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

The STPMS2 also called “smart sensor” device, is an ASSP designed for effective measurement in power line systems utilizing the Rogowski coil, current transformer and Hall or shunt sensors. This device is designed as a building block 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 is a mixed signal IC consisting of an analog and digital section. The analog section consists of a programmable gain, low noise chopper amplifier, two second-order ΔΣ modulator blocks, a bandgap voltage reference, a low drop voltage regulator and DC buffers, while the digital section consists of a clock generator and output multiplexer.

Key Features

  • VCC supply range 3.2 V to 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 standard specs for class 1, class 0.5 and class 0.2 AC watt meters
  • STPMS2L-PUR: less than 0.5% error over 1:5000 range
  • Precision voltage reference: 1.23 V with programmable TC
  • Internal low drop regulator @ 3 V (typ.)

Circuit Diagram

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Technical Documentation

Product Specifications
Description Version Size
DS6546 DS6546: Smart sensor II dual-channel 1-bit, 4 MHz, second-order sigma-delta modulator with embedded PGLNA 5.0 1 MB
Application Notes
Description Version Size
AN4121 AN4121: Poly-phase demonstration kit with the STPMC1 and STPMS2 1.0 1 MB

Presentations & Training Material

Description Version Size
ST products and solutions for solar energy 5.1 2 MB

Publications and Collaterals

Description Version Size
Poly-phase chipset for energy measurement 1.0 361 KB
Description Version Size
Smart grid distribution and smart meters - Energy-efficient solutions 2.0 1 MB

Tools and Software

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Sample & Buy

Part Number 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
STPMS2L-PUR VFQFPN 16 4x4x1.0 Tape And Reel - - - Active 1 1000 NEC EAR99 MALAYSIA MORE INFO

(*) 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

Quality & Reliability

Part Number Marketing Status Package Grade RoHS Compliance Grade Material Declaration**
STPMS2L-PUR ActiveVFQFPN 16 4x4x1.0IndustrialEcopack2

(**) 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.