CS5480 datasheet(20/70 Pages) CIRRUS

20 / 70 page

CS5480

DS980F3

These offsets can be either positive or negative,

indicating crosstalk coupling either in phase or out of

phase with the applied voltage input. The power offset

registers can compensate for either condition.

To use this feature, measure the average power at no

load. Take the measured result (from the P1AVG

(P2AVG) register), invert (negate) the value, and write it

to the associated average active power offset register,

P1OFF (P2OFF).

4.10 Average Reactive Power Offset

The average reactive power offset registers, Q1OFF

(Q2OFF), can be used to offset erroneous power

sources resident in the system not originating from the

power line. Residual reactive power offsets are usually

caused by crosstalk into current channels from voltage

channels, or from ripple on the meter’s or chip’s power

supply, or from inductance from a nearby transformer.

These offsets can be either positive or negative,

depending on the phase angle between the crosstalk

coupling and the applied voltage. The reactive power

offset registers can compensate for either condition. To

use this feature, measure the average reactive power at

no load. Take the measured result from the

Q1AVG (Q2AVG) register, invert (negate) the value and

write it to the associated reactive power offset register,

Q1OFF (Q2OFF).

CS5480 Datasheet(PDF) 20 Page - Cirrus Logic