SM3600AP

SEIKO NPC CORPORATION - 6

FUNCTIONAL DESCRIPTION

Function Overview

The SM3600AP is a magnetic sensor module that incorporates magnetic sensor elements, a bias magnet, and an amplifier IC in a compact

DIPpackage, required to detect magnetism.

The magnetic sensor elements in the SM3600AP detect changes in the magnetic field along the Y axis as shown in the following figure.

The sensor detect the magnetic pattern of measurement objects by detecting changes in the magnetic field, using a bias magnet, as the

object moves across the upper surface of the module package in the Y-axis direction. The SM3600AP package surface is not designed to

withstand wear, hence the measurement mechanism should be designed so that the measurement object does not come into contact with

the surface of the package. The recommended gap (separation between package surface and magnetic pattern) is 0.5 mm.

The magnetic field of the bias magnet is aligned so that the Z-axis component in the figure is strongest, with a magnetic flux density at the

package surface of 110mT (max).

Magnetic detection direction (Y axis), bias magnet magnetic direction (Z axis)

The detected magnetic field signal is converted to a voltage, then amplified by 60dB (1000 times amplification) by an internal amplifier,

and then output as an analog voltage on the OUT pin. An auto bias function is built-in to help obtain the appropriate DC voltage output

signal.

Magnetic Sensor Element Layout

The magnetic sensor elements are located as shown in the following figure. The measurement object must be aligned with the magnetic

sensor elements in order to detect the magnetic pattern.

Sensor layout

Location of sensors only. The figure does not represent an accurate depiction of sensor size and shape.

Y axis (magnetic detection direction)

Z axis (magnetic orientation of bias magnet)

⊗ X axis

magnetic pattern

Top View

1.5mm