Magnetics Business & Technology - November/December 2021 - 20

PRODUCT NEWS
Allegro Expands Magnetic Sensing Portfolio
Having a speed-only protocol and industry-leading air gap that's
50% larger than existing options, it improves design-in flexibility,
expands design margin and tolerance capability, and facilitates a
wider range of sensor installation locations, says Allegro.
Allegro Microsystems has been aggressively expanding its
magnetic sensing portfolio, targeting new application needs in
automotive and industrial sensing. Among its recent developments
are a new magnetic position sensor for advanced driver
assistance systems (ADAS) and autonomous driving, a giant
magnetoresistance (GMR) gear tooth speed sensor for measuring
the rotation of ferromagnetic gears, and a coreless Hall-effect
current sensor for automotive and industrial systems.
The new A31315 magnetic position sensor, depicted above,
enables next-generation ADAS applications for safety-critical automotive
performance. It is the newest member of the company's
3DMAG family of rotary and linear magnetic position sensor ICs
for automotive and industrial applications. The sensors combine
planar and vertical Hall-effect technologies to measure magnetic
field components along three axes (X, Y, Z), enabling true 3D
sensing capabilities with a wide magnetic dynamic range without
saturation.
The flexible 3D Hall front end and configurable signal processing
architecture enable highly accurate, absolute linear position and
rotary position measurements up to 360° while easing system
integration challenges by providing greater freedom in sensor
placement.
" Building on Allegro's decades of automotive magnetic sensing
innovation, the 3DMAG family expands our range of industryleading
position sensing solutions to include virtually any moving
magnet system while offering the performance and functional
safety capabilities required to enable the next generation of
ADAS solutions, " said Scott Milne, business unit director for
magnetic position sensors.
Unlike traditional side-by-side dual die configurations, its stacked
die construction closely aligns the sensing elements of both die,
ensuring the measurement of nearly identical magnetic fields.
The innovative design enables the sensor to offer superior
channel matching performance and tighter channel comparison
thresholds common in fully redundant safety systems.
The new GMR gear tooth speed sensor gives transmission
designers more options than ever before, says Allegro. The
ATS19480 speed sensor IC provides a single-channel solution
that's ideal for hybrid and pure electric vehicle transmissions,
with use cases extending to two-wheelers, off-road vehicles, and
industrial application designs requiring speed-only information.
" As our newest singlechip
GMR solution for
gear tooth sensing,
the ATS19480 optimizes
performance for
emerging electric vehicle
applications. It's
unique to the market
because of the high air
gap and level of accuracy, "
says Peter Wells, business unit director at Allegro. " It allows
designers to do things that haven't been possible until now.
It can be placed virtually anywhere; transmissions can be smaller
and lighter than ever before, which is especially important in
applications where designers want the speed-only protocol. It's a
real game changer. " It complements the company's fully-integrated
Hall-effect speed sensors, as well as its family of front-biased
Hall-effect and GMR products for magnetic target sensing.
Earlier this year, Allegro expanded its coreless current sensor
portfolio for EV and industrial applications with development of
the new ACS37610 which joins a previous model to make the
industry's first family of truly coreless Hall sensing solutions to
measure 100 A to >4000 A without a core or U-shaped magnetic
shield, says the company.
" As a leading innovator in current sensing solutions for more
than 20 years, Allegro was first to market with coreless differential
Hall-effect current sensing technology, and our new
ACS37610 IC enables our customers to accurately measure
hundreds or thousands of amps in a very economical and simple
way, " said Shaun Milano, director of current sensors. " Our differential
Hall-based sensors provide excellent immunity to stray
magnetic fields without the need of a shield, required by competing
solutions, that slows down response and adds non-linearity
error into the system. "
http://www.allegromicro.com http://www.MagneticsMag.com
Magnetics Business & Technology - November/December 2021

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