AT90PWM2B-16SU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT90PWM2B-16SU

8-bit Atmel Microcontroller with 8K Bytes In-System Programmable Flash

Atmel Corporation 

AT90PWM2/3/2B/3B

27.2.1.1

27.2.1.2

27.2.1.3

Table 27-2.

PRR bit

PRPSC2

PRPSC1

PRPSC0

PRTIM1

PRTIM0

PRSPI

PRUSART

PRADC

Additional Current Consumption (percentage) in Active and Idle mode

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)

10%

25%

10%

25%

10%

25%

8.5%

22%

4.3%

11%

5.3%

14%

15.6

36

10.5%

25%

It is possible to calculate the typical current consumption based on the numbers from Table 27-2

for other VCC and frequency settings than listed in Table 27-1.

Example 1

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

enabled at VCC = 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 VCC = 3.0V and F = 1MHz. The

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

ICCtotal  0.17mA  1 + 0.36 + 0.22 + 0.14  0.29mA

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 VCC

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

SPI enabled, gives:

ICCtotal  0.6mA  1 + 0.156 + 0.085 + 0.053  0.77mA

Example 3

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

at VCC = 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:

CCtotal  7.0mA  1 + 0.1 + 0.1 + 0.1 + 0.085 + 0.043 + 0.053 + 0.156 + 0.105  12.2mA

4317K–AVR–03/2013

317

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