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PDF HMC1043 Data sheet ( Hoja de datos )
| Número de pieza | HMC1043 | |
| Descripción | 3-Axis Magnetic Sensor | |
| Fabricantes | Honeywell | |
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3-Axis Magnetic Sensor
HMC1043
Advanced Information
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
4 Low Height Magnetic Sensors (1.40mm)
4 Surface Mount Three-Axis Sensors
4 Low Voltage Operations (2.0V)
4 Low Cost
4 Available in Tape & Reel Packaging
4 Lead Free Package Construction
4 4-Element Wheatstone Bridges
4 Wide Magnetic Field Range (+/-6 Oe)
4 Patented Offset and Set/Reset Straps
4
Narrow Dimensions and Small Size for Low Profile Vertical
Applications and Mounting, No Layout Constraints
Sensing
4 Easy to Assemble & Compatible with High Speed SMT Assembly
4 Compatible for Battery Powered Applications
4 Designed for High Volume, Cost Effective OEM Designs
4 High Volume OEM Assembly
4 Complies with Current Environmental Standards
4 Low Noise Passive Element Design
4 Sensor Can Be Used in Strong Magnetic Field Environments
4 Stray Magnetic Field Compensation
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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 HMC1053L 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
5
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