Power Consumption in embedded SRAM in a wireless sensor node

[Yaso]

Hey everyone,

I am trying to calculate the power consumed by the embedded SRAM in wireless sensor network node (wsn) during its active period (during reading and writing). I used the following formula: Ptotal = (Pread*Naccess) + (Pwrite*Naccess). The number of times we read and write to the eSRAM are different. Do we read more than we write in a wsn?? Like can I consider it as 70% of the time we read and 30% we write??

Any help is appreciated.

 

[ahmed-agt]

Hi!
I don't think one will be able to get the actual power, but an estimated will be ok. However, what you are looking for is in the datasheet of the sram. Check the Electrical properties in terms on absolute and tested result from the manufacturer.

Good luck.

 

[Yaso]

Thank you. But even if I'm only able to calculate the estimated power, do we read from a memory more than we write to it under the context of wsn nodes? Can I consider such an assumption true?

 

[ahmed-agt]

Hi!
From what you have raised, its complex the way you want to do the analysis. Meanwhile, since the voltage is constant to the system, a low current sinking resistor can be use to sense current consumed. A controller with adc can do the conversion, then use your power math. to calculate.
I am saying this because, I don't thing you are interested in power consume in a micro-seconds time. If in micro-seconds use datasheet as reference.