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HMC2003

THREE-AXIS MAGNETIC SENSOR HYBRID

Honeywell International 

HMC2003

General Description

SENSOR PRODUCTS

Honeywell’s three axis magnetic sensor hybrid uses three permalloy magneto-resistive sensors and custom interface

electronics to measure the strength and direction of an incident magnetic field. These sensors are sensitive to

magnetic fields along the length, width, and height (X, Y, Z axis) of the 20-pin dual-in-line hybrid. Fields can be

detected less than 40 microgauss and up to ±2 gauss. Analog outputs are available for each X, Y and Z axis from the

hybrid. With the sensitivity and linearity of this hybrid, changes can be detected in the earth’s magnetic field to

provide compass headings or attitude sensing. The high bandwidth of this hybrid allows for anomaly detection of

vehicles, planes, and other ferrous objects at high speeds.

The hybrid is packaged on a small printed circuit board (1” by 0.75”) and has an on-chip +2.5 voltage reference that

operates from a single 6 to 15V supply. The hybrid is ideal for applications that require two- or three-axis magnetic

sensing and have size constraints and need a magnetic transducer (magnetometer) front-end. Note that the hybrid’s

resistor values will vary, or an abscense of some resistor components, is likely due to individual factory calibration.

Integrated with the sensor elements composed of wheatstone bridge circuits, are magnetically coupled straps that

replace the need for external field coils and provide various modes of operation. The Honeywell patented integrated

field offset straps (Xoff+ and Xoff-, etc.) can be used electrically to apply local magnetic fields to the bridges to buck,

or offset an applied incident field. This technique can be used to cancel unwanted ambient magnetic fields (e.g. hard-

iron magnetism) or in a closed loop field nulling measurement circuit. The offset straps nominally provide 1 gauss

fields along the sensitive axis per 48mA of offset current through each strap.

The HMC2003’s magnetic sensors can be affected by high momentary magnetic fields that may lead to output signal

degradation. In order to eliminate this effect, and maximize the signal output, a magnetic switching technique can be

applied to the bridge using set/reset pins (SR+ and SR-) that eliminates the effect of past magnetic history. Refer to

the application notes that provide information on set/reset circuits and operation.

Pinout Diagram and Package Drawing

Ordering Information

Ordering Number

HMC2003

Symbol

A

A1

D

e

H

Millimeters

Min

Max

10.92 11.94

2.92 3.42

25.91 27.30

2.41 2.67

18.03 19.69

Inches

Min Max

0.43 0.47

0.115 0.135

1.02 1.075

0.095 0.105

0.71 0.775

Product

Three-Axis Magnetic Sensor Hybrid

Solid State Electronics Center • www.magneticsensors.com • (800) 323-8295 • Page 3

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