HCPL-4100-300E Datasheet HCPL-4100-500E, HCPL-4100-300E, HCPL-4100 | P10-P12

Figure 13. Recommended Non-Isolated Active Receiver with HCPL-4100 Isolated Transmitter for Simplex Point to Point 20 mA Current Loop.

25% distortion data rate at dierent V

values. 25% distor-

tion data rate is dened as that rate at which 25% distortion

occurs to output bit interval with respect to the input bit

interval. Maximum data rate (dotted line) is restricted by

device character is tics. An input Non-Return-to-Zero (NRZ)

test waveform of 16 bits (0000001011111101) was used

for data rate distortion measure ments. Enhanced speed

performance of the loop system can be obtained with lower

supply levels, as illustrated in Figure 15. In addition,

when loop current is supplied through a resistor instead

of by a current source, an additional series termination

resistance equal to the characteristic line impedance can

be used at the HCPL-4100 transmitter end to enhance

speed of response by approximately 20%.

Figure 14. Minimum Required Supply Voltage, V

, vs.

Loop Length for Current Loop Circuit of Figure 13.

Figure 15. Typical Data Rate vs. Distance and

Supply Voltage.

– VOLTS

L – LOOP LENGTH (ONE DIRECTION) METERS

100 1000

10000

= 0.00212 — (L) + 5.7 V

CABLE

= 0.05296

LOOP

= 20 mA

MARK

= 2.7 Vdc (HCPL-4100)

SAT

= 1.5 Vdc (CURRENT SOURCE)

= 25 °C

The cable used contained ve pairs of unshielded, twisted,

22 AWG wire (Dearborn #862205). Loop current is 20 mA

nominal. Input and output logic supply voltages are 5 V

dc.

Full Duplex

The full duplex point-to-point communication of Fig-

ure 16 uses a four wire system to provide simultane-

ous, bidirectional data communication between local

and remote equipment. The basic application uses

two simplex point-to-point loops which have two

separate, active, non-isolated units at one common

end of the loops. The other end of each loop is isolated.

As Figure 16 illustrates, the combination of Avago 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 conguration apply to the full

duplex case. Consult the HCPL-4200 receiver opto coupler

data sheet for specied device performance.

Half Duplex

The half duplex conguration, whether point to point or

multi drop, gives non-simultaneous bidirectional data ow

from transmitters to transmitters shown in Figures 17a and

17b. This conguration allows the use of two wires to carry

data back and forth between local and remote units. How-

ever, protocol must be used to determine which specic

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 cong ura tion section.

Figure 16. Full Duplex Point to Point Current Loop System Conguration.

Figures 17a and 17b 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 benets. For example, total optical isola-

tion at one end of the current loop is easily accom plished,

which results in substantial removal of common mode

inuences, elimination of ground potential dierences

and reduction of power supply requirements. With this

combina tion of HCPL-4100/-4200 opto couplers, specic

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 V

power is o. Consult the HCPL-4200 receiver optocoupler

data sheet for specied device performance.

For more information about the HCPL-4100/-4200 opto-

couplers, consult Application Note 1018.

Figure 17. Half Duplex Current Loop System Congurations for (a) Point to Point, (b) Multidrop.

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AV02-2352EN - July 2, 2010

P1-P3 P4-P6 P7-P9 P10-P12

HCPL-4100-300E

Mfr. #:

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Manufacturer:

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Description:

Logic Output Optocouplers 20mA Current Loop

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HCPL-4100-300E

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