SS1139

Unipolar Hall-Effect Digital Switch

2

V3.10

Nov 1, 2013

General

Description

The SS1139 is a unipolar Hall-effect sensor IC fab-

ricated from bipolar technology. The device inte-

grates a voltage regulator, reverse battery protec-

tion diode, Hall sensor with dynamic offset can-

cellation system, temperature compensation cir-

cuitry, small signal amplifier, Schmitt trigger and

an open-collector output to sink up to 50 mA.

With suitable output pull up, they can be used with

bipolar or CMOS logic circuits.

These Hall-effect switches are monolithic integrat-

ed circuits with tighter magnetic specifications, de-

signed to operate continuously over extended tem-

peratures to +150°C,and are more stable with both

temperature and supply voltage changes. Internal

compensation characteristic makes the sensitivity

increase slightly with temperature increasing, so

that this IC is Particularly suitable to be used with

the commonly low-cost magnets. If a magnetic flux

density larger than threshold Bop, Output is turned

on (low). When a magnetic flux density reversal

falls below Brp, Output will be turned off (high).

Thanks to its wide operating voltage range, ex-

tended choice of temperature range and high relia-

bility, it is quite suitable for use in automotive, in-

dustrial and consumer applications.

Glossary of Terms

MilliTesla (mT), Gauss

Units of magnetic flux density: 1mT = 10 Gauss

RoHS

Restriction of Hazardous Substances

Magnetic flux density applied on the branded side of the package which turns the

Release Point (BRP)

Magnetic flux density applied on the branded side of the package which turns the