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Single-chip Hall ICs target mobile phone magnetic switches

Posted: 28 Apr 2006 ?? ?Print Version ?Bookmark and Share

Keywords:ROHM? Hall? BU52000? magnetic? proximity?

Japan-based IC maker Rohm Co. Ltd announced it has completed the development of the BU52000 series of single-chip Hall ICs for bipolar detection. Using WLCSP4 CSP, the BU52000 series is touted to be the smallest of its kind, making it suitable for magnetic switches in mobile phones.

Recent functional advances in mobile phones entailed an increase in LCD screen size. As a result, folding-type mobile phone units are becoming the mainstream models in the market. In the past, a mechanical switch was used to detect the opening and closing of the mobile phone. However, to prevent malfunction and to adjust to design restrictions, non-contacting switches have lately become predominant.

A conventional non-contacting switch has a two-chip construction: an InSb or GaAs Hall element for magnetic detection, and a separate circuit connecting to the main processing unit. According to Rohm, its new product has a silicon Hall element on a single chip that integrates the connection circuit as well. Additionally, the required mounting area of the BU52000 series is 1.1-by-1.1-by-0.5mm, about one-third to one-fourth of the area required by conventional models, said the company.

Other features of the BU52000 series include an intermittent operation method that saves energy, with a typical power consumption of 8&micron;A. The device also has an electrostatic discharge resistance of 8kV and its silicon Hall element has an operating temperature range of -40C to 85C.

Samples of BU52000 series are already available, with mass production scheduled in June 2006.

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