STPMS2 Smart sensor II dual-channel 1-bit, 4 MHz, second-order sigma- delta modulator with embedded PGLNA Datasheet - production data Description 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 Features processor designed for energy measurement. VCC supply range 3.2 V to 5.5 V This device can be used in medium and high Two second-order sigma-delta () resolution measurement applications where modulators single or double inputs must be monitored at the Programmable chopper-stabilized low noise same time. The STPMS2 is a mixed signal IC and low offset amplifier consisting of an analog and digital section. The Supports 50-60 Hz, EN 50470-1, EN 50470- analog section consists of a programmable gain, 3, IEC 62053-21, IEC 62053-22 and IEC low noise chopper amplifier, two second-order 62053- 23 standard specs for class 1, class modulator blocks, a bandgap voltage reference, a 0.5 and class 0.2 AC watt meters low drop voltage regulator and DC buffers, while STPMS2L-PUR: less than 0.5% error over the digital section consists of a clock generator 1:5000 range and output multiplexer. Precision voltage reference: 1.23 V with Table 1: Device summary programmable TC Oder code Package Packing Internal low drop regulator 3 V (typ.) 4500 STPMS2L-PUR QFN16 (4x4 mm) pieces per Applications reel Power metering Motor control Industrial process control Weight scales Pressure transducers March 2016 DocID16525 Rev 5 1/36 www.st.com This is information on a product in full production. Contents STPMS2 Contents 1 Introduction ..................................................................................... 5 2 Internal block diagram .................................................................... 6 3 Pin configuration ............................................................................. 7 4 Maximum ratings ............................................................................. 8 5 Electrical characteristics ................................................................ 9 6 Applications ................................................................................... 13 7 Terminology ................................................................................... 16 7.1 Conventions .................................................................................... 16 7.2 Notations ......................................................................................... 16 8 Typical performance characteristics ........................................... 17 9 Theory of operation ....................................................................... 19 9.1 General operation description ......................................................... 19 9.2 Functional description of the analog part ........................................ 19 9.3 Functional description of the digital part .......................................... 22 9.3.1 Decoder for different modes of operations ....................................... 23 9.3.2 Generator for clock frequency .......................................................... 23 9.4 Hard mode ...................................................................................... 24 9.5 Soft mode ........................................................................................ 25 9.5.1 Writing to the configuration register in soft mode ............................. 30 10 Package information ..................................................................... 32 10.1 QFN16 (4x4 mm) package information ........................................... 33 11 Revision history ............................................................................ 35 2/36 DocID16525 Rev 5