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.
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 BENEFITS
Low Height Magnetic Sensors (1.40mm)
Narrow Dimensions and Small Size for Low Profile Vertical Sensing
Applications and Mounting, No Layout Constraints
Surface Mount Three-Axis Sensors
Easy to Assemble & Compatible with High Speed SMT Assembly
Low Voltage Operations (2.0V)
Compatible for Battery Powered Applications
Low Cost
Designed for High Volume, Cost Effective OEM Designs
Available in Tape & Reel Packaging
High Volume OEM Assembly
4-Element Wheatstone Bridges
Low Noise Passive Element Design
Wide Magnetic Field Range (+/-6 Oe)
Sensor Can Be Used in Strong Magnetic Field Environments
Patented Offset and Set/Reset Straps
Stray Magnetic Field Compensation
Lead Free Package Construction
RoHS Compliance
HMC1043
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SPECIFICATIONS
Characteristics
Conditions*
Min
Typ
Max
Bridge Elements
Supply
Vbridge referenced to GND
1.8
3.0
10
Resistance
Bridge current = 10mA
per bridge
measured Vb to Vss
800
265
1000
333
1500
500
Operating Temperature
Ambient
-40
125
Storage Temperature
Ambient, unbiased
-55
150
Humidity
Tested at 85°C
85
MSL
Moisture Sensitivity Level
3
Field Range
Full scale (FS) – total applied field
-6
+6
Linearity Error
Best fit straight line
± 1 gauss
± 3 gauss
± 6 gauss
0.1
0.4
1.4
Hysteresis Error
3 sweeps across ±3 gauss
0.06
Repeatability Error
3 sweeps across ±3 gauss
0.1
Bridge Offset
Offset = (OUT+) – (OUT-)
Field = 0 gauss after Set pulse
-1.25
±0.5
+1.25
Sensitivity
Set/Reset Current = 0.5A per strap
0.8
1.0
1.2
Noise Density
@ 1kHz, Vbridge=5V
50
Resolution
50Hz Bandwidth, Vbridge=5V
120
Bandwidth
Magnetic signal (lower limit = DC)
5
Disturbing Field
Sensitivity starts to degrade.
Use S/R pulse to restore sensitivity.
20
Sensitivity Tempco
TA= -40 to 125°C, Vbridge=5V
TA= -40 to 125°C, Ibridge=5mA
-3700
-3400
-1000
-3100
Bridge Offset Tempco
TA= -40 to 125°C, No Set/Reset, ±1 gauss
TA= -40 to 125°C, With Set/Reset
±700
±10
Bridge Ohmic Tempco
Vbridge=5V, TA= -40 to 125°C
2100
2400
2700
Cross-Axis Effect
Cross field = 1 gauss, Happlied = ±1 gauss
±0.3
Max. Exposed Field
No perming effect on zero reading
10000
X,Y, Z sensor
Orthogonality
X toY sensors
X to Z or Y to Z
0.01
1.5
Set/Reset Straps
Resistance
Measured from S/R+ to S/R-
1.5
2.5
3
Current
0.1% duty cycle, or less, 2 sec current pulse
2
3
8
Resistance Tempco
TA= -40 to 125°C
3300
3700
4100
Offset Straps
Resistance
Measured from OFF+ to OFF-
10
13
16
Offset Constant
DC Current
Field applied in sensitive direction
10
Resistance Tempco
TA= -40 to 125°C
3500
3900
4300
* Tested at 25°C except stated otherwise.
HMC1043
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SCHEMATIC DIAGRAM
PIN CONFIGURATIONS
(Arrow indicates direction of applied field that generates a positive output voltage after a SET pulse.)
Pin Number
Function
Pin Number
Function
1
OUT- Y
9
NC
2
VSS
10
OUT- Z
3
OUT+ X
11
OUT+ Z
4
OFF- XY
12
VB
5
SR+
13
OFF- Z
6
OUT+ Y
14
OFF+ Z
7
SR-
15
OUT-X
8
NC
16
OFF+ XY
VB (12)
VSS
(2)
OUT- X
(15) OUT+ X
(3) OUT- Y
(1) OUT+ Y
(6) OUT- Z
(10) OUT+ Z
(11)
OFF- XY
(4)
OFF- Z
(13)
SR-
(7) SR+
(5)
OFF+ XY
(16)
OFF+ Z
(14)
VB (12)
VSS
(2)
OUT- X
(15) OUT+ X
(3) OUT- Y
(1) OUT+ Y
(6) OUT- Z
(10) OUT+ Z
(11)
OFF- XY
(4)
OFF- Z
(13)
SR-
(7) SR+
(5)
OFF+ XY
(16)
OFF+ Z
(14)
9 NC
10 OUT- Z
11 OUT+ Z
12 VB
13 OFF- Z
14 OFF+ Z
15 OUT- X
16 OFF+ XY
1 OUT- Y
2 VSS
3 OUT+ X
4 OFF- XY
5 SR+
6 OUT+ Y
7 SR-
8 NC
HMC1043
BOTTOM SIDE
X
Y
Z
9 NC
10 OUT- Z
11 OUT+ Z
12 VB
13 OFF- Z
14 OFF+ Z
15 OUT- X
16 OFF+ XY
1 OUT- Y
2 VSS
3 OUT+ X
4 OFF- XY
5 SR+
6 OUT+ Y
7 SR-
8 NC
HMC1043
BOTTOM SIDE
X
Y
Z
9 NC
10 OUT- Z
11 OUT+ Z
12 VB
13 OFF- Z
14 OFF+ Z
15 OUT- X
16 OFF+ XY
1 OUT- Y
2 VSS
3 OUT+ X
4 OFF- XY
5 SR+
6 OUT+ Y
7 SR-
8 NC
HMC1043
BOTTOM SIDE
X
Y
Z
HMC1043
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PACKAGE OUTLINE
PACKAGE DRAWING HMC1043 (16-PIN LPCC, dimensions in millimeters)
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.
NOMINAL PAD SIZE 0.40 X 0.23 MM
NOMINAL LAND SIZE 0.65 X 0.28MM
0.20
0.05
NOMINAL PAD SIZE 0.40 X 0.23 MM
NOMINAL LAND SIZE 0.65 X 0.28MM
0.20
0.05
3.00
3.00
1.50
0.25
0.50
0.40
0.23 (16)
HMC1043 BOTTOM VIEW
3.00
3.00
1.50
0.25
0.50
0.40
0.23 (16)
HMC1043 BOTTOM VIEW
HMC1043
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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. The HMC1043 weight is 25.6 milli-grams.
Reflow and Rework
This device is classified as MSL 3 with 260 C peak reflow temperature. A baking process (125 C, 24 hrs) is required if
device is not kept continuously in a dry (< 10% RH) environment before assembly. No special reflow profile is required for
HMC1043 which is compatible with lead eutectic and lead-free solder paste reflow profiles. Honeywell recommends the
adherence to solder paste manufacturer’s guidelines.
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.
A set pulse is defined as a positive pulse current entering the S/R+ strap connection. The successful result would be the
magnetic domains aligned in a forward easy-axis direction so that the sensor bridge’s polarity is a positive slope with
positive fields on the sensitive axis result in positive voltages across the bridge output connections.
HMC1043
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A reset pulse is defined as a negative pulse current entering the S/R+ strap connection. The successful result would be
the magnetic domains aligned in a reverse easy-axis direction so that sensor bridge’s polarity is a negative slope with
positive fields on the sensitive axis result in negative voltages across the bridge output connections.
Typically a reset pulse is sent first, followed by a set pulse a few milliseconds later. By shoving the magnetic domains in
completely opposite directions, any prior magnetic disturbances will be completely erased by the duet of pulses. For
simpler circuits with less critical requirements for noise and accuracy, a single polarity pulse circuit may be employed (all
sets or all resets). With these uni-polar pulses, several pulses together become close in performance to a set/reset pulse
circuit. Figure 1 shows an H-Bridge Set/Reset circuit that will generate both set and reset pulses to the set/reset strap.
Additional information and examples on set/reset pulse circuits can be found in our application notes AN201 and AN213.
ORDERING INFORMATION
Ordering Number
Product
HMC1043
HMC1043-TR
HMC1043-demo
Cut Tape
Tape and Reel with 1k units/reel
Demonstration Board
FIND OUT MORE
For more information on Honeywell’s Magnetic Sensors visit us online at www.magneticsensors.com or contact us at
800-323-8295 (763-954-2474 internationally).
The application circuits herein constitute typical usage and interface of Honeywell product. Honeywell does not warranty or assume liability of customer-
designed circuits derived from this description or depiction.
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.
U.S. Patents 4,441,072, 4,533,872, 4,569,742, 4,681,812, 4,847,584 6,529,114 and 7,095,226 apply to the technology described
Figure 1: Example H-Bridge Set/Reset Pulse Circuit From AN213
Honeywell
12001 Highway 55
Plymouth, MN 55441
Tel: 800-323-8295
www.honeywell.com/magneticsensors
Form #900341 Rev F
November 2010
©2010 Honeywell International Inc.