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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

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