Low-power Hall switches
13 November 2013
Switches, Relays & Keypads
Diodes Incorporated has extended its family of Hall effect switches with the introduction of a pair of high-sensitivity, micropower devices. The AH1902 and AH1903 are targeted at a wide range of contactless switch applications in consumer, domestic, office and industrial products.
The AH1902 is an omnipolar device, detecting both north and south pole magnets. In default mode, the programmable AH1903 operates as a unipolar device, detecting a south pole at the part marked package surface. The device also offers an omnipolar mode, enabling it to meet the needs of multiple applications and to be changed ‘on the fly’ in the event of a field direction issue. The AH1903 function is changed via a simple select pin, driven by an external logic source or microcontroller.
The high sensitivity of both switches means weaker magnets can be employed or detection distances extended; the switches’ typical operating threshold switch point being ±35 G. Designed to be used with a low-voltage supply, these Hall switches will operate over the range of 1,6 V to 3,6 V. This factor, coupled with an integral sleep function and a typical current consumption figure of 4,3 μA, makes them well suited to battery-powered applications.
To aid product miniaturisation, the devices are provided in a choice of space-saving low profile surface mount packages. The omnipolar AH1902 comes in the DFN1216-4, ultra-thin DFN2015-6 and SOT553 packages, while the AH1903 comes in the 1,2 x 1,6 x 0,5 mm DFN1216-4 package.
To accommodate a wide range of handheld applications, the switches have an 8 kV electrostatic discharge withstand capability and offer good immunity to RF noise and other circuit stresses. Operating and release points are also highly stable over the temperature range from -40°C to +85°C, and with a very low temperature coefficient, the switches are immune to early or late switching.
For more information contact Erich Nast, Avnet Kopp, +27 (0)11 319 8600, [email protected], www.avnet.co.za
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