EVALSTPM34, EVALSTPM33, EVALSTPM32 evaluation board
Contents
1. ETI UM1 748 V life augmented 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 e 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 port2. EVALSTPM34 EVALSTPM33 EVALSTPM32 board LED Two LEDs are connected to programmable LED pins of the device Clock Clocking is provided to the board through 16 MHz quartz 1 MOhm resistor and 15 pF capacitors are used to filter noise Voltage reference The STPM34 and STPM33 devices embed two internal independent voltage references J11 jumper shorts Veer or it can be used to connect the external precision voltage reference The external reference should be connected between the desired Vrer and GND if a single reference has to be used for both channels Vrer1 and Vrer2 should be shorted by J11 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 DoclID026226 Rev 2 9 15 EVALSTPM34 EVALSTPM33 EVALSTPM32 UM1 748 board Figure 5 Board connection to phantom load single phase system with neutral monitoring STPM34 and STPM33 Figure 6 Board connection to ph
3. 3 VDC has to be provided to UART section Table 5 J2 UART connector Name Description 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 Current sensor sensitivity ks 2 4 mV A Primary current Shunt sensor sensitivity 0 3 mV A Ri voltage divider upper resistor 810000 Q Primary voltage Re voltage divider upper resistor 4700 R1 voltage divider upper resistor 81000 Q Secondary voltage R2 voltage divider upper resistor 4700 Any Cp constant 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 Secondary current ks current sensor sensitivity 2 4 mV A A 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 d For the EVALSTPM34 and EVALSTPM33 board 8 15 DocID026226 Rev 2 ky UM1748 2 1 8 2 1 9 2 1 10 2 2
4. to use and set up a basic test session with a GUI interface Additional information is available in the following documenis STPM3x datasheet AN4470 UM1719 EVALSTPM32 schematics EVALSTPM33 schematics 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 DoclID026226 Rev 2 5 15 EVALSTPM34 EVALSTPM33 EVALSTPM32 UM1748 board 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 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 IPEO23V1 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 a For the EVALSTPM34 and the EVALSTPM33 board only b For the EVALSTPM34 board only 4 6 15
5. 15 DociD026226 Rev 2 Kyy UM1748 Overview 1 Overview Figure 1 EVALSTPM34 board HI ni ha Fi s HEGE pi 4 gi rj Sn F ho vail VALSTPRS O g okni Ne i DEMO BOARD ONLY FOR EVALUATION PURPOSE Figure 2 EVALSTPM33 board BEBE Sips sre ee zira d me E gt EVALSTPM33 34 z a TL m r r e 3 DocID026226 Rev 2 3 15 Overview 7g Figure 3 EVALSTPM32 board f re ener v ax sva i i prene F nig z 3 MENTE z ud ca En LEDI LED2 epre 1 Digital 4 z ayy see je yF S ra EVALSTPM32 Se sed V EJ DEMO BOARD ONLY FOR EVALUATIU URPOS 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 Vn nominal voltage 230 Vrms Imax Maximum current 100 Arms Cp constant pulses 41600 imp kWh fiine line frequency 50 60 Hz 10 Top operating temperature 40 85 C 1 4 15 DociD026226 Rev 2 UM1748 1 3 1 4 1 Overview Recommended readings This document describes how
6. B board to the EVALSTPM3x board 7 Power on AC source and DC source 8 Open GUI 9 When green LED on the STEVAL IPE023V1 starts blinking click options then interface select USB and select the proper serial port baud rate is 19200 10 Now you can read write sample or calibrate the device Connection to PC GUI through the RS232 port To evaluate the board using a PC RS232 port and the STPM3x evaluation software 1 Put J4 enable jumper in EN position 2 Put SWC1 switches in ON position to UART serigraphy 3 Connect J7 connector and J2 connectors to 3 3 V DC separated and isolated power supply 4 Enable RS232 port by inserting J3 jumper 5 Connect the EVALSTPM3x board to either AC line or power source or phantom load as shown in Section 2 1 Board description without powering it on 6 Connect the serial cable both to the board and to PC 7 Power on AC source and DC source 8 Open GUI 9 Click options then interface select UART and select the proper serial port baud rate is 9600 10 Now you can read write sample or calibrate the device 0 DocID026226 Rev 2 UM1748 2 4 4 EVALSTPM34 EVALSTPM33 EVALSTPM32 board 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 lt x2 a correct energy measurement is in this manner assured All o
7. DociD026226 Rev 2 UM1 748 EVALSTPM34 EVALSTPM33 EVALSTPM32 board 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 INT a 1 roze 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 IPEO23V1 or to an external MCU Table 4 J6 SPI connector pinout Name Description MOSI GND MISO SCS Not connected SYN Not connected 0 VCC UN NE SOL a NE a The STEVAL IPEO23V1 provides isolation while J6 pins are not isolated a For the EVALSTPM34 and the EVALSTPM33 board only Kyy DocID026226 Rev 2 7 15 EVALSTPM34 EVALSTPM33 EVALSTPM32 UM1 748 board 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
8. antom load single phase system STPM3x 10 15 DociD026226 Rev 2 ky UM1 748 EVALSTPM34 EVALSTPM33 EVALSTPM32 board Figure 7 Board connection to isolated AC source STPM34 and STPM33 Isolated Figure 8 Board connection to mains GALVANIC ISOLATION 3 3 V from ISOLATED 3 3 V from ISOLATED DC supply DC supply EVALSTPMS2 SJE MI EVALUATI RPU Do not connect N terminal since shunt is already at the same potential DociD026226 Rev 2 11 15 EVALSTPM34 EVALSTPM33 EVALSTPM32 UM1748 board 2 3 2 3 1 2 3 2 12 15 Board setup Regarding to the STPM3x evaluation software setup and use please refer to user manual UM1719 The STEVAL IPEO23V1 is not included in the package therefore it should be ordered separately Please read the user manual before using it Connection to PC GUI through the STEVAL IPE023V1 To evaluate the board using the STEVAL IPE023V1 and the STPM3x evaluation software 1 Put J4 enable jumper in EN position 2 Put SWC1 switches in OFF position to SPI serigraphy 3 Connect J7 connector to 3 3 V DC isolated power supply or put J4 jumper in the STEVAL IPEO23V1 board in 1 2 position supply voltage set to 3 3 V 4 Connect the EVALSTPM3x board to either AC line or power source or phantom load as shown in Section 2 1 Board description without powering it on 5 Connect the USB cable both to the STEVAL IPE023V1 board and to PC 6 Connect the flat SPI cable from US
9. 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 IPEO23V1 isolated USB board IEC61000 standard compliant September 2015 DoclID026226 Rev 2 1 15 www st com Contents UM1 748 Contents 1 Aa W caaeaae EM ME REV MERE 3 1 1 Safety rules nena 4 1 2 OPEN CONO a o a oa oa a ae one 4 1 3 Recommended readings ne 5 1 4 Getting technical support 5 2 EVALSTPM34 EVALSTPM33 EVALSTPM32 board 6 2 1 Board CE SCM DU OM RR a a ui V Na Rum 6 2 1 1 Hardware configuration ena 6 2 1 2 Power SUDI a A IE LI A Ra ERA 6 2 1 3 AIS ANG ee a ii A E SVE AMNIE METRE 6 2 1 4 Digital Output RR A EEA AE A ER ANA 7 2 1 5 I COMMECHOMN A k EJ PRA EEA ARE RAM RE RA MARE IVANA MNE 7 2 1 6 UART COMMOCCUON eni EE eval eine 8 2 1 7 VGILKO eo AY AAEN 8 DS TED eana A E AEN A NAE 9 aS COK e A A O A ME A AA MN 9 2 1 10 Voltage reference aaa 9 2 2 CONNECTION tO the line ee 9 2 3 BOA Se UD a E a a Mt MVM 12 2 3 1 Connection to PC GUI through the STEVAL IPEO23V1 12 2 3 2 Connection to PC GUI through the RS232 port 12 2 4 The device basic configuration 13 3 FRE VISION NISO oe ai ek Pete Ni dale ei ae ee aa 14 2
10. se express or implied to any intellectual property right is granted by ST herein Resale of ST products with provisions different from the information set forth herein shall void any warranty granted by ST for such product ST and the ST logo are trademarks of ST All other product or service names are the property of their respective owners Information in this document supersedes and replaces information previously supplied in any prior versions of this document 2015 STMicroelectronics All rights reserved 4 DociD026226 Rev 2 15 15
11. ther parameters can be changed according to the needs board calibration phase shift compensation desired output on the programmable pin For further information on the device configuration please refer to the STPM3x datasheet DociD026226 Rev 2 13 15 Revision history UM1748 3 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 2 Changed figure titled Board connection to phantom load single phase system STPM3x and figure titled Board connection to isolated AC source STPM34 and STPM33 Added figure titled Board connection to mains ky 14 15 DoclID026226 Rev 2 UM1 748 IMPORTANT NOTICE PLEASE READ CAREFULLY STMicroelectronics NV and its subsidiaries ST reserve the right to make changes corrections enhancements modifications and improvements to 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 Purchasers are solely responsible for the choice selection and use of ST products and ST assumes no liability for application assistance or the design of Purchasers products No licen
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