STPM32TR

Overview

The STPM32TR is an ASSP designed for high-accuracy power and energy measurement in power line systems. It features up to four independent 24-bit 2nd order sigma-delta ADCs with a 4 MHz oversampling frequency and two embedded programmable gain low-noise amplifiers. The device supports current sampling via Rogowski coils, current transformers, or shunt sensors. It calculates active, reactive, and apparent power, RMS values, and instantaneous waveforms. Key electrical parameters include a supply voltage of 3.3 V ± 10%, a supply current of 4.3 mA, and a bandwidth of 3.6 kHz at -3 dB. Active power accuracy is less than 0.1% error over a 5000:1 dynamic range and less than 0.5% over a 10000:1 dynamic range.

Feature Summary

• Provides instantaneous voltage and current waveforms alongside calculated power metrics including active, reactive, and apparent energy.
• Integrates a hardwired DSP and digital filtering stage for fast single-point digital system calibration across the entire current dynamic range.
• Supports serial communication interfaces (UART or SPI) with programmable CRC polynomial verification for data integrity.

Applications

• High-accuracy AC watt meters compliant with EN 50470-x, IEC 62053-2x, and ANSI 12.2x standards.
• Power monitoring systems requiring under/overvoltage detection and overcurrent monitoring.
• Metrology applications utilizing STM32 microcontrollers for firmware-based energy metering development.

Procurement Notes

Verify the specific suffix 'TR' indicates tape and reel packaging configuration when ordering. Confirm that the component matches the STPM32ASSP family specifications for mixed-signal metrology. Ensure compatibility with the required 16 MHz input clock source, which can be provided by a crystal or external signal generator. Check that the QFN package type aligns with your PCB footprint requirements.

Selection Notes

Select this component for applications demanding high precision in power measurement within a compact mixed-signal IC. It is suitable for designs requiring direct interface with various current sensors without external complex conditioning circuits. Consider the 4.3 mA supply current and 3.3 V operating voltage for power budget calculations. The integrated hardwired DSP reduces the processing load on host microcontrollers.

Part Context

The STPM32 belongs to the STPM3x series of ASSPs dedicated to electricity metering. This family is engineered to exceed standard requirements for AC watt meters. The device combines analog front-end capabilities with digital signal processing to deliver precise energy data. It is part of STMicroelectronics' portfolio for smart grid and energy management solutions.

Replacement Considerations

Consult official documentation for confirmed substitute part numbers within the STPM3x family. Verify pinout and functional compatibility before replacing existing components. No public substitute part numbers are explicitly listed in the provided reference material.

FAQ

What types of current sensors does the STPM32 support?

The STPM32 supports current sampling using Rogowski coils, current transformers, or shunt current sensors.

How is the device calibrated?

The STPM32 is fully configurable and allows for fast digital system calibration performed at a single point over the entire current dynamic range.

What is the typical supply current for the STPM32?

The typical supply current (Icc) for the STPM32 is 4.3 mA.