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US5881

CMOS Multi-Purpose Switch

Unspecified 

US5881

CMOS Multi-Purpose Switch

Unique Features

CMOS Hall IC Technology

The chopper stabilized amplifier uses switched ca-

pacitor techniques to eliminate the amplifier offset

voltage, which, in bipolar devices, is a major source

of temperature sensitive drift. CMOS makes this ad-

vanced technique possible.

The CMOS chip is also much smaller than a bipolar

chip, allowing very sophisticated circuitry to be

placed in less space. The small chip size also contrib-

utes to lower physical stress and less power con-

sumption.

Installation

Consider temperature coefficients of Hall IC and

magnetics, as well as air gap life time variations. Ob-

serve temperature limits during wave soldering.

Application Comments

If reverse supply protection is desired, use a resistor

in series with the VDD pin. The resistor will limit the

supply current (Fault), IDD, to 50 mA. For severe

EMC conditions, use the application circuit below.

Applications Examples

Automotive and Severe

Environment Protection Circuit

R1 100Ω

D1

Supply

Voltage

Z1

C1

4.7 nF

VDD

Hall IC

Vss

RL

1.2K

OUT

C2

4.7nF

Two Wire Optional Current

Biasing Circuit

V

DD

IIN

RL Iout

Hall

Rb

IC

US5881 CMOS Multi-Purpose Switch

The resistors R b and RL can be used to bias the input current, IIN. Refer to

the part specification for limiting values. This circuit will help in getting the

precise ON and OFF currents desired.

BRP = Ioff = (VDD / Rb + IDD )

BOP = Ion = (Ioff + VDD / R L )

3901005881 Rev 5.0

24/July/01

Page 5

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