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PDF STV2145 Data sheet ( Hoja de datos )
| Número de pieza | STV2145 | |
| Descripción | I2C BUS CONTROLLED EAST-WEST AND VERTICAL INTERFACE | |
| Fabricantes | ST Microelectronics | |
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STV2145
I2C BUS CONTROLLED EAST-WEST
AND VERTICAL INTERFACE
. 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 I2C 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.
DIP16
(Plastic Package)
ORDER CODE : STV2145
PIN CONNECTIONS
I2C BUS SERIAL CLOCK SCL
I2C BUS SERIAL DATA
VERTICAL RETRACE PULSE
(FROM STV2118A)
REGULATOR OUTPUT
FOR SERIES TRANSISTOR
REGULATED VOLTAGE SUPPLY
LOOP FILTER FOR 2H-PLL
SDA
VRET
REG
VCC
LPF
VERTICAL AGC CAPACITOR CVERT
GROUND GND
1
2
3
4
5
6
7
8
16 SENSM RESISTOR BRIDGE
15 SENSP DIFFERENTIAL INPUT
14 FROUT FRAME OUTPUT ERROR SIGNAL
13 EWOUT EAST-WEST ERROR AMPLIFIER OUTPUT
12 EWIN EAST-WEST ERROR AMPLIFIER INPUT
11 OBLK OPEN COLLECTOR BLANKING SIGNAL
HORIZONTAL FLYBACK INPUT
10 HFLY (CURRENT INPUT)
9 BREATH VERTICAL SIZE MODULATION
April 1996
1/17
1 page  
STV2145
I2C 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 (0.46VPP on SENSP/SENSM)
1111111 (hex 7F) : Maximal V_AMPLITUDE (1.16VPP 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, : Horizontal oversize blanking (see Table 2)
OV_BLK_HOR2
Table 2
TV Mode
STANDARD 4 :3
ZOOM1 (14:9)
ZOOM2 (16:9)
OV_BLK_HOR2
0
1
1
OV_BLK_HOR1
Don’t Care
0
1
Reference is Rising Edge
of Positive HFLY-Back (µs)
Start of Blanking
End of Blanking
0 11.5
-1.7 13.7
-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)
5/17
5 Page 
STV2145
Figure 3
VDC
VFUP
S-Correction
Sawtooth
∆VSAW
VFLOW
S_CORRECTION = 1111
Original Sawtooth
(SCOMIN)
S_CORRECTION = 0000
Max. Corrected
Sawtooth (SCOMAX)
∆VSAW
TFMID
Fix Points
Approximative
Line Number 72
Points of
Max. Deviation
127 167 207 262
Figure 4
Figure 5
VSAWB
VMID
VSAW
Vertical
Sawtooth
Figure 6
EWIN
12
5kΩ
100nF
VCC
1kΩ
EWOUT
13
Error Amplifier
STV2145
Test circuit : all measurement values
are related to this test circuit, measured at Pin EWIN.
All East-West values below are depending
on the following settings :
V_AMPLITUDE = (1111111) and no breathing
(Pin BREATH at VCC).
VBRIDGE
(~13V)
RSENS
SENSM
16
SENSP
15
Vertival YOKE
R0
2 x R0
R0
2 x R0
Transconductance
Amplifier
VREF (2 - 3V)
FROUT
14
CSTAB
Vertical
Power
Amplifier
VMID
VSAW
STV2145
CSTAB = 1 to 10nF to guarantee stability (oscillation)
Figure 7
Parabola Outside
of Fix Points
VSENS = VFUP
VPAR
VSENS = 0
(see Note 5)
VSENS = VFLOW
(Line 167 for 50Hz)
VDC
Amplitude defined for the Fix points VFUP and VFLOW
(definition see : vertical ramp generator).
Note : valid for all following definitions of parabola amplitude :
between EW_AMPLITUDE = mon. and max. there is a
linear progression in the amplitude VPAR.
11/17
11 Page | ||
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| PDF Descargar | [ Datasheet STV2145.PDF ] | |
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