UG206: Si838xISO-EVB User s Guide This user s guide explains the features of the Si838xISO-EVB, which is designed for the evaluation of the Si838x part family and its recommended bill of materials. KEY POINTS The Si838x product family is a set of eight-channel isolators, rated to 2.5 kVrms, which Discusses kit contents. utilize LED emulator inputs to drive the isolation channel. Various configurations, includ- Provides IEC 61131-2 Recommended Bill ing the number of high speed (2 Mbps) channels and output types (SPI or Parallel), are of Materials. available per the ordering guide in the Si838x data sheet. Demonstrates System-Level Transition Values. The Si838xISO-EVB is populated with an Si8384P and three different input networks, Displays EVB Schematic and Layout. each representing a recommendation derived from the respective IEC 61131-2 digital input types at 24 V dc. Demonstrates Timing Characteristics. The Si838xISO-EVB allows designers to quickly evaluate the Si8384P s functionality and capabilities by driving either 24V digital logic signals into the test-points labeledEX or 2V signals into the remaining test-points. For more Si838x information, visit the Silicon Labs web site at www.silabs.com. The product data sheet and application notes should be referenced to facilitate designs. Si838xISO-EVB Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 1 Rev. 0.2 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice July 26, 2021 1UG206: Si838xISO-EVB User s Guide Si838x as a PLC Digital Input Module 1. Si838x as a PLC Digital Input Module The Si838xISO-EVB is populated with a Si8384P unit, providing 8 parallel outputs, 4 channels which are high-speed and 4 channels which are low-speed. Further, the EVB combines the Si838x LED emulator inputs with two-resistor input networks to form PLC digital input modules per IEC 61131-2, as illustrated in the figure below. The Si838xISO-EVB has 2 channels configured for both Type-1 and Type-2, and 4 channels configured for Type-3. For more information on how to select an input network based on system constraints, view Application Note 970: Si838x Design Guide. PLC Digital Input Module PLC Field Si838xP uController VDD VDD VIN IIN Sensor Or Switch R2 High-side 24V DC VD Resistor AHx BHx Input Current Input Output R3 Limit Resistor C1 Field 2.2nF R1 Status Lamp ID Potential High Speed LED D2 Channels Only Low-side Resistor COM GND GND Figure 1.1. The Schematic for a Single Si838xP Channel Configured as a PLC Input Module in a 24 V DC System Skyworks Solutions, Inc. Phone 781 376-3000 Fax 781 376-3100 sales skyworksinc.com www.skyworksinc.com 2 Rev. 0.2 Skyworks Proprietary Information Products and Product Information are Subject to Change Without Notice July 26, 2021 2 Isolation Barrier