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asad1111
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what are pull up and pull down resistors i read that i have to connect pull up resistors with microcontroller why they are called pull up resistors and not simple resistors?
A pull-up resistor is a passive electronic component that is used to ensure a stable logic state in a circuit. It is connected between the output of a circuit and the power source, providing a default high logic level when the output is not being actively driven.
Pull-up resistors are used to prevent floating inputs, which can result in unpredictable behavior in a circuit. They ensure that the output of a circuit remains at a known state, even when it is not actively being driven by a signal.
Pull-up resistors are commonly used in digital circuits, such as microcontrollers and other integrated circuits, to ensure a stable logic state. They are also used in open-collector circuits, which require an external pull-up resistor to function properly.
When an input signal is not actively driving the output of a circuit, the pull-up resistor pulls the output to a high logic level. This is achieved by connecting the resistor between the output and the power source, effectively creating a voltage divider circuit.
There are two main types of pull-up resistors: weak and strong. Weak pull-up resistors have a high resistance value, typically in the range of 10kΩ to 100kΩ, and are used in low-power applications. Strong pull-up resistors have a lower resistance value, typically in the range of 1kΩ to 10kΩ, and are used in high-speed applications.