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

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.

Key Features

  • VCC supply 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

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Technical Documentation

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

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ST products and solutions for solar energy 5.1 2 MB

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Smart grid distribution and smart meters - Energy-efficient solutions 2.0 1 MB

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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
STPMS1BPQR VFQFPN 16 3x3x0.9 Tape And Reel - - - Active 1.135 1000 NEC EAR99 MALAYSIA MORE INFO No availability reported, please contact our Sales office

(*) 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**
STPMS1BPQR ActiveVFQFPN 16 3x3x0.9IndustrialEcopack2

(**) 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.