HMC2003 Datasheet, PDF (3/4 Pages) Honeywell Solid State Electronics Center – THREE-AXIS MAGNETIC SENSOR HYBRID

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 • [phone] • Page 3