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Crystal Instruments Spider - Output Circuit

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Spider DSA User’s Manual
79
Switch
EX_PWR
Input pin
EX_GND
Spider81 DIO Port
+3.3V/+12V
GND
RL
Figure 30. Switch connection to input
Output Circuit
The output channels can be connected to a current driven device such as a relay or
LED. They are opto-isolated, open-collector outputs, but require an external
voltage source.
EX_GND
EX_PWR
Output pin
Spider81
External power
supply 12VDC
External device
Optocoupler
Optocoupler
Logic output
Logic output
VCC
Output pin
Load1
Load2
Figure 31. Output Circuit
The maximum rated output current per channel is 60 mA. The output section
uses a low-saturated transistor for output, so it can be connected to a TTL-level
input. The figure above shows an example of a connection to an external LED.
The LED will illuminate when the output bit is 0.

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