HMC2003
SENSOR PRODUCTS
THREE-AXIS MAGNETIC SENSOR HYBRID
Features
DIP-20 Footprint (1" by 0.75")
3-axis Capability
Solid-State Design
40 micro-gauss to 2 gauss Dynamic Range
Analog Output at 1 Volt per gauss
-40 to 85C Operating Temperature Range
Onboard +2.5 Volt Reference
6 to 15 volt DC Single Supply Operation
Low Magnetic Material Content
General Description
The Honeywell HMC2003 is a three-axis magnetic
sensor hybrid assembly used to measure low magnetic
field strengths. Honeywell's most sensitive
magnetoresistive sensors (HMC1001, HMC1002) are
utilized to provide the reliability and accuracy of this
magnetometer design. The HMC2003 interface is all
analog with critical nodes brought out to the pin
interface for maximum user flexibility. The internal
excitation current source reduces temperature errors
and regulates the sensor bridge voltages. Three
precision low-noise instrumentation amplifiers with
1kHz low pass filters provide repeatable measurements
while rejecting unwanted noise.
APPLICATIONS
BLOCK DIAGRAM
Precision Compassing
Navigation Systems
Attitude Reference
Traffic Detection
Proximity Detection
Medical Devices
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HMC2003
SENSOR PRODUCTS
SPECIFICATIONS
Characteristics
Conditions
(1)
Min
Typ
Max
Units
(2)
Magnetic Field
Sensitivity
0.98
1
1.02
V/gauss
Null Field Output
2.3
2.5
2.7
V
Resolution
40
gauss
Field Range
Maximum Magnetic Flux Density
-2
2
gauss
Output Voltage
Each Magnetometer Axis Output
0.5
4.5
Bandwidth
1
kHz
Errors
Linearity Error
1 gauss Applied Field Sweep
2 gauss Applied Field Sweep
0.5
1
2
2
%FS
Hysteresis Error
3 Sweeps across 2 gauss
0.05
0.1
%FS
Repeatability Error
3 Sweeps across 2 gauss
0.05
0.1
%FS
Power Supply Effect
PS Varied from 6 to 15V
With 1 gauss Applied Field Sweep
0.1
%FS
Offset Strap
Resistance
10.5
ohms
Sensitivity
46.5
47.5
48.5
mA/gauss
Current
200
mA
Set/Reset Strap
Resistance
4.5
6
ohms
Current
2msec pulse, 1% duty cycle
3.0
3.2
5
amps
Tempcos
Field Sensitivity
-600
ppm/C
Null Field
Set/Reset Not Used
Set/Reset Used
400
100
ppm/C
Environments
Temperature
Operating
Storage
-40
-55
-
-
+85
+125
C
C
Shock
100
g
Vibration
2.2
g rms
Electrical
Supply Voltage
(3)
6
15
VDC
Supply Current
20
mA
(1) Unless otherwise stated, test conditions are as follows: Power Supply = 12VDC, Ambient Temp = 25C,
Set/Reset switching is active
(2) Units: 1 gauss = 1 Oersted (in air) = 79.58 A/m = 10E5 gamma
(3) Transient protection circuitry should be added across V+ and Gnd if an unregulated power supply is used.
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HMC2003
SENSOR PRODUCTS
General Description
Honeywell's three axis magnetic sensor hybrid uses three permalloy magnetoresistive sensors and custom interface
electronics to measure the strength and direction of a 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, 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 in. x 0.75 in.) and has an on-chip 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 tight size constraints and/or have their own electronics and only need a magnetic transducer 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 bridge circuits, are magnetically coupled straps that replace the need for external coils and
provide various modes of operation. The Honeywell patented field offset straps (Xoff+ and Xoff-, etc.) can be used
electrically to apply a magnetic field to the bridge to buck, or offset an applied field. This technique can be used to
cancel unwanted ambient magnetic fields or in a closed loop field nulling measurement circuit. The offset straps
nominally provide a 1 gauss field along the sensitive axis per 48mA of offset current through it.
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
Product
HMC2003
Three-Axis Magnetic Sensor Hybrid
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HMC2003
SENSOR PRODUCTS
Honeywell reserves the right to make changes to improve reliability, function or design. Honeywell does not assume
any liability arising out of the application or use of any product or circuit described herein; neither does it convey any
license under its patent rights nor the rights of others.
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900151 04-03 Rev. D
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