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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. The HMC1043 weight is 25.6 milli-grams.
Reflow and Rework
This device is classified as MSL 3 with 240 C peak reflow temperature. As specified by JEDEC, parts with an MSL 3
rating require baking prior to soldering if the part is not kept in a continuously dry (< 10% RH) environment before
assembly. Refer to Table 4- 1 “Reference Conditions for Drying Mounted or Unmounted SMD Packages” in the
IPC/JEDEC standard J-STD- 033 “Handling, Packing, Shipping and Use of Moisture/Reflow Sensitive Surface Mount
Devices” for additional information. No special reflow profile is required for HMC1043, which is compatible with lead
eutectic and lead- free solder paste reflow profiles. Honeywell recommends adherence to solder paste manufacturer’s
guidelines. Hand soldering is not recommended.
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.
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