ASSP for metering applications with up to four independent 24-bit 2nd order sigma-delta ADCs, 4 MHz 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 analog and a digital section. The analog 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). The STPM3x is fully configurable and allows a fast digital system calibration in a single point over the entire current dynamic range.

Key Features

  • Active power accuracy:
    • < 0.1% error over 5000: 1 dynamic range
    • < 0.5% error over 10000: 1 dynamic range
  • Exceeds 50-60 Hz EN 50470-x, IEC 62053-2x, ANSI12.2x standard requirements for AC watt meters
  • Reactive power accuracy:
    • < 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
  • Four independent 24-bit 2nd order sigma-delta ADCs
  • Two programmable gain chopper stabilized low-noise and low-offset amplifiers
  • Bandwidth 3.6 kHz at -3 dB
  • Vcc supply range 3.3 V ± 10%
  • Supply current Icc 4.3 mA (STPM32)
  • Input clock frequency 16 MHz, Xtal or external source
  • 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
  • Operating temperature from 40 °C to +85 °C



Description Version Size
DS10272 DS10272: ASSP for metering applications with up to four independent 24-bit 2nd order sigma-delta ADCs, 4 MHz OSF and 2 embedded PGLNA 7.0 3 MB
Description Version Size
AN4470 AN4470: The STPM3x and the STCOMET application calibration 3.0 757 KB
Description Version Size
UM1748 UM1748: EVALSTPM34, EVALSTPM33, EVALSTPM32 evaluation board 2.0 976 KB
UM2066 UM2066: Getting started with the STPM3x 2.0 1 MB
UM1719 UM1719: The STPM3x evaluation software 1.2 1 MB
Design Notes & Tips
Description Version Size
DT0039 DT0039: Improving measuring accuracy and EFT immunity for STPM3x applications 1.0 1 MB


Description Version Size
STPM32, STPM33, STPM34 Smart Metering ICs 1.0 825 KB


Description Version Size
STPM32, STPM33, STPM34 - Taking care of every milliwatt 10.2016 1 MB


Evaluation Tool Software
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型号 Package Packing Type Operating Temperature (°C) (min) Operating Temperature (°C) (max) Autoshutdown Marketing Status Unit Price (US$) * Quantity ECCN (EU) ECCN (US) Country of Origin More info Order from ST Order from Distributors
STPM32TR QFN-24L Tape And Reel -40 85 - Active 0.84 1000 NEC EAR99 PHILIPPINES MORE INFO 获取样片 Add to cart DISTRIBUTOR AVAILABILITY

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office  or our Distributors


型号 Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
STPM32TR ActiveQFN-24LIndustrialEcopack2 0 0

(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.