Smart Switch: Si830x Datasheet

The Si830x provides four high-side or low-side switches with low R_ON. These switches are ideal for driving resistive and inductive loads like solenoids, relays, and lamps commonly found in industrial control systems like Programmable Logic Controllers (PLC).

They are easily interfaced directly to an MCU, or controlled through a digital isolator or optocoupler-based isolation barrier.

The logic interface supports low-power 2.5 V to 5 V MCUs and is powered by the switch's high-voltage field power supply. The field power supply supports a wide supply range, from 9V to 32V, making it ideal for industrial voltage levels. The switches are capable of providing 0.7 A under any valid load condition. An innovative multi-voltage clamp efficiently handles an unlimited amount of demagnetization energy (EAS).

Each switch offers complete fault protection. A unique power estimation based overcurrent protection keeps the device cool and operational, even during a short circuit event. Additionally, the device power supplies are monitored, and the switches are safely constrained or shutdown on faults.

Three diagnostics are reported through an active-low, open-drain fault indicator pin. It can be connected to an LED for instant user feedback, connected to an MCU for advanced software control, or tied together with additional fault pins from other devices to simplify user feedback or reduce board layout complexity.