AN3398 Datasheet, PDF (1/11 Pages) STMicroelectronics – Fast digital calibration procedure

AN3398
Application note
Fast digital calibration procedure for
STPMC1 based energy meters
Introduction
The STPMC1 device functions as an energy calculator and is an ASSP designed for
effective energy measurement in power line systems utilizing Rogowski coil, current
transformer, and Shunt or Hall current sensors. Used in combination with one or more
STPMSx ICs, it implements all the functions needed in a 1, 2, or 3-phase energy meter.
Due to its internal structure and features, STPMC1 allows a more effective and innovative
calibration procedure, which is explained in this document.
Advantages of this procedure are:
■ reduced calibration time
■ no need for re-calibration (calibration parameter can be written in a permanent way).
For further information about the device please refer to the STPMC1 datasheet.
This application note integrates the AN2299 application note for the STPMC1 metering chip.
Sections 1, 2, and 3.1 of the AN2299 application note can be considered valid also for the
STPMC1 device, sharing the same architecture as STPM01 and STPM10 devices, whilst
the calibration calculations shown in section 3.2 of AN2299 and in this document are slightly
different and are reported below.
November 2011
Doc ID 018812 Rev 1
1/11
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