pole of the magnetic target must be taken prior to installation. MR
sensors dispense with this step, potentially shortening manufacturing
time and improving quality. Another improvement to quality, according
to Edberg, is reduced variations to magnetic sensitivity. This exists with
all magnetic sensors, and Hall-effect devices typically show ± 15 Gauss.
The SM353LT shows a variation at typical operation of 14 G, and the
SM351LT is just 7 G.
Edberg says the Nanopower Series should also be considered for battery-powered applications where only reed switches have been commonly used due to low-power or high-sensitivity needs. Reed switches require no power and offer the equivalent of 10-Gauss sensitivity, allowing
excellent operation in battery-powered devices. But they are susceptible
to damage from vibration or shock, and can suffer damage during installation. Plus, these mechanical switches have a defined lifetime.
Finally, the industry standard SOT- 23 plastic molding package, which
is compatible with automated pick-and-place component fabrication
methods, is smaller and more durable than the glass packaging found in
reed switches, potentially creating an opportunity to design less-bulky
Based on these improvements, Honeywell has identified several
industrial applications where MR sensors’ advantages could be most
beneficial: including anti-tamper switches for gas, water and electric
meters; counting devices for gas and water meters; door and window
position for security sensors and a wide variety of battery-operated
medical equipment. Consumer-grade applications include white goods
Advanced circuitry designs are rapidly changing the sensor market,
and magnetic sensors are among the prime beneficiaries. With average
current draw measured below 500 nA, Honeywell’s new Nanopower
sensors should enable designers to create new classes of battery-powered
products previously not practical with other position sensing technologies.
Image of Honey well’s Nanopower Anisotropic Magnetoresistive Sensor IC.
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