STEVAL-IFP008V1 Demonstration board for the CLT3-4B current limited termination Data Brief 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 STEVAL-IFP008V1 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 PLCs (programmable logic controllers), PACs (programmable automation controllers) and distributed I/O systems used in factory automation. 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 voltage line. Serial resistors ensure a higher level of susceptibility of the entire input module. 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. Thanks to its compact TSSOP20 package CLT34B device occupies very little space on the PCB compared to an equivalent discrete solution. 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. May 2008 Rev 1 For further information contact your local STMicroelectronics sales office. 1/4 www.st.com 4 2/4 4 6 5 2 Rin4 1.8 kΩ Rin3 1.8 kΩ Rin2 1.8 kΩ Rin1 1.8 kΩ 4.7 kΩ C2 22 nF C1 22 nF C3 22 nF C4 22 nF 1 10 3 8 6 9 7 4 2 5 COM COM COM COM COM12 COM34 OUT4 OUT3 OUT2 OUT1 CLT3-4BT6 COM COM ESD12 ESD34 ESD_C IN4 IN3 IN2 IN1 VC U1 20 16 15 11 18 13 12 14 17 19 0Ω 0Ω 0Ω 0Ω 9 8 5 6 7 8 4 3 2 1 VAPP VAPP VAPP VAPP RN1 330 Ω VAPP LED4 LED3 LED2 LED1 10 7 11 6 13 14 15 16 12 TLP281-4 U2 5 4 3 2 1 APM0022 OUTPUT 4 6 5 2 1 3 J2 Figure 1. 1 3 Rc 1 INPUT J1 Block diagram STEVAL-IFP008V1 Block diagram Schematic STEVAL-IFP008V1 2 Revision history Revision history Table 1. Document revision history Date Revision 27-May-2008 1 Changes Initial release. 3/4 STEVAL-IFP008V1 Please Read Carefully: Information in this document is provided solely in connection with ST products. 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