Cellular phone

The technologies possessed by Asahi Kasei Microdevices on magnetic sensors, analog signal processing IC with low power consumption, signal processing algorism are integrated to actually provide high-functional sensors to pick information useful to human life from faint sensor signals.
This page introduces the open/close sensor which is a magnetic sensor for cellular phones, pointing device, and electronic compass made by Asahi Kasei Microdevices.

Open/close sensor

Recently, most of cellular phones are of flip type. When a cellular phone is folded, the magnet on the key approaches the Hall sensor on the display, and the sensor detects a magnetic field and turns off the screen. When a cellular phone is unfolded, the magnet moves away from the sensor making the magnet field weak, and the sensor turns on the screen. The Hall sensor is used in such a non-contact switch.
The Hall sensor can also cover various types of cellular phones such as swivel type, flip type, and slide type. It prolongs the useful life of batteries for cellular phones, and also serves as a new action switch.

Analog pointing device

Cursor key on cellular phone
The conventional cross key can move only in 4 directions, up/down and right/left. The analog pointing device with a Hall sensor, however, can move quickly and freely like a mouse for personal computers. This is a very useful new function for creating an email and playing a game.
Recently, the number of cellular phones equipped with the “full browser function” is increasing. The high user friendliness makes this device focused on again.
The analog pointing device will develop a new application of cellular phones.

>> Application Note > Pointing device(APD)

Rotating device (jog mechanism)

Hall effect ICs are used for rotating scroll mechanism of the highly operable input devices , which is suitable for mobile phone It is long-lived with non-contact revolution detection by latch type Hall Effect ICs.

>> Application Note > Rotating device (jog mechanism)
>> Products > Hall effect IC > Line-up > Latch