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MLX90255

Linear Optical Array

Melexis Microelectronic Systems  

MLX90255

Linear Optical Array

In the first figure, one can see clearly a first SI

pulse, followed by 133 CLK pulses. After the

selected integration time, a next SI pulse is

generated, again accompanied with 133 CLK

pulses. Note that the CLK pulses have stopped.

During the CLK pulses, the pixel values of the

former integration time are clocked out. This

screenshot repeats itself continously for every

new scan.

Note that this figure does not show the

initialisation scan (very first scan), as this is only

necessary after Power Up. These pictures were

taken during continuous operation.

The second screenshot shows a zoom of the

first one. Here the SI pulse together with the first

CLK pulses is clearly visible. The first pixel has a

low value, as this is an unconnected pixel. (The

last one is connected, but covered with metal.)

Note

In a real-life application two different timing

solutions are possible, depending on the overall

system specification and performance.

1. Continuous read-out. SI pulses are

generated in a regular and controlled time

frame. For each SI pulse, the integration

time is controlled and the data at the output

of the sensor is valid. This requires a high-

speed microcontroller, as it has to handle

this high throughput of data. Continuous

read-out can also be used if the algorithm

requires only a very limited amount of

calculation.

2. ‘Burst-like’ read-out. If the application needs

a long time for data manipulation, the

system cannot control the integration time

for each SI pulse. SI pulses aren’t generated

in a regular time frame corresponding to the

necessary integration time. The first SI pulse

after a longer calculation intensive part,

results in useless data as the integration

time was not precisely timed, so the sensor

will be completely saturated. After the

desired integration time, a second SI pulse

is generated, and the valid data is clocked

out.

MLX90255 Linear Optical Array

Page 5 of 5

Rev 1.0 31-May-01

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