參數(shù)資料
型號(hào)： STV9118
廠商： 意法半導(dǎo)體
英文描述： LOW-COST I2C CONTROLLED DEFLECTION PROCESSOR FOR MULTISYNC MONITOR
中文描述： 低費(fèi)用的I2C可控?fù)隙榷嗤斤@示器處理器
文件頁(yè)數(shù)： 32/46頁(yè)
文件大?。?/td> 577K
代理商： STV9118
STV9118
32/46
10.5 - EW DRIVE SECTION
The goal of the EW drive section is to provide, on
pin
EWOut
, a waveform which, used by an exter-
nal DC-coupled power stage, serves to compen-
sate for those geometry errors of the picture that
are symmetric versus vertical axis across the mid-
dle of the picture.
The waveform consists of an adjustable DC value,
corresponding to horizontal size, a parabola of 2nd
order for “pin cushion” correction, a linear for “key-
stone” correction and independent half-parabolas
of 4th order for top and bottom corner corrections.
All of them are adjustable via I
2
C bus, see
I
2
C
BUS CONTROL REGISTER MAP
on
page 21
chapter.
Refer to
Figure 12
,
Figure 13
and to chapter
TYP-
ICAL OUTPUT WAVEFORMS
. The correction
waveforms have no effect in the vertical middle of
the screen (if the
VPOS
control is adjusted to its
medium value). As they are summed, the resulting
waveform tends to reach its maximum span at top
and bottom of the picture. The voltage at the
EWOut
is top and bottom limited (see parameter
V
EW
). According to
Figure 13
, especially the bot-
tom limitation seems to be critical for maximum
horizontal size (minimum DC). Actually it is not
critical since the parabola component must always
be applied. As all the components of the resulting
correction waveform are generated from the out-
put vertical deflection drive waveform, they all
track with real vertical amplitude and position (in-
cluding breathing compensation), thus being fixed
vertically on the screen. They are also affected by
C- and S-corrections. The sum of components oth-
er than DC is affected by value in
HSIZE
I
2
C bus
control in reversed sense. Refer to electrical spec-
ifications for value. The DC value, adjusted via
HSIZE
control, is also affected by voltage on
HE-
HTIn
input, thus providing a horizontal breathing
compensation (see electrical specifications for val-
ue). The resulting waveform is conditionally multi-
plied with voltage on
HPLL1F
, which depends on
frequency. Refer to electrical specifications for val-
ue and more precision. This tracking with frequen-
cy provides a rough compensation of variation of
picture geometry with frequency and allows to fix
the adjustment ranges of I
2
C bus controls through-
out the operating range of horizontal frequencies.
It can be switched off by
EWTrHFr
I
2
C bus bit (off
by default).
The EW waveform signal is buffered by an NPN
emitter follower, the emitter of which is routed to
EWOut
output, with an internal resistor to ground.
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