How frequency and powerconsumption are related

[hariprasad]

Posted on August 13, 2015 at 04:54

What I'm about to ask is somethig generic and basic

So everywhere it can be found that for going to low power mode reduce the clock frequency, How reducing clock frequency reduces power consumption ? #low-power #stm32f4 #can #exti #low-power

[John F.]

Posted on August 13, 2015 at 08:56

Some power is always used - because of leakage or by design. Most power is used when devices switch and energy is used to change the voltage of whatever is being driven. These are sometimes called ''static'' and ''dynamic'' power consumption. The more often devices switch states (frequency) the more power is used - roughly linearly - so twice the frequency uses twice the power.

[Nesrine M_O]

Posted on August 13, 2015 at 11:14

Hi arbitrer,

There are several factors contributing to the CPU power consumption; they include dynamic power consumption, static power consumption, and power loss due to transistor leakage currents.The dynamic power consumed by a CPU is approximately proportional to the CPU frequency, and to the square of the CPU voltage: P=CV²f-Syrine-

[Nesrine M_O]

Posted on August 13, 2015 at 11:21

Have a look to this  

http://www.st.com/web/en/resource/technical/document/application_note/DM00096220.pdf

 it may be very helpful-Syrine-