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New PCB-free pressure sensor chips from Melexis take automotive engine management accuracy to new heights

Update time : 2023-04-03 11:14:40

Melexis, the global microelectronics engineering company, has launched two new PCB-free pressure sensor chip products. MLX90823 (analogue output) and MLX90825 (digital SENT output) are two relative pressure sensor chips that support gauge mode (corresponding to atmospheric pressure) or differential mode (with two variable pressure levels). Unlike the absolute pressure sensor chips, they measure the pressure difference between the two sides of the sensor chip. These factory calibrated devices are designed for measuring pressure ranges from 0.1 to 1.5 bar.

These two new pressure sensor chips take the automotive industry to a new level of measurement accuracy. The Melexis family of pressure sensor chips supports plug and play functionality for a wide range of internal combustion engine management applications. These include:
● Fuel vapour and crankcase ventilation applications: ensuring that fuel vapour from the fuel tank or gases leaking through the piston are brought back into the combustion chamber to prevent them from being released into the atmosphere.
● EGR, GPF/DPF: reduces NOx emissions by sensing the amount of recirculated exhaust gas at the engine intake while trapping residual particulate matter in the exhaust filter.
● Secondary Air Injection (SAI): This allows rapid preheating of the catalytic converter by "secondary air injection", so that vehicle emissions can be maintained within limits in all application scenarios, including when the engine is started cold.
● (T)MAP: monitors the air entering the engine and precisely regulates the amount of fuel, thus reducing fuel consumption.
Laurent Otte, Senior Product Line Manager at Melexis, said: "With a comprehensive PCB-free product portfolio, OEMs are able to handle a wide range of pressure applications with ease. Customers benefit from a platform solution with high reusability, reduced development costs and shorter time to market."
Both the MLX90823 and MLX90825 integrate sensors, signal processing circuitry, digital hardware, voltage regulators, SENT or analogue output drivers and all basic passive components. the MLX90825 supports pre-calibrated negative temperature coefficient (NTC) thermistor inputs (SENT outputs). Customers do not need to perform terminal calibration when connecting NTCs via the pressure sensor chip. Excellent overvoltage (+40V) and reverse voltage (-40V) protection mechanisms are integrated into the chip. Thanks to the excellent protection range, this technology makes trucking more environmentally friendly. The pressure sensor chips of this series can operate in the temperature range of -40°C to 160°C and can even withstand temperatures of up to 170°C for short periods, thus supporting the trend towards smaller engine structures.
The MEMS sensing element of the MLX90823 and MLX90825 consists of a micromechanical sensing film etched onto a silicon substrate. The sensing membrane responds to pressure changes accordingly. The piezoresistive elements implanted in the sensing film are connected to form a Wheatstone bridge, which generates a signal. A 16-bit digital signal processing (DSP) is responsible for temperature compensation. Finally, the results are provided via the SENT output or the analogue output.

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