Overview
The STPM33TR, produced by STMicroelectronics, is part of the STPM3x family of Application-Specific Standard Products (ASSPs) designed for high accuracy measurement of power and energies in power line systems. This IC family is optimized for use with Rogowski coils, current transformers, or shunt current sensors. The STPM33TR provides instantaneous voltage and current waveforms and calculates RMS values of voltage and currents, as well as active, reactive, and apparent power and energies. It consists of both analog and digital sections, enabling comprehensive power measurement and analysis.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Active Power Accuracy | < 0.1% over 5000:1 dynamic range, < 0.5% over 10000:1 dynamic range | % |
| Reactive Power Accuracy | < 0.1% over 2000:1 dynamic range | % |
| ADCs | Four independent 24-bit 2nd order sigma-delta ADCs | |
| Amplifiers | Two programmable gain chopper stabilized low-noise and low-offset amplifiers | |
| Bandwidth | 3.6 kHz at -3 dB | kHz |
| Vcc Supply Range | 3.3 V ± 10% | V |
| Supply Current (Icc) | 5.0 mA (typical for STPM33) | mA |
| Input Clock Frequency | 16 MHz, Xtal or external source | MHz |
| Voltage Reference | 1.18 V with independent programmable TC, 30 ppm/°C typ. | V |
| Operating Temperature | -40 °C to +105 °C | °C |
| Package | VFQFPN 32 5x5x1.0 mm |
Key Features
- Instantaneous and averaged power calculations
- RMS and instantaneous voltage and current measurements
- 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
- Dual mode apparent energy calculation
- Exceeds 50-60 Hz EN 50470-x, IEC 62053-2x, ANSI12.2x standard requirements for AC watt meters
- Internal low drop regulator at 3 V (typ.)
- Twin precision voltage reference with independent programmable temperature compensation
Applications
The STPM33TR is primarily used in smart metering systems and smart grid applications. It is suitable for single-phase and multi-phase energy meters, as well as other power line monitoring and measurement devices. The IC supports various current sensing methods, including Rogowski coils, current transformers, and shunt current sensors, making it versatile for different application scenarios.
- Smart meters
- Smart grid applications
- Single-phase and multi-phase energy meters
- Power line monitoring and measurement devices
Q & A
- What is the primary function of the STPM33TR?
The STPM33TR is designed for high accuracy measurement of power and energies in power line systems, providing instantaneous voltage and current waveforms and calculating various power metrics.
- What types of current sensors can be used with the STPM33TR?
The STPM33TR supports Rogowski coils, current transformers, and shunt current sensors.
- What is the accuracy of active power measurement for the STPM33TR?
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.
- Does the STPM33TR support serial communication interfaces?
- What is the operating temperature range of the STPM33TR?
The operating temperature range is from -40 °C to +105 °C.
- What package type is the STPM33TR available in?
The STPM33TR is available in a VFQFPN 32 5x5x1.0 mm package.
- Does the STPM33TR have built-in voltage references?
- Can the STPM33TR detect under and overvoltage conditions?
- Is the STPM33TR compliant with industry standards for AC watt meters?
- What is the typical supply current for the STPM33TR?
The typical supply current (Icc) for the STPM33 is 5.0 mA.
