AT90PWM2 datasheet(317/365 Pages) ATMEL

317 / 365 page

317

4317K–AVR–03/2013

AT90PWM2/3/2B/3B

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

= 3.0V and F = 1MHz. The total current consumption in idle mode with USART, TIMER1, and

SPI enabled, gives:

27.2.1.3

Example 3

All I/O modules should be enabled. Calculate the expected current consumption in active mode

at V

CC = 3.6V and F = 10MHz. We find the active current consumption without the I/O modules

to be ~ 7.0mA (from Figure 27-2). Then, by using the numbers from Table 27-2 - second column,

we find the total current consumption:

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

0.17mA

10.360.220.14

+++





0.29mA



ICCtotal

0.6mA

0.156

0.085

0.053

+++





0.77mA



CCtotal

7.0mA

0.1

0.085

0.043

0.053

0.156

0.105

++++





12.2mA



AT90PWM2 Datasheet(PDF) 317 Page - ATMEL Corporation

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