Single Hall Effect Switch

ATS137

Anachip Corp.

www.anachip.com.tw

Rev. A5 Jul 14, 2004

5/7

ATC

Application Information (Continued)

Vo will turn on(low) if the S magnetic flux larger than operation point (Bop), and turns off whenever the

magnetic flux is removed and lower than release point (Brp). The related waveforms are shown in Fig.3.

Bop

Brp

Vce(sat)

Vcc

Vo

magnetic flux (mT)

t

t

S

Hall Effect switch

Marking side

Fig.3 Vo and magnetic flux variety

The major applications are for contactless switching and shown as follows:

-

VCD/DVD loader, CD/DVD ROM: Detect if the tray is opened or closed

-

Cover detector (open/close): Cellular phone cover detector, Refrigerator door detector, Microwave oven

door sensor… etc

-

Home safety: instead of reed relay to detect the situation of door/window.

-

Due to contactless and without mechanical contact point, its reliability and life cycle are much longer than

reed relay. In addition, its switching speed is much faster than mechanical devices.