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SENSOR PRODUCTS APPLICATIONS Linear Displacement Angular Displacement Motor Control Valve Position Proximity Detection Current Spike Detection Linear / Angular / Rotary Displacement Sensors HMC1501 / HMC1512 H Not actual size igh resolution, low power MR sensor capable of measuring the angle direction of a magnetic field from a magnet with <0.07 resolution. Advantages of measuring field direction versus field strength include: insensitivity to the tempco of the magnet, less sensitivity to shock and vibration, and the ability to withstand large variations in the gap between the sensor and magnet. These sensors may be operated on 3 volts with bandwidth response of 0-5 MHz. Output is typical Wheatstone bridge. FEATURES AND BENEFITS No Rare Earth Magnets Unlike Hall effect devices which may require samarium cobalt or similar "rare earth" magnets, the HMC1501 and HMC1512 can function with Alnico or ceramic type magnets. HMC1501--Angular range of 45 with <0.07 resolution. HMC1512--Angular range of 90 with <0.05 resolution. Linear range of 8mm with two sensors mounted on two ends; range may be increased through multiple sensor arrays operating together. Unlike incremental "encoding" devices, sensors know the exact position and require no indexing for proper positional output. No moving parts to wear out; no dropped signals from worn tracks as in conventional contact based rotary sensors. Available in an 8-pin surface mount package with case dimensions (exclusive of pins), of 5mm x 4mm x 1.2mm total mounting envelope, with pins of less than 6mm square. Full Scale output range of 120mV with 5V of power supply. Wide Angular Range Effective Linear Range Absolute Sensing Non-Contact Sensing Small Package Large Signal Output HMC1501 / HMC1512 PRINCIPLES OF OPERATION Anisotropic magnetoresistance (AMR) occurs in ferrous materials. It is a change in resistance when a magnetic field is applied in a thin strip of ferrous material. The magnetoresistance is a function of cos2 where is the angle between magnetization M and current flow in the thin strip. When an applied magnetic field is larger than 80 Oe, the magnetization aligns in the same direction of the applied field; this is called saturation mode. In this mode, is the angle between the direction of applied field and the current flow; the MR sensor is only sensitive to the direction of applied field. The sensor is in the form of a Wheatstone bridge (Figure 1). The resistance R of all four resistors is the same. The bridge power supply VS causes current to flow through the resistors, the direction as indicated in the figure for each resistor. Both HMC1501 and HMC1512 are designed to be used in saturation mode. HMC1501 contains one MR bridge and HMC1512 has two identical MR bridges, coexisting on a single die. Bridge B physically rotates 45 from bridge A. The HMC1501 has sensor output V=-VSS sin (2) and the HMC1512 has sensor output V=VSS sin (2) for sensor A and sensor B output VS=-VSS cos (2), where VS is supply voltage, S is a constant, determined by materials. For Honeywell sensors, S is typically 12mV/V. Current Flow SENSOR PRODUCTS Metal Contact M Applied Field Applied Field Direction Permalloy Thin Film (NiFe) M R+R V +M R-R M R-R I Vs M R+R Figure 1 PINOUT DRAWINGS HMC1501 OUT+ 1 GND 1 2 3 4 HMC1512 8 OUT7 GND 2 6 5 VBRIDGE OUT- A OUT- B VBRIDGEB VBRIDGEA 1 2 3 4 * * 8 7 6 5 GNDA GNDB OUT+ B OUT+ A Caution: Do not connect GND or Power to Pin 3,4 &6. MR SENSOR CIRCUITS VBRIDGE VBRIDGE A OUT +B R R R OUTOUT+ A R GND A R R R Bridge A VBRIDGE B OUT+ OUTA R GND B Bridge B R R GND 1 R GND 2 R OUT -B 2 HMC1501 / HMC1512 TYPICAL SENSOR OUTPUT HMC1501 output voltage vs. magnetic field angle 60 40 20 0 -20 0 -40 -60 -80 -100 SENSOR PRODUCTS HMC1512 output voltage vs. magnetic field angle 100 Sensor Output (mV) Sensor Output (mV) 50 0 0 -50 -100 Theta (degree) 100 200 300 400 100 200 300 400 Theta (degree) Bridge A Bridge B B A APPLICATION CONFIGURATION Proximity Position Linear Position Moving Direction Valve Actuator Stem S N N Moving Direction Reference Direction ~0.5 to -1.5 inches Rotary Position HMC1501/1512 MR Sensor Magnet Magnet N S S N N S Rotating Shaft Rotating Shaft PACKAGE DRAWING 8-Pin SOIC D A1 A H E Symbol A A1 B D E e H h Millimeters Min Max 1.371 1.728 0.101 0.249 0.355 0.483 4.800 4.979 3.810 3.988 1.270 ref 5.816 6.198 0.381 0.762 Inches Max Min .068 .054 .010 .004 .019 .014 .196 .189 .157 .150 .050 ref .244 .229 .030 .015 * e B h x 45 1 3 HMC1501 / HMC1512 SPECIFICATIONS Characteristics Bridge supply Bridge resistance Angle range Conditions* Min Vbridge referenced to GND Bridge current--1 mA > Saturation field Vbridge = 5V, field 80 Oe, (1) @ zero crossing (2) @ Zero crossing, averaged in the range of 45 Vbridge = 5V, field = 80 Oe Field 80 Oe, =0 Bridge A Bridge B 100 -7 80 0 0.07 30 1.7x10-2 0.28 -0.32 -0.01 10 0 5 5 1 4 -45 2.1 1.8 120 3 140 7 100 0 -4 80 0 HMC1501 Typ Max 5 5 25 6.5 +45 Min 1 2.0 -90 SENSOR PRODUCTS HMC1512 Typ Max 5 2.1 25 2.8 +90 2.1 1.8 120 2. 5 0 140 5 1 Units V K deg Sensitivity mV/ Peak -to-peak Voltage Bridge offset Saturation field Bandwidth Resolution Hysteresis error Bridge tempco Sensitivity tempco Bridge offset tempco Noise Density Power Consumption mV mV/V G Repeatability <0.03% FS Magnetic signal Bandwidth =10Hz,Vbridge =5V Magnetic field >saturation field, Vbridge = 5V TA = -40 C to +125 C TA = -40 C to +125 C Vbridge = 5V TA = -40 C to +125 C Noise at 1Hz, Vbridge = 5V Vbridge = 5V 5 0.05 30 1.7x10-2 0.28 -0.32 -0.01 70 23 MHz V deg %/ C %/ C %/ C, FS nV Hz mW *Tested at 25C except stated otherwise. Sensitivity tempco Cs = St-So = -0.32%/C So*t Where So = sensitivity at zero temperature t = temperature in the range -40C to 125C St = sensitivity at temperature t Offset tempco Co = Vo (t) - Vo (o) = -0.01%/C VP-P*t Where Vo (o) = bridge offset at zero temperature VP-P = peak-to-peak voltage t = temperature in the range -40C to 125C Vo (t) = offset at temperature t Power consumption P = Where V2 R 1 KA/m = 12.5 Gauss 1 Tesla = 104 Gauss V = Bridge supply voltage R = Bridge resistance Honeywell reserves the right to make changes to any products or technology herein 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. Solid State Electronics Center 12001 State Highway 55 Plymouth, MN 55441 1-800-323-8295 http://www.ssec.honeywell.com 900246 8-00 Rev. B 4 |
Price & Availability of HMC1501 |
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