Datasheet
13
Figure 21. Full Duplex Point-to-Point Current Loop System Conguration.
differences and reduction of power supply require-
ments. With this combination of HCPL-4100/-4200
optocouplers, specic current loop noise immunity is
provided, i.e., minimum SPACE state current noise im-
munity 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 loop current to conduct when in-
put V
CC
power is o. Consult the HCPL-4100 transmitter
optocoupler data sheet for specied device performance.
For more information about the HCPL-4100/-4200
optocouplers, consult Application Note 1018.
Figure 22. Half Duplex Current Loop System Congurations for (a) Point-to-Point, (b) Multidrop.
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Data subject to change. Copyright © 2007 Avago Technologies Limited. All rights reserved. Obsoletes 5989-2100EN
AV01-0541EN July 30, 2007