Presented in a System-in-Package (SiP) format, ams’ AS517x devices include
full data path diagnostics and enhanced self-test capabilities to enable
automotive systems to comply with relevant safety standards.
ams has released its first magnetic
position sensors developed using the automotive industry’s programme for
ISO26262 safety compliance. They are also ams’ first magnetic position sensor
in a System-in-Package (SiP) format, a space savings package, that enables
lower system costs and the placement of the sensor device in environments that
are prohibitive to PCB based packages.
AS5170 and AS5171 sensors were
developed as SEooC (Safety Element out of Context) devices, as defined in the
ISO26262 functional safety standard. Designed to meet demand for automotive
safety features built into critical vehicle systems, the AS517x parts are ams’
first magnetic position sensors to provide full data path diagnostics, enabling
automotive system OEMs to achieve a higher level of ISO26262 system-level
compliance.
The diagnostic system built into the
AS517x series tests the entire device, from the Hall sensor front end, through
the DSP engine which converts raw measurements of magnetic field strength into
sine and cosine vectors, to the back-end interfaces and pins.
Qualified to AEC-Q100
Grade 0, the sensors accurately measure absolute angle of rotation. Their high
12-bit output resolution enables precise measurements, even for reduced angular
excursions down to a minimum arc of 90°. The devices are suitable for a range
of safety-critical automotive applications including chassis height, gear
shifters, electronic power steering, exhaust gas recirculation, and brake pedal
as well as throttle position sensing.
The AS5171 comes in an
SiP format, which integrates the sensor die and capacitors in a single,
encapsulated three-pin package. The SiP offers improved ESD and EMC
performance, as well as enhanced supply protection. The Supply and Output pins
are protected against over-voltages up to +20V. The Supply pin also offers -20V
of protection against reverse polarity. The AS5171A provides an analogue
output, and the AS5171B provides a digital output, which may be programmed
either as a PWM interface or as a SENT-compliant interface. The analogue
AS5170A and digital AS5170B ICs are housed in an 8-pin SOIC package. Pricing is
$2.64 (AS5170) and $2.87 (AS5171) (1,000). Evaluation boards for the AS5170 and
AS5171 are available.
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