HMC2003

HMC2003 SENSOR PRODUCTS THREE-AXIS MAGNETIC SENSOR HYBRID Features • • • • • • • • • 20-pin Wide DIP Footprint (1” by 0.75”) Precision 3-axis Capability Factory Calibrated Analog Outputs 40 micro-gauss to ±2 gauss Dynamic Range Analog Output at 1 Volt/gauss (2.5V @ 0 gauss) Onboard +2.5 Volt Reference +6 to +15 Volt DC Single Supply Operation Very Low Magnetic Material Content -40° to 85°C Operating Temperature Range General Description The Honeywell HMC2003 is a high sensitivity, threeaxis magnetic sensor hybrid assembly used to measure low magnetic field strengths. Honeywell’s most sensitive magneto-resistive sensors (HMC1001 and HMC1002) are utilized to provide the reliability and precision of this magnetometer design. The HMC2003 interface is all analog with critical nodes brought out to the pin interfaces for maximum user flexibility. The internal excitation current source and selected gain and offset resistors, reduces temperature errors plus gain and offset drift. Three precision low-noise instrumentation amplifiers with 1kHz low pass filters provide accurate measurements while rejecting unwanted noise. APPLICATIONS • Precision Compassing • Navigation Systems • Attitude Reference • Traffic Detection • Proximity Detection • Medical Devices Solid State Electronics Center • www.magneticsensors.com • (800) 323-8295 • Page 1 BLOCK DIAGRAM HMC2003 SENSOR PRODUCTS SPECIFICATIONS Characteristics Conditions(1) Min Typ Max Units(2) Sensitivity 0.98 1 1.02 V/gauss Null Field Output 2.3 2.5 2.7 V Magnetic Field Resolution µgauss 40 Field Range Maximum Magnetic Flux Density -2 2 Output Voltage Each Magnetometer Axis Output 0.5 4.5 Bandwidth 1 gauss kHz Errors ±1 gauss Applied Field Sweep 0.5 2 ±2 gauss Applied Field Sweep 1 2 Hysteresis Error 3 Sweeps across ±2 gauss 0.05 0.1 %FS Repeatability Error 3 Sweeps across ±2 gauss 0.05 0.1 %FS 0.1 %FS 10.5 ohms 48.5 mA/gauss 200 mA 4.5 6 ohms 3.2 5 amps Linearity Error Power Supply Effect PS Varied from 6 to 15V %FS With ±1 gauss Applied Field Sweep Offset Strap Resistance Sensitivity 46.5 47.5 Current Set/Reset Strap Resistance Current 2msec pulse, 1% duty cycle 3.0 Tempcos Field Sensitivity Null Field -600 ppm/°C Set/Reset Not Used ±400 ppm/°C Set/Reset Used ±100 Environments Temperature Operating -40 - +85 °C Storage -55 - +125 °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 = 25°C, 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. Solid State Electronics Center • www.magneticsensors.com • (800) 323-8295 • Page 2 HMC2003 SENSOR PRODUCTS General Description 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. hardiron 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 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 Ordering Information Ordering Number HMC2003 Product Three-Axis Magnetic Sensor Hybrid Solid State Electronics Center • www.magneticsensors.com • (800) 323-8295 • Page 3 Inches Min Max 0.43 0.47 0.115 0.135 1.02 1.075 0.095 0.105 0.71 0.775 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 02-04 Rev. E Solid State Electronics Center • www.magneticsensors.com • (800) 323-8295 • Page 4