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HCPL-4200-300E

P1-P3P4-P6P7-P9P10-P12P13-P13
10
t
p
– ENABLE PROPAGATION DELAY – ns
-60 100
200
0
T
A
– TEMPERATURE –°C
-40 0 20 60 80
40-20
150
100
50
V
CC
C
L
= 15 pF
t
PHZ
t
PZH
20 V
4.5 V
4.5 V
20 V
t
p
– ENABLE PROPAGATION DELAY – ns
-60 100
100
0
T
A
– TEMPERATURE –°C
-40 0 20 60 80
40-20
80
60
20
V
CC
C
L
= 15 pF
t
PLZ
t
PZL
20 V
4.5 V
4.5 V
20 V
40
Figure 14. Typical Logic High Enable Propagation Delay vs. Temperature.
Figure 15. Typical Logic Low Enable Propagation Delay vs. Temperature.
Figure 16. Test Circuit for Common Mode Transient Immunity.
Applications
Data transfer between equipment which employs cur-
rent loop circuits can be accomplished via one of three
configurations: simplex, half duplex or full duplex com-
munication. With these configurations, point-to-point
and multidrop arrange ments are possible. The appropri-
ate configuration to use depends upon data rate, num-
ber of stations, number and length of lines, direction of
data flow, protocol, current source location and voltage
compliance value, etc.
Simplex
The simplex configuration, whether point to point or
multi drop, gives unidirectional data flow from transmit-
ter to receiver(s). This is the simplest configuration for use
in long line length (two wire), for high data rate, and low
current source compliance level applications. Block dia-
grams of simplex point-to-point and multidrop arrange-
ments are given in Figures 17a and 17b respectively for
the HCPL-4200 receiver optocoupler.
For the highest data rate per formance in a current loop,
the configuration of a non-isolated active transmitter
(containing current source) transmitting data to a re-
mote isolated receiver(s) should be used. When the cur-
rent source is located at the trans mitter end, the loop is
charged approximately to V
MI
(2.5 V). Alternatively, when
the current source is located at the receiver end, the loop
is charged to the full compliance voltage level. The lower
the charged voltage level the faster the data rate will be.
In the configurations of Figures 17a and 17b, data rate is
independent of the current source voltage compliance
level. An adequate compliance level of current source
must be available for voltage drops across station(s) dur-
ing the MARK state in multi drop applications or for long
line length. The maximum compliance level is deter-
mined by the trans mitter breakdown characteristic.
11
Figure 17. Simplex Current Loop System Configurations for (a) Point-to-Point, (b) Multidrop.
A recommended non-isolated active transmitter circuit
which can be used with the HCPL-4200 in point-to-point
or in multidrop 20 mA current loop applications is given
in Figure 18. The current source is controlled via a stan-
dard TTL 7407 buffer to provide high output impedance
of current source in both the ON
and OFF states. This non-isolated active transmitter pro-
vides a nominal 20 mA loop current for the listed values
of V
CC
, R2 and R3 in Figure 18.
Length of current loop (one direction) versus minimum
required DC supply voltage, V
CC
, of the circuit in Figure 18
is graphically illustrated in Figure 19. Multidrop configu-
rations will require larger V
CC
than Figure 19 predicts in
order to account for additional station terminal voltage
drops.
Typical data rate performance versus distance is illus-
trated in Figure 20 for the combination of a non-isolated
active transmitter and HCPL-4200 optically coupled cur-
rent loop receiver shown in Figure 18. Curves are shown
for 10% and 25% distortion data rate. 10% (25%) distor-
tion data rate is defined as that rate at which 10% (25%)
distortion occurs to output bit interval with respect to
input bit interval. An input Non-Return-to-Zero (NRZ)
test waveform of 16 bits (0000001011111101) was used
for data rate distortion measure ments. Data rate is inde-
pendent of current source supply voltage, V
CC
.
The cable used contained five pairs of unshielded, twist-
ed, 22 AWG wire (Dearborn #862205). Loop current is 20
mA nominal. Input and output logic supply voltages are
5 V dc.
12
Figure 18. Recommended Non-Isolated Active Transmitter with HCPL-4200 Isolated Receiver for Simplex Point-to-Point 20 mA Current Loop.
Figure 19. Minimum Required Supply Voltage, V
CC
, vs.
Loop Length for Current Loop Circuit of Figure 19.
Figure 20. Typical Data Rate vs. Distance.
Full Duplex
The full duplex point-to-point communication of Figure
21 uses a four wire system to provide simultaneous, bi-
directional data communication between local and re-
mote 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 21 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. The full duplex data
rate is limited by the non-isolated active receiver current
loop. Comments mentioned under simplex configura-
tion apply to the full duplex case. Consult the HCPL-4100
transmitter opto coupler data sheet for specified device
performance.
Half Duplex
The half duplex configuration, whether point-to-point
or multidrop, gives non-simultaneous bidirectional data
flow from transmitters to receivers shown in Figures 22a
and 22b. 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 considerations
were explained in the Simplex config ura tion section.
Figures 22a and 22b 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 optocouplers
provide many designed-in benefits. For example, total
optical isolation at one end of the current loop is eas-
ily accomplished, which results in substantial removal
P1-P3P4-P6P7-P9P10-P12P13-P13

HCPL-4200-300E

Mfr. #:
Buy HCPL-4200-300E
Manufacturer:
Broadcom / Avago
Description:
Logic Output Optocouplers 20mA Current Loop
Lifecycle:
New from this manufacturer.
Delivery:
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