Point Grey Grasshopper - GPIO Electrical Characteristics; Status Indicator LED

Point Grey Research Grasshopper Technical Reference
Camera Interface
Revised 26-Nov-10
Copyright (c) 2010 Point Grey Research Inc.
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3.5.1. GPIO Electrical Characteristics
The Grasshopper GPIO pins are TTL 3.3V pins. When configured as inputs, the pins are
internally pulled high using weak pull-up resistors to allow easy triggering of the camera by simply
shorting the pin to ground (GND). Inputs can also be directly driven from a 3.3V or 5V logic
output. The inputs are protected from both over and under voltage. It is recommended, however,
that they only be connected to 5V or 3.3V digital logic signals. When configured as outputs, each
line can sink 10mA of current. To drive external devices that require more, consult the following
article for information on buffering an output signal using an optocoupler:
KB Article 200:
www.ptgrey.com/support/kb/index.asp?a=4&q=200
The V
EXT
pin (Pin 7) allows the camera to be powered externally. The voltage limit is 8-30V, and
current is limited to 1A.
The +3.3V pin is fused at 150mA. External devices connected to Pin 8 should not attempt to pull
anything greater than that.
3.6. Status Indicator LED
LED Status Description
Maximum red (Initial
connection)
Initial startup. On until camera is initialized.
Maximum red (During
operation)
Condition 1: Bus Rest. On for 0.66s.
Condition 2: Power failure. On until power-up via
CAMERA_POWER 0x610.
Dull Red Configuration error.
Bright Red Configuration error.
Dull Green Camera is idle.
Bright Green Firewire activity. On for 0.5s during activity.
Dull Yellow Powered down.
Bright Yellow Powered down + activity. On for 0.5s during activity.
Red/Green flashing Camera firmware is being updated. Flashes at 5Hz.
Table 3: Status indicator LED descriptions