3-Axis Magnetic Sensor
HMC1043
The Honeywell HMC1043 is a miniature three-axis surface mount sensor array
designed for low field magnetic sensing. By adding the HMC1043 with
supporting signal processing, a cost effective and space-efficient 3-axis
magnetometer or compassing solution is enabled. This ultra-compact, low cost
solution is easy to assemble for high volume OEM designs. Applications for the
HMC1043 include Compassing, Navigation Systems, Magnetometry, and
Current Sensing.
Advanced Information
The HMC1043 utilizes Honeywell’s Anisotropic Magnetoresistive (AMR)
technology that provides advantages over coil based magnetic sensors. They
are extremely sensitive, low field, solid-state magnetic sensors designed to
measure direction and magnitude of Earth’s magnetic fields, from tens of micro-gauss to 6 gauss. Honeywell’s Magnetic
Sensors are among the most sensitive and reliable low-field sensors in the industry.
Honeywell continues to maintain product excellence and performance by introducing innovative solid-state magnetic
sensor solutions. These are highly reliable, top performance products that are delivered when promised. Honeywell’s
magnetic sensor solutions provide real solutions you can count on.
FEATURES
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Low Height Magnetic Sensors (1.40mm)
Surface Mount Three-Axis Sensors
Low Voltage Operations (2.0V)
Low Cost
Available in Tape & Reel Packaging
Lead Free Package Construction
4-Element Wheatstone Bridges
Wide Magnetic Field Range (+/-6 Oe)
Patented Offset and Set/Reset Straps
BENEFITS
and Small Size for Low Profile Vertical Sensing
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Narrow DimensionsMounting, No Layout Constraints
Applications and
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Easy to Assemble & Compatible with High Speed SMT Assembly
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Compatible for Battery Powered Applications
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Designed for High Volume, Cost Effective OEM Designs
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High Volume OEM Assembly
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Complies with Current Environmental Standards
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Low Noise Passive Element Design
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Sensor Can Be Used in Strong Magnetic Field Environments
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Stray Magnetic Field Compensation
HMC1043
SPECIFICATIONS
Characteristics
Bridge Elements
Supply
Resistance
Vbridge referenced to GND
Bridge current = 10mA
per bridge
measured Vb to Vss
Ambient
Ambient, unbiased
Tested at 85°C
Full scale (FS) – total applied field
Best fit straight line
± 1 gauss
± 3 gauss
± 6 gauss
3 sweeps across ±3 gauss
3 sweeps across ±3 gauss
Offset = (OUT+) – (OUT-)
Field = 0 gauss after Set pulse
Set/Reset Current = 0.5A
@ 1kHz, Vbridge=5V
50Hz Bandwidth, Vbridge=5V
Magnetic signal (lower limit = DC)
Sensitivity starts to degrade.
Use S/R pulse to restore sensitivity.
T
A
= -40 to 125°C, Vbridge=5V
T
A
= -40 to 125°C, Ibridge=5mA
T
A
= -40 to 125°C, No Set/Reset
T
A
= -40 to 125°C, With Set/Reset
Vbridge=5V, T
A
= -40 to 125°C
Cross field = 1 gauss, Happlied = ±1 gauss
No perming effect on zero reading
X toY sensors
X to Z or Y to Z
2100
20
-3000
-2700
-600
±500
±10
2500
±0.3
10000
0.01
1
2900
-2400
-1.25
0.8
-6
0.1
0.5
1.8
0.06
0.1
±0.5
1.0
50
120
5
+1.25
1.2
1.8
800
265
-40
-55
3.0
1000
333
20
1500
500
125
150
85
+6
Volts
ohms
ohms
°C
°C
%
gauss
%FS
%FS
%FS
mV/V
mV/V/gauss
nV/sqrt Hz
µgauss
MHz
gauss
ppm/°C
ppm/°C
ppm/°C
%FS
gauss
degree
Conditions*
Min
Typ
Max
Units
Operating Temperature
Storage Temperature
Humidity
Field Range
Linearity Error
Hysteresis Error
Repeatability Error
Bridge Offset
Sensitivity
Noise Density
Resolution
Bandwidth
Disturbing Field
Sensitivity Tempco
Bridge Offset Tempco
Bridge Ohmic Tempco
Cross-Axis Effect
Max. Exposed Field
X,Y, Z sensor
Orthogonality
Set/Reset Straps
Resistance
Current
Resistance Tempco
Offset Straps
Resistance
Offset Constant
Measured from S/R+ to S/R-
0.1% duty cycle, or less, 2µsec current pulse
T
A
= -40 to 125°C
1.5
0.8
3300
2.5
1.0
3700
3
8
4100
ohms
Amp
ppm/°C
Measured from OFFSET+ to OFFSET-
DC Current
Field applied in sensitive direction
10
13
10
16
ohms
mA/gauss
Resistance Tempco
T
A
= -40 to 125°C
* Tested at 25°C except stated otherwise.
3500
3900
4300
ppm/°C
2
www.honeywell.com
HMC1043
SCHEMATIC DIAGRAM
VB (12)
OUT- X
(15)
OUT+ X
(3)
OUT- Y
(1)
OUT+ Y OUT- Z
(10)
(6)
OUT+ Z
(11)
VSS
(2)
OFF- XY
(4)
OFF- Z
(13)
OFF+ XY
(16)
OFF+ Z
(14)
SR-
(7)
SR+
(5)
PIN CONFIGURATIONS
(Arrow indicates direction of applied field that generates a positive output voltage after a SET pulse.)
Pin Number
1
2
3
4
5
6
7
8
Function
OUT- Y
VSS
OUT+ X
OFF- XY
SR+
OUT+ Y
SR-
NC
Pin Number
9
10
11
12
13
14
15
16
Function
NC
OUT- Z
OUT+ Z
VB
OFF- Z
OFF+ Z
OUT-X
OFF+ XY
6 OUT+ Y
7 SR-
5 SR+
8 NC
8 NC
8 NC
4 OFF- XY
3 OUT+ X
2 VSS
1 OUT- Y
X
Y
9 NC
10 OUT- Z
Z
11 OUT+ Z
12 VB
HMC1043
BOTTOM SIDE
15 OUT- X
14 OFF+ Z
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16 OFF+ XY
13 OFF- Z
13 OFF- Z
13 OFF- Z
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HMC1043
PACKAGE OUTLINE
PACKAGE DRAWING HMC1043 (16-PIN LPCC, dimensions in millimeters)
3.00
0.40
0.23 (16)
HMC1043 BOTTOM VIEW
MOUNTING CONSIDERATIONS
The following is the recommend printed circuit board (PCB) footprint for the HMC1043.
Each of the sixteen pads on the HMC1043 is spaced on 0.5mm centers with 4 pads per side. Each pad is nominally
0.23mm by 0.40mm with a tin over copper finish. Recommended PCB lands for the HMC1043 are outsized to 0.28mm by
0.65mm for 0.025mm sides plus 0.05mm inside and 0.20mm outside areas. The extra area is for good reflow attachment
and enough pad contact exposure for test probing if necessary.
1.50
0.25
0.25
0.50
3.00
3.00
NOMINAL PAD SIZE 0.40 X 0.23 MM
0.05
0.20
NOMINAL LAND SIZE 0.65 X 0.28MM
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HMC1043
Stencil Design and Solder Paste
A 4 mil stencil and 100% paste coverage is recommended for the eight electrical contact pads. Do not apply paste on the
leveling pads. The HMC1043 has been tested successfully with no-clean solder paste.
Pick and Place
Placement is machine dependant and no restrictions are recommended.
Reflow and Rework
No special profile is required for the HMC1043. The product is compatible with lead eutectic and lead-free solder paste
reflow profiles. Honeywell recommends the adherence to solder paste manufacturer’s guidelines. The HMC1043 may be
reworked with soldering irons, but extreme care must be taken not to overheat the copper pads from the part’s fiberglass
substrate. Irons with a tip temperature no greater than 315°C should be used. Excessive rework risks the copper pads
pulling away into the molten solder.
BASIC DEVICE OPERATION
The Honeywell HMC1043 magnetoresistive sensors are Wheatstone bridges to measure magnetic fields. With power
supply applied to the bridges, the sensors convert any incident magnetic field in the sensitive axis directions to a
differential voltage outputs. In addition to the bridge circuits, each sensor has two on-chip magnetically coupled straps; the
offset strap and the set/reset strap. These straps are Honeywell patented features for incident field adjustment and
magnetic domain alignment; and eliminate the need for external coils positioned around the sensors.
The magnetoresistive sensors are made of a nickel-iron (Permalloy) thin-film deposited on a silicon wafer and patterned
as a resistive strip element. In the presence of a magnetic field, a change in the bridge resistive elements causes a
corresponding change in voltage across the bridge outputs.
These resistive elements are aligned together to have a common sensitive axis (indicated by arrows on the pinouts) that
will provide positive voltage change with magnetic fields increasing in the sensitive direction. Because the output only is in
proportion to the one-dimensional axis (the principle of anisotropy) and its magnitude, additional sensor bridges placed at
orthogonal directions permit accurate measurement of arbitrary field direction. The combination of sensor bridges in two
and three orthogonal axis permit applications such as compassing and magnetometry.
The offset strap allows for several modes of operation when a direct current is driven through it. These modes are: 1)
Subtraction (bucking) of an unwanted external magnetic field, 2) null-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.
Offset Straps
The offset strap is a spiral of metallization that couples in the sensor element’s sensitive axis. The offset strap measures
nominally 8 ohms, and requires 10mA for each gauss of induced field. The straps will easily handle currents to buck or
boost fields through the ±6 gauss linear measurement range, but designers should note the extreme thermal heating on
the die when doing so.
With most applications, the offset strap is not utilized and can be ignored. Designers can leave one or both strap
connections (Off- and Off+) open circuited, or ground one connection node. Do not tie both strap connections together to
avoid shorted turn magnetic circuits.
Set/Reset Straps
The set/reset strap is another spiral of metallization that couples to the sensor elements easy axis (perpendicular to the
sensitive axis on the sensor die. Each set/reset strap has a nominal resistance of 5 ohms with a nominal required peak
current of 500mA for reset or set pulses. With rare exception, the set/reset strap must be used to periodically condition the
magnetic domains of the magneto-resistive elements for best and reliable performance.
www.honeywell.com
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