Pull Up Resistor For Open Drain

If you make the output high the pin will be connected to vdd through the npn switch and if you make the output pin low the pin will be connected to ground thorough the pnp switch. Pull up resistor application by using these two pull up resistors one for each input when switch a or b is open off the input is effectively connected to the 5v supply rail via the pull up resistor.

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The first thing to recognize when dealing with an open drain output is whether a pull upor a pull down resistor is needed.

Pull up resistor for open drain. The pull up resistor is connected to high supply voltage at one end and connected to one or more external pins of the open drain collector devices all connected together. Microelectronic devices using open drain signals such as microcontrollers may provide a weak internal pull up resistor to connect the terminal in question to a positive voltage sourcerail like v dd of the device. Such weak pullups often on the order of 100 kw reduce power usage by keeping input signals from floating.

Thus if any one of the open drain open collector devices is set to sink current current flow for all of the devices gets sunk to the ground since they are all connected at the same point. There are few things that have to be considered when using a pull up resistor with the open drain output configuration. You can think of an open drain gpio as behaving like a switch which is either connected to ground or disconnected.

Choosing an appropriate pull uppull downresistor for open drain outputs. In order to achieve a logical high output on the line a pull up resistor is used to connect the open drain output to the desired output voltage level. If it is connected between supply rail and collector it is called pull up resistor in case of between emitter and ground it is pull down resistor as shown below.

Rising edge slope the pull up resistor in combination with the inherent capacitance of the line forms a low pass filter. Some times the ic has internal pull uppull down resistors. 2 choosing an appropriate pull uppull downresistor.

This depends on whether the ic drives the output high or low when it wants to assert it. It can be connected either from collector to ve supply rail or from emitter to ground. Since in the open drain type the pin is left as floating a pull high or pull down resistor is usually added to the gpio pin.

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