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What is the advantage of an open collector output?
The advantage of open-collector outputs, or open-drain outputs is that the load to be switched or controlled can be connected to a voltage supply which is independant, and/or different from the supply voltage used by the controlling circuit, and that they can “sink” or “source” an externally-supplied voltage depending …
What is an open-collector device?
Open-collector devices are commonly used to connect multiple devices to one interrupt request signal or a shared bus such as I²C. This enables one device to drive the bus without interference from the other inactive devices.
How does a 5V transistor work on an open collector?
You connect the positive side of your device (a high power LED, solenoid, etc) to the 5v connection and the negative side to a drive output. Electrically the transistor in an open collector configuration acts just like a mechanical on-off switch (except with the benefits listed previously).
What can an open collector output be used for?
An open-collector output is used to connect one side of the device being controlled to ground. The other side of the device will be connected to power. If you look at the CRICKIT “drive” outputs you will see that this is exactly what they are.
Are there any problems with an open collector?
One problem with open-collector devices is power consumption, since the pullup resistor dissipates power whenever the output is pulled low, and the higher the desired operating speed, the lower the resistor value (i.e. the stronger the pullup) needs to be, resulting in increased consumption.
Are there any SCSI devices that use open collector?
SCSI -1 devices use open collector for electrical signaling. SCSI-2 and SCSI-3 may use EIA-485 . One problem with open-collector devices is power consumption, since the pullup resistor dissipates power whenever the output is pulled low, and the higher the desired operating speed, the lower the resistor value (i.e.