Hall sensor features flexible programming

A novel monolithic linear Hall sensor integrates EEPROM for sophisticated programmable control.

In 1995 Melexis ushered in a new era in contactless position sensing with the introduction of the first monolithic programmable linear Hall sensor.

At that time, alternative solutions for position sensing were based either on contacting resistive potentiometers or on complex contactless constructions (such as a discrete Hall element combined with an interface IC and laser trimmed resistors for offset and gain settings).

When combined with an appropriate magnetic circuit, a programmable linear Hall sensor can simplify any rotary or linear position sensing application.

The sensor can also be factory calibrated to compensate for mechanical, magnetic, electrical and thermal system tolerances.

Now Melexis has developed the concept further with the release of the MLX90251, which integrates its own EEPROM for even more flexible programming.

The new device offers programmable control of: the output voltage when no field is applied (Voq); sensitivity (gain); direction of slope; the magnitude of sensitivity drift over temperature; clamping levels; thermal Voq drift; and bandwidth.

The linear ratiometric analogue output voltage is proportional to the applied magnetic flux density and supply voltage.

The MLX90251 features very stable thermal compensation for both sensitivity and Voq over a broad temperature range.

Each device is programmed with a unique ID number for manufacturing traceability.

Melexis has also developed a programming unit (PTC-03) for in situ calibration of the MLX90251.

These programmable linear Hall sensors can be used as the basic sensing element in any rotary or linear contactless position sensor application.

Automotive applications include: pedal position sensors, throttle position sensors, ride-height sensors and level sensors.

When used in combination with a slotted toroid they can also be used for current sensing.

The IC is housed into a thin leaded package (4-SIP-VA) suitable for any magnetic construction.

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