Recently I have come across Energy Meter IC "CS5463". I read the datasheet and it says that the internal registers of the IC stores the Power information as a percentage. My understanding is that I have to multiply the percentage with a number to get the absolute power rather than normalized power. My question is what that number should be?
Full scale is the maximum value that the register or channel can holdor display.
section 5.1 on page 16 says
The full-scale differential input voltage for the current and voltage channel is 250 mVP.
Current may be sensed eg with an inline shunt rsistor.
By choosing a shunt resistance or other means the current which causes 250 mV peak to occur at the current input is the full scale current.
Voltage may be sensed with a resistive divider.
The input voltage which when applied to the installed resistive divider causes 250 mV peak to occur at the voltage input for is the full scale voltage.