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PYTHON480 データシート(PDF) 34 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

PYTHON480 データシート(HTML) 34 Page - ON Semiconductor

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PYTHON 480
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34
AEC Control Range
The control range for each of the exposure parameters can
be pre−programmed in the sensor. Table 24 lists the relevant
registers.
Table 24. MINIMUM AND MAXIMUM EXPOSURE
CONTROL PARAMETERS
Register
Name
Description
168[15:0] min_exposure
Lower bound for the integration
time applied by the AEC
169[1:0]
min_mux_gain
Lower bound for the first stage
analog amplifier.
This stage has two
configurations with the following
approximative gains:
0x1 = 1x
0x4 = 2x
169[3:2]
min_afe_gain
Lower bound for the second
stage analog amplifier.
This stage has two
configurations with the following
approximative gain settings:
0x7 = 1x
0x1 = 1.75x
169[15:4] min_digital_gain Lower bound for the digital gain
stage. This configuration
specifies the effective gain in 5.7
unsigned format
170[15:0] max_exposure
Upper bound for the integration
time applied by the AEC
171[1:0]
max_mux_gain
Upper bound for the first stage
analog amplifier.
This stage has two
configurations with the following
approximative gains:
0x1 = 1x
0x4 = 2x
171[3:2]
max_afe_gain
Upper bound for the second
stage analog amplifier
This stage has two
configurations with the following
approximative gain settings:
0x7 = 1x
0x1 = 1.75x
171[15:4] max_digit-
al_gain
Upper bound for the digital gain
stage. This configuration
specifies the effective gain in 5.7
unsigned format
AEC Update Frequency
As an integration time update has a latency of one frame,
the exposure control parameters are evaluated and updated
every other frame.
Note: The gain update latency must be postpone to match
the integration time latency. This is done by asserting the
gain_lat_comp register on address 204[13].
Exposure Control Status Registers
Configured integration and gain parameters are reported
to the user by means of status registers. The sensor provides
two levels of reporting: the status registers reported in the
AEC address space are updated once the parameters are
recalculated and requested to the internal sequencer. The
status registers residing in the sequencer’s address space on
the other hand are updated once these parameters are taking
effect on the image readout. Refer to Table 25 reflecting the
AEC and Sequencer Status registers.
Table 25. EXPOSURE CONTROL STATUS REGISTERS
Register
Name
Description
AEC Status Registers
184[15:0] total_pixels
Total number of pixels taken into
account for the AEC statistics.
186[9:0]
average
Calculated average illumination
level for the current frame.
187[15:0] exposure
AEC calculated exposure.
Note: this parameter is updated at
the frame end.
188[1:0]
mux_gain
AEC calculated analog gain
(1st stage)
Note: this parameter is updated at
the frame end.
188[3:2]
afe_gain
AEC calculated analog gain
(2st stage)
Note: this parameter is updated at
the frame end.
188[15:4] digital_gain
AEC calculated digital gain
(5.7 unsigned format)
Note: this parameter is updated at
the frame end.


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