EVALSTPM32 STMicroelectronics

EVALSTPM32 Single-phase energy metering evaluation board with shunt current sensor based on the STPM32 Data brief Description The STPM32 energy metering evaluation board is a class 0.2, single-phase meter with shunt current sensor for power line systems with V = 140 to nom 300 V , I / I = 5/100 A , f = 50/60 (RMS) nom max (RMS) lin Hz 10% and T = -40 to +85 C. amb 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 The board also has SPI/UART pins available to interface a microcontroller for application 0.2% accuracy single-phase meter development. V (RMS) = 140 to 300 V, I /I = nom nom max(RMS) 5/100 A, f = 50/60 Hz 10% lin 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 DocID026138 Rev 1 1/5 For further information contact your local STMicroelectronics sales office. www.st.comSchematic diagrams EVALSTPM32 1 Schematic diagrams Figure 1. RS232/UART circuit schematic 1 RXD 2 TXD 3 +3.3VDC 4 GND NOTE: always provide supply for both RS232 and UART J2 J1 RS-232 DB9 UART I/O Vcc C6 C7 100n 100n ALL SWs OFF SELECT SPI AT POWER UP ALL SWs ON SELECT UART AT POWER UP U2 1 8 SW1 VDD1 VDD2 2 7 RXD A1-in B1-out 13 12 3 6 TXD R1IN R1OUT A2-out B2-in 8 9 4 5 SCS R2IN R2OUT GND1 GND2 U1 10 14 Si8621 T2IN T1OUT SW DIP-3 11 7 R1 T1IN T2OUT 1 Vcc C1 10K C1+ 100n 3 C1- 4 C2 C2+ 100n 5 C2- 2 C3 V+ 6 100n V- C4 J3 16 15 100n RS-232 enable VCC GND MAX3232/SO C5 100n GALVANIC ISOLATION GIPG25032014DI1545 2/5 DocID026138 Rev 1 1 6 2 7 3 8 4 9 5 4 1 2 3 2 1