SS40A

CMOS Omnipolar High Sensitivity Micropower Hall Switch

Packages

Features and Benefits

1.

Operation down to 2.5V

2.

Wide operating voltage range

3.

High sensitivity for direct reed switch replacement

applications

4.

Omnipolar, output switches with absolute

5.

value of North or South pole from magnet

6.

Temperature compensation

7.

Open-Collector pre-driver

8.

60V maximum withstand voltage

9.

Reverse polarity protection

 

3 pin SIP (suffix UA)

10.

Package: TO-92S(SIP)

Functional Block Diagram

Application Examples

1.

Brush-less DC Motor

2.

Brush-less DC Fan

3.

Revolution counting

4.

Speed measurement

 

General Description:

The SS40A 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

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. An internal bandgap regulator is used to provide temperature compensated supply

voltage for internal circuits and allows a wide operating supply range.

magnetic field.

1

V1.10

May 1, 2011