ST EVALSTPM34 Manuale utente

September 2015

DocID026226 Rev 2

1/15

www.st.com

UM1748

User manual

EVALSTPM34, EVALSTPM33, EVALSTPM32 evaluation board

Introduction

This user manual describes the EVALSTPM34, EVALSTPM33, EVALSTPM32 evaluation board.

The STPM3x is an ASSP family of mixed signals designed for high accuracy measurement of power

and energy in power line systems using the Rogowski coil, current transformer or shunt current sensors.

According to p/n, the device has up to two voltages and two current channels, for energy measurement

in dual-phase and single-phase (with or without neutral current monitoring) electricity metering systems.

The STPM3x devices provide instantaneous voltage and current waveforms and calculate voltage and

current RMS values, active, reactive and apparent powers and energies for each channel. Moreover,

they embed a full set of calibration and compensation parameters which allow the meter to fit tight

accuracy standards (EN 50470-x, IEC 62053-2x, ANSI12.2x for AC watt meters). All calculated data, as

well as configuration parameters, are stored in internal 32-bit registers accessible through SPI or UART

peripheral. Three boards are available for evaluation purpose:

EVALSTPM34 board with 2 CT

EVALSTPM33 board with CT and shunt

EVALSTPM32 board with shunt

The main features of these boards are:

0.2% accuracy single-phase meter reference design

USB port for connection to the isolated hardware programmer STEVAL-IPE023V1 and PC GUI

RS232 and UART isolated port for connection to PC GUI

SPI/UART switch for device peripheral selection

2x programmable LEDs on-board

Digital expansion to external system-on-chip or MCU

Power supply 3.3 V: external or through the STEVAL-IPE023V1 isolated USB board

IEC61000 standard compliant

Contents

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Contents

1Overview ..........................................................................................3

1.1 Safety rules.......................................................................................4

1.2 Operating conditions.........................................................................4

1.3 Recommended readings...................................................................5

1.4 Getting technical support ..................................................................5

2EVALSTPM34, EVALSTPM33, EVALSTPM32 board......................6

2.1 Board description..............................................................................6

2.1.1 Hardware configuration ...................................................................... 6

2.1.2 Power supply...................................................................................... 6

2.1.3 Enable and reset ................................................................................ 6

2.1.4 Digital output....................................................................................... 7

2.1.5 SPI connection ................................................................................... 7

2.1.6 UART connection ............................................................................... 8

2.1.7 Metrology............................................................................................ 8

2.1.8 LED..................................................................................................... 9

2.1.9 Clock................................................................................................... 9

2.1.10 Voltage reference ............................................................................... 9

2.2 Connection to the line .......................................................................9

2.3 Board setup.....................................................................................12

2.3.1 Connection to PC GUI through the STEVAL-IPE023V1.................. 12

2.3.2 Connection to PC GUI through the RS232 port ............................... 12

2.4 The device basic configuration........................................................13

3Revision history ............................................................................14

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Overview

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1 Overview

Figure 1: EVALSTPM34 board

Figure 2: EVALSTPM33 board

Overview

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DocID026226 Rev 2

Figure 3: EVALSTPM32 board

1.1 Safety rules

These boards can be connected to the mains voltage (230 V/110 V). In the case of

improper use, wrong installation or malfunction, there is a danger of serious personal injury

and damage to property. All operations such as: transport, installation, and commissioning,

as well as maintenance, should be carried out by skilled technical personnel (national

accident prevention rules must be observed) only.

1.2 Operating conditions

Table 1: Operating conditions

Parameter

Value

VNnominal voltage

230 VRMS

INnominal current

5 ARMS

Imax. maximum current

100 ARMS

CPconstant pulses

41600 imp/kWh

fline line frequency

50/60 Hz ± 10%

TOP operating temperature

-40/+85 °C

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1.3 Recommended readings

This document describes how to use and set up a basic test session with a GUI interface.

Additional information is available in the following documents:

STPM3x datasheet

AN4470

UM1719

EVALSTPM32 schematics

EVALSTPM33 schematics

EVALSTPM34 schematics

1.4 Getting technical support

All our customers receive free technical assistance through local ST distributor/office or by

visiting www.st.com; upgrades are also available free of charge on www.st.com/metering.

Customers should work with the latest version of software/firmware before contacting us.

EVALSTPM34, EVALSTPM33, EVALSTPM32

board

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2 EVALSTPM34, EVALSTPM33, EVALSTPM32 board

2.1 Board description

2.1.1 Hardware configuration

Table 2: EVALSTPM3x evaluation board setting and configuration terminals

Parameter

Value

3.3 V external DC supply

Device enable and reset

Digital output pins

SPI connector to the USB programmer/reader

DB9 female connector for RS232 port

UART isolated pin connector

RS232 enable

J11a

VREF jumper

SWC1

DIP switch for SPI/UART peripheral selection

Primary voltage

L2b

Secondary voltage

Primary current

Secondary current

2.1.2 Power supply

The board does not contain a power supply. VCC = 3.3 V DC supply should be provided

externally, by J7 connector. If the board is interfaced to PC by the STEVAL-IPE023V1

isolated dongle, it provides the board with supply. Since UART section is isolated, to use

either RS232 or J2 UART connectors, a different isolated 3.3 V supply must be provided

through J2 connector.

2.1.3 Enable and reset

The STPM3x enable pin should be shorted to VCC by keeping J4 jumper in EN position. To

reset the device, this jumper has to be in OFF position (GND).

For the EVALSTPM34 and the EVALSTPM33 board only.

For the EVALSTPM34 board only.

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2.1.4 Digital output

8-pin J5 connector provides all digital output pins of the device as listed in the below table:

Table 3: J5 connector pinout

Connector pin

STPM3x pin

INT1

INT2a

LED2

EN/RST

LED1

GND

CKIN/XTAL2

CKOUT/ZCR

2.1.5 SPI connection

To communicate with the device using the STEVAL-IPE023V1 isolated USB dongle, the

STPM3x SPI peripheral has to be selected. All SWC1 switches have to be in OFF position

before the device powers up. SPI pins are available in J6 connector for 10-pin flat cable

interfacing either to the STEVAL-IPE023V1 or to an external MCU.

Table 4: J6 SPI connector pinout

Name

Description

Not connected

MOSI

GND

MISO

SCS

SCL

Not connected

SYN

Not connected

VCC

The STEVAL-IPE023V1 provides isolation, while J6 pins are not isolated.

For the EVALSTPM34 and the EVALSTPM33 board only.

EVALSTPM34, EVALSTPM33, EVALSTPM32

board

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2.1.6 UART connection

UART peripheral also communicates to the device. In this case, all SWC1 switches should

be in ON position when the device powers up. RS232 port is isolated from the board

through Si8621 transceiver to safely connect the board to PC; in this case, J3 jumper has

to be connected. UART isolated pins are also available on J2 connector for MCU

connection; in this case J3 jumper has to be disconnected. If UART connection is used, a

separate 3.3 VDC has to be provided to UART section.

Table 5: J2 UART connector

Name

Description

RXD

TXD

+3.3 VDC

GND

2.1.7 Metrology

Current sensing is performed by CT or shunt, while voltage is sensed by voltage

dividers.The EVALSTPM34 board has two currents and two voltage channels, while the

EVALSTPM33 has two currents and one voltage channel, the EVALSTPM32 has one

current and one voltage channel available. Main design parameters are listed in the below

table.

Table 6: EVALSTPM3x evaluation board parameters

Channel

Parameter

Value

Primary current

Current sensor sensitivity kSa

2.4 mV/A

Shunt sensor sensitivityb

0.3 mV/A

Primary voltage

R1voltage divider upper resistorc

810000 Ω

R2voltage divider upper resistor

470 Ω

Secondary currentd

kScurrent sensor sensitivity

2.4 mV/A

Secondary voltage

R1 voltage divider upper resistor

81000 Ω

R2 voltage divider upper resistor

470 Ω

Any

CPconstant pulse

41600 pulses/kWh

A 22 nF capacitor in parallel with R2 implements an antialiasing filter for voltage signal.

Regarding to current signal, the antialiasing filter is given by a 10 nF capacitor and 1 kOhm

resistors.

For the EVALSTPM34 board only.

For the EVALSTPM32 and EVALSTPM33 board only.

R1, R2 names do not refer to specific resistors on the schematic, but these names indicate voltage divider

resistors.

For the EVALSTPM34 and EVALSTPM33 board.

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2.1.8 LED

Two LEDs are connected to programmable LED pins of the device.

2.1.9 Clock

Clocking is provided to the board through 16 MHz quartz. 1 MOhm resistor and 15 pF

capacitors are used to filter noise.

2.1.10 Voltage reference

The STPM34 and STPM33 devices embed two internal independent voltage references.

J11 jumper shorts VREF, or it can be used to connect the external precision voltage

reference. The external reference should be connected between the desired VREF and

GND, if a single reference has to be used for both channels, VREF1 and VREF2 should be

shorted by J11.

2.2 Connection to the line

The board can be connected to line voltage and current in several ways, as shown in below

pictures.

Please note that, in boards using shunt, the shunt is at the same potential of voltage

neutral faston and therefore it is at the same potential of the board GND. When isolated

power sources are used or phantom loads, this is not important. In case of connection to

the mains, this has to be taken into account since, according to the wire connected to the

shunt, the board GND may be either at the 0 or 230 V potential.

Figure 4: Board connection to phantom load, dual-phase system (STPM34)

EVALSTPM34, EVALSTPM33, EVALSTPM32

board

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Figure 5: Board connection to phantom load, single-phase system with neutral monitoring

(STPM34 and STPM33)

Figure 6: Board connection to phantom load, single-phase system (STPM3x)

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