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Point Grey <strong>Blackfly</strong> Technical Reference<br />
6 Input/Output Control<br />
6.6 GPIO Electrical Characteristics<br />
Both the opto-isolated input and output have over current protection.<br />
The output is open collector and thus requires a pull-up resistor to operate. The rise time and bias current will be<br />
determined by the resistor value chosen. If the camera is generating an output signal that approaches the rise time<br />
plus the fall time of the opto-isolated circuit, care must be taken to optimize the pull-up resistor chosen to minimize<br />
the rise time while still remaining within the current limits of the output circuit.<br />
To avoid damage, connect the OPTO_GND pin first before applying<br />
voltage to the GPIO line.<br />
Table 6.2: Operating Range<br />
Description Minimum Maximum<br />
Opto-isolated Input Voltage 0 V 30 V<br />
Opto-isolated Output Voltage 0 V 48 V<br />
Opto-isolated Output Current<br />
25 mA<br />
Table 6.3: Absolute Maximum Ratings<br />
Description Minimum Maximum<br />
Opto-isolated Input Voltage -70 V 40 V<br />
Opto-isolated Output Voltage -48 V 48 V<br />
6.6.1 Output Timing Characteristics<br />
Figure 6.1: Output Timing Characteristics<br />
Revised 12/13/2012<br />
Copyright ©2012 Point Grey Research Inc.<br />
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