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Digital Isolators

SI88643EC-IS is a digital isolator product belonging to the Isopower® family of digital isolators from Silicon Labs. It is a very advanced device which offers high electrical isolation. The device is purpose-built to provide an integrated solution for interfacing two digital communication systems that have different logic and voltage levels.

General Overview

SI88643EC-IS devices are available in multi-chip module (MCM) form factor with four channels. They have a maximum data rate of up to 500 Mbps. They offer up to 5 kV RMS isolation (1 minute) for sensitive signals. It is also an inherently safe device which features a low power consumption mode for energy-saving applications. Typical applications for SI88643EC-IS include industrial Ethernet and fieldbus applications such as CAN bus, ProfiNet, ProfiBus, or EtherNet/IP.

Technical Features

• Supports 4 channels
• Achieves data rate up to 500 Mbps
• High side common modes up to 18V
• High transient voltage isolation 5kV RMS (1 minute)
• Over-temperature protection
• Over-current protection for each channel
• Adaptive power supply voltage (3.3V to 5.5V)
• Low power consumption in shutdown mode

Working Principle

The SI88643EC-IS employs a high-performance digital isolator component core which is based on proprietary Silicon Labs’ patented transformers. This provides electrical insulation and signal transmission across two separate circuits. The transfer of signal is made possible by a pair of transformers which are coupled by a magnetic field.

The signal opposite winding retrieves the energy conversationally from the source side and generates a copy of it in the isolated side. The isolated side conveniently drives all the inputs and outputs and provides a high level of protection from corrosive noise, power-line transients, and other environmental disturbances.

Application Fields

The SI88643EC-IS digital isolator is excellent for use in safety critical industrial applications. It is perfectly suited for use in any application which requires data to be transmitted at high speeds over long distances. Typical applications for SI88643EC-IS include industrial Ethernet and fieldbus applications such as CAN bus, ProfiNet, ProfiBus, or EtherNet/IP.

These digital isolators are also well suited to any application which needs to identify, isolate, or provide immunity from noise interference. Such applications include power transmission, automotive systems, medical systems, industrial and HVAC systems, and communication systems.

Conclusion

SI88643EC-IS digital isolators from Silicon Labs are versatile and reliable devices. They provide high electrical isolation for sensitive signals, and they are used in many industrial and communication applications. They offer up to 5 kV RMS isolation, and they support up to four channels with a maximum data rate of 500 Mbps.

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