AT90PWM2 datasheet(328/365 Pages) ATMEL

328 / 365 page

328

AT90PWM2/3

4317B–AVR–02/05

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.

Example 1

Calculate the expected current consumption in idle mode with USART0, TIMER1, and

TWI enabled at V

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

need to add 18% for the USART0, 26% for the TWI, and 11% for the TIMER1 module.

Reading from Figure 3, we find that the idle current consumption is ~0,075mA at V

CC =

3.0V and F = 1MHz. The total current consumption in idle mode with USART0, TIMER1,

and TWI enabled, gives:

Example 2

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

umn we see that we need to add 3.3% for the USART0, 4.8% for the TWI, and 2.0% for

the TIMER1 module. Reading from Figure 1, we find that the active current consumption

is ~0,42mA at V

CC = 3.0V and F = 1MHz. The total current consumption in idle mode

with USART0, TIMER1, and TWI enabled, gives:

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 with-

out the I/O modules to be ~ 4.0mA (from Figure 2). Then, by using the numbers from

Table 2 - second column, we find the total current consumption:

PRTIM1

2.0%

11%

PRTIM0

1.6%

8.5%

PRSPI

6.1%

33%

PRADC

4.9%

26%

Table 140.

Additional Current Consumption (percentage) in Active and Idle mode (Continued)

PRR bit

Additional Current consumption

compared to Active with external

clock

(see Figure 155 and Figure 156)

Additional Current consumption

compared to Idle with external

clock

(see Figure 161 and Figure 162)

ICCtotal

0,075mA

10,180,260,11

()

•

0,116mA

≈≈

ICCtotal

0,42mA

0,033

0,048

0,02

+++

()

•

0,46mA

≈≈

ICCtotal

4,0mA

0,033

0,048

0,047

0,02

0,016

0,061

0,049

++++

+++

()

•

5,1mA

≈≈

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