參數(shù)資料
型號(hào)： STV9212
廠商： 意法半導(dǎo)體
英文描述： Video Processor for CRT Monitors with PictureBooST
中文描述： 視頻處理器PictureBooST的CRT顯示器
文件頁(yè)數(shù)： 9/34頁(yè)
文件大?。?/td> 335K
代理商： STV9212
9/34
STV9212
Functional Description
The screen can also be blanked by permanently keeping the On-Screen Display FBLK input signal
at high level. In this case, only the video contents of the three video channels are replaced by “black
level” OSD content insertion (signals on pins OSD1 through OSD3 permanently at low level). Refer
to
Section 2.5: OSD Insertion on page 11
.
2.3
Contrast Control Stage and Automatic Beam Limiter
The contrast stages are simultaneously controlled on all three RGB channels with high attenuation
matching precision. Refer to electrical specifications for values. See
Figure 7: Contrast Control
and
Table 4: I2C-Bus Register Map
.
The Automatic Beam Limiter (ABL) is an attenuator controlled through the ABL input, independent
of contrast stage attenuation. The operating range is about 2 V (from 3 V to 1 V). A typical
characteristic is shown in
Figure 8
. Refer to
Section 4: Electrical Specifications
for specific values.
When not used, the ABL pin is to be connected to VCCA.
Figure 7: Contrast Control
Figure 8: ABL Characteristics
Before contrast stage
After contrast stage
V
Ref
V
Ref
Note: CRST I2C-bus field acts equally on all 3 video channels
Video Black Level
Video Black Level
CRST
=max
CRST
=mid
CRST
=min
5
0
-2
-4
-6
-8
-10
-12
-14
-16
Attenuation (dB)
0
V
ABL
(V)
4
3
2
1
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