Switches, Relays & Keypads


Continuous-time linear Hall-effect sensors

18 May 2005 Switches, Relays & Keypads

The A1301 and A1302 from Allegro MicroSystems Europe are continuous-time linear Hall-effect sensor ICs in the SOT23 surface-mount package rated for operation at up to 150°C. True ratiometric linear sensors, they provide an analog output signal that is proportional to the magnetic flux density and the supply voltage. The A1301 is the most sensitive device with a target sensitivity of 2,5 mV/Gs, while the A1302 has a target sensitivity of 1,3 mV/Gs.

The devices are designed for operation at voltages from 4,5 to 6 V, and offer a quiescent output voltage that is 50% of the supply voltage. The response time is less than 5 μs at power-up, and the devices will operate at up to 20 kHz.

Each device includes a Hall sensing element, linear amplifier and a CMOS Class A output structure. Having the Hall element and amplifier on a single chip minimises many problems normally associated with low-level analog signals. Factory programming after packaging provides tight quiescent output voltage and sensitivity distributions at room temperature.

These sensors are suited to use in linear and rotary position sensing systems over extended temperature ranges in automotive and related applications. They combine low-noise operation and low switch-point drift, while the ratiometric rail-to-rail output means that they can be used directly with analog/digital converters in microprocessor-controlled systems.

In addition to the 3-pin surface-mount SOT23-style package, the A1301 and A1302 are available in a 3-pin ultra-miniature single inline.

For more information contact Simon Churches, Arrow Altech Distribution, +27 (0)11 923 9600, [email protected]



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