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VDP3130Y 参数 Datasheet PDF下载

VDP3130Y图片预览
型号: VDP3130Y
PDF下载: 下载PDF文件 查看货源
内容描述: 视频处理器家族 [Video Processor Family]
分类和应用:
文件页数/大小: 76 页 / 1707 K
品牌: MICRONAS [ MICRONAS ]
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VDP 313xY  
ADVANCE INFORMATION  
2.12.5.EHT Compensation  
2.13.Reset and Power On  
The vertical 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 compensation for East/West  
deflection is done with an offset corresponding to the  
average beam current.  
Reset of most VDP 313xY functions is performed by  
the RESQ pin. When this pin becomes active all inter-  
nal registers and counters are lost. When the RESQ  
pin is released, the internal reset is still active for 4 µs.  
After that time, the initialization of all required registers  
is performed by the internal Fast Processor.  
The VDP 313xY has clock and voltage supervision cir-  
cuits to generate a stable HOUT signal. The voltage  
supervision activates an internal reset signal when the  
supply for the digital circuits (VSUPD) goes below  
~2.5 V for more than 50 ns. This reset signal is  
extended by 50 µs after VSUPD is back again.  
2.12.6.Protection Circuitry  
Picture tube and drive stage protection is provided  
through the following measures:  
Vertical flyback protection input: this pin searches  
for a negative edge in every field, otherwise the  
RGB drive signals are blanked.  
After power on or reset the HOUT generation is  
switched to a freerunning mode with a fix duty cycle of  
50 %. For normal operation the EHPLL bit has to be  
set first. During the switch the actual period of HOUT  
can vary by up to 1 µs.  
Drive shutoff during flyback: this feature can be  
selected by software.  
Safety input pin: this input has two thresholds.  
Between zero and the lower threshold, normal func-  
tioning takes place. Between the lower and the  
higher threshold, the RGB signals are blanked.  
Above the higher threshold, the RGB signals are  
blanked and the horizontal drive is shut off. Both  
thresholds have a small hysteresis.  
Reset  
The main oscillator and the horizontal drive circuitry  
are run from a separate (standby) power supply and  
are already active while the TV set is powering up.  
4µs  
approx. 60µs  
Internal  
Reset  
Initialization  
Fig. 226: External Reset  
28  
Micronas