PRODUCTS & TECHNOLOGY
Opto-Isolated Digital I/O Signal Conditioning Boards for Small Form Factor Systems
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Two new optically isolated signal conditioning and termination boards for OEM computer system designers are targeted at applications requiring signal isolation between an embedded computer and monitoring points. From WinSystems, ISM-TRM-ISO-IN provides 24 lines of optically isolated and digitally debounced inputs to provide easy connections and signal conditioning from field wiring. The ISM-TRM-ISO-OUT provides 24 lines of optically isolated outputs. To interface with field wiring, the boards use a 3.5 mm pitch, industry-standard, pluggable connectors to ensure reliable connection with easy removal and insertion
Each input pair of the ISM-TRM-ISO-IN has configuration flexibility to support either an active high or active low signal from 5 to 30 volts. Each input line is optically isolated from the others and from the computer interface circuits. The isolation voltage rating between the input and output of the photocoupler device exceeds 2500V. Then each input line is wired to a contact bounce eliminator. Its purpose is the elimination of extraneous level changes that result when interfacing with mechanical contacts such as switches or relays. This circuit removes bounce on both the “make” and “break” of a contact closure. Each output of the ISM-TRM-ISO-OUT has a NPN Darlington transistor pair with an integral clamp diode for switching inductive loads and transient suppression. The collector-emitter voltage can withstand up to 30 volts and each output is capable of sinking 500 mA of current required by most relays.
Both boards measure 3.6 x 3.8 inches (90 x 96 mm) and have the same mounting hole pattern as PC/104 modules. Both boards can be placed on the top or bottom of a PC/104 stack, but it does not have the PC/104 connector and therefore does not pass through power, data, or control signals. These cards will easily work with other embedded computers of different sizes as standalone signal conditioning modules. Both signal conditioning modules are RoHS-compliant and can operate over an industrial temperature range of -40° to +85°C. Quantity one pricing for the ISM-TRM-ISO-IN is $209 and for the ISM-TRM-ISO-OUT is $149.