98
MDE-LEDI-NETWORK-IN-4065V1.0
Here are some examples of how to use this output :
5.2. Examples of how to use the open collector output (pins 3-4)
General case :
You need to add R if the load (LED, loudspeaker,…) does not accept the VDC
►
voltage.
To avoid the transistor destruction, limit the input current to 30 mA (i = Vdc / R <
►
30mA).
TTL input command :
R
External
DC
Power
+
-
WaRNING :
VDC max = 45 Volts
3
4
loudspeaker
3
4
R
VDC
TTL input
If VDC = 5 Volts :
Ω
=
=
167
0.03
5
Rmin
so take
Ω
≥
180
R
WARNING : The open collector output is not compatible with an
extern power supply with a + pin connected to earth (telecom 48
Volts)..
aPPENDIx
a – CONNECTIONS
Содержание LEDI Network IN
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Страница 38: ...38 MDE LEDI NETWORK IN 4065V1 0 Le connecteur DB9 a le format suivant 5 4 3 2 1 9 8 7 6 GND TXD TX TX...
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