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Smart sensor Dual channel 1st order ΣΔ modulator with embedded PGA
  • active Active

The STPMS1, also called a smart-sensor device, is an ASSP designed for effective measurement in power line systems utilizing the Rogowski coil, current transformer, or shunt principle. It is used in combination with the STPMC1 programmable poly-phase energy calculator IC, as a building block for single-phase or poly-phase energy meters. The STPMS1 is a mixed signal IC consisting of an analog and a digital section. The analog section consists of a pre-amplifier and two 1storder ΣΔ modulator blocks, band-gap voltage reference, a low-drop voltage regulator, and DC buffers, while the digital section consists of a clock generator and output multiplexer. This device is designed for use in medium resolution measurement applications when single or double inputs must be monitored at the same time.

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Errata Sheet
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Key Features

  • VCCsupply range: 3.2 V - 5.5 V
  • Two 1st order sigma-delta modulators
  • Programmable chopper-stabilized low noise and low offset amplifier
  • Supports 50-60 Hz AC watt meters
  • Internal low-drop regulator at 3 V (typ.)
  • Precision voltage reference: 1.23 V and 30 ppm/°C (typ.)

Circuit Diagram

Design Resources


Technical Documentation

Product Specifications

Description Version Size
DS6545: Dual-channel 1-bit, 2 MHz, 1st order sigma-delta modulator with embedded PGA
2.1 707 KB

Application Notes

Description Version Size
AN3157: STEVAL-IPE010V1 poly-phase demonstration kit for the STPMC1 and STPMS1
1.1 478 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-IPP002V1 IEC 61334-5-1 compliant smart meter system for AMI application based on STM32, ST7570 PLM and STPMC1/STPMS1 chipset

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**
STPMS1BPQRActiveVFQFPN 16 3x3x0.9Tape And Reel_-1.135No availability reported, please contact our Sales officeEcopack2-

(*) 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.