Galvanisk isolering af digitale signaler

Würth Elektronik udvider programmet af digitale isolatorer med 2-kanals bi-direktionelle isolatorer til I²C kommunikation (in english).

Würth Elektronik is expanding its range of digital isolators (WPME-CDIS & WPME-CDIP) with 2-channel bidirectional isolators for I²C communication interfaces. WPME-CDI2C enables bidirectional data transmission at up to 2 MHz, making the isolator suitable for most I²C communication applications. The SOIC-8NB package is pin-compatible with common standard I²C isolators on the market.

I²C is a standard interface for internal communication between different circuits. It is used in IoT and consumer electronics (sensors, displays), industrial automation (sensor networks, monitoring systems, motor controls), and the automotive industry (battery and engine management systems, sensors). Many of Würth Elektronik’s sensors also support I²C communication.

Securing interfaces

Isolators are important in all these applications to provide galvanic isolation of digital signals, prevent data communication errors or data corruption, eliminate potential differences, and improve immunity. Voltage protection for people and sensitive circuitry is also crucial. The I²C interface requires bidirectional data transmission, which the isolators must also support.

Inner values

The WPME-CDI2C isolator - designed for bidirectional I²C interface applications with data rates of up to 2 MHz - offers an isolation voltage of up to 3750 VRMS in accordance with UL 1577 and a basic insulation rating in accordance with IEC 60747-17 (VDE 0884-17). It offers high immunity to system noise, with a common-mode transient immunity (CMTI) of ±150 kV/µs.

The device is available from stock in two variants: One features a bidirectional serial data line (SDA) and a bidirectional serial clock line (SCL). The other features a bidirectional serial data line (SDA) and a unidirectional serial clock line (SCL).