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參數(shù)資料
| 型號(hào)： | EVB90255 |
| 英文描述： | EVB90255 EValuation Board for the MLX90255 |
| 中文描述： | EVB90255評(píng)估板MLX90255 |
| 文件頁(yè)數(shù)： | 5/5頁(yè) |
| 文件大?。?/td> | 125K |
| 代理商： | EVB90255 |
MLX90255
Linear Optical Array
MLX90255 Linear Optical Array
Page 5 of 5
Rev 1.0 31-May-01
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.
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