STPM32, STPM33, STPM34 ASSP for metering applications with up to four independent 24-bit nd 2 order sigma-delta ADCs, 4 MHz OSF and 2 embedded PGLNA Datasheet - production data Twin precision voltage reference: 1.18 V with independent programmable TC, 30 ppm/C typ. Internal low drop regulator at 3 V (typ.) QFN packages QFN24L 4x4x1 QFN32L 5x5x1 Operating temperature from -40 C to +105 C Description Features The STPM3x is an ASSP family designed for high accuracy measurement of power and energies in Active power accuracy: power line systems using the Rogowski coil, < 0.1% error over 5000: 1 dynamic range current transformer or shunt current sensors. The < 0.5% error over 10000: 1 dynamic range STPM3x provides instantaneous voltage and Exceeds 50-60 Hz EN 50470-x, IEC 62053-2x, current waveforms and calculates RMS values of ANSI12.2x standard requirements for AC watt voltage and currents, active, reactive and meters apparent power and energies. The STPM3x is a mixed signal IC family consisting of an analog and Reactive power accuracy: a digital section. The analog section consists of < 0.1% error over 2000:1 dynamic range up to two programmable gain low-noise low-offset Dual mode apparent energy calculation nd amplifiers and up to four 2 order 24-bit sigma- Instantaneous and averaged power delta ADCs, two bandgap voltage references with independent temperature compensation, a low RMS and instantaneous voltage and current drop voltage regulator and DC buffers. The digital Under and overvoltage detection (sag and section consists of digital filtering stage, a swell) and monitoring hardwired DSP, DFE to the input and a serial Overcurrent detection and monitoring communication interface (UART or SPI). The STPM3x is fully configurable and allows a fast UART and SPI serial interface with digital system calibration in a single point over the programmable CRC polynomial verification entire current dynamic range. Programmable LED and interrupt outputs nd Four independent 24-bit 2 order sigma-delta Table 1. Device summary ADCs Order code Package Packing Two programmable gain chopper stabilized STPM34TR QFN32L 5x5x1 Tape and reel low-noise and low-offset amplifiers STPM33TR QFN32L 5x5x1 Tape and reel Bandwidth 3.6 kHz at -3 dB STPM32TR QFN24L 4x4x1 Tape and reel V supply range 3.3 V 10% cc Supply current I 4.3 mA (STPM32) cc Input clock frequency 16 MHz, Xtal or external source December 2018 DS10272 Rev 8 1/121 This is information on a product in full production. www.st.comContents STPM32, STPM33, STPM34 Contents 1 Schematic diagram 9 2 Pin configuration . 12 3 Absolute maximum ratings 16 4 Electrical characteristics 17 Pin programmability . 23 5 Typical application example 24 6 Terminology . 26 6.1 Conventions . 26 6.2 Measurement error 26 6.3 ADC offset error 26 6.4 Gain error . 26 7 Typical performance characteristics . 27 8 Theory of operation . 30 8.1 General operation description . 30 8.2 Functional description of the analog part . 31 8.2.1 Power management section . 31 8.2.2 Analog front end . 33 8.2.3 Clock generator . 35 8.2.4 Power-on-reset (POR) and enable (EN) 36 8.3 Functional description of the digital part 38 8.3.1 Digital front end (SDSx bits) . 38 8.3.2 Decimation block 38 8.3.3 Filter block . 39 8.3.4 DC cancellation filter . 39 8.3.5 Fundamental component filter 40 8.3.6 Reactive filter . 40 8.4 Functional description of hardwired DSP . 40 2/121 DS10272 Rev 8