How do you use an open collector output?

With open collector output, you simply cannot just connect the output device to the pin and then to ground. Open collector does not work that way. It must have positive voltage and then the load and the negative or ground side of the load connects to the output.

How do you use an open drain?

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What is the advantage of using an open collector output and what must be taken in account when connecting it to a PLC?

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 …

Why open drain is used?

An open-drain is commonly found in many integrated circuits. This helps multiple devices to connect with the usage of single wire which is in a mode of pull-down operation.

How do you open a transistor?

With a zero signal applied to the Base of the transistor it turns “OFF” acting like an open switch and zero collector current flows. With a positive signal applied to the Base of the transistor it turns “ON” acting like a closed switch and maximum circuit current flows through the device.

What does it mean for a driver to be open drain?

Both SCL and SDA lines are “open drain” drivers. What this means is that the chip can drive its output low, but it cannot drive it high. For the line to be able to go high you must provide pull-up resistors to the 5v supply.

What is open drain reset?

Open-Drain Output RESET goes high impedance when Q1 turns off and VRESET goes to the supply rail. The pull-up resistor can be connected to a voltage supply other than the supply of the supervisory circuit. The bus is low when the reset output of any one supervisory circuit goes low.

What is open drain?

The term “open drain” means there’s a current sink, but on a FET device, for example, a MOSFET. (A MOSFET is like a transistor that can handle higher voltages but operates in much the same way.) The term “open collector” refers to a current sink on a transistor output.

How can I drive NPN transistor?

NPN Transistor as a Switch When a sufficient voltage (VIN > 0.7 V) is applied between the base and emitter, collector to emitter voltage is approximately equal to 0. Therefore, the transistor acts as a short circuit. The collector current VCC / RC flows through the transistor.