AMS announced its automotive-grade sensor IC for shifter position detection in hybrid, battery-powered and conventional vehicles

By Warren Miller,
contributing writer

Magnetic sensors are implemented in all kinds of mechanical
and electronic mechanisms, including automobiles. When implemented in the
steering system, they can detect if and when a vehicle is in danger of spinning
out of control. AMS recently announced the release of the
AS5200L
, a dual-die magnetic rotary position sensor with an I2C interface that’s well-suited for the development of systems critical
to automotive safety. The device is AEC-Q100 grade 1 qualified. 

The AS52001 is the latest addition to the AMS line of
magnetic position sensors designed for electrified powertrain drive-by-wire
functions employed in both manual and automatic transmission vehicles. The dual
dies each include separate package pins to prevent an electrical fault in the
system from adversely affecting both measurement outputs.

The AS52001 is contained within an MLF-16 package and measures
5 mm x 5 mm, potentially saving valuable space in smaller development
environments like gear shifts, pedals or other contactless potentiometer
applications. Its I2C interface allows it to be easily programmed
by a host microcontroller, eliminating the need for a dedicated programmer. The
AS52001 also operates on low power in both active and standby modes. 

 

The use of dual dies is a plus in systems where redundancy
and reliability are important, such as in automotive applications where these
are important concerns. The robust design of the device eliminates
susceptibility to stray external magnetic fields. This improves reliability and
accuracy of position measurements. A diagnostic feature also improves safety
and reliability by reporting the absence of a magnet. If the magnetic field
strength goes below a minimum it is captured in a status register and can also
be indicated on the output pin.

The AS5200L offers low power consumption in active and
stand-by modes. A smart low-power mode further improves energy efficiency, and
automatically enters the lowest power mode if the angle doesn’t change for at
least a minute. The normal supply current can be reduced from the 6.4-mA range,
when the device is always on, to 1.5 mA with a 100 ms polling time.
Intermediate settings are also possible, allowing the application to select an
optimal polling time and operational current combination.

An evaluation board for the AS5200L is available from the ams
ICdirect online store. For sample requests or for more technical information,
go to www.ams.com/Position-Sensors/
AS5200L