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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 Magnetic Field Sensitivity Null Field Output Resolution Field Range Output Voltage Bandwidth Errors Linearity Error Hysteresis Error Repeatability Error Power Supply Effect Offset Strap Resistance Sensitivity Current Set/Reset Strap Resistance Current Tempcos Field Sensitivity Null Field Environments Temperature Shock Vibration 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. Operating Storage -40 -55 100 2.2 +85 +125 C C g g rms Set/Reset Not Used Set/Reset Used -600 400 100 ppm/C ppm/C 2msec pulse, 1% duty cycle 3.0 4.5 3.2 6 5 ohms amps 46.5 47.5 10.5 48.5 200 ohms mA/gauss mA 1 gauss Applied Field Sweep 2 gauss Applied Field Sweep 3 Sweeps across 2 gauss 3 Sweeps across 2 gauss PS Varied from 6 to 15V With 1 gauss Applied Field Sweep 0.5 1 0.05 0.05 2 2 0.1 0.1 0.1 %FS %FS %FS %FS Maximum Magnetic Flux Density Each Magnetometer Axis Output -2 0.5 1 0.98 2.3 1 2.5 40 2 4.5 kHz 1.02 2.7 V/gauss V gauss gauss Conditions(1) Min Typ Max Units(2)
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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 frontend. 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
HMC2003
Product
Three-Axis Magnetic Sensor Hybrid
Solid State Electronics Center * www.magneticsensors.com * (800) 323-8295 * Page 3
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. 900151 04-03 Rev. D
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