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AR0331 Scheda tecnica(PDF) 44 Page - ON Semiconductor

Il numero della parte AR0331
Spiegazioni elettronici  Full HD Digital Image Sensor
PDF  72 Pages
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Produttore elettronici  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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AR0331 Scheda tecnica(HTML) 44 Page - ON Semiconductor

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AR0331_DS Rev. L Pub. 5/15 EN
43
©Semiconductor Components Industries, LLC, 2015.
AR0331: 1/3-Inch 3.1 Mp/Full HD Digital Image Sensor
Changing Sensor Modes
Figure 34:
Example of Changing the Sensor from Context A to Context B
Combi Mode
To facilitate faster switching between linear and HDR modes, the AR0331 includes a
Combi Mode feature. When enabled, Combi Mode loads a single (HDR) sequencer.
When switching from HDR to linear modes, the sequencer remains the same, but only
the T1 image is output. While not optimized for linear mode operation, it allows faster
mode switching as a new sequencer load is not needed. Combi Mode is enabled by
setting bit R0x30BA[8]. See the AR0331 Developer Guide for more information on Combi
Mode.
Compression
When the AR0331 is configured for linear mode operation, the sensor can optionally
compress 12-bit data to 10-bit using A-law compression. The compression is applied
after the data pedestal has been added to the data. See “Pedestals” on page 25.
The A-law compression is disabled by default and can be enabled by setting R0x31D0
from “0” to “1”.
Table 17:
A-Law Compression Table for 12-10 bits
Input Range
Input Values
Compressed Codeword
11
10
9
8
7
6
5
4
3
2
1
0
9
8
7
6
5
4
3
2
1
0
0 to 127
0
0
0
0
0
a
b
c
d
e
f
g
0
0
0
a
b
c
d
e
f
g
128 to 255
0
0
0
0
1
a
b
c
d
e
f
g
0
0
1
a
b
c
d
e
f
g
256 to 511
0
0
0
1
a
b
c
d
e
f
g
X
0
1
0
a
b
c
d
e
f
g
512 to 1023
0
0
1
a
b
c
d
e
f
g
X
X
0
1
1
a
b
c
d
e
f
g
1024 to 2047
0
1
a
b
c
d
e
f
g
h
X
X
1
0
a
b
c
d
e
f
g
h
2048 to 4095
1
a
b
c
d
e
f
g
h
X
X
X
1
1
a
b
c
d
e
f
g
h
Active Rows
Vertical Blanking
Tim e
1/60s
1 /6 0s
Start of Vertic al Blanking
Start of Fram e
S ta rt o f A c tiv e R o w
End of Fram e
Serial SYNC Codes
End of Fram e
Readout
End of Fram e
Readout
End of Fram e
Readout
1/30s
1928x1088
Fra m e N+ 1
1928x1 088
F ram e N
H B (136 P ixels /C olum n )
H B (136 P ixels /C olum n )
2048x1 536
F ram e N + 2
HB (76 P ixels/Column)
)
W rite co n text A to B
during read out of Fram e N
In tegration tim e of co ntext
B m o de im plem en ted
during read out of fram e
N+ 1
C ontext B m o de is
im p lem en ted in fram e N + 2



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