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参数资料
| 型号： | TDA9116 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 偏转 |
| 英文描述： | HORIZ/VERT DEFLECTION IC, PDIP32 |
| 封装： | SHRINK, PLASTIC, DIP-32 |
| 文件页数： | 20/47页 |
| 文件大小： | 725K |
| 代理商： | TDA9116 |
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TDA9116
27/47
Figure 2. Horizontal sync signal
10.2.2 - Sync. presence detection flags
The sync. signal presence detection flags in the
status register (VDet, HVDet, VExtrDet) do not
show in real time the presence or absence of the
corresponding sync. signal. They are latched to 1
as soon as a single sync. pulse is detected. In or-
der to reset them to 0 (all at once), a 1 must be
written into SDetReset I2C bus bit, the reset action
taking effect with ACK bit of the I2C bus transfer to
the register containing the SDetReset bit. The de-
tection circuits are then ready to capture another
event (pulse). See Note 47.
Figure 3. Extraction of V-sync signal from H/V-sync signal
10.2.3 - MCU controlled sync. selection mode
I2C bus bit VSyncAuto is set to 0. The MCU reads
the polarity and signal presence detection flags,
after setting the SDetReset bit to 1 and an appro-
priate delay, to obtain a true information of the sig-
nals applied, reads and evaluates this information
and controls the vertical signal selector according-
ly. The MCU has no access to polarity inverters,
they are controlled automatically.
See also chapter I2C BUS CONTROL REGISTER
MAP on page 22.
10.2.4 - Automatic sync. selection mode
I2C bus bit VSyncAuto is set to 1. In this mode, the
device itself controls the I2C bus bits switching the
polarity inverters (HVPol, VPol) and the vertical
sync. signal selector (VSyncSel), using the infor-
mation provided by detection circuitry. If both ex-
tracted and pure vertical sync. signals are present,
the one already selected is maintained. No inter-
vention of the MCU is necessary.
10.3 - HORIZONTAL SECTION
10.3.1 - General
The horizontal section consists of two PLLs with
various adjustments and corrections, working on
horizontal deflection frequency, then phase shift-
ing and output driving circuitry providing H-drive
signal on HOut pin. Input signal to the horizontal
section is output of the polarity inverter on H/
HVSyn input. The device ensures automatically
that this polarity be always positive.
10.3.2 - PLL1
The PLL1 block diagram is in Figure 5. It consists
of a voltage-controlled oscillator (VCO), a shaper
with adjustable threshold, a charge pump with inhi-
bition circuit, a frequency and phase comparator
and timing circuitry. The goal of the PLL1 is to
make the VCO ramp signal match in frequency the
sync. signal and to lock this ramp in phase to the
sync. signal, with a possibility to adjust a perma-
nent phase offset. On the screen, this offset re-
sults in the change of horizontal position of the pic-
ture. The loop, by tuning the VCO accordingly,
gets and maintains in coincidence the rising edge
of input sync. signal with signal REF1, which is de-
rived from the VCO ramp by a comparator with
threshold adjustable through
HPOS I2C bus con-
trol. The coincidence is identified and flagged by
lock detection circuit on pin HLckVBk as well as by
HLock I2C bus flag.
Positive
Negative
TH
tPulseHSyn
H/V-sync
Integration
Extracted
textrV
TH
tPulseHsyn
V-sync
Internal
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