STPM34:ASSP for metering applications with up to four independent 24-bit 2nd order sigma-delta ADCs, 4 MHz OSF and 2 embedded PGLNA

The STPM3x is an ASSP family designed for high accuracy measurement of power and energies in power line systems using the Rogowski coil, current transformer or shunt current sensors. The STPM3x provides instantaneous voltage and current waveforms and calculates RMS values of voltage and currents, active, reactive and apparent power and energies. The STPM3x is a mixed signal IC family consisting of an analog and a digital section. The analog section consists of up to two programmable gain low-noise low-offset amplifiers and up to four 2nd order 24-bit sigma-delta ADCs, two bandgap voltage references with independent temperature compensation, a low drop voltage regulator and DC buffers. The digital section consists of digital filtering stage, a hardwired DSP, DFE to the input and a serial communication interface (UART or SPI). The STPM3x is fully configurable and allows a fast digital system calibration in a single point over the entire current dynamic range.

Key Features

  • Active power accuracy:
    • <0.1% error over 5000: 1 dynamic range
    • <0.5% error over 10000: 1 dynamic range
  • Exceeds 50-60 Hz EN 50470-x, IEC 62053-2x, ANSI12.2x standard requirements for AC watt meters
  • Reactive power accuracy:
    • <0.1% error over 2000:1 dynamic range
  • Dual mode apparent energy calculation
  • Instantaneous and averaged power
  • RMS and instantaneous voltage and current
  • Under and overvoltage detection (sag and swell) and monitoring
  • Overcurrent detection and monitoring
  • UART and SPI serial interface with programmable CRC polynomial verification
  • Programmable LED and interrupt outputs
  • Four independent 24-bit 2nd order sigma-delta ADCs
  • Two programmable gain chopper stabilized low-noise and low-offset amplifiers
  • Bandwidth 3.6 kHz @ -3 dB
  • Vcc supply range 3.3 V ±10%
  • Supply current Icc 4 mA (STPM32)
  • Input clock frequency 16 MHz, Xtal or external source
  • Twin precision voltage reference: 1.18 V with independent programmable TC, 10 ppm/°C typ.
  • Internal low drop regulator @ 3 V (typ.)
  • QFN packages
  • Operating temperature from -40 °C to +85 °C
Product Specifications
DescriptionVersionSize
DS10272: ASSP for metering applications with up to four independent 24-bit 2nd order sigma-delta ADCs, 4 MHz OSF and 2 embedded PGLNA5.03 MB
Application Notes
DescriptionVersionSize
AN4470: The STPM3x application calibration2.0638 KB
User Manuals
DescriptionVersionSize
UM1748: EVALSTPM34, EVALSTPM33, EVALSTPM32 evaluation board2.0976 KB
UM2066: Getting started with the STPM3x1.01 MB
UM1719: The STPM3x evaluation software1.21 MB
Design Notes & Tips
DescriptionVersionSize
DT0039: Improving measuring accuracy and EFT immunity for STPM3x applications1.01 MB
Presentations
DescriptionVersionSize
STPM32, STPM33, STPM34 Smart Metering ICs1.0825 KB
Flyers
DescriptionVersionSize
STPM32, STPM33, STPM34 - Taking care of every milliwatt10.20161 MB
Evaluation Tool Software
Part NumberManufacturerDescription
STSW-STPM001STSTPM32/33/34 evaluation software
STSW-STPM002STSTM32 firmware for STPM32 access and a basic metrology application
Solution Evaluation Tools
Part NumberManufacturerDescription
EVALSTPM34Dual-phase energy metering evaluation board with 2 current transformers based on the STPM34
EVALSTPM3X-3PHPoly-phase energy metering demonstration board with current transformers based on the STPM33, STPM34 and STM8S903
STEVAL-IPE023V1USB interface tool for STPMxx family of energy meter ICs
Sample & Buy
Part NumberPackagePacking TypeOperating Temperature (°C) (min)Operating Temperature (°C) (max)AutoshutdownUnit Price (US$) *QuantityECCN (EU)ECCN (US)Country of Origin
STPM34TRVFQFPN 32 5x5x1.0Tape And Reel-4085-0.941000NECEAR99PHILIPPINES
Quality & Reliability
Part NumberPackageGradeRoHS Compliance GradeMaterial Declaration**
STPM34TRVFQFPN 32 5x5x1.0IndustrialEcopack2md_42-wspc-vfqfpn-wspc-5x5x1.0-wspc-32l-wspc-pitch-wspc-0.5_yy42-wspc-v862bag.pdf
md_42-wspc-vfqfpn-wspc-5x5x1.0-wspc-32l-wspc-pitch-wspc-0.5_yy42-wspc-v862bag.xml
ASSP for metering applications with up to four independent 24-bit 2nd order sigma-delta ADCs, 4 MHz OSF and 2 embedded PGLNA STPM32
The STPM3x application calibration STPM32
EVALSTPM34, EVALSTPM33, EVALSTPM32 evaluation board EVALSTPM33
Getting started with the STPM3x STPM32
The STPM3x evaluation software EVALSTPM33
Improving measuring accuracy and EFT immunity for STPM3x applications STPM32
The STPM3x evaluation software EVALSTPM33
The STPM3x evaluation software EVALSTPM33
md_42-wspc-vfqfpn-wspc-5x5x1.0-wspc-32l-wspc-pitch-wspc-0.5_yy42-wspc-v862bag.pdf STPM34
md_42-wspc-vfqfpn-wspc-5x5x1.0-wspc-32l-wspc-pitch-wspc-0.5_yy42-wspc-v862bag.xml STPM34