High Speed Rotary Position Sensor from ams Ideal for Use in Safety-Critical Automotive Applications
June 09 2015 - 5:57AM
Business Wire
New AS5147P position sensor IC offers magnetic stray field
immunity and supports ISO26262 compliance programmes
ams AG (SIX: AMS), a leading provider of high performance
sensors and analog ICs, today released the AS5147P, an ultra-high
speed magnetic rotary position sensor which offers reliable
performance in automotive applications compatible with the
requirements of the ISO26262 functional safety standard.
Providing accurate absolute and incremental measurement outputs
at speeds up to 28,000 revolutions per minute (rpm), the AS5147P is
ideal for safety-critical applications such as electric power
steering (EPS), brake and accelerator pedals, pumps, double-clutch
transmissions, starter motors, alternators and windscreen wiper
motors.
Its appeal to automotive system designers rests on a combination
of high measurement accuracy at high rotation speeds, high
reliability, low system cost and support for standards
compliance.
The AS5147P draws on patented DAEC™ (Dynamic Angle Error
Correction) technology to deliver accurate position measurements
even at extremely high rotation speeds. The DAEC compensation
scheme reduces the propagation delay inherent in the sensor’s
signal chain to almost zero. As a result, the AS5147P’s angle error
is a negligible 0.02° at 1.7krpm, 0.17° at 14.5krpm and 0.34° at
28krpm. The DAEC function also enables the device to refresh its
measurement output every 1.9µs.
High reliability and low system cost in automotive applications
are assured by the AS5147P’s intrinsic immunity to stray magnetic
fields. Strong stray magnetic fields are present in vehicles,
particularly those with a partially or wholly electric drivetrain,
which contain powerful electric motors and high current-carrying
conductors. These stray magnetic fields are much stronger than that
of the small target magnet with which a magnetic position sensor is
paired.
The unique differential sensing principle of the magnetic
position sensors from ams makes them immune by design to stray
magnetism. This means that automotive system designers can avoid
the need to incorporate bulky and expensive magnetic shielding into
their products, reducing their size, weight and cost when compared
to designs based on competing magnetic position sensor ICs. The
high sensitivity of the AS5147P also enables the use of a small
(6mm diameter), low-cost target magnet.
In addition, the AS5147P supports automotive OEMs’ ISO26262
compliance programmes in various ways:
- the AS5147P was developed in accordance
with the ISO26262 flow, following the SEooC (Safety Element out of
Context) and AoU (Assumption of Use) guidelines specified in the
standard, thus helping manufacturers to achieve the requirements of
any ASIL grade
- ams provides a safety manual and
failure mode effects diagnostic analysis (FMEDA) document for the
AS5147P, guiding customers on the way to achieve their target ASIL
grade in various applications
- evidence – safety case, certifications
and the AECQ-100 qualificaion (PPAP) – is ready to provide the
documentation of the AS5147P’s development process
- the complete SEooC process according to
the ISO26262 and the documentation supporting it are certified by
an independent third party
- the AS5147P provides internal
diagnostic functions supporting ISO26262 processes, including
magnetic field strength threshold detection, and detection of loss
of magnet
The AS5147P provides both absolute and incremental angle
measurements of a continuously rota-ting shaft, with a
zero-position setting. A standard four-wire serial peripheral
interface allows a host microcontroller to read 14-bit absolute
angle position data and to program non-volatile settings without a
dedicated programmer.
Incremental movements are indicated by a set of ABI signals with
a maximum resolution of 4,096 steps/1,024 pulses per revolution.
The resolution of the ABI signal is programmable to 4,096
steps/1,024 pulses per revolution, 2,048 steps/512 pulses per
revolution or 1,024 steps/256 pulses per revolution. Brushless DC
(BLDC) motors may be controlled through a standard UVW commutation
interface with a programmable number of pole pairs from 1 to 7. The
absolute angle position is also provided as a PWM-encoded output
signal.
‘Offering a combination of high accuracy, compact size and low
system cost, magnetic position sensors are widely regarded as the
best solution for rotary position sensing in vehicles. Now with the
AS5147P, ams has made a magnetic position sensor which fits
seamlessly into OEMs’ ISO26262 compliance programmes, and which
also eliminates any concerns over the effect of stray magnetic
fields’, said Heinz Oyrer, senior marketing manager at ams.
The AS5147P is available now in production volumes in a TSSOP-14
package. Unit pricing is $5.31 in 1,000-unit quantities.
A demonstration board for the AS5147P is available from the ams
ICdirect online shop. For sample requests and for more technical
information, please go to
www.ams.com/Magnetic-Position-Sensors/AS5147P.
Download press picture and block diagram at
http://www.ams.com/eng/Press/Press-Releases/
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version on businesswire.com: http://www.businesswire.com/news/home/20150609005793/en/
amsPatricia Moosburger, Media Relationsphone: +43 (0)
3136 500 31235press@ams.comwww.ams.com
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