Pressure sensors suited to automotive market
A
Melexis product story
Edited by the Engineeringtalk editorial team
Nov 4, 2004
Melexis has introduced a new family of fully integrated and programmable pressure sensors.
Melexis has introduced a new family of fully integrated and programmable pressure sensors.
The devices are designed and qualified for harsh duties in automotive applications but are also suitable for medical, consumer and industrial applications claimed Melexis.
The family consists of MLX90257, a relative integrated pressure sensor and MLX90269, an absolute integrated pressure sensor.
The sensors help design engineers to optimise customer applications in terms of cost, space and time to market.
Different pressure ranges are available.
The integration of the pressure sensing element and the signal conditioning circuitry on the same die ensures significant cost benefits believes the company.
A well-proven CMOS technology with added MEMS capabilities enables high volume production.
With very few additional components the ICs will achieve the desired analogue output signal, compensated for sensitivity and offset errors due to temperature effects said Melexis.
The fully integrated programmable mixed signal circuitry calibrates the sensor output by nulling the offset voltage and by applying the appropriate signal gain to calibrate the output voltage span between 0V and 5V.
Error calibration is accomplished via various DACs adjusting the analogue signal processing chain.
The digital coefficients, which determine the calibration parameters, are stored in an on-chip permanent memory.
Both gain and offset have coarse and fine gain circuitry, allowing a very accurate calibration over a wide range of input errors.
Pressure ranges between one and 10 bar are already available added the manufacturer.
An operating temperature range of -40C to 150C, adjustable output voltage clamping, detection and fault and diagnosis modes, over-voltage and reverse polarity protection make the chips suitable for automotive applications believes Melexis.
Its 'programmable through the connector' concept for high-volume implementations is said to enable post assembly programming in the production environment.
Melexis believes that possible applications for the product include manifold air pressure, barometric pressure, water pressure, oil pressure, medical diagnostics, pumps industrial applications and robotics.
MLX90257 and MLX90269 naked die samples and calibration software are available from stock.
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