Extron IPL EXP S2 handleiding
Handleiding
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IPL EXP I/O Series • Hardware Features and Installation 25
• Digital I/O digital output with pull-up disabled:
• When switch 1 closes, the port is on and the front panel LED (IPL EXP RIO8 only) is on.
• When switch 1 opens, the port is off and the front panel LED (IPL EXP RIO8 only) is off.
• Example application, digital output without pull-up: connecting an LED and an external
+5 VDC power source
This application often requires a current-limiting resistor, as shown in the diagram below. Many
button switches that contain LEDs have a resistor built in. See the guide for the lighted switch or
stand-alone LED for details.
NOTE: Each I/O pin is capable of sinking a maximum of 250 mA.
+
-
+5.0 V
1k ohms
SW 2
SW 1
Digital
I/O
GND
Voltage
Protection
CTL
LED
Externa
l
+5 VDC
Power
Source
Resistor
(R)
Figure 14. Digital I/O Digital Output Application:
LED and External +5VDC Power Source Without Pull-up
To determine the value of the current limiting resistor in the circuit shown above, you need to
know the values of three variables:
i = LED forward current in amps (found in the data sheet for the LED)
V
f
= LED forward voltage drop in volts (found in the data sheet for the LED)
V
s
= supply voltage of the external voltage source
Insert those values into the following equation to determine the resistor value:
R =
V
s
- V
f
i
Example calculation:
i = 5 mA (0.005 A)
V
f
= 2 V
V
s
= 5 V
NOTE: If the value calculated for the current limiting resistor is not a standard resistor value, you can
round up the number to the next highest common resistance value.
The connected LED is off when the port and switch 1 are open.
The connected LED is on when the port and switch 1 are closed.
14
}
=
5 V - 2 V
0.005 A
=
600 ohmsR =
V
s
- V
f
i
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Productinformatie
| Merk | Extron |
| Model | IPL EXP S2 |
| Categorie | Niet gecategoriseerd |
| Taal | Nederlands |
| Grootte | 7534 MB |
