July 7, 2011

Melexis Integrated MEMs Sensors Handle More Than Just Pressure

YPRES, Belgium, July 7, 2011 /PRNewswire/ --

The MLX90807 and MLX90808 fully integrated, relative and absolute
pressure sensor die are realized with CMOS technology combined with MEMS
bulk micromachining. These monolithic solutions are both fully automotive
qualified. Each consists of a silicon membrane with piezoresistors to
transform the stress induced by pressure into an electrical signal. An
analog signal chain interacting with a digital core, including programmable
memory, allows full calibration on chip in order to achieve an optimized
transfer function over the desired working pressure and temperature range.

The Melexis integrated pressure sensor die cover many pressure ranges
from a span of 100mbar to several bars. Their use is straightforward when
the media to be measured is relatively benign like dry air found in
barometric sensing or engine intake manifolds, brake boosters or even
stronger media like fuel vapor. For harsher media applications like oils,
liquids and engine exhaust gas, the Melexis chips must include special,
secondary protection for the die.

The Melexis integrated pressure sensors are proven top performers in
demanding automotive applications. The sensors meet and exceed typical
automotive industry quality standards. The MLX90807 and MLX90808 demonstrate
outstanding accuracies after calibration in applications requiring a
miniaturized, compact pressure sensor solution. Melexis integrated pressure
sensors are fully programmable through the connector with built in
protection against all typical overvoltage automotive conditions. The
integrated sensors include circuitry meet all automotive diagnostic
requirements including broken membrane detection and short and open circuit

The applications and capabilities of these devices address several
deficiencies found in competitive, integrated pressure sensors. Melexis
Product Marketing Manager, Laurent Otte indicates that "experimental data
from stress testing shows the MLX 90807 and 90808 are capable of having the
MEMs diaphragm cycled many times in excess of the standard test limits
without failures". Such results provide designers with a confidence level to
allow use of the pressure sensors in high reliability applications knowing
the chips can take the pressure. Secure too in the knowledge that in the
unlikely event of failure the chip can communicate via diagnostics to allow
for safe error handling.

        - Absolute and Relative Integrated Pressure sensors
        - Less than 1% error range typical overall
        - Programmable through the connector (3 pins)
        - Trimmable offset and sensitivity
        - On-Chip Signal Conditioning
        - Output proportional to pressure
        - 5V analog ratiometric output
        - Rail-to-rail output