ATtiny25 datasheet(160/196 Pages) ATMEL

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160

7598H–AVR–07/09

ATtiny25/45/85

23.2.1

Using the Power Reduction Register

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 33 for

details.

It is possible to calculate the typical current consumption based on the numbers from Table 2 for

other V

CC and frequency settings than listed in Table 1.

23.2.1.1

Example 1

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

at V

CC = 2.0V and F = 1MHz. From Table 23-2, third column, we see that we need to add 6.4%

for the USI, 7.3% for the TIMER0 module, and 21.4% for the ADC module. Reading from Figure

23-9, we find that the idle current consumption is ~0,25mA at V

CC = 3.0V and F = 1MHz. The

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

Table 23-1.

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

PRTIM1

43 uA

270 uA

1090 uA

PRTIM0

5.0 uA

28 uA

116 uA

PRUSI

4.0 uA

25 uA

102 uA

PRADC

13 uA

84 uA

351 uA

Table 23-2.

Additional Current Consumption (percentage) in Active and Idle mode

PRR bit

Additional Current consumption

compared to Active with external

clock

(see Figure 23-1 and Figure 23-2)

Additional Current consumption

compared to Idle with external clock

(see Figure 23-6 and Figure 23-7)

PRTIM1

17.3%

68.4 %

PRTIM0

1.8 %

7.3 %

PRUSI

1.6 %

6.4 %

PRADC

5.4 %

21.4 %

ICCtotal

0,25

()mA

0,064

0,073

0,214

+++

()

•

0,337

≈≈

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