SI8718BC-A-IPR

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Digital Isolators, which are application device based on integrated circuit and largely utilized for electric isolations between systems, provide superior performance as well as cost efficiency. In this article, we will discuss the application field and working principle of SI8718BC-A-IPR, a digital isolator product of Silicon Laboratories, Inc., which provides about 1,000 V/us common mode transient immunity and >50 KV/us isolation.

Applications of the SI8718BC-A-IPR digital isolator mainly include protection systems, such as communication and home automation systems, industrial automation systems, professional/consumer audio/video systems, as well as medical, dental, and automotive systems. It can also be used as a digital signal isolator in various dry contact devices.

The working principle of SI8718BC-A-IPR is based on a proprietary Silicon Laboratories patented isolation technology to provide bidirectional data signal and power isolation. It consists of a data signal line receiver, dual line drivers, a galvanic isolator, and a control interface. The galvanic isolator is implemented using an opto-coupler with integrated logic gate, and the control interface is an I2C compatible interface, providing user the option of controlling all options of the digital isolator.

The receiver part of the digital isolator consists of a phototransistor opto-coupler and a multi-channel differential comparator. The signals received from the transmitter are compared against a reference voltage set by the control interface. The output signal from the receiver is looped back to the control interface, allowing it to calibrate the receiver performance.

The dual-line drivers are based on a single-channel photodiode opto-coupler, using an internal pre-amplifier circuit, and two independent comparators, allowing comparator threshold to be adjusted. The outputs from the drivers then go through the isolator for further isolation purposes.

The SI8718BC-A-IPR digital isolator has high-voltage protection, ESD protection, and integrated power-on reset circuit (PORS), which provides ±8 kV ESD protection as per IEC 61000-4-2 contact and air discharges. It also has programmable hysteresis and rise and fall time inputs, allowing the user to adjust the signal levels for optimum performance in specific applications.

Moreover, the digital isolator features a wide common-mode transient immunity range of 1000 V/us as well as >50 KV/us isolation. It has a wide operating temperature range of -40°C to 105°C, and comes in a wide range of packages. It is also compliant with UL 94-V0 flammability rating. The digital isolator requires only 2mA quiescent current at 3.3V to operate.

Overall, SI8718BC-A-IPR digital isolator is an ideal choice for system applications that require high voltage isolation, robust protection, and wide common-mode transient immunity. It provides users with convenient and cost-effective solutions for electric isolation in various systems.

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