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HMC1051 / HMC1052
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 <0.01) Low Power Operation Down to 1.8V Patented On-chip Set/Reset Straps
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 * Compassing * Navigation Systems * Attitude Reference * Traffic Detection * Medical Devices * 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 Honeywell Solid State Electronics Center 12001 State Highway 55 Plymouth, Minnesota 55441-4799 1-800-323-8295
HMC1052 Circuit Diagram
HMC1051 / HMC1052
SENSOR PRODUCTS SPECIFICATIONS Characteristics Bridge Elements Supply Resistance Field Range Sensitivity Bridge Offset Bandwidth Noise Density Resolution Disturbing Field Max. Exposed Field Operating Temperature Storage Temperature Sensitivity Tempco Bridge Offset Tempco Bridge Ohmic Tempco Sensitivity Ratio of X,Y Sensors (HMC1052 Only) X,Y sensor Orthogonality (HMC1052) Linearity Error Best fit straight line +/- 1 gauss +/- 3 gauss +/- 6 gauss Hysteresis Error 3 sweeps across +/-3 gauss Repeatability Error 3 sweeps across +/-3 gauss * Tested at 25C except stated otherwise.
Web Sites: www.magneticsensors.com www.ssec.honeywell.com Email: ssec.customer.service@honeywell.com 2001 HMC1051/1052 Published Jul 2001 Page 2
Conditions*
Min
Typ
Max
Units
Vbridge referenced to GND Bridge current = 1mA Full scale (FS) - total applied field Set/Reset Current = 0.5A Offset = (OUT+) - (OUT-) Field = 0 gauss after Set pulse Magnetic signal (lower limit = DC) @ 1kHz, Vbridge=5V 50Hz Bandwidth, Vbridge=5V Sensitivity starts to degrade. Use S/R pulse to restore sensitivity. No perming effect on zero reading Ambient Ambient, unbiased TA=-40 to 125C, Vbridge=5V TA=-40 to 125C, Ibridge=5mA TA=-40 to 125C, No Set/Reset TA=-40 to 125C, With Set/Reset Vbridge=5V, TA=-40 to 125C TA=-40 to 125C
1.8 800 -6 0.8 -2.5
2.5 1000 1.0 +/-1 5 50 120
20 1500 +6 1.2 +2.5
Volts ohms gauss mV/V/gauss mV/V MHz nV/sqrt Hz mgauss gauss
20 10000 -40 -55 -3200 -3000 -600 +/-500 +/-10 2100 99 2500 101 2900 103 125 150 -2800
gauss C C ppm/C ppm/C ppm/C %
Sensitive direction in X and Y sensors
0.01
degree
0.1 0.5 1.8 0.06 0.1 %FS %FS %FS
Honeywell Solid State Electronics Center 12001 State Highway 55 Plymouth, Minnesota 55441-4799 1-800-323-8295
HMC1051 / HMC1052
SENSOR PRODUCTS SPECIFICATIONS Characteristics Set/Reset Strap Resistance Current Resistance Tempco Offset Straps Resistance Offset Constant Resistance Tempco * Tested at 25C except stated otherwise. (available on die) Measured from OFFSET+ to OFFSETDC Current Field applied in sensitive direction TA=-40 to 125C 3900 ppm/C 12 15 10 18 ohms mA/gauss Measured from S/R+ to S/R0.1% duty cycle, or less, 2msec current pulse TA=-40 to 125C 3700 ppm/C 3 0.4 4 0.5 5 4 ohms Amp Conditions* Min Typ Max Units
Pin Configurations
HMC1051
(Arrow indicates direction of applied field that generates a positive output voltage after a SET pulse.)
Vcc (3)
HMC1051Z Pinout
HONEYWELL HMC1051Z
BRIDGE B
HMC1051
BRIDGE A
12345678
Vo+(A) (2) GND Plane (4) Vo-(A) (8) GND1(B) GND2(B) (1) (5)
Set/Reset Strap S/R+ (6) S/R(7)
HMC1052
Vcc (5)
HMC1052 Pinout
10 9 8 7 6
HMC1052
BRIDGE A
BRIDGE B
B
HMC 1052
OUT(10) GND2 GND1 (3) (9) OUT+ (4) OUT(7) GND (1) OUT+ (2)
A
Set/Reset Strap S/R+ (6) S/R(8)
1
2
3
4
5
Web Sites:
www.magneticsensors.com www.ssec.honeywell.com Email: ssec.customer.service@honeywell.com 2001 HMC1051/1052 Published Jul 2001 Page 3
Honeywell Solid State Electronics Center 12001 State Highway 55 Plymouth, Minnesota 55441-4799 1-800-323-8295
HMC1051 / HMC1052
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) Zero-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.
U1
2.5 to 3.6v
Figure 1
1nf 5.00k 5.00k 500k Vref/2 500k
Vcc
LMV358
U3 U2
500k 1 0 Vref
LMV358
enable
MAX1118
data_out clk_in
HMC1052 1nf 5.00k 5.00k 500k Vref/2 set/reset .1uf (2) IRF7507 offset
U4 U5
set/reset
_set/reset
Web Sites:
www.magneticsensors.com www.ssec.honeywell.com Email: ssec.customer.service@honeywell.com 2001 HMC1051/1052 Published Jul 2001 Page 4
Honeywell Solid State Electronics Center 12001 State Highway 55 Plymouth, Minnesota 55441-4799 1-800-323-8295
HMC1051 / HMC1052
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 Hbridge 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 1mf + S IRF7509(P) 200W Vcc
Figure 2
.1mf D D Rset/reset S 4W G D D G Vsr IRF7509(P) S
G set/reset G
IRF7509(N)
_set/reset
S
IRF7509(N)
Vsr 1mf + S
200W IRF7509(P)
Vcc
Figure 3
.1mf D D Rset/reset S
G set/reset G
4W
IRF7509(N)
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 5kW and the 500kW resistors) matched at 1% tolerance or better to reject common-mode interference signals (EMI, RFI). The ratio of the 500kW/5kW resistors sets the stage gain and can be optimized for a specific purpose. The choice of the 5kW value sets impedance loading seen by the sensor bridge network and should be about 4 kilo-ohms or higher for best voltage transfer or matching.
Web Sites: www.magneticsensors.com www.ssec.honeywell.com Email: ssec.customer.service@honeywell.com 2001 HMC1051/1052 Published Jul 2001 Page 5 Honeywell Solid State Electronics Center 12001 State Highway 55 Plymouth, Minnesota 55441-4799 1-800-323-8295
HMC1051 / HMC1052
SENSOR PRODUCTS
U1
Vcc
5.0v
Figure 4
.1mf 5.00k 5.00k 500k Vcc/2 500k
Vcc 10kW pot Threshold Set
+
TLC072
U2
+
TLC072
output LED
HMC1051 Vcc * Low ESR Tantalum 1mf* -+ FMMT717 set/reset .1uf FMMT617 offset 10kW 0.1mf 10kW 0.1mf 200W
10kW RLED
set/reset S R
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 1000 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 Rb
tempco network
Ra
Vcc = 9Vdc
U1
Figure 5
.1mf 5.00k 5.00k 500k Vcc/2 ~ +4.5Vdc 500k
Rth - RC4458 + output
- RC4558 +
U2
HMC1051 Vcc =9Vdc * Low ESR Tantalum 1mf* 200W
Iac Idc
set/reset .1uf
-+
set/reset Si1553DL
offset
U3
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
Honeywell Solid State Electronics Center 12001 State Highway 55 Plymouth, Minnesota 55441-4799 1-800-323-8295
HMC1051 / HMC1052
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 sensing 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
1nf 500k Vcc 5.00k
LMV324
U1
Vcc
3.3 to 5.0v
AN0 AN1
5.00k 500k Vcc/2 HMC1052 1nf 500k
U3
Vcc/2
AN2 AN3
set/reset DO0
5.00k
LMV324
U6
5.00k 500k Vcc/2 set/reset .1uf
U4
IRF7507 Vcc
with Multiplexed A/D Conv.
U5
mC
offset
set/reset .1mf Two-axis accelerometer
Vcc
500k
U2
5.00k 5.00k 500k Vcc/2 HMC1051 - LMV324 + xout yout DI0 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 > 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 (<25mA) applications.
Web Sites: www.magneticsensors.com www.ssec.honeywell.com Email: ssec.customer.service@honeywell.com 2001 HMC1051/1052 Published Jul 2001 Page 7 Honeywell Solid State Electronics Center 12001 State Highway 55 Plymouth, Minnesota 55441-4799 1-800-323-8295
HMC1051 / HMC1052
SENSOR PRODUCTS
Figure 7
To Sensor Circuits 0.01mf + 10mf Vcc MMBT2907ALT1 Vcc Gnd
* Used when Vcc = 5.0 volts, jumper when using Vcc = 3.3 volts or less.
*MMBD7001LT1 Off On 10kW
mC
toggle
PACKAGE DRAWING 8-PIN SIP
Symbol A A1 B D E e H h Millimeters Min Max 1.371 1.728 0.101 0.249 0.355 0.483 9.829 11.253 3.810 3.988 1.270 ref 6.850 7.300 0.381 0.762 Inches x 10E-3 Min Max 54 68 4 10 14 19 387 443 150 157 50 ref 270 287 15 30
Symbol A A1 B D E1 e E L1
Millimeters Min Max 1.10 0.05 0.15 0.15 0.30 2.90 3.10 2.90 3.10 0.50 BSC 4.75 5.05 0.95 BSC
Inches x 10E-3 Min Max 2.0 5.9 114 114 2.0 BSC 187 37.4 43 5.9 11.8 122 122 199
Ordering Information
Ordering Number
HMC1051Z HMC1052
Product
One Axis Magnetic Sensor - SIP8 Package 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 Sites: www.magneticsensors.com www.ssec.honeywell.com Email: ssec.customer.service@honeywell.com 2001 HMC1051/1052 Published Jul 2001 Page 8 Honeywell Solid State Electronics Center 12001 State Highway 55 Plymouth, Minnesota 55441-4799 1-800-323-8295

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