April 2010

Doc ID 17105 Rev 1

1/26

AN3157

Application note

STEVAL-IPE010V1 poly-phase demonstration kit

for the STPMC1 and STPMS1

Introduction

This application note describes the STEVAL-IPE010V1 poly-phase demonstration kit for the

STPMC1 and STPMS1.The STPMC1 is a metering ASSP implemented through an

advanced 0.35 µm BCD6 technology.

The STPMC1 device functions as an energy calculator in power line systems, using the

Rogowski current transformer and shunt or Hall current sensors. It is used in combination

with one or more STPMS1 devices. It implements all the functions needed in a 1, 2 or 3-

phase energy meter, providing the effective measurement of active and reactive energies,

services, from 2 to 4 wires.

In a stand-alone configuration the STPMC1, which sends a pulse train signal with a

frequency proportional to the cumulative active power, can directly drive a stepper motor,

therefore implementing a simple active energy meter.

This device can also be coupled to a microprocessor for multi-function energy meters. In this

case, the measured data is read at a fixed time interval from the device internal registers by

the microcontroller through the SPI interface.

The STPMS1 is an ASSP designed as a building block for single or multi-phase energy

meters. It consists of a pre-amplifier and two 1st order

ΔΣ modulators, band-gap voltage

reference, a low-drop voltage regulator and DC buffers in its analog section, and a clock

generator and output multiplexer in its digital section.

The demonstration kit is made up of a main board with the STPMC1 mounted, and it can be

coupled with up to 5 daughterboards, each with an STPMS1 mounted to sense the voltage

and current of each phase.

Note:

The demonstration kit is available on request.

Figure 1.

Demonstration kit block diagram

Current

Sens or

Current

ns or

rent

ns or

Vol t a ge

Sens or

ta ge

Sens or

ta ge

ns or

Current

Sens or

STPMS1

STPMS1

STPMS1

STPMS1

STPMC1

DAR

DAS

DAH

CL K

XTAL 1

XTAL 2

VSS VSS A

MOP

MON

VOT P

VCC

DAN

DAT

VDD

SDA- TD

SCL - NC

SYN- NP

SCS

LED

STPMC1

DAR

DAS

DAH

CL K

XTAL 1

XTAL 2

VSS VSS A

MOP

MON

VOT P

VCC

DAN

DAT

VDD

SDA- TD

SCL - NC

SYN- NP

SCS

LED

r ent

ns or

t a ge

Sens or

STPMS

M

M 1

Cur r ent

ns or

t a ge

ns or

STPMS

M

M 1

Cur r ent

Sens or

STPMS

M

M 1

P1

P1

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