MLX90255 MELEXIS [Melexis Microelectronic Systems], MLX90255 Datasheet

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MLX90255

Manufacturer Part Number
MLX90255
Description
Linear Optical Array
Manufacturer
MELEXIS [Melexis Microelectronic Systems]
Datasheet

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Application Note: MLX90255 Demo Board
The demo board described in this document facilitates the evaluation of the MLX90255xx Linear Optical
Arrays. The board provides the necessary timing and clock signals to support both the on-board imaging
device or an externally connected sensor. The designer is then free to investigate the properties and
performance of the device without having to design and construct an external support circuitry. A
regulated DC power supply between 6 and 10V is the only input signal. An oscilloscope is required for
observation and analysis of the output signals.
Features and Benefits
Applications
Functional Diagram
MLX90255 Linear Optical Array
128 x 1 Sensor-Element Organization (1 Not Connected, 1 dummy, 128 real, 1 dummy, 1
Dark Pixel)
385 DPI sensor pitch
High Linearity and Uniformity for 256 Gray-Scale
High Sensitivity: 1.7V @ 10µW/cm 2 @ 0.7ms integration time
Special Gain Compensation for use with single LED light source
Output Referenced to Ground
Single 5V Supply
Operation to 1MHz
position Sensing
electrical Power Assist Steering (EPAS)
spectrometer Applications
Page 1 of 5
General Description
The MLX90255xx linear sensor array consists of
a 128 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 200µm (H) by 66 µm (W) and there is 8
µm
simplified by internal control logic that requires
only a Serial Input (SI) pulse and a clock signal.
The
arranged in a linear array. Light energy falling on
a photodiode generates photocurrent, which is
integrated by the active integration circuitry
associated with that 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. The output
and reset of the integrators is controlled by a
132-bit shift register and reset logic. An output
cycle is initiated by clocking in a logic 1 on SI.
This causes all 132 sampling capacitors to be
disconnected from their respective integrators
and starts an integrator-reset period.
spacing
sensor
between
consists
Linear Optical Array
MLX90255
of
pixels.
Rev 1.0 31-May-01
128
Operation
photodiodes
is

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MLX90255 Summary of contents

Page 1

... Application Note: MLX90255 Demo Board The demo board described in this document facilitates the evaluation of the MLX90255xx Linear Optical Arrays. The board provides the necessary timing and clock signals to support both the on-board imaging device or an externally connected sensor. The designer is then free to investigate the properties and performance of the device without having to design and construct an external support circuitry ...

Page 2

... Supply 1 TP5 GND 1 are out of the device specification 1 on-board MLX90255 sensor (B) and a 5- pins connector for an external device (A) test terminals for all important signals The different blocks can easily be found in the schematic diagram. The main purpose of the demonstration board is to provide a specified clock frequency and an ...

Page 3

... LED indicates selecting one of them. For each SI pulse, 133 CLK pulses are MLX90255 Linear Optical Array generated with the selected frequency, and after them the CLK line is pulled low until the next SI pulse. See further in this document for the correct timings ...

Page 4

... For the MLX90255 the responsivity will peak at about 770nm. Bill of Materials for the demo an MLX90255 demo board with on-board sensor device optionally an external device connected to the 5 pins header a regulated power supply (6…10VDC) an oscilloscope Operation To operate the demo board the following steps are necessary: apply 6… ...

Page 5

... Note In a real-life application two different timing solutions are possible, depending on the overall system specification and performance. MLX90255 Linear Optical Array MLX90255 Linear Optical Array 1. Continuous read-out. generated in a regular and controlled time frame ...

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