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PDF HCPL-4100500 Data sheet ( Hoja de datos )
| Número de pieza | HCPL-4100500 | |
| Descripción | Optically Coupled 20 mA Current Loop Transmitter | |
| Fabricantes | Agilent(Hewlett-Packard) | |
| Logotipo | .gif "Agilent(Hewlett-Packard)"){kind=logo} |
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Optically Coupled 20 mA
Current Loop Transmitter
Technical Data
HCPL-4100
Features
• Guaranteed 20 mA Loop
Parameters
• Data Input Compatible with
LSTTL, TTL and CMOS
Logic
• Guaranteed Performance
over Temperature (0°C to
70°C)
• Internal Shield for High
Common Mode Rejection
• 20 kBaud Data Rate at 400
Metres Line Length
• Guaranteed On and Off
Output Current Levels
• Safety Approval
UL Recognized -2500 V rms for
1 minute
CSA Approved
• Optically Coupled 20 mA
Current Loop Receiver,
HCPL-4200, Also Available
Description
The HCPL-4100 optocoupler is
designed to operate as a transmit-
ter in equipment using the 20 mA
current loop. 20 mA current loop
systems conventionally signal a
logic high state by transmitting
20 mA of loop current (MARK),
and signal a logic low state by
allowing no more than a few
milliamperes of loop current
(SPACE). Optical coupling of the
signal from the logic input to the
20 mA current loop breaks
ground loops and provides very
high immunity to common mode
interference.
Functional Diagram
The HCPL-4100 data input is
compatible with LSTTL, TTL, or
CMOS logic gates. The input
integrated circuit drives a GaAsP
LED. The light emitted by the
LED is sensed by a second inte-
grated circuit that allows 20 mA
to pass with a voltage drop of less
than 2.7 volts when no light is
emitted and allows less than 2 mA
to pass when light is emitted. The
transmitter output is capable of
withstanding 27 volts. The input
integrated circuit provides a
controlled amount of LED drive
current and takes into account
any LED light output degrada-
tion. The internal shield allows a
guaranteed 1000 V/µs common
mode transient immunity.
Applications
• Isolated 20 mA Current
Loop Transmitter in:
Computer Peripherals
Industrial Control Equipment
Data Communications
Equipment
A 0.1 µF bypass capacitor connected between pins 8 and 5 is recommended.
CAUTION: It is advised that normal static precautions be taken in handling and assembly of this component to
prevent damage and/or degradation which may be induced by ESD.
1 page  
5
Recommended Operating Conditions
Parameter
Power Supply Voltage
Input Voltage Low
Input Voltage High
Operating Temperature
Output Voltage
Output Current
Symbol
VCC
VIL
VIH
TA
VO
IO
Min.
4.5
0
2.0
0
0
0
Max.
20
0.8
20
70
27
24
Units
Volts
Volts
Volts
°C
Volts
mA
DC Electrical Specifications
For 0°C ≤ TA ≤ 70°C, 4.5 V ≤ VCC ≤ 20 V, all typicals at TA = 25°C and VCC = 5 V unless otherwise noted.
See note 12.
Parameter
Mark State Output
Current
Mark State Short
Circuit Output
Current
Space State Input
Current
Low Level Input
Current
Low Level Input
Voltage
High Level Input
Voltage
High Level Input
Current
Supply Current
Symbol
VMO
ISC
Min.
30
Typ.
1.8
2.2
2.35
85
Max. Units
Test Conditions
2.25
2.7
Volts
Volts
Volts
mA
IO = 2 mA
IO = 12 mA
IO = 20 mA
VI = 2.0 V
VI = 2 V, VO = 5 V to 27 V
Fig. Note
2, 3
4
ISO 0.5 1.1 2.0 mA VI = 0.8 V, VO = 27 V
4
IIL -0.12 -0.32 mA VCC = 20 V, VI = 0.4 V
VIL 0.8 Volts
VIH 2.0
Volts
IIH 20 µA VI = 2.7 V
100 µA VI = 5.5 V
0.005 250 µA VI = 20 V
ICC 7.0 11.5 mA VCC = 5.5 V 0 V ≤ VI ≤ 20 V
7.8 13 mA VCC = 20 V
5 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.
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet HCPL-4100500.PDF ] | |
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