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PYTHON480 データシート(PDF) 31 Page - ON Semiconductor

部品番号 PYTHON480
部品情報  Megapixel Global Shutter CMOS Image Sensor
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メーカー  ONSEMI [ON Semiconductor]
ホームページ  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

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PYTHON 480
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31
Black Reference
The sensor reads out one or more black lines at the start of
every new frame. The number of black lines to be generated
is programmable and is minimal equal to 1. The length of the
black lines depends on the operation mode. The sensor
always reads out the entire line (404 kernels), independent
of window configurations.
The black references are used to perform black calibration
and offset compensation in the data channels. The raw black
pixel data is transmitted over the usual output interface,
while the regular image data is compensated (can be
bypassed).
On the output interface, black lines can be seen as a
separate window, however without Frame Start and Ends
(only Line Start/End). The Sync code following the Line
Start and Line End indications (“window ID”) contains the
active window number, which is 0. Black reference data is
classified by a BL code.
Reference Lines
The sensor optionally reads out one or more reference
lines after the black lines. The number of reference lines to
be generated is programmable. No reference lines shall be
generated when set to 0. As for the black lines, the length of
the reference lines depends on the operation mode.
The reference lines are not used internally in the sensor.
The ROT for these lines can be configured such that these
lines contain particular reference data, such as a grey level,
in order to perform PRNU correction off−chip. Reference
lines are indicated on the output interface by means of a
dedicated Sync pattern (REF).
The black calibration block can be configured to either
perform black level correction and compression or not. In
the latter case, the LSB is discarded from the ADC word.
Optionally, the black level calibration processor can be
configured to transmit the average black level on the
reference lines. In this mode, the reference pixel data are
replaced by the average black level, as calculated by the
black calibration block. Channel differences can easily be
observed
in
this
mode
(See
register
reg_db_ref_bcal_enable).
Signal Path Gain
Analog Gain Stages
Referring to Table 20, three gain settings are available in
the analog data path to apply gain to the analog signal before
it is digitized. The gain amplifier can apply a gain of
approximately 1x to 3.5x to the analog signal.
The moment a gain reconfiguration is applied and
becomes valid can be controlled by the gain_lat_comp
configuration.
With ‘gain_lat_comp’ set to ‘0’, the new gain
configurations are applied from the very next frame.
With ‘gain_lat_comp’ set to ‘1’, the new gain settings are
postponed by one extra frame. This feature is useful when
exposure time and gain are reconfigured together, as an
exposure time update always has one frame latency.
Table 20. SIGNAL PATH GAIN STAGES
Address
Gain Setting
Gain Stage 1 (204[4:0])
Gain Stage 2 (204[12:5])
Overall Gain
204[12:0]
0x00E1
1
1
1
204[12:0]
0x00E4
2
1
2
204[12:0]
0x0024
2
1.75
3.5
NOTE: The sensor performance specifications are tested at unity gain. Analog gain above 2x affects noise performance. All other gains
settings shown in this table are tested for sensor functionality only.
Digital Gain Stage
The digital gain stage allows fine gain adjustments on the
digitized samples. The gain configuration is an absolute 5.7
unsigned number (5 digits before and 7 digits after the
decimal point).


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