August 4, 2016 - Silicon Labs (also known as "core technology") introduced the industry's first high-speed, multi-channel digital isolator designed to meet the needs of programmable logic controllers (PLCs). The new Si838x PLC isolator family offers an unparalleled combination of features: high-speed channels (up to 2Mbps), high channel integration (up to 8 channels per device), bipolar input flexibility, high immunity to interference and 2.5kVRMS safety Isolation level. The Si838x family offers specially constructed solutions for PLC applications including industrial I/O modules, computer numerical control (CNC) machines and servo motor control. In addition, the Si838x isolators are ideal for process automation controllers (PACs) in distributed process control systems.
For all the details on the Silicon Labs Si838x PLC Input Isolator, including product prices, availability, development tools and data sheets, please visit the official website.
PLCs are widely deployed in harsh factory floor environments and must therefore be both reliable and compact. Many PLC designs are up to 128 channels in size and have multiple high speed inputs. Although optocouplers have provided default isolation solutions over the past few decades, they have also created significant challenges for PLC designers. Due to the lack of high speed capability, optocouplers cannot meet high performance PLC applications such as servo motor control. Optocouplers also lack high noise rejection and their performance degrades over time and temperature, which poses a reliability risk in high temperature industrial applications. For the first time, the Si838x family completely overcomes these challenges by providing a flexible, high-speed, multi-channel bipolar isolation solution in a compact QSOP package that provides longer life and performance than optocoupler-based solutions. Higher reliability.
The Silicon Labs Si838x isolators are highly integrated, single-chip devices that provide an 8-channel 24V digital interface. This high level of integration significantly saves bill of materials (BOM) cost and board area for PLC designs. By using a "daisy chaining" connection to 16 Si838x isolators in the system design, developers can create PLCs that support up to 128 channels using a single serial peripheral interface (SPI) on the system's embedded processor. design.
The controller interface can be 8 parallel channels or a 4-wire SPI. Developers can configure SPI for instant programming of noise signal debounce and daisy chaining for high channel density PLC designs. An optional debounce filter can be pre-programmed in a parallel configuration or programmed directly in a serial output configuration.
With Silicon Labs' groundbreaking CMOS-based LED emulator technology, the Si838x isolators feature flexible bipolar input capability, which allows developers to choose between Sinking or Sourcing inputs. The LED emulator input circuit supports up to eight Sinking or Sourcing inputs in a single isolator device, and no power is required on the field side. The output interface of the connected controller supports low power operation of 2.25V.
The Si838x isolators support high 1MHz (2Mbps) speeds, which are necessary for servo motor control applications. This family of isolators also offers optimum noise rejection on high-speed channels (typically 50 kV/μs CMTI) for increased system reliability.
Ross Sabolcik, vice president of power products at Silicon Labs, said: "Silicon Labs' Si838x family addresses many of the unique challenges in PLC design by providing a compact, multi-channel, high-speed digital isolation solution. PLC developers can now easily The optocoupler-based design migrates to the most advanced digital isolation technology that delivers higher performance, greater design flexibility, higher channel density, and long-term reliability."
Si838x PLC Input Isolator Series Features:
· Bipolar input capability, providing flexible design options for sinking or sourcing PLC input types;
· Maximum integration of 8 channels in a single package, saving board area for compact PLC design;
· High-speed 2Mbps channel supports reliable servo motor control;
· High noise immunity (high speed channel, 50kV/μs CMTI) ensures reliable operation;
· Parallel or SPI interface for flexible design options;
· Single SPI port with 16 Si838x daisy chain connection, can support up to 128 channels, saving control I / O pins;
· User-programmable de-bounce capability using SPI;
· 2.25-5.5V VDD range to reduce power consumption for low power controller interfaces;
· Integrated 2.5kVRMS security level isolation;
Price and availability
The Si838x PLC isolators are available now in volume and are available in samples in a compact 20-pin QSOP package. The Si838x series is priced at $1.91 in quantities of 10,000 units. To simplify PLC application development, Silicon Labs also offers the Si838xISO-KIT evaluation kit for $29. To order product samples and development tools, please visit the website: TIon.
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