Overview
The STPM32TR from STMicroelectronics is an Application-Specific Standard Product (ASSP) designed for high accuracy measurement of power and energies in power line systems. This IC is part of the STPM3x family, which is tailored for use with Rogowski coils, current transformers, or shunt current sensors. The STPM32TR provides instantaneous voltage and current waveforms and calculates RMS values of voltage and currents, active, reactive, and apparent power, and energies. It consists of both analog and digital sections, enabling comprehensive power measurement and analysis.
Key Specifications
| Specification | Details |
|---|---|
| ADCs | Up to four independent 24-bit 2nd order sigma-delta ADCs |
| Amplifiers | Two programmable gain chopper stabilized low-noise and low-offset amplifiers |
| Supply Voltage | 3.3 V ± 10% |
| Supply Current | 4.3 mA (typ.) |
| Input Clock Frequency | 16 MHz, Xtal or external source |
| Voltage References | Twin precision voltage reference: 1.18 V with independent programmable TC, 30 ppm/°C typ. |
| Internal Regulator | Internal low drop regulator at 3 V (typ.) |
| Bandwidth | 3.6 kHz at -3 dB |
| Operating Temperature | -40 °C to +105 °C |
| Package | QFN-24L |
| Serial Interface | UART and SPI with programmable CRC polynomial verification |
Key Features
- Active power accuracy: < 0.1% error over 5000:1 dynamic range, < 0.5% error over 10000:1 dynamic range
- 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
- Programmable LED and interrupt outputs
- UART and SPI serial interface with programmable CRC polynomial verification
Applications
The STPM32TR is primarily used in smart metering systems and other applications requiring high accuracy power measurement. It is suitable for single-phase energy metering and can be integrated into various smart grid and industrial automation systems. The IC supports the design of smart meters and is compliant with standards such as EN 50470-x, IEC 62053-2x, and ANSI 12.2x for AC watt meters.
Q & A
- What is the primary function of the STPM32TR?
The STPM32TR is designed for high accuracy measurement of power and energies in power line systems. - What types of sensors can the STPM32TR work with?
The STPM32TR can work with Rogowski coils, current transformers, or shunt current sensors. - What is the accuracy of active power measurement?
The active power accuracy is less than 0.1% over a 5000:1 dynamic range and less than 0.5% over a 10000:1 dynamic range. - What serial interfaces are supported by the STPM32TR?
The STPM32TR supports both UART and SPI serial interfaces with programmable CRC polynomial verification. - What is the operating temperature range of the STPM32TR?
The operating temperature range is from -40 °C to +105 °C. - What package type is the STPM32TR available in?
The STPM32TR is available in a QFN-24L package. - Does the STPM32TR have built-in voltage references?
Yes, it has twin precision voltage references with independent programmable temperature compensation. - Is the STPM32TR compliant with any specific standards?
Yes, it exceeds the requirements of EN 50470-x, IEC 62053-2x, and ANSI 12.2x standards for AC watt meters. - What is the typical supply current of the STPM32TR?
The typical supply current is 4.3 mA. - Does the STPM32TR support overvoltage and overcurrent detection?
Yes, it supports under and overvoltage detection (sag and swell) and overcurrent detection and monitoring.
