Description
The  YH4913 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  ES248 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.

Features
 Micropower consumption for battery powered applications
 Omnipolar, output switches with absolute value of North or South pole from magnet
 Operation down to 2.5V
 High sensitivity for direct reed switch replacement applications
 Chopper stabilized amplifier stage