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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： | 13/62页 |
| 文件大小： | 1746K |
| 代理商： | DDP3315CQA |
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ADVANCE INFORMATION
20
Micronas
2.3.7. EHT Compensation
The vertical deflection waveform can be scaled
according the average beam current. This is used to
compensate the effects of electric high tension
changes due to beam current variations. EHT compen-
sation for East/West deflection is done with an offset
corresponding to the average beam current. The time
constant of this process is free programmable with a
resolution of 18 bit. Both corrections can be enabled
separately. The maximum scaling coefficient for verti-
cal deflection is 1±x and the maximum offset for east/
west is y, where x, y are adjustable from 0 to 0.25. The
horizontal phase at the output HOUT can be influ-
enced according to the average beam current in a
range of ±1.5
s.
2.3.8. Protection Circuitry
Picture tube and drive stage protection is provided
through the following measurements:
– Vertical protection input: this pin watches the verti-
cal sawtooth signal. In every field the sawtooth must
descend below the lower threshold A and ascend
above the upper threshold B. In this case the pro-
tection flag is set (sawtooth o.k.). If an error occurs
the protection flag is cleared.
After a programmable number of fields with cleared
flag the RGB drive signals are blanked. The blank-
ing is cancelled if the flag is set a programmable
number of lines (see Fig. 2–18)
– Drive shutoff during flyback: this feature can be
selected by software (EFLB)
– Safety input pin: this pin has two thresholds. The
lower threshold A watches for a positive edge in
every line, and the upper threshold B must not be
overshoot, otherwise the RGB signals are blanked
and a soft stop can be performed (HPROT_SS).
Both thresholds have a small hysteresis.
2.3.9. Display Frequency Doubling
The DDP 3315C handles single or double vertical and
horizontal input frequencies. The display frequency
doubling is used when single H/V frequencies are
applied and an external FIFO for scan rate conversion
is used. In this mode it is mandatory to supply an
active video signal to the HS pin, which is not vertical
blanked.
Three different raster modes are selectable via I2C
bus:
A A‘ B‘ B (normal operation)
A A B B (improved vertical resolution)
A A B‘ B‘ (non interlaced)
A/B means field A/B in original raster position and A‘/B‘
means field A/B in the opposite raster position.
A minimum field length filter can be switched on (DFD-
FILT) to write only the smallest field length of the past
up to four fields into the memory. This prevents read
before write errors in signals with a strong changing
field length (e.g. VCR signals).
Fig. 2–18: Vertical protection timing
vert. protection flag
accu
blanking
1
-1
~10 fields
~40 fields
t
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