5 uA

25 uA

457 uA

PRADC

18 uA

111 uA

102 uA

Table 24-2.

Additional Current Consumption (percentage) in Active and Idle mode

PRR bit

Additional Current consumption

compared to Active with external

clock (see Figure 24-1 on page 197

and Figure 24-2 on page 198)

Additional Current consumption

compared to Idle with external clock

PRTIM1

26.9%

103.7%

PRTIM0

2.6%

10.0%

PRUSI

1.7%

6.5%

PRADC

7.1%

27.3%

ICCtotal

0,085

0,10

0,273

0,065

()

•

0,122

≈≈

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