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ISO1211 Fiches technique(PDF) 19 Page - Texas Instruments |
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ISO1211 Fiches technique(HTML) 19 Page - Texas Instruments |
19 / 28 page ISO1211 IN SENSE OUT FGND Host Controller GND1 24 V 0 V VCC1 VCC GND 5 V or 3.3 V or 2.5 V Backplane Supply TVS RSENSE RTHR Copyright © 2017, Texas Instruments Incorporated 19 ISO1211, ISO1212 www.ti.com SLLSEY7 – JUNE 2017 Product Folder Links: ISO1211 ISO1212 Submit Documentation Feedback Copyright © 2017, Texas Instruments Incorporated Typical Application (continued) 8.2.2.2 Surge, ESD and EFT Tests Digital input modules are subject to surge (IEC 61000-4-5), electrostatic discharge or ESD (IEC 61000-4-2) and electrical fast transient or EFT (IEC 61000-4-4) tests. The surge impulse waveform has the highest energy and the widest pulse width, and is therefore the most stringent test of the three. Figure 10 shows the application diagram for Type 1 and 3 systems. For a 1-kVPP surge test between the input terminals and protection earth (PE), a value of 1 kΩ for RTHR and 10 nF for CIN is recommended. Table 3 lists a summary of recommended component values to meet different levels of EMC requirements for Type 1 and 3 systems. A 2-nF capacitor between FGND and PE is assumed. Table 3. Surge, IEC ESD and EFT, Test IEC 61131-2 TYPE RSENSE RTH CIN SURGE IEC ESD IEC EFT LINE TO PE LINE TO LINE LINE TO FGND Type 1 562 3 kΩ 10 nF ±1 kV ±1 kV ±1 kV ±6 kV ±4 kV Type 3 562 1 kΩ 10 nF ±1 kV ±1 kV ±500 kV ±6 kV ±4 kV 330 nF ±1 kV ±1 kV ±1 kV ±6 kV ±4 kV For higher voltage levels of surge tests or for faster systems that cannot use a large value for CIN, TVS diodes or varistors can be used to meet EMC requirements. Type 2 systems that use a smaller value for RTHR may also require TVS diodes or varistors for surge protection. Figure 12 shows an example usage of TVS diodes for surge protection. The recommended components for surge protection are CGA0603MLA-31900E (Varistor, Bourns), SMF36A (TVS, Littelfuse) and GSOT36C (TVS, Vishay). Varistors are less-expensive alternatives to TVS diodes. Figure 12. TVS Diodes Used Instead of a Filtering Capacitor for Surge Protection in Faster Systems 8.2.2.3 Multiplexing the Interface to the Host Controller The ISO121x devices provide an output-enable pin on the controller side (EN). Setting the EN pin to 0 causes the output buffers to be in the high-impedance state. This feature can be used to multiplex the outputs of multiple ISO121x devices on the same host-controller input, reducing the number of pins on the host controller. In the example shown in Figure 13, two sets of 8-channel inputs are multiplexed, reducing the number of input pins required on the controller from 16 to 10. Similarly, if four sets of 8-channel inputs are multiplexed, the number of pins on the controller is reduced from 32 to 12. |
Numéro de pièce similaire - ISO1211 |
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Description similaire - ISO1211 |
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