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Part I: PC2-CamLink Board
PC2-CamLink User's Manual
3.3V
Opto
Opto2_Trig -
Opto-Coupler
1.33k
(1W)
221
(0.1W)
3.3V
Opto-Coupler
Trigger
Controller
J3: opto2
J4: opto2
Opto
Opto1_Trig -
1.33k
(1W)
221
(0.1W)
J5: opto1
J6: opto1
Figure 6: Opto-coupler
When current flows inside the LED, the emitted light acts as a base current for the transistor.
Depending on the amount of light that is being emitted, the transistor can be turned ON, just like a
switch. The information, in the form of a voltage, is transmitted from one side to the other as a
transistor being turned ON or OFF. The opto-coupled input is an inverting circuit; PC2-CamLink
software compensates for this when specifying the polarity.
The surrounding circuit that converts the voltage to current and into the LED is therefore crucial to the
performance of the opto-coupler. If the current flowing through the LED is too small, the emitted light
will not turn the transistor ON.
HPCL-0531 is the typical opto-coupler on the PC2-CamLink. It is designed for high-speed TTL/TTL
applications. A standard 16mA TTL sink current through the input LED will provide enough output
current for one TTL load. Maximum rates are given below:
Electrical
parameters
Description
Value
I
F avg
Average forward input current
25mA
I
F peak
Peak forward input current
50mA
V
R
Reverse LED input voltage
5V
t
pHL max
Maximum propagation delay from high to low
1.0
μ
s
t
pLH max
Maximum propagation delay from low to high
1.0
μ
s
Note:
TTL signals are approximately 0 and 5V corresponding to logical 0 and 1, respectively. A
standard TTL output can sink 16mA and could be used as a sink to drive an opto-coupled input. In
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Страница 117: ...PC2 CamLink User s Manual Part IV Troubleshooting and Support 113 Part IV Troubleshooting and Support ...
Страница 118: ...114 Part IV Troubleshooting and Support PC2 CamLink User s Manual ...
Страница 130: ...126 Glossary of Terms PC2 CamLink User s Manual ...