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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 16/34頁 |
| 文件大小： | 335K |
| 代理商： | STV9212 |
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Functional Description
STV9212
16/34
2.9.2
Cut-off and Brightness Control Outputs
Outputs CO1, CO2 and CO3 provide a DC voltage controlled via bits BRIG[7:0], IBLx[7:0]
IBLRG[7:0], BRIGRG[1:0] and MOD[7:0]. The principal of operation is shown in
Figure 14
.
When bit MOD
is in position AC (= 1), the output voltage is a sum of the “brightness” V
briAC
, “cut-off”
V
iblAC
and a fixed V
COmin
providing a bottom limitation. The brightness adjustment is equally
applied to all three CO1, CO2 and CO3 outputs. It varies depending on bits
BRIG[7:0]
and
BRIGRG[1:0]
, with bits
BRIGRG[1:0]
controlling the range of BRIG adjustment. The cut-off
adjustment is separate for each channel, having one I2C-bus field per channel:
IBL1
,
IBL2
and
IBL3
.
The ratio between the brightness and cut-off ranges depends on the brightness range selection.
See
Figure 16
.
When bit
MOD
is in position DC (= 0), the output voltage on CO3 output is a sum of the “brightness”
V
briDC
and a fixed V
COmin
providing a pedestal. Outputs CO1 and CO2 are floating with internal
Figure 15: Output Infra-black Level
Figure 16: CO1, CO2 and CO3 Outputs while MOD = 1
OUT1
22
18
20
OUT2
OUT3
19
black
infra-black
V
ib
(1)
V
ib
(2)
V
ib
(3)
V
ibmin
V
ibmin
V
ibmin
V
ibof
V
ibof
V
ibof
V
ibl
(1)
V
ibl
(2)
V
ibl
(3)
DC: differential cut-off
AC: V
(1,2,3) = 0V
I2C:
IBL1, IBL2, IBL3
DC: common cut-off/brightness
AC: video amp. biasing
I2C:
IBOF
fixed DC
Channel 1
Channel 2
Channel 3
GNDP
CO1
17
15
CO3
16
CO2
19
V
CO
(1)
V
CO
(2)
V
CO
(3)
V
COmin
V
COmin
V
COmin
V
briAC
V
briAC
V
briAC
V
iblAC
(1)
V
iblAC
(2)
V
iblAC
(3)
I2C:
IBL1, IBL2, IBL3
brightness through cathods
I2C:
BRIG
fixed DC
cut-off
Channel 1
Channel 2
Channel 3
GNDP
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