Configuration MC132x
Users Manual Rev. 0.22
16
6.3.3 Load factory profile
The eight factory profiles can be read but not changed by the user.
Command:
:f<n>
<n>
= 0 ... 7
6.4 Image
quality
There are three D/A converter to influence image quality: FPN, Gain, and Black up. FPN, Gain and
especially Black might be adjusted if sensor clock changes. All three parameters are stored in non-
volatile memory as part of the selected profile.
6.4.1 FPN
The
F
ixed
P
attern
N
oise setting reduces the fixed pattern noise that is typical to CMOS sensors. This
level might be changed if the sensor clock frequency is changed. For adjustment set the lens out of fo-
cus and to a medium grey level. Lower FPN until a heavy pattern appears. Then raise by a few points.
Command:
:a1<x
1
x
0
>
<x
1
x
0
>
: Range, typ. 55h ... 80h
Response:
none
6.4.2 Gain
This is the threshold for the A/D converters. Its standard value is 66h for app. 1V. One step is app.
10mV. To increase the gain the value of a2 must be lowered.
Command:
:a2<x
1
x
0
>
<x
1
x
0
>
: Range,
typ.
30h
...
80h
6.4.3 Black
Level
Change Black Level if sensor clock changes. Increase this parameter until grey values in no light condi-
tion (closed lens) are close to zero.
Command:
:a5<x
1
x
0
>
<x
1
x
0
>
: Range, typ. 00h ...ffh
Response:
none
6.5 Image size and position
Image size and position within the sensor is defined by four parameters:
Bit(s) Description
r1[9..0] Number
of first line, 0..3FD
h
r3[9..0]
Number of lines, 0..3FF
h
r4[6..0]
Address/10 of the first pixel
r5[6..0]
Address/10 of the last pixel
Table 6.5-1
