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參數(shù)資料
| 型號： | TDA9109 |
| 廠商： | 意法半導體 |
| 英文描述： | LOW-COST DEFLECTION PROCESSOR FOR MULTISYNC MONITORS |
| 中文描述： | 低費用偏轉(zhuǎn)處理器多同步監(jiān)測儀 |
| 文件頁數(shù)： | 16/30頁 |
| 文件大?。?/td> | 266K |
| 代理商： | TDA9109 |
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OPERATINGDESCRIPTION
I - GENERALCONSIDERATIONS
I.1 - Power Supply
The typical values of the power supply voltages
V
CC
and V
DD
are 12V and 5V respectively. Opti-
mum operation is obtained for V
CC
between 10.8
and 13.2V and V
DD
between4.5 and 5.5V.
Inordertoavoiderraticoperationofthecircuitduring
thetransientphaseof V
CC
andV
DD
switchingon,or
off,the valueof V
CC
andV
DD
aremonitored: ifV
CC
islessthan7.5Vtyp.orifV
DD
islessthan4.0Vtyp.,
theoutputsof the circuit are inhibited.
Similarly,beforeV
DD
reaches4V,alltheI
2
Cregister
arereset to theirdefault value.
In order to have very good power supply rejection,
the circuit is internally supplied by several voltage
references (typ. value : 8V). Two of these voltage
references are externally accessible, one for the
verticalandone forthehorizontalpart.Theycanbe
used to bias external circuitry (if I
LOAD
is less than
5mA).Itis necessaryto filterthe voltagereferences
byexternalcapacitorsconnectedtoground,inorder
to minimize the noise and consequentlythe ”jitter”
onvertical and horizontaloutputsignals.
I.2 - I
2
C Control
TDA9109/SNbelongs to the I
2
C controlled device
family. Instead of being controlled by DC voltages
on dedicatedcontrolpins, each adjustmentcanbe
done via the I
2
C Interface.
The I
2
C bus is a serial bus with a clockand a data
input.Thegeneralfunctionandthebusprotocolare
specified in the Philips-bus data sheets.
Theinterface(DataandClock)isa comparatorwith
hysteresis;thethresholds(less then2.2V onrising
edge, more than 0.8V on falling edge with 5V
supply)are TTL-compatible. Spikes of up to 50ns
arefilteredby anintegratorandthemaximumclock
speedis limited to 400kHz.
The data line (SDA) can be used bidirectionally.
In read-mode the IC sends reply information
(1 byte) to themicro-processor.
The bus protocol prescribes a full-byte transmis-
sion in all cases. The first byte after the start
condition is used to transmit the IC-address
(hexa 8C for write, 8D for read).
I.3 - Write Mode
In write mode the second byte sent contains the
subaddress of the selected function to adjust (or
controlstoaffect)andthethirdbytethecorrespond-
ing databyte. It is possibleto sendmore than one
data byte to the IC.If afterthe thirdbyte no stop or
start condition is detected, the circuit increments
automaticallyby onethemomentarysubaddressin
the subaddress counter (auto-increment mode).
So it ispossible totransmitimmediatelythe follow-
ing data bytes without sending the IC address or
subaddress.This canbeusefulto reinitializeallthe
controls very quickly (flash manner). This proce-
dure can be finished by a stop condition.
Thecircuithas14adjustmentcapabilities: 1forthe
horizontal part, 4 for the vertical, 2 for the E/W
correction,2 forthedynamichorizontalphasecon-
trol,1 for the Moiré option, 3 for the horizontal and
the vertical dynamic focus and 1 for the B+ refer-
ence adjustment.
17 bits are also dedicated to several controls
(ON/OFF, Horizontal Forced Frequency,Sync Pri-
ority, DetectionRefresh and XRAYreset).
I.4 - Read Mode
During the read mode the second byte transmits
the reply information.
The reply byte contains the horizontal and vertical
lock/unlockstatus,the XRAYactivationstatusand,
the horizontalandverticalpolaritydetection.It also
containsthesyncdetectionstatuswhichisusedby
the MCU toassign the sync priority.
Astopconditionalwaysstopsalltheactivitiesofthe
bus decoderand switchesto high impedanceboth
the data and clock line (SDAand SCL).
See I
2
C subaddressand control tables.
I.5 - Sync Processor
The internal sync processor allows the
TDA9109/SNto accept:
- separated horizontal & vertical TTL-compatible
sync signal,
- composite horizontal & vertical TTL-compatible
sync signal.
TDA9109/SN
16/30
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TDA9109A | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW-COST I2C CONTROLLED DEFLECTION PROCESSOR FOR MULTISYNC MONITOR |
| TDA9109N | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW-COST DEFLECTION PROCESSOR FOR MULTISYNC MONITORS |
| TDA9109S | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW-COST DEFLECTION PROCESSOR FOR MULTISYNC MONITORS |
| TDA9109SN | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:LOW-COST DEFLECTION PROCESSOR FOR MULTISYNC MONITORS |
| TDA9110 | 制造商:STMicroelectronics 功能描述:TDA9110 - Bulk |
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