Near InfraRed (NIR) Fuel Quality Sensor - Optical Linear Array

MLX75306

Near InfraRed (NIR) spectroscopy is the driving technology inside the 3rd generation of Optical Linear Array, Melexis’ MLX75306. The sensor enables real-time fuel quality sensing for engine management.


A cost effective and robust NIR fuel quality sensor consists of an LED light, optical filters and the MLX75306. Measurement of fuel type, mixtures and contaminants provides engine control systems an important new input for optimizing efficiency and emissions.


Specifications

The MLX75306 linear sensor array consists of a 142 x 1 array of photodiodes, associated charge amplifier circuitry and a pixel data-hold function that provides simultaneous integration start and stop times for all pixels. The pixels measure 100µm (H) by 47µm (W) with a 50µm pixel-to-pixel pitch. Operation is simplified due to internal control logic that only requires the upload of commands via the SPI interface.


Optical Linear Array

Light energy falling on a photodiode generates photocurrent, which is integrated by the active integration circuitry associated with each pixel. During the integration period, a sampling capacitor connects to the output of the integrator through an analog switch. The amount of charge accumulated at each pixel is directly proportional to the light intensity and the integration time.


During the read-back period, the charge stored on the sampling capacitors is sequentially connected to a charge-coupled output amplifier that generates a voltage. That voltage is converted to a digital value which results in a digital output stream representing the light intensity. The digital output stream has some additional control bytes, integrity checks and also a temperature byte.
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Top Features

  • 142 customer pixels, 100µm height, 50µm pitch. Total array length: 7.1mm

  • Flat pixel response under uniform light

  • SPI control: MOSI/MISO/CS/SCLK

  • Internal ADC with selectable 8 bit and 4 bit high speed readout

  • 2 bit output (1.5 bit content) based on two programmable 4-bit thresholds

  • 1 bit output based on programmable 4-bit threshold

  • Read-out speed up to 12MHz

  • SPI based easy programmable upload & download features: readout direction, selectable region of interest, multiple automotive test modes, integrity checks

  • 16 bit Integration Time in two ranges: 10µs .. 94.4ms range possible

  • Integrated temperature sensor

  • Max. +/- 12% Pixel to Pixel Difference (note that 4 bit gives a 6.25% step)

  • 3.3V operation

  • Package: SO16 narrow body cavity package technology

  • Devices available for both automotive and consumer markets
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Near InfraRed (NIR) Fuel Quality Sensor - Optical Linear Array - MLX75306

Features and benefits

  • 142 customer pixels, 100µm height, 50µm pitch. Total array length: 7.1mm

  • Flat pixel response under uniform light

  • SPI control: MOSI/MISO/CS/SCLK

  • Internal ADC with selectable 8 bit and 4 bit high speed readout

  • 2 bit output (1.5 bit content) based on two programmable 4-bit thresholds

  • 1 bit output based on programmable 4-bit threshold

  • Read-out speed up to 12MHz

  • SPI based easy programmable upload & download features: readout direction, selectable region of interest, multiple automotive test modes, integrity checks

  • 16 bit Integration Time in two ranges: 10µs .. 94.4ms range possible

  • Integrated temperature sensor

  • Max. +/- 12% Pixel to Pixel Difference (note that 4 bit gives a 6.25% step)

  • 3.3V operation

  • Package: SO16 narrow body cavity package technology

  • Devices available for both automotive and consumer markets
Used in these

Industries

  • Automotive - Chassis & Safety

Inspired Engineering

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