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-IO Expansion Board
EPAQ
OPTOOUTV+
OUTPUT SWITCH DEVICES
OPTOOUTV-
CONNECTION REQUIRED
1
EACH OUTPUT 80mA MAXIMUM
2
DIODE REQUIRED ON EACH OUTPUT THAT DRIVES AN INDUCTIVE DEVICE (COIL), SUCH AS A RELAY.
3
Figure 3-12:
Suppression diodes must be installed on outputs driving relays or other inductive devices. This protects the
outputs from damage caused by inductive spikes. Suppressor diodes, such as the 1N914, can be installed
on all outputs to provide protection. It is important that the diode be installed correctly (normally reversed
biased). See
Figure 3-12
for an example of a current sourcing output with diode suppression.
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1
PIN-1
+
LOAD
-
OPTOOUT3
PIN-6
OPTOOUT2
PIN-5
OPTOOUT1
PIN-4
OPTOOUT0
2
PIN-3
PIN-2
Outputs Connected in Current Sinking Mode
for an example of a current sinking output with diode suppression and
Chapter 3
Ensemble Epaq Hardware Manual
+
LOAD
-
+
LOAD
-
+
LOAD
-
5-24 VDC
+
-
3
Figure 3-11
69
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