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参数资料
| 型号： | DDP3315CQA |
| 厂商： | MICRONAS SEMICONDUCTOR HOLDING AG |
| 元件分类： | 消费家电 |
| 英文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP80 |
| 封装： | PLASTIC, QFP-80 |
| 文件页数： | 7/62页 |
| 文件大小： | 1746K |
| 代理商： | DDP3315CQA |
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ADVANCE INFORMATION
Micronas
15
Thus a cutoff control cycle for RGB requires one field
only, while a complete white drive control cycle
requires three fields. During cutoff and whitedrive mea-
surement, the average beam current limiter function
(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. 2–13). The start line for the tube measurement
(cutoff red) can be programmed via I2C-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. If the measurement lines are
enabled (CUT(WDR)_DIS = 0) the user can read
the measured cutoff & white drive values in the
CUTOFF(WDRIVE)_R/G/B registers. An external
software can now control the settings of the
CUT(WDR)_R/G/B registers.
– 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). The calculated error is
used with a small hysteresis (1.5%) to adjust cutoff
and drive. The higher the loopgain
(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 it’s 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). If one drive value exceeds
the maximum allowed threshold (MAX_WDR) the
amplitude of the white drive measurement line will be
increased and decreased if one of them goes below
the fixed threshold 475.
Fig. 2–12: MADC range switch
Fig. 2–13: MADC measurement timing
beam current 1
beam current 2
A
D
MADC
SENSE
RSW1
R2
RSW2
R3
R1
ROUT
GOUT
BOUT
active
resistors
measurement
Lines
VBSO
TML
VBST
BCL
WDR
CUTOFF
Internal calibration
BCL
R1||R2||R3
R1
R1||R2||R3
R1
R1||R3
black
ultra black
cutoff
B
cutoff
G
cutoff
R
white
drive
R
CUT_R + IBRM + WDRMWDR
CUT_R + IBRM
CUT_G + IBRM
CUT_B + IBRM
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