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Omnipolar Hall switches from Diodes Inc

9th February 2009
ES Admin
Diodes Incorporated has introduced two low voltage Omnipolar parts that substantially reduce power consumption in battery-powered, hand-held devices and dramatically simplify production processes. Uses include contact-less lid or display orientation and position detection tasks in notebooks, mobile phones, digital still cameras and camcorders.
Operating over a wide supply voltage range, the micro-power AH1802 and AH1888 Hall Effect sensor switches will support a broad range of battery cell configurations, from single cell Lithium Ion through to dual cell alkaline / Zinc. As an illustration of their low power operation, the AH1888 consumes just 15µW for a supply voltage of 1.8V.

The AH1802 and AH1888 detect the magnetic field generated by both North and South poles, so removing the need for production processes to manage magnet orientation. In the presence of a local magnetic field, the sensor produces a low level ‘on’ output signal.

The AH1802 with an open drain single output offers very high sensitivity that makes it ideal for sensing vertically oriented or smaller sized magnets. Packaged in an ultra thin 0.4mm height DFN2015, the compact AH1802 fits slider style phones where height is critical.

Offered in the low profile SOT553 package, the AH1888’s dual complementary push-pull outputs, enables the device to be directly connected to a system processor without the use of pull up resistors. Outputs adjust to polarity changes, allowing the device to support key wheel type magnets which are used to detect position and orientation for displays or keyboards that pivot or rotate.

The sensors’ chopper stabilisation circuitry delivers superior temperature stability, making them less sensitive to physical stress and guards against switch-point drift. Both devices support an operating temperature range of -40ºC to 85ºC.

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