Pull Up And Pull Down Resistors Pdf

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In the embedded EveryCircuit below, the circuit on the left shows an input switch circuit without a pull-up resistor. The circuit on the right shows it with a pull-up resistor. The input switch circuit comprises the resistor and the switch.

Pull-up resistor

Well, as for any microcontroller E. Pull-up resistors are fixed value resistors used between the connection of a voltage supply and a particular pin in a digital logic circuit. More commonly paired with switches, its purpose is to ensure the voltage between Ground and Vcc is actively controlled when the switch is open. Additionally, not affecting the state of the circuit when doing so as well. Similarly to pull-up resistors, pull-down resistors ensure the voltage between VCC and a microcontroller pin is actively controlled when the switch is open. However, instead of pulling a pin to a high value, such resistors pull the pin to a low valued instead. Though being less commonly used, a pull-down resistor is still a valid option.

Track My Order. Frequently Asked Questions. International Shipping Info. Send Email. Mon-Fri, 9am to 12pm and 1pm to 5pm U. Mountain Time:. Pull-up resistors are very common when using microcontrollers MCUs or any digital logic device.

It is a passive component which provides resistance when current flow through it. There are many different types of resistors. If we consider a digital circuit , the pins are always be either 0 or 1. In some cases, we need to change the state from 0 to 1 or from 1 to 0. In either case, we need to hold the digital pin either 0 and then change the state to 1 or we need to hold it 0 and then change to 1.

Pull-up Resistors

Welcome, Guest. Please login or register. Did you miss your activation email? This topic This board Entire forum Google Bing. Print Search. Author Topic: Pull up vs.

Electrical Engineering Stack Exchange is a question and answer site for electronics and electrical engineering professionals, students, and enthusiasts. It only takes a minute to sign up. Can some one explain this terminology please I think I understand it but not completely sure. Here, you can see that when the switch is open, in the pullup scenario the input pin will read high, but for pull down it will read low. The basic function of a pull-up or pull-down resistor is to insure that given no other input, a circuit assumes a default value. But one pulls the line high, the other pulls it low. Lots of valid points here, examples of what pull-ups are , and certainly you can work out which way is up from them, but I'm going to aim this at the 'explain the terminology' aspect..


Pull-up resistors are resistors which are used to ensure that a wire is pulled to a high logical level in the absence of an input signal. What are pull-down resistors?


Pull-up resistor

In electronic logic circuits , a pull-up resistor or pull-down resistor is a resistor used to ensure a known state for a signal. It is typically used in combination with components such as switches and transistors , which physically interrupt the connection of subsequent components to ground or to V CC. When the switch is closed, it creates a direct connection to ground or V CC , but when the switch is open, the rest of the circuit would be left floating i. For a switch that connects to ground, a pull-up resistor ensures a well-defined voltage i.

Microcontrollers and pull-up / pull-down resistors

The main function of pull-up and pull-down resistors is that the pull up resistor pulls the signal to high state unless it is driven low; and, a pull-down resistor pulls the signal to low state unless it is driven high. The Resistor is a most commonly used component in many electronic circuits and electronic devices. The main function of the resistor is, it restricts the flow of current to other components. The resistor works on the principle of ohms law which states that dissipation due to the resistance. The unit of resistance is ohm and the symbol of ohm shows resistance in a circuit. There are numerous resistor types are available in the market with different sizes and rating. Consider a two resistors in series connection, then the same current I flows through the two resistors and the direction of the current is indicated by an arrow.

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5 Response
  1. Alf L.

    These unused logic inputs can be tied together or connected to a fixed voltage, using a high value resistor to either the Vcc voltage, known as pull-up or via a low​.

  2. Caroline B.

    What is a pull up and pull down resistor? A Pull-up resistor is used to make the default state of the digital pin as High or to the logic level (in the.

  3. Sophie F.

    All open drain outputs require the use of an external pull-up or pull-down resistor to keep the digital output in a defined logic state. This application report.

  4. Grosvenor R.

    To prevent this unknown state, a pull-up or pull-down resistor will ensure that the pin is in either a high or low state, while also using a low amount of current.

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