AH1892

Description

The AH1892 is a micropower magnetic range selectable (Bop/Brp) Omnipolar Hall effect switch IC with internal pull up and pull down capability, designed for consumer equipment ranging from portable and battery powered cellular phones and portable PCs to home appliances and industrial applications. To support battery powered equipment and low voltage microcontrollers, the AH1892 can operate over the supply range of 1.6V to 3.6V and uses a hibernating clocking system to minimize the power consumption. The average supply current is only 4.3?A typical at 1.8V. Based on chopper stabilized architecture and ESD of 8kV on supply and output pins, the AH1892 provides reliable and robust solutions over the whole operating range. To minimize PCB space the AH1892 is packaged in the small and low profile U-WLB0707-4 (CSP 0.71mm x 0.71mm typical) or SOT553 leaded package The output is activated with either a north or south pole of sufficient magnetic field strength. The user can select one of two magnetic sensitivity bands via the BSEL pin without the addition of any external components allowing a flexible but small solution. The band select can be hardwired or be changed on the fly via a logic source such as a micro-controller. When the magnetic flux density (B) is larger than operate point (Bop), the output will be turned on (pul°C low) and held until B is lower than release point (Brp).

Application(s)

• Open and close detect for cellular phones

Holster detect for cellular phones and Smart phones

Cover switch in portable PCs - Tablets and Notebooks

Camcorders and still cameras

Contact-less switch in consumer battery power products

Proximity, position, level and dial switch position detection