{"product_id":"stpm32tr-energy-metering-ic","title":"STPM32TR Single-Phase Energy Metering IC, QFN-24 (Pre-order)","description":"\u003ch2\u003eWhat it is\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eSTPM32\u003c\/strong\u003e is an ST metering chip (\"ASSP\") that does the hard part of energy measurement for you. Give it a voltage signal and a current signal from the mains, and it returns calibrated \u003cstrong\u003eRMS voltage, RMS current, active, reactive and apparent power and energy\u003c\/strong\u003e over SPI or UART. Your microcontroller just reads numbers; it does no DSP and no calibration maths.\u003c\/p\u003e\n\u003cp\u003eThis is the \u003cstrong\u003esingle-phase\u003c\/strong\u003e member of the family: one voltage channel and one current channel. The STPM33 and STPM34 add channels for split-phase and poly-phase systems and come in a larger QFN32 package.\u003c\/p\u003e\n\u003ch2\u003eKey specifications\u003c\/h2\u003e\n\u003ctable\u003e\n\u003cthead\u003e\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003ctd\u003eFunction\u003c\/td\u003e\n\u003ctd\u003eSingle-phase energy metering front end with hardwired DSP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eMeasurement channels\u003c\/td\u003e\n\u003ctd\u003e1 voltage + 1 current (two 24-bit 2nd-order ΣΔ ADCs)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent input amplifier\u003c\/td\u003e\n\u003ctd\u003eProgrammable-gain chopper-stabilised low-noise amplifier (PGLNA)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eActive power accuracy\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 0.1% error over a 5000:1 dynamic range · \u0026lt; 0.5% over 10000:1\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eReactive power accuracy\u003c\/td\u003e\n\u003ctd\u003e\u0026lt; 0.1% error over a 2000:1 dynamic range\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eStandards\u003c\/td\u003e\n\u003ctd\u003eExceeds EN 50470-x, IEC 62053-2x and ANSI12.2x requirements for AC watt meters at 50–60 Hz\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply\u003c\/td\u003e\n\u003ctd\u003e3.3 V ±10%, with internal 3.0 V and 1.2 V low-drop regulators\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage reference\u003c\/td\u003e\n\u003ctd\u003e1.23 V twin precision reference, independently programmable TC, 30 ppm\/°C typ\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eClock\u003c\/td\u003e\n\u003ctd\u003e16 MHz, crystal or external source\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eBandwidth\u003c\/td\u003e\n\u003ctd\u003e3.6 kHz at −3 dB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eInterface\u003c\/td\u003e\n\u003ctd\u003eUART or SPI (selectable), with programmable CRC verification\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOutputs\u003c\/td\u003e\n\u003ctd\u003eProgrammable LED and interrupt outputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage\u003c\/td\u003e\n\u003ctd\u003eQFN24, 4 × 4 × 1 mm, 0.5 mm pitch (tape and reel — the \"TR\" suffix)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating temperature\u003c\/td\u003e\n\u003ctd\u003e−40 °C to +85 °C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ch2\u003eWhat it measures\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eRMS and instantaneous voltage and current\u003c\/li\u003e\n\u003cli\u003eInstantaneous and average active power; fundamental and wideband energy; dual-mode apparent energy\u003c\/li\u003e\n\u003cli\u003eOvervoltage and undervoltage detection\u003c\/li\u003e\n\u003cli\u003eOvercurrent detection with a programmable threshold\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eCurrent sensors it works with\u003c\/h2\u003e\n\u003cp\u003eShunt resistor, current transformer, or Rogowski coil. The programmable gain on the current channel is what lets one chip cover all three.\u003c\/p\u003e\n\u003ch2\u003eDesign notes before you order\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eThis is a QFN-24, 4 × 4 mm, 0.5 mm pitch with a thermal pad.\u003c\/strong\u003e It will not go on a breadboard or in a socket. You need a PCB and reflow, hot air or a good stencil-and-skillet setup.\u003c\/li\u003e\n\u003cli\u003eIt needs a \u003cstrong\u003e16 MHz crystal\u003c\/strong\u003e and a clean 3.3 V rail.\u003c\/li\u003e\n\u003cli\u003eThe current and voltage dividers must be designed for your mains and sensor; accuracy comes from that front end as much as from the chip.\u003c\/li\u003e\n\u003cli\u003eIf you want to try the chip before designing a board, start with the \u003ca href=\"\/products\/evalstpm32-energy-metering-eval-board\"\u003eEVALSTPM32 evaluation board\u003c\/a\u003e, which is a working class 0.2 meter with the shunt and dividers already done.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eTypical uses\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003ePrepaid and smart electricity meters\u003c\/li\u003e\n\u003cli\u003eSubmetering for estates, shops and shared buildings\u003c\/li\u003e\n\u003cli\u003eEnergy logging in inverter, solar and generator systems\u003c\/li\u003e\n\u003cli\u003ePower quality monitoring, including sag and overcurrent detection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eDocuments\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSTPM32\/STPM33\/STPM34 data brief (ST, DocID025358)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003ePre-order: register your interest\u003c\/h2\u003e\n\u003cp\u003eWe do not hold this part in Nigeria yet. We are listing it to find out how many people actually need it before we commit to an order. \u003cstrong\u003eNothing is charged and no order is placed right now.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eLead time once we order is \u003cstrong\u003e2 to 4 weeks\u003c\/strong\u003e from our distributor, plus clearing.\u003c\/p\u003e\n\u003cp\u003eTell us how many you want and we will come back to you with a firm price and date:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eEmail\u003c\/strong\u003e: \u003ca href=\"mailto:rabi@microscale.net?subject=Pre-order%20interest%3A%20STPM32TR\u0026amp;body=Part%3A%20STPM32TR%0AQuantity%20needed%3A%20%0ATarget%20date%3A%20%0AWhat%20you%20are%20building%3A%20\"\u003erabi@microscale.net\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWhatsApp or call\u003c\/strong\u003e: \u003ca href=\"https:\/\/wa.me\/2349016742733\"\u003e+234 901 674 2733\u003c\/a\u003e\n\u003c\/li\u003e\n\u003cli\u003eOr use the \u003ca href=\"\/pages\/contact\"\u003econtact page\u003c\/a\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf enough people ask for it, we stock it. If you need it urgently, say so and we can quote it as a one-off import.\u003c\/p\u003e\n\n\u003cp\u003eSold as a \u003cstrong\u003esingle IC\u003c\/strong\u003e. Our distributor supplies it on tape and reel in multiples of 20, so we order in 20s and hold the balance.\u003c\/p\u003e","brand":"STMicroelectronics","offers":[{"title":"Default Title","offer_id":67658482745619,"sku":null,"price":6500.0,"currency_code":"NGN","in_stock":false}],"url":"https:\/\/www.microscale.net\/products\/stpm32tr-energy-metering-ic","provider":"Microscale","version":"1.0","type":"link"}