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Smart sensor II Dual channel 2nd order sigma-delta modulator with embedded PGA
  • active Active

The STPMS2, also called “smart sensor” devices, are ASSPs designed for effective measurement in power line systems utilizing Rogowski coil, current transformer, Hall or shunt sensors. These devices are designed as building blocks for single-phase or multi-phase energy meters along with the STPMC1 device, a digital signal processor designed for energy measurement. This device can be used in medium and high resolution measurement applications where single or double inputs must be monitored at the same time. The STPMS2 are mixed signal ICs consisting of an analog and digital section. The analog section consists of a programmable gain, low noise choppered amplifier, two second-order ΔΣ modulator blocks, a band-gap voltage reference, a low-drop voltage regulator and DC buffers, while the digital section consists of a clock generator and output multiplexer.

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Errata Sheet
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Key Features

  • VCCsupply range 3.2 V - 5.5 V
  • Two second-order sigma-delta (ΣΔ) modulators
  • Programmable chopper-stabilized low noise and low offset amplifier
  • Supports 50-60 Hz, EN 50470-1, EN 50470-3, IEC 62053-21, IEC 62053-22 and IEC 62053-23 standards specs for class 1, class 0.5 and class 0.2 AC watt meters
  • STPM02H: less than 0.5% error over 1:10000 range
  • STPM02L: less than 0.5% error over 1:5000 range
  • Precision voltage reference: 1.23 V with programmable TC (STPMS2L only)
  • Internal low drop regulator @ 3 V (typ.)

Circuit Diagram

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DS6546: Smart sensor II dual-channel 1-bit, 4 MHz, second-order sigma-delta modulator with embedded PGLNA
3.0 2,136 KB

Application Notes

Description Version Size
AN4121: Poly-phase demonstration kit with the STPMC1 and STPMS2
1.0 1,850 KB

Presentations & Training Material


Description Version Size
ST products and solutions for solar energy
5.1 2,135 KB

Related Tools and Software

Related Tools and Software

Part Number Description
STEVAL-IPE014V1 Multiphase energy meter daughterboard based on the STPMS2 smart sensor device

Publications and Collaterals


Description Version Size
Poly-phase chipset for energy measurement
1.0.0 362 KB

Sample & Buy

Part Number Marketing StatusPackagePacking TypeOperating Temperature (min) Operating Temperature (max) AutoshutdownAutomotive GradeOrder From STUnit Price (US$)*
@ 1000
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STPMS2L-PURActiveVFQFPN 16 4x4x1.0Tape And Reel_-1Distributor reported inventory date: 2016-02-06
Distributor NameRegionStockMin. order

(*) 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 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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