Point Grey Flea3 FL3-U3 - GPIO Electrical Characteristics; GPIO0 (Opto-Isolated Input) Circuit

Point Grey Flea3 USB 3.0 Technical Reference 4 Input/Output Control
Offset Name Field Bit Description
Char_2 [17-23]
Character_2
Read: Read character from receive buffer+2. Padding data if data is not
available.
Write: Write character to transmit buffer+2. Padding data if data is
invalid.
Char_3 [24-31]
Character_3
Read: Read character from receive buffer+3. Padding data if data is not
available.
Write: Write character to transmit buffer+3. Padding data if data is
invalid.
Base +
104h
:
Base +
1FFh
SIO_DATA_
REGISTER_ALIAS
[0-31] Alias SIO_Data_Register area for block transfer.
4.6 GPIO Electrical Characteristics
Opto-isolated input pins require an external pull up resistor to allow triggering of the camera by shorting the pin to
the corresponding opto ground (OPTO_GND). Non opto-isolated input pins are internally pulled high using weak pull-
up resistors to allow triggering by shorting the pin to GND. Inputs can also be directly driven from a 3.3 V or 5 V logic
output.
The inputs are protected from over voltage.
When configured as outputs, each line can sink 10 mA of current. To drive external devices that require more,
consult Knowledge Base Article 200 for information on buffering an output signal using an optocoupler.
The V
EXT
pin (Pin 7) allows the camera to be powered externally. The voltage limit is 5-24 V, and current is limited to 1
A.
The +3.3V pin is fused at 150 mA. External devices connected to Pin 8 should not attempt to pull anything greater
than that.
To avoid damage, connect the OPTO_GND pin first before applying
voltage to the GPIO line.
4.6.1 GPIO0 (Opto-Isolated Input) Circuit
The figure below shows the schematic for the opto-isolated input circuit.
Revised 9/27/2012
Copyright ©2011-2012 Point Grey Research Inc.
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