PRODUCTS & TECHNOLOGY
Small Isolated Digital I/O Signal Conditioning Boards
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Two new isolated digital signal conditioning and termination boards for OEM embedded computer system designers are aimed at applications requiring signal isolation between a computer and its monitoring/control points. The ISM-TRM-RELAY has 16 independent, Single Pole Double Throw (SPDT) relays. The ISM-TRM-COMBO (pictured) provides a combination of eight optically isolated inputs, eight optically isolated outputs, and eight Form C relays on one board. To ensure reliable connection with easy removal and insertion with field wiring, industry-standard, 3.5 mm pluggable connectors are used.
The ISM-TRM-RELAY has 16 independent Form C relays on board. There are two signal lines, Normally Open (NO) and Normally Closed (NC) plus a Common associated for each relay. The contacts can handle 6A @ 250 VAC / 24 VDC for applications requiring medium current capacity plus isolation.
The ISM-TRM-COMBO offers three different signal conditioning circuits for maximum configuration flexibility. There are eight isolated inputs that have the capability to support either an active high or active low signal from 5 to 30 volts. Every input line is optically isolated from the others and from the computer interface circuits with an isolation voltage rating that exceeds 2500V. Then each input line is wired to a contact bounce eliminator to remove extraneous level changes that result when interfacing with mechanical contacts such as switches or relays.
There are eight isolated outputs for applications requiring medium current capacity. Each output 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. The isolation voltage rating exceeds 2500V. The ISM-TRM-COMBO also has eight independent SPDT Form C relays that can handle 6A @ 250 VAC / 24 VDC for applications requiring medium current capacity plus isolation. Both modules are RoHS-compliant and can operate over an industrial temperature range of -40° to +85°C.Special configurations can be populated for OEM applications. Quantity one pricing for the ISM-TRM-RELAY is $299 and for the ISM-TRM-COMBO $255.