November 2011

Doc ID 018812 Rev 1

1/11

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:

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.

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