MT1322
Omni-polar, CMOS Micropower Hall Sensors
1．Features
·Micropower consumption for battery powered applications
·Omnipolar, output switches with absolute value o North or South pole from magnet
· Operation down to 2.2V
·Very High sensitivity for direct reed switch replacement applications Chopper stabilized amplifier stage
2．Description
The MT1322 Omnipolar Hall effect sensor IC is fabricated from mixed signal
CMOS technology .It incorporates advanced chopper-stabilization techniques to
provide accurate and stable magnetic switch points.
The circuit design provides an internally controlled clocking mechanism to
cycle power to the Hall element and analog signal processing circuits. This serves to
place the high current-consuming portions of the circuit into a 'Sleep' mode.
Periodically the device is 'Awakened' by this internal logic and the magnetic flux
from the Hall element is evaluated against the predefined thresholds. If the flux
density is above or below the Bop/Brp thresholds then the output transistor is driven
to change states accordingly. While in the 'Sleep' cycle the output transistor is
latched in its previous state. The design has been optimized for service in
applications requiring extended operating lifetime in battery powered systems.
The output transistor of the MT1321 will be latched on (Bop) in the presence
of a sufficiently strong South or North magnetic field facing the marked side of the
package. The output will be latched off (Brp) in the absence of a magnetic field. |
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