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STPM33

Single Phase Metering ICs
  • active Active

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 2ndorder 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.

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Errata Sheet
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Datasheet

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 2ndorder sigma-delta ADCs
  • Two programmable gain chopper stabilized low-noise and low-offset amplifiers
  • Bandwidth 3.6 kHz @ -3 dB
  • Vcc supply range 3.3 V±10%
  • Supply current Icc 4 mA (STPM32)
  • Input clock frequency 16 MHz, Xtal or external source
  • Twin precision voltage reference: 1.23 V with independent programmable TC, 10 ppm/°C typ.
  • Internal low drop regulator @ 3 V (typ.)
  • QFN packages
  • Operating temperature -40 °C~+85 °C

Design Resources

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Technical Documentation

Product Specifications

Description Version Size
pdf
DS10272: ASSP for metering applications with up to four independent 24-bit 2nd order sigma-delta ADCs, 4 MHz OSF and 2 embedded PGLNA
1.0 3,740 KB

Application Notes

Description Version Size
pdf
AN4470: The STPM3x application calibration
1.1 1,485 KB

User Manual

Description Version Size
pdf
UM1719: The STPM3x evaluation software
1.1 1,324 KB
pdf
UM1748: EVALSTPM34, EVALSTPM33, EVALSTPM32 evaluation board
1.1 1,211 KB

Presentations & Training Material

Presentations

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

Related Tools and Software

Related Tools and Software

Part Number Description
EVALSTPM33 Single-phase with tamper monitoring energy metering demonstration board with CT and shunt based on the STPM33
STEVAL-IPE023V1 USB interface tool for STPMxx family of energy meter ICs
STSW-STPM001 STPM32/33/34 evaluation software

Publications and Collaterals

Flyer

Description Version Size
pdf
STPM32, STPM33, STPM34
730 KB

Sample & Buy

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Part Number Marketing StatusPackagePacking TypeOperating Temperature (min) Operating Temperature (max) AutoshutdownAutomotive GradeOrder From STUnit Price (US$)*
@
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STPM33PreviewVFQFPN 32 5x5x1.0Tray-4085_-No availability reported, please contact our Sales officeEcopack2-
STPM33TRActiveVFQFPN 32 5x5x1.0Tape And Reel-4085_Free Samples.89Distributor reported inventory date: 2014-10-01
Distributor NameRegionStockMin. order
ARROWOrder NowAMERICA30003000
Farnell Element14Order NowEUROPE29701
DIGIKEYOrder NowWORLDWIDE29491
FUTUREOrder NowWORLDWIDE9801
MOUSEROrder NowWORLDWIDE28681
Ecopack2-

(*) 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
(**) The Material Declaration forms available on st.com 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.
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