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HCPL4100 Scheda tecnica(PDF) 11 Page - Agilent(Hewlett-Packard) |
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HCPL4100 Scheda tecnica(HTML) 11 Page - Agilent(Hewlett-Packard) |
11 / 12 page 11 As Figure 15 illustrates, the combination of Agilent current loop optocouplers, HCPL-4100 transmitter and HCPL-4200 receiver, can be used at the isolated end of current loops. Cross talk and common mode coupling are greatly reduced when optical isolation is imple- mented at the same end of both loops, as shown. Full duplex data rate is limited by the non-isolated active transmitter current loop. Comments mentioned under simplex configuration apply to the full duplex case. Consult the HCPL-4200 receiver optocoupler data sheet for specified device performance. Half Duplex The half duplex configuration, whether point to point or multi- drop, gives non-simultaneous bidirectional data flow from transmitters to transmitters shown in Figures 16a and 16b. This configuration allows the use of two wires to carry data back and forth between local and remote units. However, protocol must be used to determine which specific transmitter can operate at any given time. Maximum data rate for a half duplex system is limited by the loop current charging time. These considera- tions were explained in the Simplex configuration section. Figures 16a and 16b illustrate half duplex application for the combination of HCPL-4100/-4200 optocouplers. The unique and complementary designs of the HCPL-4100 transmitter and HCPL-4200 receiver optocoup- lers provide many designed-in benefits. For example, total optical isolation at one end of the current loop is easily accom- plished, which results in substantial removal of common mode influences, elimination of ground potential differences and reduction of power supply requirements. With this combina- tion of HCPL-4100/-4200 opto- couplers, specific current loop noise immunity is provided, i.e., minimum SPACE state current noise immunity is 1 mA, MARK state noise immunity is 8 mA. Voltage compliance of the current source must be of an adequate level for operating all units in the loop while not exceeding 27 V dc, the maximum breakdown voltage for the HCPL-4100. Note that the HCPL-4100 transmitter will allow output loop current to conduct when input VCC power is off. Consult the HCPL-4200 receiver optocoupler data sheet for specified device performance. For more information about the HCPL-4100/-4200 optocouplers, consult Application Note 1018. Figure 15. Full Duplex Point to Point Current Loop System Configuration. |
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