Notebook Computer Sleep Mode using Reed Sensors

Notebook computers and Netbooks are part of personal life. Screen time on these devices is anywhere between 2 and 6 hours and this too when on the move, with minimal charging. To be energy efficient to the maximum, simple functions such as the closing of the screen or a case should cut off supply to the screen and change the Notebook Computer’s state to a power saving or sleep mode.

Due to the extremely competitive market of Notebook Computers and digital devices, manufacturers need to come out with thinner and smaller models every year and are embedding batteries permanently into the enclosure with no option to have them changed.

Furthermore, components being used on such circuits also need to be energy efficient to ensure maximum battery life. The simple motion of closing the screen on a notebook computer should instantly put the device in sleep mode and save battery.

Reed Switch and reed-based sensors are inherently energy saving devices as they do not require power for operation and can reliably switch extremely low current signal loads in the range of few femto-amps. Even when the sensor is in an actuated state, the resistance across the contacts is so low in the order of a few milli-Ohms, that unnecessary battery drain is avoided.

All one needs is a reed sensor mounted on the control circuit with a tiny rubber or plastic magnet on the screen. The Reed Sensors is triggered when the screen is closed and this enables the sleep function.

Application Classification

Applications are classified as Position Sensing, Pulse Counting, Electromagnetic or Relay, Temperature Sensing or Magnet Biasing types. This application is classified as follows and the link gives more information on best practices to help select the most suitable AT band and matching magnet.

Position sensing Type

When an application requires the end position of a movement sensed, or the sensing of a part when it comes into a zone, or when the Continue reading ->

Mar 21, 2025

Recommended Products

The Reed Switches and Sensors used in such applications need to be robust, durable and efficient in meeting a high life expectancy. Our engineers work hard in life testing our products under various conditions, and our intention is to ensure end product durability and life. Although we wouldn’t want to restrict any of our products for use in only certain applications, the recommended products for use in this application are listed below.