ST EVALSTPM34 User Manual
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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
September 2015
DocID026226 Rev 2
UM1748
User manual
www.st.com
1/15

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Summary of Contents for ST EVALSTPM34

  • Page 1 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.
  • Page 2: Table Of Contents

    Overview ..................3 Safety rules ..................4 Operating conditions ................. 4 Recommended readings ..............5 Getting technical support ..............5 EVALSTPM34, EVALSTPM33, EVALSTPM32 board ...... 6 Board description ................6 2.1.1 Hardware configuration ..............6 2.1.2 Power supply ..................6 2.1.3...
  • Page 3: Overview

    UM1748 Overview Overview Figure 1: EVALSTPM34 board Figure 2: EVALSTPM33 board DocID026226 Rev 2 3/15...
  • Page 4: Safety Rules

    Overview UM1748 Figure 3: EVALSTPM32 board 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.
  • Page 5: Recommended Readings

    EVALSTPM34 schematics 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.
  • Page 6: Evalstpm34, Evalstpm33, Evalstpm32 Board

    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.
  • Page 7: Digital Output

    STEVAL-IPE023V1 or to an external MCU. Table 4: J6 SPI connector pinout Name Description Not connected MOSI MISO Not connected Not connected The STEVAL-IPE023V1 provides isolation, while J6 pins are not isolated. For the EVALSTPM34 and the EVALSTPM33 board only. DocID026226 Rev 2 7/15...
  • Page 8: Uart Connection

    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.
  • Page 9: Led

    UM1748 EVALSTPM34, EVALSTPM33, EVALSTPM32 board 2.1.8 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.
  • Page 10 EVALSTPM34, EVALSTPM33, EVALSTPM32 UM1748 board 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) 10/15 DocID026226 Rev 2...
  • Page 11 UM1748 EVALSTPM34, EVALSTPM33, EVALSTPM32 board Figure 7: Board connection to isolated AC source (STPM34 and STPM33) Figure 8: Board connection to mains DocID026226 Rev 2 11/15...
  • Page 12: Board Setup

    EVALSTPM34, EVALSTPM33, EVALSTPM32 UM1748 board Board setup Regarding to the STPM3x evaluation software setup and use, please refer to user manual UM1719. The STEVAL-IPE023V1 is not included in the package, therefore it should be ordered separately. Please read the user manual, before using it.
  • Page 13: The Device Basic Configuration

    During the startup, all internal device parameters are in the default value. For the EVALSTPM34 board, primary channel gain GAIN[1:0] has to be changed to value 0 (current gain = x2), a correct energy measurement is, in this manner, assured. All other parameters can be changed according to the needs (board calibration, phase-shift compensation, desired output on the programmable pin).
  • Page 14: Revision History

    Revision history UM1748 Revision history Table 7: Document revision history Date Revision Changes 16-Apr-2014 Initial release. Updated recommended readings, power supply, board setup and the device basic configuration section. Removed the schematic section. 30-Sep-2015 Changed figure titled "Board connection to phantom load, single- phase system (STPM3x)"...
  • Page 15 ST products and/or to this document at any time without notice. Purchasers should obtain the latest relevant information on ST products before placing orders. ST products are sold pursuant to ST’s terms and conditions of sale in place at the time of order acknowledgement.

This manual is also suitable for:

Evalstpm33Evalstpm32

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