STV2145
I
2
C BUS CONTROLLED EAST-WEST
AND VERTICAL INTERFACE
April 1996
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
SENSM
SENSP
FROUT
EWOUT
EWIN
OBLK
HFLY
BREATH
SCL
SDA
VRET
REG
V
CC
LPF
CVERT
GND
RESISTOR BRIDGE
DIFFERENTIAL INPUT
FRAME OUTPUT ERROR SIGNAL
EAST-WEST ERROR AMPLIFIER OUTPUT
EAST-WEST ERROR AMPLIFIER INPUT
OPEN COLLECTOR BLANKING SIGNAL
HORIZONTAL FLYBACK INPUT
(CURRENT INPUT)
VERTICAL SIZE MODULATION
I
2
C BUS SERIAL CLOCK
I
2
C BUS SERIAL DATA
VERTICAL RETRACE PULSE
(FROM STV2118A)
REGULATOR OUTPUT
FOR SERIES TRANSISTOR
REGULATED VOLTAGE SUPPLY
LOOP FILTER FOR 2H-PLL
VERTICAL AGC CAPACITOR
GROUND
2145-01.EPS
PIN CONNECTIONS
DIP16
(Plastic Package)
ORDER CODE : STV2145
.
INTEGRATED VERTICAL SAWTOOTH GEN-
ERATOR
WITH
AMPLITUDE
CONTROL
LOOP (50Hz - 60Hz)
.
INTERLACE MODE INTRINSICALLY CON-
TROLLED BY STV2118A
.
VERTICAL SIZE CORRECTION (BREATH-
ING) TO ADAPT DEFLECTION SENSITIVITY
TO THE CURRENT BEAM (HIGH VOLTAGE
VARIATION)
.
BUS ADJUSTED VERTICAL PARAMETERS :
VERTICAL AMPLITUDE, VERTICAL POSI-
TION AND S-CORRECTION
.
EAST-WEST FUNCTION GENERATOR WITH
INTEGRATED ERROR AMPLIFIER (THUS,
ONLY 1 EXTERNAL POWER DARLINGTON
IS NECESSARY FOR EW-FUNCTION)
.
BUS
CONTROLLED
EAST-WEST
FUNC-
TIONS
:
EW-AMPLITUDE,
HORIZONTAL
WIDTH, EW-TILT AND EW-SHAPE (CORNER
CORRECTION)
.
OVERSIZE
BLANKING
(VERTICAL
AND
HORIZONTAL) WHICH PERMIT ZOOM AND
SUBTITLE FACILITIES FOR 4/3 AND 16/9
CRTs
DESCRIPTION
The STV2145 is an I
2
C bus processor containing
the vertical deflection East-West functions and
oversize blanking. This circuit is foreseen as ADD-
ON for the Video Chroma Processor STV2118A
to permit 110
CRT applications covering standard
4/3 screen format and new 16/9 format with zoom
and subtitle facilities. STV2145 has been designed
to drive a standard TDA8172/8177 vertical booster
and an external transistor for East-West.
1/17
PIN DESCRIPTION
Pin N
Name
Function
Description
1
SCL
Serial Clock for I
2
C Bus
Data input (no pull down - capability)
2
SDA
Serial Data for I
2
C Bus
Data input and output (pull down - capability for acknowledge
and data reply)
3
VRET
Vertical Reset Input
Vertical Synchronization Signal from STV2118A
4
REG
Control Pin for Regulator
Output for controlling the ext. series regulator transistor
5
V
CC
Supply Voltage Scanning
Supply voltage of scanning part, connected with external series
regulator transistor
6
LPF
Loop Filter for PLL
Loop filter for horizontal 2 x F
LINE
VCO
7
CVERT
Vertical AGC Capacitor
Regulation of vertical saw tooth amplitude
8
GND
Ground
Ground
9
BREATH
Breathing Input
Input voltage = 1 to 7.8V = vertical size compensation
10
HFLY
Horizontal Flyback Input
Voltage input for horizontal flyback, polarity positive
11
OBLK
Oversize Blanking Signal
Oversize blanking output :
- open collector output : high ohmic = blanking
- low (transistor saturated) = no blanking
12
EWIN
East-West Input
Input of the error amplifier for the East-West modulator
13
EWOUT
East-West Output
Output of the error amplifier for the East-West modulator
(current output, biasing directly the darlington output transistor)
14
FROUT
Output for Frame Amplifier
Output of transconductance amplifier, pin has to be connected
to the inverting input of the vertical power amplifier
15
SENSP
Sense Input, Positive
Input of internal resistor bridge for sensing the vertical
deflection YOKE current
16
SENSM
Sense Input, Negative
Input of internal resistor bridge for sensing the vertical
deflection YOKE current
2145-01.TBL
STV2145
2/17
12
3
45
6
78
9
10
16
11
12
13
14
15
VOLTAGE
REGULATOR
VERTICAL
RESISTOR
BRIDGE
HORIZONTAL
OVERSIZE-
BVLANKING
SIMPLIFIED
VERTICAL-
COUNTDOW
50-60Hz
VERTICAL
SAWTOOTH-
GENERATOR
VERTICAL
AMPLITUDE
ADJUSTMENT
VERTICAL
S-CORRECTION
AND
V-OVERSIZE
AMPLITUDE
MODULATOR
EW
FUNCTION
I
2
C
BUS
INTERFACE
PLL
FOR
DOUBLE
LINE-FREQUENCY
Vertical
Oversize
AGC
Pulse
AGC
Capacitor
V_DC
STV2145
33nF
C_VERT
GND
SDA
SCL
TO
I
2
C
BUS
V_RETR
HFLY_INR
LPF
22k
VERTICAL
PULSE
(FROM
STV2112/16/18)
220nF
4.7k
4.7nF
O_BLK
V
CC
REG
SENSM
SENSP
TO
CRT
BOARD
HEATER
WINDING
(POS.
FLYBACK)
R4
R3
R1
R2
EW_IN
1k
3.3nF
TO
EW
MODULATOR
680
k
1nF
270k
BCL
BREATH
1000
F
1k
100
k
RSENS
(1
)
10nF
10nF
100
k
13V
10k
26V
220nF
V
CC1
9V
BC547
or
SMD
typ
1.5nF
26V
FR_OUT
13V
VERTICAL
YOKE
3.3k
10k
2145-02.EPS
BLOCK DIAGRAM
STV2145
3/17
I
2
C BUS INFORMATION
Slave Address
hex 8C/8D
MSB
LSB
1
0
0
0
1
1
0
R/W
Address Mapping (write mode)
x = don't care bits, not used for the decoding of the subaddress.
Subaddress
Data Bits
Binary
Hex
MSB
LSB
xxxxx000
x0 or x8
TEST_MODE
VERTICAL
OVERSIZE
BLANKING 2
VERTICAL
OVERSIZE
BLANKING 1
S_CORRECTION
xxxxx001
x1 or x9
V_AMPLITUDE
xxxxx010
x2 or xA
TEST_MODE
SUB_TITLE
V_DC
xxxxx011
x3 or xB
HORIZONTAL
OVERSIZE
BLANKING 2
HORIZONTAL
OVERSIZE
BLANKING 1
EW_AMPLITUDE
xxxxx100
x4 or xC
EW_SHAPE
xxxxx101
x5 or xD
EW_LOW
EW_TILT
xxxxx110
x6 or xE
TEST_MODE
H_WIDTH
Subaddress 0 (hex 00) : Vertical Oversize Blanking & S_CORRECTION
MSB
LSB
TEST _MODE
OV_BLK_VERT2
OV_BLK_VERT1
S3
S2
S1
S0
TEST_MODE
: 0
: Normal operations
1
: Reserved for SGS-THOMSON test
OV_BLK_VERT1,
OV_BLK_VERT2
: Vertical oversize blanking (register SUB_TITLE in subadress X2 or XA)
(see Table 1)
Table 1
TV Mode
Sent
Frequency
(via VRET)
OV_BLK_VERT
2
OV_BLK_VERT
1
SUB_TITLE
Start
of Blanking
(middle of line)
End
of Blanking
(middle of line)
STANDARD 4 :3
50Hz
60Hz
0
0
0
No Blanking
SUBTITLE
50Hz
60Hz
Don't Care
Don't Care
1
302
259
67
59
ZOOM1
50Hz
60Hz
0
1
0
285
239
49
43
ZOOM2
50Hz
60Hz
1
1
0
278
234
59
49
BLANK
50Hz
60Hz
1
0
0
Full Blanking
S1, S2, S3, S4 : S-CORRECTION
0000 (hex 00) : Maximal S-CORRECTION
1111 (hex 0F) : Minimal S-CORRECTION (vertical sawtooth flat)
STV2145
4/17
I
2
C BUS INFORMATION (continued)
Subaddress 1 (hex 01) : Vertical Sawtooth Amplitude
MSB
LSB
V6
V5
V4
V3
V2
V1
V0
V6, V5, V4, V3,
V2, V1, V0
: V_AMPLITUDE
0000000 (hex 00) : Minimal V_AMPLITUDE (0.46V
PP
on SENSP/SENSM)
1111111 (hex 7F) : Maximal V_AMPLITUDE (1.16V
PP
on SENSP/SENSM)
Subaddress 2 (hex 02) : Vertical Shift & Vertical Position
MSB
LSB
TEST_MODE
SUB_TITLE
V4
V3
V2
V1
V0
TEST_MODE
: 0
: Normal operations
1
: Reserved for SGS-THOMSON test
SUB_TITLE
: DC shift of vertical sawtooth
0
: Normal operations
1
: Vertical Sawtooth shifted by 90mV upwards and unsymmetrical vertical
oversize blanking (if nominal amplitude = V_AMPLITUDE = hex40)
V4, V3, V2, V1, V0 : Vertical position (V_DC)
00000 (hex 00) : Minimal position (picture shifted down by -65mV on SENSP/SENSM)
11111 (hex 1F) : Maximal position (picture shifted up by +65mV on SENSP/SENSM)
Subaddress 3 (hex 03) : Horizontal Oversize Blanking & EW-Amplitude
MSB
LSB
OV_BLK_HOR2
OV_BLK_HOR1
E4
E3
E2
E1
E0
OV_BLK_HOR1,
OV_BLK_HOR2
: Horizontal oversize blanking (see Table 2)
Table 2
TV Mode
OV_BLK_HOR2
OV_BLK_HOR1
Reference is Rising Edge
of Positive HFLY-Back (
s)
Start of Blanking
End of Blanking
STANDARD 4 :3
0
Don't Care
0
11.5
ZOOM 1 (14:9)
1
0
-1.7
13.7
ZOOM 2 (16:9)
1
1
-3.2
15.2
E4, E3, E2, E1, E0 : EW-AMPLITUDE
00000 (hex 00) : Maximal parabola amplitude = 0.74V for EW_LOW = 0 ; 0.48V for
EW_LOW = 1
11111 (hex 1F) : Minimal parabola amplitude = 0.26V for EW_LOW = 0 ; 0.0V for
EW_LOW = 1
Subaddress 4 (hex 04) : EW_SHAPE
EW_SHAPE
: 0000 (hex 00) : Maximal parabola flattening (flattened corners of parabola)
1111 (hex 0F) : Minimal parabola flattening (ideal parabola)
STV2145
5/17
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