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Isolated 24V digital inputs ISO1211 and ISO1212

01.09.2017

Texas Instruments presented ISO1211 and ISO1212 - specialized integrated circuits for the implementation of 24 V discrete inputs (according to IEC 61131-2 type 1, 2 and 3 GOST 61131-2) with individual galvanic isolation. With ISO1211 it is possible to implement a compact isolated digital input with protection on a single chip, and with ISO1212 two galvanically isolated digital inputs on one chip at once.

Traditionally, discrete inputs are built on passive components, and as a decoupling, as a rule, an optocoupler is used. This approach is quite simple and has a low cost, but it has a number of disadvantages: the large size of the entire solution, rather high power dissipation, and low response speed.

Using ISO1211 or ISO1212 minimizes these disadvantages and allows you to build a low-power small-sized channel with speeds up to 4 Mbps. This is especially true when it comes to the development of a small industrial logic controller (PLC).

To operate ISO1211 and ISO1212, it is not required to use a galvanically isolated DC / DC converter, it is enough to supply power from the digital part within 2,25V ... 5,5V. Microcircuits have built-in protection against polarity reversal and overvoltage in the range of +-60V. The galvanic barrier has an isolation value of 2,5kV rms for one minute (UL 1577).

ISO1211 - made in the SOIC8 package (4.90 mm x 3.91 mm), ISO1212 - in the SSOP16 package (4.90 mm x 3.90 mm).

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