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Melexis unveils robust, thermal-resilient pressure sensors

Posted: 30 Dec 2014 ?? ?Print Version ?Bookmark and Share

Keywords:Melexis? pressure sensor? hydraulics? combustion engine? MEMS?

Melexis has introduced a couple of pressure sensors intended to measure oil or hydraulics pressure in environments such as a transmission or an internal combustion engine that demands high thermal resilience and robustness. Offering the required thermal resilience, the devices also boast high sensitivity and strong linearity. Both exceed the automotive AEC-Q-100 requirements, added the company.

The MLX90815 and MLX90816 are implemented as discrete MEMS devices for measuring absolute pressure in demanding operational environments. The MLX90815 is geared for optimal performance when determining pressures from 0 to 30bar absolute, while the MLX90816 covers full scale pressures ranging from 30-50bar absolute. Both have a maximum deviation in their linearity of just 0.2 per cent FS. Typical sensitivity for the MLX90815 is 1.5mV/V/bar; for the MLX90816 it is 0.5mV/V/bar.

MLX90815, MLX90816

The sensor element incorporated into these MEMS devices consists of a piezo-resistive Wheatstone bridge connected to a micro-machined silicon pressure membrane, fabricated using Melexis' proprietary process technology. As pressure is applied to the membrane, a differential voltage change occurs across the outputs of the Wheatstone bridge while a bias voltage is applied to the bridge inputs.

The MLX90815 and MLX90816 pressure sensors can be supported by the company's sensor interface chips (such as the MLX90320) in order to carry out output signal conditioning. These sensors are highly suited to a variety of automotive pressure monitoring applications, as well as industrial process controls, domestic appliances, medical equipment and consumer electronics gadgetry. Operating temperature range for both products is -40°C to 150°C.

These devices can be employed directly in conventional non-corrosive/non-aggressive media or incorporated into oil-filled sensor modules to further increase their robustness.

- Christoph Hammerschmidt
??EE Times Europe

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