The pin of this chip will be LOW normally and when the switch is closed becomes HIGH. This pull down resistor circuit can be used exactly as is for every pull down resistor circuit. The perfect model of a pull-down resistor circuit is shown below. When the switch is closed, now the pin makes direct contact with ground and is now LOW.Ī pull down resistor pulls a pin of a chip down to a LOW state, so that it is normally LOW unless intentionally brought Due to the open switch, all of the voltageįrom the power supply drops across the resistor. How this circuit works is the resistor is directly connected to the positive voltage. The pin of this chip will be HIGH normally and when the switch is closed drops to LOW. This pull up resistor circuit can be used exactly as is for every pull up resistor circuit. The perfect model of a pull-up resistor circuit is shown below. Typical values are 10KΩ or 100KΩ.Ī pull up resistor pulls a pin of a chip up to a HIGH state, so that it is normally HIGH unless intentionally brought LOW. The resistor value used for pull up and pull down resistors is usually 10KΩ or higher. Pull down resistors give a pin of a chip a clear LOW signal.Īnd when connected to switches such as pushbuttons, both pull up and pull down resistors can switch states so that a pull up resistorĬan be bring a pin to a LOW state and a pull down resistor can bring a pin to a HIGH state. Pull up resistors give a pin of a chip a clear Not defined, we have no control because the pins are floating randomly and haphazardly. When pins are well defined, we have control over the circuit. Pull down resistors pull down a pin to a LOW state. Pull up resistors pull up a pin to a HIGH state. And this is exactly why we use pull up and pull down resistors. We know for sure whether it is LOW or HIGH. Going into a pin so that we can know for sure exactly what its state is. And this is why we normally want a defined signal Things such as external noise may allow it Pins may float because they have no clear defined voltage signal going into it. In this case, the pin may go randomlyīetween LOW or HIGH. Or pins can be floating, meaning they are unconnected to either a LOW or HIGH voltage. Pins can be HIGH, meaning a voltage above half of the voltage fed into the chip's power supply is fed into the pin. They can be LOW, meaning a voltage near 0V (or below half of the voltage fed into the power supply of the chip) Pull up or pull down resistors are normally connected to the pins of chips so that they can define the state of the pins. Pull up and pull down resistors are truly brilliant when working with chips (ICs), In this article, we go over the brilliance of pull up and pull down resistors. Pull up and Pull down Resistors- Explained
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