Honeywell HMC1051 HMC1052 handbook
Contents
1. Vcc thf 4 Figure 2 s IRF7509 P V K tH Af G a Dot set reset G Rset reset Vsr K IRF7509 P 3 IRF7509 N l G vV 4 _set reset G m S IRF7509 N V Vsr 2009 s Vcc iuf 4 Figure 3 s __IRF7509 P V K 1uf G is D _ set reset G Rset reset K S 40 IRF7509 N VY Magnetic Field Detection For simple magnetic field sensing applications such Magnetic Anomaly Detectors MADs and Magnetometers a similar circuit to the compass application can be implemented In the example circuit in Figure 4 a HMC1051Z sensor bridge is used with a low voltage capable dual op amp to detect sufficient intensity of a magnetic field Uses of the circuit include ferrous object detection such as vehicle detection a sniffer for moderate currents in nearby conductors and magnetic proximity switching By using two circuits with a HMC1052 a more omni directional sensing pattern can implemented There is nothing special in choosing the resistors for the differential op amp gain stages other than having like values e g the two 5kQ and the 500k resistors matched at 1 tolerance or better to reject common mode interference signals EMI RFI The ratio of the 500kQ 5kQ resistors sets the stage gain and can be optimized for a specific purpose The choice of the 5kQ value sets impedance loading seen by the sensor bridge network and should be about 4 kil2. Figure 1 Vcc inf 500k 2 5 to 3 6v 5 00k LMV358 5 00k U3 Vrefi2 E p enable VW U2 data_out inf 500k m okin 5 00k Vre LMV358 gt 5 00k 500k Vref 2 vV set reset mi lt U4 f set reset 2 IRF750 A U5 offset _set reset Web Sites www magneticsensors com Honeywell www ssec honeywell com Solid State Electronics Center Email ssec customer service honeywell com 12001 State Highway 55 Plymouth Minnesota 55441 4799 2001 HMC1051 1052 Published Jul 2001 Page 4 1 800 323 8295 HMC1051 HMC1052 Honeywell SENSOR PRODUCTS Set Reset Circuit Notes The set reset circuit using the IRF7507 dual complementary MOSFETs is shown in Figure 2 with more detail in its H bridge driven configuration This configuration is used primarily in battery operated applications were the 0 5 ampere nominal set reset pulsed currents are best obtained under low voltage conditions For operation at normal 3 3 or 5 volt logic levels a single complementary MOSFET pair can be used in a single ended circuit shown in Figure 3 Other complementary MOSFET pairs can be used with the caution that the chosen devices should have less than 0 5 ohms ON resistance and be able to handle the needed supply voltages and set reset currents Note that even a 1Hz rate of set reset function draws an average current of less than 2 microamperes Vsr 2002
3. Sites www magneticsensors com Honeywell www ssec honeywell com Solid State Electronics Center Email ssec customer service honeywell com 12001 State Highway 55 Plymouth Minnesota 55441 4799 2001 HMC1051 1052 Published Jul 2001 Page 8 1 800 323 8295
4. 0 0 HMC10510 0 0 HMC1051 HMC1052 Honeywell SENSOR PRODUCTS 1 AND 2 AXIS MAGNETIC SENSORS Features Small 8 Pin SIP or 10 Pin MSOP Packages Two AMR Bridges in One Package Wide Field Range of 6 Gauss 1 0 mV V gauss Sensitivity High Accuracy Compassing Error lt 0 01 Low Power Operation Down to 1 8V Patented On chip Set Reset Straps eoeeeeee Product Description The Honeywell HMC1051Z and HMC1052 are high performance magnetoresistive sensor designs on a single chip The advantages of these patented chips include perfectly orthogonal two axis sensing HMC1052 ultra small size and low power capability in miniature surface mount packages Each of the magnetoresistive sensors are configured as a 4 element wheatstone bridge to convert magnetic fields to differential output voltages Capable of sensing fields below 0 1 milligauss these sensors offer a compact low cost high sensitivity and highly reliable solution for low field magnetic sensing APPLICATIONS e Compassing e Navigation Systems e Attitude Reference e Traffic Detection HMC1052 Circuit Diagram e Medical Devices e Position Sensing Web Sites www magneticsensors com www ssec honeywell com Email ssec customer service honeywell com 2001 HMC1051 1052 Published Jul 2001 Page 1 R set reset S R o A _ S R 6 mee 8 Honeywell Solid State Electronics Center 12001 State Highway 55 Plymouth Minnesota 5544
5. 00 ohms The use of a 9 volt alkaline battery supply permits fairly common operational amplifiers such as the 4558 types to be used Note that the circuit must be calibrated based on the final displacement of the sensed conductor to the measuring bridge Typically an optimally oriented measurement conductor can be placed about one centimeter away from the bridge and have reasonable capability of measuring from tens of milliamperes to beyond 20 amperes of alternating or direct currents See application note AN 209 for the basic principles of current sensing using AMR bridges standoff distance Vcc 9Vde set reset Rp tempco Ra network Figure 5 A R Auf 500k th 5 00k 7 RC4458 i RC4558 output 5 00k ig u2 500k Vcc 2 4 5Vdc HMC1051 Vec 9Vdc Low ESR Tantalum 1uf Sik 2009 set reset offset NV Conductor to be Current Measured Web Sites www magneticsensors com www ssec honeywell com Email ssec customer service honeywell com 2001 HMC1051 1052 Published Jul 2001 Page 6 Si1553DL U3 Honeywell Solid State Electronics Center 12001 State Highway 55 Plymouth Minnesota 55441 4799 1 800 323 8295 HMC1051 HMC1052 Honeywell SENSOR PRODUCTS Three Axis Compassing with Tilt Compensation For full three axis compassing the circuit depicted in Figure 6 shows both a HMC1051Z and a HMC1052 used for sensin
6. 1 4799 1 800 323 8295 HMC1051 HMC1052 Honeywell SENSOR PRODUCTS SPECIFICATIONS Characteristics Conditions Min Typ Max Units Bridge Elements Supply Vbridge referenced to GND 1 8 2 5 20 Volts Resistance Bridge current 1mA 800 1000 1500 ohms Field Range Full scale FS total applied field 6 6 gauss Sensitivity Set Reset Current 0 5A 0 8 1 0 1 2 mV V gauss Bridge Offset Offset OUT OUT 2 5 1 2 5 mV V Field 0 gauss after Set pulse Bandwidth Magnetic signal lower limit DC 5 MHz Noise Density 1kHz Vbridge 5V 50 nV sqrt Hz Resolution 50Hz Bandwidth Vbridge 5V 120 ugauss Disturbing Field Sensitivity starts to degrade 20 gauss Use S R pulse to restore sensitivity Max Exposed No perming effect on zero reading 10000 gauss Field Operating Ambient 40 125 C Temperature Storage Ambient unbiased 55 150 C Temperature Sensitivity Ta 40 to 125 C Vbridge 5V 3200 3000 2800 ppm C Tempco T a 40 to 125 C Ibridge 5mA 600 Bridge Offset T 40 to 125 C No Set Reset 500 ppm C Tempco Ta 40 to 125 C With Set Reset 10 Bridge Ohmic Vbridge 5V Ta 40 to 125 C 2100 2500 2900 ppm C Tempco Sensitivity Ratio of Ta 40 to 125 C 99 101 103 X Y Sensors HMC1052 Only X Y sensor Sensitive direction in X and Y sensors 0 01 degree Orthogonality HMC1052 Linearity Error Best fit straight line 1 gaus
7. B I B HMC ag t 102 a a ie Sa our ae our o j C000 23 4 5 Set Reset Strap S R S R 6 8 Honeywell Solid State Electronics Center 12001 State Highway 55 Plymouth Minnesota 55441 4799 1 800 323 8295 Web Sites www magneticsensors com www ssec honeywell com Email ssec customer service honeywell com 2001 HMC1051 1052 Published Jul 2001 Page 3 HMC1051 HMC1052 Honeywell SENSOR PRODUCTS Basic Device Operation The HMC1051 and HMC1052 are single axis and two axis linear magnetic sensors designed as a Wheatstone bridges formed by a magnetoresistive metal film With the power supply applied to the bridge the sensors converts any incident magnetic field in the sensitive direction to a balanced voltage output The magnetoresistive sensors are made of a nickel iron Permalloy thin film deposited on a silicon wafer in pattern of resistive strips In the presence of a magnetic field a change in the bridge resistive elements causes a corresponding change in voltage across the bridge outputs In addition to the bridge circuits the sensors each have two on chip magnetically coupled straps the Offset Strap and the Set Reset Strap The patented straps eliminate the need for external coils surrounding the bridge elements The offset strap available on bare die only allows for several modes of operation when a direct current is driven through it These modes are 1 Subtraction of an unwanted magnetic field 2 Z
8. ero ing of the bridge offset voltage 3 Closed loop field cancellation and 4 Auto calibration of bridge gain The set reset strap can be pulsed with high currents for the following benefits 1 Enable the sensor to perform high sensitivity measurements 2 Flip the polarity of the bridge output voltage and 3 Periodically used to improve linearity lower cross axis effects and temperature effects Application Notes Low Cost 2 Axis Compass Very high precision measurements can be made using the HMC1051 and HMC1052 sensors when interfaced with low noise amplifiers and 12 to 16 bit Analog to Digital A D converters For lower resolution 1 or low cost compass applications 8 or 10 bit A D converters may be used with general purpose operational amplifiers Figure 1 shows a typical 2 axis compassing application using readily available off the shelf components The basic principle of two axis compassing is to orient the sensor bridge element horizontal to the ground perpendicular to the gravitational field and to measure the X and Y analog voltages With the amplified sensor bridge voltages near simultaneously converted measured to their digital equivalents the arc tangent Y X can be computed to derive the heading information See the application notes on compassing at Honeywell Magnetic Sensors website www magneticsensors com for basic principles and detailed application information
9. g the magnetic field in three axes A two axis accelerometer is also shown to provide pitch and roll tilt sensing to correct the three axis data into to the corrected two axis heading The accelerometer can be substituted with a fluidic 2 axis tilt sensor if desired For lower voltage operation with Lithium battery supplies 2 5 to 3 6Vdc the Set Reset circuit should be upgraded from a single IRF7507 to the dual IRF7507 implementation to permit a minimum 1 0 ampere pulse 0 5 ampere per set reset strap resistance to both the HMC1052 and HMC1051 sensors Figure 6 3 3 to 5 0v ANO AN1 AN2 Vec 2 AN3 set reset DOO U6 LUC with Multiplexed A D Conv Vcc U5 Two axis accelerometer xout DIO yout DI1 Duty Cycling for Lower Energy Consumption For battery powered and other applications needing limited energy consumption the sensor bridge and support electronics can be switched off between magnetic field measurements The HMC1051Z and HMC1052 are very low capacitance Bandwidth gt 5MHz sensor bridges and can stabilize typically before the support electronics can Also minimizing the quantity of set reset pulses will save energy too Figure 7 shows a simple supply switching circuit that can be microprocessor controlled to duty cycle toggle the electronics in moderate current lt 25mA applications Web Sites www magneticsensors com Honeywell www ssec honey
10. o ohms or higher for best voltage transfer or matching Web Sites www magneticsensors com Honeywell www ssec honeywell com Solid State Electronics Center Email ssec customer service honeywell com 12001 State Highway 55 Plymouth Minnesota 55441 4799 2001 HMC1051 1052 Published Jul 2001 Page5 1 800 323 8295 HMC1051 HMC1052 Honeywell Vcc 5 0v set reset SENSOR PRODUCTS i Figure 4 f uf 500k Vee 10kQ pot 5 00k Threshold Set TLCO72 5 00k Z U2 500k TLC072 output Vec 2 gt i e amp HMC1051 LED 10kQ a Vcc RLED Low ESR Tantalum 2009 VW VW 1uf i able 10kQ FMMT717 0 1 uF 1uf A j f H set reset v4 FMMT617 S R offset 0 1 uF 10kQ Alternating or Direct Current Sensing The HMC1051 and HMC1052 sensors can be utilized in a novel way for moderate to high current sensing applications using a nearby external conductor providing the sensed magnetic field to the bridge Figure 5 shows a HMC1051Z used as a current sensor with thermistor element performing a temperature compensation function for greater accuracy over a wide range of operational temps Selection of the temperature compensation tempco resistors used depends on the thermistor chosen and is dependant on the thermistor s C shift of resistance For best op amp compatibility the thermistor resistance should be above about 10
11. s 0 1 3 gauss 0 5 FS 6 gauss 1 8 Hysteresis Error 3 sweeps across 3 gauss 0 06 FS Repeatability Error 3 sweeps across 3 gauss 0 1 FS Tested at 25 C except stated otherwise Web Sites www magneticsensors com Honeywell www ssec honeywell com Email ssec customer service honeywell com 2001 HMC1051 1052 Published Jul 2001 Page 2 Solid State Electronics Center 12001 State Highway 55 Plymouth Minnesota 55441 4799 1 800 323 8295 HMC1051 HMC1052 Honeywell SENSOR PRODUCTS SPECIFICATIONS Characteristics Conditions Min Typ Max Units Set Reset Strap Resistance Measured from S R to S R 3 4 5 ohms Current 0 1 duty cycle or less 0 4 0 5 Amp 2usec current pulse Resistance T a 40 to 125 C 3700 ppm C Tempco Offset Straps available on die Resistance Measured from OFFSET to OFFSET 12 15 18 ohms Offset DC Current 10 mA gauss Constant Field applied in sensitive direction Resistance T a 40 to 125 C 3900 ppm C Tempco Tested at 25 C except stated otherwise Pin Configurations Arrow indicates direction of applied field that generates a positive output voltage after a SET pulse HMC1051 Vec 3 HMC1051Z Pinout H HONEYWELL HMC1051Z BRIDGE A BRIDGE B Vo A GND Piane VO A GND1 B GND2 B 2 4 8 1 5 Set Reset Strap S R S R 6 7 HMC1052 a HMC1052 Pinout HMC1052 10 9 8 7 6 BRIDGE A BRIDGE
12. well com Solid State Electronics Center Email ssec customer service honeywell com 12001 State Highway 55 Plymouth Minnesota 55441 4799 2001 HMC1051 1052 Published Jul 2001 Page7 1 800 323 8295 HMC1051 HMC1052 Honeywell SENSOR PRODUCTS Figure 7 MMBT2907ALT1 To Sensor Circuits 4 0 01 All Used when Vcc 5 0 volts jumper when using Vcc 3 3 volts or less MMBD7001LT1 10kQ PACKAGE DRAWING 8 PIN SIP Symbol Millimeters Inches x 10E 3 Min Max Min Max A 1 371 1 728 54 68 Al 0 101 0 249 4 10 B 0 355 0 483 14 19 D 9 829 11 253 387 443 E 3 810 3 988 150 157 e 1 270 ref 50 ref H 6 850 7 300 270 287 h 0 381 0 762 15 30 PACKAGE DRAWING 10 PIN MSOP Symbol Millimeters Inches x 10E 3 Min Max Min Max A 1 10 43 lt A1 Al 0 05 0 15 2 0 5 9 B 0 15 0 30 5 9 11 8 D 2 90 3 10 114 122 El 2 90 3 10 114 122 E j e 0 50 BSC 2 0 BSC E 4 75 5 05 187 199 t Ll 0 95 BSC 37 4 e c e gt lt b Ordering Information Ordering Number Product HMC1051Z One Axis Magnetic Sensor SIP8 Package HMC1052 Two Axis Magnetic Sensors MSOP8 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 Web
Download Pdf Manuals
Related Search