EVALSTPM33 Single-phase energy metering evaluation board with tamper monitoring, CT and shunt current sensor based on the STPM33 Data brief Description The STPM33 energy metering evaluation board is a class 0.2, single-phase meter which includes tamper monitoring, CT and shunt current sensors for power line systems with Vnom = 140 to 300 V(RMS), Inom / Imax = 5/100 A(RMS), flin = 50/60 Hz ± 10% and Tamb = -40 to +85 °C. Measured active/reactive power can be output from two programmable LEDs on the board. The board can be interfaced with a PC running evaluation software through an isolated RS232 port, or through the STEVAL-IPE023V1 USB isolated interface tool for configuration and data reading. Features • 0.2% accuracy single-phase meter with tamper monitoring • Vnom(RMS) = 140 to 300 V, Inom/Imax(RMS) = 5/100 A, flin = 50/60 Hz ± 10% The board also has SPI/UART pins available to interface a microcontroller for application development. • Tamper detection though neutral current monitoring • Connector for USB isolated hardware programmer tool STEVAL-IPE023V1 and PC GUI • RS232 and UART isolated connectors to PC GUI • SPI/UART switch for device peripheral selection • 2 programmable LEDs on board • Digital expansion to external system-on-chip or MCU • 3.3 V power supply: external or through STEVAL-IPE023V1 isolated USB board • IEC61000 standard compliant • RoHS compliant March 2014 DocID026139 Rev 1 For further information contact your local STMicroelectronics sales office. 1/5 www.st.com Schematic diagrams 1 EVALSTPM33 Schematic diagrams Figure 1. RS232/UART circuit schematic 5 4 3 2 1 1 RXD 2 TXD 3 +3.3VDC 4 GND NOTE: always provide supply for both RS232 and UART J2 J1 RS-232 DB9 Vcc 4 3 2 1 9 8 7 6 UART I/O C6 C7 100n 100n 10 11 1 3 4 5 2 6 16 U1 T2IN T1IN R1OUT R2OUT T1OUT T2OUT 12 9 14 7 SW1 RXD TXD SCS Si8621 SW DIP-3 Vcc C1+ C1C2+ C2V+ VVCC 8 7 6 5 R1 10K GND J3 RS-232 enable 15 1 C1 100n C2 100n C3 100n C4 100n R1IN R2IN VDD1 VDD2 A1-in B1-out A2-out B2-in GND1 GND2 2 13 8 1 2 3 4 ALL SWs OFF SELECT SPI AT POWER UP ALL SWs ON SELECT UART AT POWER UP U2 MAX3232/SO C5 100n GALVANIC ISOLATION GIPG25032014DI1530 2/5 DocID026139 Rev 1 EVALSTPM33 Schematic diagrams Figure 2. Metrology circuit schematic 1 R2 2 22K C8 C9 100n 150p Vp1 R14 270K R13 C24 24 23 22 21 20 19 18 17 270K 22n Vp2 R15 470R Enable/RST C23 J9 Vcc 100u 10V J11 Vref 1-2 Vref1 C34 470R 22n R24 270K Do not assemble in case STPM33 R23 270K J10 line2 L1 1500ohm L1 VAC 4626-X002 J8 L2 1500ohm L7 1500ohm L3 Ip1 R17 1K 1500ohm RS1 R16 BKW-M-R0003-5.0 6R C25 R18 In1 0R L4 R20 1K L5 1 L2 T2 1500ohm C33 10n T1 R19 Ip2 C30 R25 270K R26 270K 1 1u Vref2 C29 Vref2 R12 N 100n 100n MISO MOSI SCL SCS SYN VDDD GNDD GNDD-NC NC VCC GNDreg VDDA GNDA VREF2 GNDref VREF1 1 1 C22 9 10 11 12 13 14 15 16 R3 Vcc Vn2 2 CKout/ZCR XTAL2 CKin/XTAL1 U3 LED1 STPM33/34 LED2 INT1 INT2 EN Vn1 J4 3 1 2 3 4 5 6 7 8 16MHz VP1 VN1 IP1 IN1 IN2 IP2 VN2/NC VP2/NC 1M C17 15p Vref1 Ex Y1 R4 100R 3 Ex C16 15p 1 Int1 2 Int2 3 Led2 4 En/Rst 5 Led1 6 Gnd 7 Ckin 8 Ckout/ZCR DC Supply 32 31 30 29 28 27 26 25 DIGITAL I/O 4.7u 2 TXD 100n 1 150p C20 C32 C15 J7 C19 C28 RXD 1 3 5 7 100R 2 4 6 8 Vcc C31 150p J6 100n J5 SPI R11 R5 4.7K 150p 150p C14 10K 1 2 C13 10K C27 150p 10K C26 C12 10K 100n 150p 2 4 6 8 10 R6 4.7K 150p 10n C11 1 NC 2 MOSI 3 Gnd 4 MISO 5 SCS 6 SCL 7 NC 8 SYN 9 NC 10 Vcc C21 C10 R10 150p LED2 R9 C18 DL2 R8 150p LED1 R7 1 3 5 7 9 DL1 SCS 150p Vcc 1K R21 6R 10n In2 VAC 4626-X002 R22 1K 1500ohm L6 1500ohm To assemble in case current sensor is Shunt To assemble in case current sensor is Current Transformer GIPG25032014DI1535 DocID026139 Rev 1 3/5 5 Revision history 2 EVALSTPM33 Revision history Table 1. Document revision history 4/5 Date Revision 31-Mar-2014 1 Changes Initial release. DocID026139 Rev 1 EVALSTPM33 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. 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