AT90PWM2 datasheet(314/361 Pages) ATMEL

314 / 361 page

314

4317J–AVR–08/10

AT90PWM2/3/2B/3B

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 27-2

for other V

CC and frequency settings than listed in Table 27-1.

27.2.1.1

Example 1

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

enabled at V

CC = 3.0V and F = 1MHz. From Table 27-2, third column, we see that we need to

add 18% for the USART, 26% for the SPI, and 11% for the TIMER1 module. Reading from Fig-

ure 27-5

, we find that the idle current consumption is ~0,17mA at V

CC = 3.0V and F = 1MHz. The

total current consumption in idle mode with USART0, TIMER1, and SPI enabled, gives:

27.2.1.2

Example 2

Same conditions as in example 1, but in active mode instead. From Table 27-2, second column

we see that we need to add 3.3% for the USART, 4.8% for the SPI, and 2.0% for the TIMER1

module. Reading from Figure 27-1, we find that the active current consumption is ~0,6mA at V

Table 27-1.

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

PRR bit

Typical numbers

VCC = 3V, F = 8MHz

VCC = 5V, F = 16MHz

PRPSC2

350 uA

1.3 mA

PRPSC1

350 uA

1.3 mA

PRPSC0

350 uA

1.3 mA

PRTIM1

300 uA

1.15 mA

PRTIM0

200 uA

0.75 mA

PRSPI

250 uA

0.9 mA

PRUSART

550 uA

2 mA

PRADC

350 uA

1.3 mA

Table 27-2.

Additional Current Consumption (percentage) in Active and Idle mode

PRR bit

Additional Current consumption

compared to Active with external

clock

(see Figure 27-1 and Figure 27-2)

Additional Current consumption

compared to Idle with external clock

(see Figure 27-5 and Figure 27-6)

PRPSC2

10%

25%

PRPSC1

10%

25%

PRPSC0

10%

25%

PRTIM1

8.5%

22%

PRTIM0

4.3%

11%

PRSPI

5.3%

14%

PRUSART

15.6

PRADC

10.5%

25%

ICCtotal

0.17

10.360.220.14

+++

()

•

0.29

≈≈

AT90PWM2 Datasheet(PDF) 314 Page - ATMEL Corporation

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