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參數(shù)資料
| 型號： | DDP3310B |
| 廠商： | MICRONAS SEMICONDUCTOR HOLDING AG |
| 元件分類： | 消費家電 |
| 英文描述： | Display and Deflection Processor |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQCC68 |
| 封裝： | PLASTIC, LCC-68 |
| 文件頁數(shù)： | 14/60頁 |
| 文件大小： | 1540K |
| 代理商： | DDP3310B |
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DDP 3310B
ADVANCE INFORMATION
14
Micronas
The picture tube measurement returns results on
every field for:
–
cutoff R
–
cutoff G
–
cutoff B
–
white-drive R or G or B (sequentially)
Thus, a cutoff control cycle for RGB requires one field
only while a complete white-drive control cycle
requires three fields. During cutoff and white-drive
measurement the average beam current limiter func-
tion (see Section 2.2.5.) is switched off. The amplitude
of the cutoff and white-drive measurement lines can be
programmed separately with IBRM and WDRM (see
Fig. 2
–
11). The start line for the tube measurement
(cutoff red) can be programmed via I
2
C-bus (TML).
The built-in control loop for cutoff and white-drive can
operate in three different modes selected by
CUT(WDR)_GAIN and CUT(WDR)_DIS.
–
The user control mode is selected by setting
CUT(WDR)_GAIN = 0. In this mode the registers
CUT(WDR)_R/G/B are used as direct control values
for cutoff and drive using the whole 9-bit range. If
the
measurement
(CUT(WDR)_DIS = 0) the user can read the mea-
sured cutoff & white drive values in the CUT-
OFF(WDRIVE)_R/G/B registers. An external soft-
ware can now control the settings of the
CUT(WDR)_R/G/B registers.
lines
are
enabled
–
The automatic mode is selected by setting
CUT(WDR)_GAIN > 0 and CUT(WDR)_DIS = 0. In
this mode, the registers CUT(WDR)_R/G/B are
used as reference for the measured values (CUT-
OFF(WDRIVE)_R/G/B). Due to the 8-bit resolution
of the ADC, only 8 LSB can be used as reference
values. The calculated error is used with a small
hysteresis (1,5 %) to adjust cutoff and drive. The
higher the loop gain (CUT(WDR)_GAIN), the
smaller the time constant for the adjustment.
–
If the automatic mode was once enabled
(CUT(WDR)_GAIN > 0), the control loop can be
stopped by setting CUT(WDR)_DIS = 1. In this
mode, the calculated cutoff and drive values will no
longer be modified and the measurement lines are
suppressed. Changes of the reference values
(CUT(WDR)_R/G/B) have no effect.
If one of the calculated red, green, or blue white-drive
values exceeds its maximal possible value (WDR_R/
G/B>511), the white balance gets misadjusted. An
automatic drive saturation avoidance prevents from
this effect (WDR_SAT = 1) from occurring. If one drive
value exceeds the maximum allowed threshold
(MAX_WDR), the amplitude of the white-drive mea-
surement line will be increased and decreased if one
of them goes below the fixed threshold 475.
Fig. 2
–
11:
MADC measurement timing
Ultra Black
Black
Cutoff
R
White-
Drive
R
CUT_R + IBRM
CUT_R + IBRM + WDRM
×
WDR_R
TML
CUT_G + IBRM
CUT_B + IBRM
CUTOFF
Active
Resistors
R1
||
R2
||
R3
R1
R1
||
R3
Cutoff
G
Cutoff
B
R1||R2
||
R3
VBST
Lines
Measurement
VBSO
WDR
OFFSET
BCL
BCL
R1
ROUT
GOUT
BOUT
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