ATmega165 datasheet(291/336 Pages) ATMEL

291 / 336 page

291

ATmega165/V

2573G–AVR–07/09

Example 1

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

SPI enabled at V

CC = 3.0V and F = 1MHz. From Table 121, second column, we see that

we need to add 12.4% for the USART0, 10.8% for the SPI, and 18.6% for the TIMER1

module. Reading from Figure 137, we find that the idle current consumption is ~0.18mA

at V

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

TIMER1, and SPI enabled, gives:

Example 2

Same conditions as in example 1, but in active mode instead. From Table 121, second

column we see that we need to add 3.7% for the USART0, 3.2% for the SPI, and 5.6%

for the TIMER1 module. Reading from Figure 132, we find that the active current con-

sumption is ~0.6mA at V

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

mode with USART0, TIMER1, and SPI enabled, gives:

Example 3

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

active mode at V

CC = 3.3V and F = 10MHz. We find the active current consumption with-

out the I/O modules to be ~ 5.6mA (from Figure 133). Then, by using the numbers from

Table 121 - first column, we find the total current consumption:

Power-down Supply

Current

Figure 142. Power-down Supply Current vs. V

CC (Watchdog Timer Disabled)

ICCtotal

0.18

0.124

0.108

0.186

+++

()

•

0.26

≈≈

ICCtotal

0.6

0.037

0.032

0.056

()

•

0.68

≈≈

ICCtotal

5.6

0.056

0.037

0.032

0.056

0.059

+++++

()

•

6.9

≈≈

POWER-DOWN SUPPLY CURRENT vs. VCC

WATCHDOG TIMER DISABLED

0.5

1.5

2.5

3.5

1.5

2.5

3.5

4.5

5.5

VCC (V)

°C

-40

°C

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