hmc1051 Honeywell International's Solid State Electronics Center (SSEC), hmc1051 Datasheet - Page 6

• Manufacturer Part Number: hmc1051
• Description: 1, 2 And 3 Axis Magnetic Sensors
• Manufacturer: Honeywell International's Solid State Electronics Center (SSEC)

HMC1051/HMC1052/HMC1053
PACKAGE DRAWING HMC1053 (16-PIN LCC)
STENCIL DESIGN AND SOLDER PASTE
A 4 mil stencil and 100% paste coverage is recommended for the electrical contact pads.
REFLOW AND REWORK
The HMC1051ZL and HMC1053 parts should reference application note AN-216. The other part types have no special
profile required and compatible with lead eutectic and lead-free solder paste reflow profiles up to 220°C. Honeywell
recommends the adherence to solder paste manufacturer’s guidelines. The HMC105X parts 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.
DEVICE OPERATION
The Honeywell HMC105X family of magnetoresistive sensors are Wheatstone bridge devices to measure magnetic fields.
With power supply applied to a bridge, the sensor converts any incident magnetic field in the sensitive axis direction to a
differential voltage output. In addition to the bridge circuit, the 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.
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