The STPM01 is a programmable single-phase energy metering IC. This application note describes the STPM01 external circuits, which include a crystal oscillator, a power supply circuit, a voltage sensing circuit, and two current sensing circuits.
The document provides a detailed guide on designing external circuits for the STPMO01 Programmable, Single-Phase Energy Metering IC. It covers the implementation of active, reactive, and apparent energy measurement circuits using the IC's advanced 0.35um BCD6 technology.
Key sections include designs for primary and secondary current sensing circuits using transformers and shunt modules, anti-aliasing filters, voltage sensing circuits, capacitive power supply circuits with EMC filters, and clock generation methods using RC oscillators, quartz crystals, or external sources.
| Technology | 0.35um BCD6 |
|---|---|
| Measurement Types | active, reactive, and apparent energy |
| Voltage Measurement | RMS, instantaneous, and harmonic |
| Current Measurement | RMS, instantaneous, and harmonic |
The note describes circuits for a crystal oscillator, power supply, voltage sensing, and two current sensing circuits.
The STPMO01 has a primary channel using a current transformer and a secondary channel.
The clock generation can be implemented using an RC oscillator, a quartz crystal, or an external clock source.