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STMicro quad termination module operates to 35V

Posted: 14 Nov 2002 ?? ?Print Version ?Bookmark and Share

Keywords:stmicroelectronics? clt3 4bt6? quad termination module?

STMicroelectronics CLT3-4BT6 quad termination module for PLC digital inputs has four over-protected and current limited channels operating from 11V to 35V and guaranteed robust behavior from -30V to 35V. The module also provides compact protection for 24Vdc industrial automation applications.

Major application areas for the TSSOP20 device include termination for inputs designed to the IEC61131-2 type 1 standard and for the logic interfaces of EN60947-5-2 proximity sensors. The termination will also be useful in the I/O modules of industrial automation modules including PLCs, distributed I/O peripherals, field bus nodes, and machine tool interfaces.

Each channel consists of input protection, a serial current-limiting circuit, and an optocoupler driver. The current-limiting circuit, connected between the input and the output pins, is compensated across the operating temperature range. It is claimed by the company to be accurate across the 2.1mA to 3.7mA range and requires an activation voltage below 5V.

The output section of each termination controls the operation of an optocoupler. When the input current is <1.5mA, this output circuit diverts all the input current and keeps the optocoupler turned off. When the input voltage is higher than 11V with a 1.2 kiloohms input resistor, the optocoupler turns on.

Maximum dissipation of the termination module is 95mW per input, and it is insensitive to sensor impedance, and voltage and temperature variations.

The CLT3-4BT6 is specified for operation over the -25C to 85C temperature range.

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