STPM32TR

STPM32TR is an ASSP IC for metering applications with up to four independent 24-bit 2nd order sigma-delta ADCs, 4MHz OSF and 2 embedded PGLNA. The STPM3x is an ASSP family designed for high accuracy measurement of power and energies in power line systems using the Rogowski coil, current transformer or shunt current sensors. The STPM3x provides instantaneous voltage and current waveforms and calculates RMS values of voltage and currents, active, reactive and apparent power and energies. The STPM3x is a mixed signal IC family consisting of an analogue and a digital section. The analogue section consists of up to two programmable gain low-noise low-offset amplifiers and up to four 2nd order 24-bit sigma-delta ADCs, two bandgap voltage references with independent temperature compensation, a low drop voltage regulator and DC buffers. The digital section consists of digital filtering stage, a hardwired DSP, DFE to the input and a serial communication interface (UART or SPI).

• Exceeds 50-60 Hz EN 50470-x, IEC 62053-2x, ANSI12.2x standard requirements for AC watt meters
• Reactive power accuracy is <lt/> 0.1% error over 2000 : 1 dynamic range
• Dual mode apparent energy calculation
• Instantaneous and averaged power, RMS and instantaneous voltage and current
• Under and overvoltage detection (sag and swell) and monitoring
• Overcurrent detection and monitoring
• UART and SPI serial interface with programmable CRC polynomial verification
• Programmable LED and interrupt outputs
• Bandwidth of 3.6KHz at -3dB, Vcc supply range of 3.3V ±10%, supply current Icc of 4.3mA
• Twin precision voltage reference: 1.18V with independent programmable TC, 30ppm/°C typ

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