Introducing BU52000 Series as the world's smallest Hall IC for dipole detection
Ideal for magnetic switch used in mobile phones

ROHM has recently completed the development of the BU52000 Series, the world's smallest one-chip Hall IC for dipole detection. The sample distribution of BU52000 Series has already started, and the mass production is scheduled for June 2006 at a monthly rate of 3,000,000 units.
ROHM APOLLO DEVICE (in Chikugo-shi, Fukuoka) will be in charge of the primary stage of production, and ROHM FUKUOKA (in Yukuhashi-shi, Fukuoka) will be in charge of the secondary stage.

The recent functional advancement of the mobile phones has entailed an increase in the 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. To prevent malfunction and due to some design restrictions, models employing non-contacting switches are still predominating. A typical conventional model is of two-chip construction: an InSb or GaAs Hall element is used for magnetic detection, while a different circuit is needed for the connection to the main processing unit (MPU). ROHM's BU52000 Series uses a silicon Hall element for a single chip that integrates the connection circuit as well. ROHM used the WLCSP4 Chip Scale Package (CSP) to make the BU52000 Series as the world's smallest size in the category. The required mounting area of the BU52000 Series is 1/3 to 1/4 of the conventional models, which contributes to a great space reduction in the mobile phone. Furthermore, the BU52000 Series incorporates a variety of features, such as low power consumption attained simultaneously with high reliability.

· Main Features of BU52000 Series

1. An ultra compact and thin-profile package in the world's smallest class with a mounting area of 1.1×1.1×0.5 mm.
2. Adopts an intermittent operation method that greatly saves energy with an average power consumption of 8µA (typical).
3. A highly reliable design with an electrostatic discharge (ESD) resistance of 8 kV measured with a human body model (HBM) ensured by an ideal element structure and circuit optimization.
4. Incorporates a silicon Hall element with a wide operating temperature range (-40°C to 85°C).

ROHM has been providing the LSI field for mobile phone units and compact portable devices with highly reliableproducts and a wide range of system solutions, such as power management LSI and analog baseband LSI chips. To develop this product, ROHM has made full use of its unique and excellent technology . ROHM will continue striving for the development of products with high added values meeting the prospective expectations of those who use its products.

· Specifications