data brief for further information contact your local stmicroelectronics sales office. may 2008 rev 1 1/4 4 STEVAL-IFP008V1 demonstration board for the clt3-4b current limited termination features for iec61131-2 type 1 and 3 inputs 4 input channel topology fully integrated internally fixed current limiter optocoupler output drive wide range supply voltage and temperature operation description the clt3-4b is a quadruple logic input termination for sensor or mechanical switch interfaces. it is designed to work in 24 vdc applications such as pl cs (programmable logic controllers), pacs (programmable automation controllers) and distributed i/o systems used in factory automation. the device optimizes the input vi characteristic to reduce its power dissipation. this becomes critical when the application cabinet or housing requires higher protection levels such as ip65 and ip67. these closed cabinets are used in various automated lines including the food and chemical industry. the power dissipated inside the module is very limited as there is usually no air circulation inside the box. the current limitation also reduces the power losses in the sensor. the most important aspect of the clt3-4b is the electrical protection and susceptibility its brings to the application. the clt3-4b implements efficient protection diodes on each input and supply volt- age line. serial resistors ensure a higher level of susceptibility of the entire input module. thanks to its compact tssop20 package clt3- 4b device occupies very little space on the pcb compared to an equivalent discrete solution. STEVAL-IFP008V1 www.st.com
block diagram STEVAL-IFP008V1 2/4 1 block diagram figure 1. schematic v app v app v app v app v app led2 0 ? c1 22 nf 1 2 3 4 5 6 7 8 rn1 330 ? led1 rc 4.7 k ? in1 2 in2 4 in3 7 in4 9 out1 19 out2 17 out3 14 out4 12 com 1 com 10 com 16 com 15 com 11 vc 5 esd12 3 esd34 8 esd_c 6 com12 18 com34 13 com 20 u1 clt3-4bt6 c2 22 nf 0 ? rin1 1.8 k ? 0 ? 1 2 3 4 5 6 j2 output 0 ? 1 2 16 15 3 4 5 6 7 8 14 13 12 11 10 9 u2 tlp281-4 c3 22 nf rin2 1.8 k ? c4 22 nf rin3 1.8 k ? led4 1 2 3 4 5 6 j1 input led3 rin4 1.8 k ? apm0022
STEVAL-IFP008V1 revision history 3/4 2 revision history table 1. document revision history date revision changes 27-may-2008 1 initial release.
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