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MT9P001 Folha de dados(PDF) 22 Page - ON Semiconductor

Nome de Peças MT9P001
Descrição Electrónicos  1/2.5-Inch 5 Mp CMOS Digital Image Sensor
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Fabricante Electrônico  ONSEMI [ON Semiconductor]
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offset of between –2048 and 2047 is added. The resulting
12-bit pixel value is then output on the DOUT[11:0] ports.
The analog offset applied is determined automatically by
the black level calibration algorithm, which attempts to shift
the output of the analog signal chain so that black is at a
particular level. The digital offset is a fine-tuning of the
analog offset.
Figure 25. Signal path
Pixel
Voltage
Digital
Gain
Analog
Gain
Digital Datapath
X
+
Analog Signal Chain
X
+
Digital
Offset
Correction
Black
Level
Calibration
DOUT[11:0]
ADC
Analog
Offset
Gain
There are two types of gain supported: analog gain and
digital gain. Combined, gains of between 1 and 128 are
possible. The recommended gain settings are shown in
Table 15.
Table 15. GAIN INCREMENT SETTINGS
Gain Range
Increments
Digital Gain
Analog Multipier
Analog Gain
1– 4
0.125
0
0
8–32
4.25–8
0.25
0
1
17–32
9–128
1
1–120
1
32
1. Analog gain should be maximized before applying digital gain.
The combined gain for a color C is given by:
GC = AGC x DGC.
Analog Gain
The analog gain is specified independently for each color
channel. There are two components, the gain and the
multiplier. The gain is specified by Green1_Analog_Gain,
Red_Analog_Gain, Blue_Analog_Gain, and
Green2_Analog_Gain in steps of 0.125. The analog
multiplier is specified by Green1_Analog_Multiplier,
Red_Analog_Multiplier, Blue_Analog_Multiplier, and
Green2_Analog_Multiplier. These combine to form the
analog gain for a given color C as shown in this equation:
AGC = (1 + C_Analog_Multiplier) × (C_Analog_Gain /
8)
The gain component can range from 0 to 7.875 in steps of
0.125, and the multiplier component can be either 0 or 1
(resulting in a multiplier of 1 or 2). However, it is best to keep
the “gain” component between 1 and 4 for the best noise
performance, and use the multiplier for gains between 4 and
8.
Digital Gain
The digital gain is specified independently for each color
channel in steps of 0.125. It is controlled by the register
fields Green1_Digital_Gain, Red_Digital_Gain,
Blue_Digital_Gain, and Green2_Digital_Gain. The digital
gain for a color C is given by:
DGC = 1 + (C_Digital_Gain / 8)
Offset
The MT9P001 sensor can apply an offset or shift to the
image data in a number of ways.
An analog offset can be applied on a color-wise basis to
the pixel voltage as it enters the ADC. This makes it possible
to adjust for offset introduced in the pixel sampling and gain
stages to be removed, centering the resulting voltage swing
in the ADC’s range. This offset can be automatically
determined by the sensor using the automatic black level
calibration (BLC) circuit, or it can be set manually by the
user. It is a fairly coarse adjustment, with adjustment step
sizes of 4 to 8 LSBs.
Digital offset is also added on a color-wise and line-wise
basis to fine tune the black level of the output image. This
offset is based on an average black level taken from each
row’s dark columns, and is automatically determined by the


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