ST's STPM3x devices are ASSP series products designed for high-precision measurements using Rogowski coils, current transformers or shunt sensor power line systems. The STPM3x provides instantaneous voltage and current waveforms and calculates the root mean square (RMS) of voltage, current, power and energy. STPM3x is a family of mixed-signal IC products that includes an analog and a digital section. The analog section includes up to two programmable gain low noise low offset amplifiers and up to four second-order 24-bit sigma-delta ADCs, two bandgap voltage references and independent temperature compensation, a low dropout regulator and DC buffer. The digital section includes digital filtering, hardwired DSP, DFE connection input, and serial communication interface (UART or SPI). The STPM3x is fully configurable and can be calibrated for single point fast digital systems over the entire current dynamic range. STPM34 main features • Active power accuracy - "0.1% error is 5000:1 dynamic range - "0.5% error exceeds 10,000:1 dynamic range • AC Wami exceeds 50Hz~60 Hz EN50470-X, IEC62053-2X, ANSI 12.2x standard requirements • Reactive power accuracy - "0.1% error exceeds 2000:1 dynamic range • Dual mode apparent energy calculation • Instantaneous and average power consumption • RMS and instantaneous voltage and current • Overpressure detection (depression and expansion) and monitoring • Overcurrent detection and monitoring • UART and SPI serial interface, programmable CRC polynomial check • Programmable LED and interrupt output • Four independent 24-bit second-order sigma-delta ADCs • Two programmable gain chopper stabilized low noise and low offset amplifiers • Bandwidth 3.6k Hz @-3dB • Vcc power supply range 3.3 V ± 10% • Supply current Icc4mA (STPM32) • Input clock frequency 16MHz, XTAL or external source • Dual precision reference: 1.23V with independent programmable (TC), 10ppm / °C (typical) • Internal low dropout regulator, 3V (typical) • QFN package • Operating temperature -40 ° C ~ +85 ° C Figure 1 STPM34 block diagram Pvc Switch Box,Electrical Switch Box,Pvc Modular Switch Box,Electrical Pvc Switch Boxes FOSHAN SHUNDE LANGLI HARDWARE ELECTRICAL CO.LTD , https://www.langliplastic.com