SGS Thomson Microelectronics STV9420, STV9421 Datasheet
MULTISYNCON-SCREENDISPLAY FOR MONITOR
.
CMOSSINGLECHIP OSDFOR MONITOR
.
BUILT IN 1 KBYTE RAM HOLDING:
- PAGES’DESCRIPTORS
- CHARACTER CODES
- USERDEFINABLECHARACTERS
.
128 ALPHANUMERIC CHARACTERS OR
GRAPHIC SYMBOLS IN INTERNAL ROM
(12 x 18 DOTMATRIX)
.
UP TO 26 USERDEFINABLECHARACTERS
.
INTERNALHORIZONTAL PLL(15 TO120kHz)
.
PROGRAMMABLE VERTICAL HEIGHT OF
CHARACTER WITH A SLICEINTERPOLATOR
TO MEET MULTI-SYNCH REQUIREMENTS
.
PROGRAMMABLE VERTICAL AND HORIZONTALPOSITIONING
.
FLEXIBLESCREENDESCRIPTION
.
CHARACTER BY CHARACTER COLOR SELECTION(UP TO 8 DIFFERENT COLORS)
.
PROGRAMMABLE BACKGROUND (COLOR,
TRANSPARENTOR WITH SHADOWING)
.
CHARACTER BLINKING
.
2-WIRES ASYNCHRONOUS SERIAL MCU
INTERFACE (I
.
4 x 8 BITS PWM DAC OUTPUTS ON THE
STV9421
.
SINGLEPOSITIVE5V SUPPLY
2
C PROTOCOL)
STV9420
STV9421
DIP16
(Plastic Package)
ORDER CODE : STV9420
DESCRIPTION
The STV9420/21is an ON SCREEN DISPLAYfor
monitor.It is built as a slaveperipheralconnected
to a host MCU via a serial I
display memory, controls all the display attributes
and generatespixels from the data read in its on
chip memory. The line PLL and a special slice
interpolator allow to have a display aspect which
doesnotdependonthelineandframefrequencies.
2
C interface allows MCU to make transparent in-
I
ternal accessto preparethe next pagesduring the
display of the current page. Toggle from one page
to anotherby programmingonly one register.
4 x 8 bits PWM DAC are available (STV9421) to
provide DC voltage control to other peripherals.
The STV9420/21providesthe user aneasy to use
and cost effective solutionto displayalphanumeric
or graphicinformation on monitor screen.
October 1995
2
C bus. It includes a
DIP20
(Plastic Package)
ORDER CODE : STV9421
1/16
STV9420 - STV9421
PINCONNECTIONS
DIP16
FBLK
H-SYNC
V-SYNC
V
DD
PXCK
CKOUT
XTALOUT
XTALIN
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
TEST
B
G
R
GND
RESET
SDA
9
SCL
PWM1
FBLK
H-SYNC
V-SYNC
PXCK
CKOUT
XTALOUT
XTALIN
PWM4
PIN DESCRIPTION
Symbol
PWM1 1 O DAC1 Output
FBLK 1 2 O Fast Blanking Output
H-SYNC 2 3 I Horizontal Sync Input
V-SYNC 3 4 I Vertical Sync Input
V
DD
PXCK 5 6 O PixelFrequency Output
CKOUT 6 7 O Clock Output
XTALOUT 7 8 O Crystal Output
XTALIN 8 9 I Crystal or Clock Input
PWM4 10 O DAC4 Output
PWM2 11 O DAC2 Output
SCL 9 12 I SerialClock
SDA 10 13 I/O SerialInput/output Data
RESET 11 14 I Reset Input
GND 12 15 S Ground
R 13 16 O Red Output
G 14 17 O Green Output
B 15 18 O Blue Output
TEST 16 19 I Reserved (grounded in Normal Operation)
PWM3 20 O DAC3 Output
Pin Number
DIP16 DIP20
I/O Description
4 5 S +5V Supply
DIP20
1
2
3
4
V
DD
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
PWM3
TEST
B
G
R
GND
RESET
SDA
SCL
PWM2
9420-01.AI /9421-01.AI
9420-01.TBL
2/16
BLOCK DIAGRAMS
STV9420
XTALINXTAL
OUT
78
PXCK TES TV
DD
45
STV9420 - STV9421
16
STV9421
CKOUT
HSYNC
CKOUT
HSYNC
VSYNC
RESET
6
2
3
11
STV9420
XTALINXTAL
7
3
PXCK TEST
OUT
89
HORIZONTAL
DIGITAL PLL
Address/Data
HORIZONTAL
DIGITAL PLL
Addre ss/Data
DISPLAY
CONTROLLER
1
G B FBLK GND SCL
R
V
DD
56
4KROM
(128 characters)
4KROM
(128 characters)
1213 14 15
19
1K RAM
Page Descriptors +
User Defined Char.
1KRAM
Page Descriptors +
User Defined Char.
2
I C BUS
INTERFACE
910
SDA
10
20
9420-02.EPS
PWM4
PWM3
VSYNC
RESET
14
4
DISPLAY
CONTROLLER
2
1516 17 18
R G B FBLK GND SCL SDA
2
I C BUS
INTERFACE
12 13
PWM
STV9421
11
1
PWM2
PWM1
9421-02.EPS
3/16
STV9420 - STV9421
ABSOLUTEMAXIMUM RATINGS
Symbol Parameter Value Unit
V
DD
V
IN
T
oper
T
stg
ELECTRICAL CHARACTERISTICS
=5V,VSS=0V,TA=0 to 70°C, F
(V
DD
Symbol Parameter Min. Typ. Max. Unit
SUPPLY
V
DD
I
DD
INPUTS
SCL, SDA, TEST, RESET, V-SYNC and H-SYNC
V
IL
V
IH
I
IL
OUTPUTS
R, G, B, FBLK, SDA, CKOUT, PXCK and PWMi(i = 1 to 4)
V
OL
V
OH
For R, G, B and FBLK outputs, see Figure 1.
Supply Voltage -0.3, +7.0 V
Input Voltage -0.3, +7.0 V
Operating Ambient Temperature 0, +70 °C
Storage Temperature -40, +125 °C
= 8 to15MHz, TEST= 0 V,unless otherwise specified)
XTAL
Supply Voltage 4.75 5 5.25 V
Supply Current - - 50 mA
Input Low Voltage 0.8 V
Input High Voltage 0.8 V
DD
Input Leakage Current -20 +20 µ
Output Low Voltage (IOL= 1.6mA) 0 0.4 V
Output High Voltage (IOL= -0.1mA) 0.8 V
DD
V
DD
9420-02.TBL
V
A
V
9420-03.TBL
Figure 1 : TypicalR, G, B OutputsCharacteristics
(V)
V
,
V
OH
V
OL
I (A)
10
-4
10
-3
10
-2
10
-1
5
2.5
0
V
10
OL OH
-5
9420-17.EPS
4/16
STV9420 - STV9421
TIMINGS
Symbol Parameter Min. Typ. Max. Unit
OSCILATOR INPUT : XTI (see Figure 2)
t
WH
t
WL
f
XTAL
f
PXL
RESET
t
RES
R, G, B, FBLK (C
t
R
t
F
t
SKEW
2
I
C INTERFACE : SDA AND SCL (see Figure 3)
f
SCL
t
BUF
t
HDS
t
SUP
t
LOW
t
HIGH
t
HDAT
t
SUDAT
t
F
t
R
Note 1 : These parameters are not tested on each unit. They are measured during our internal qualification procedure which includes
Clock High Level 35 ns
Clock Low Level 35 ns
Clock Frequency 6 15 MHz
Pixel Frequency 30 MHz
Reset High Level Pulse 4
= 30pF)
LOAD
Rise Time (Note 1) 5 ns
Fall Time (Note 1) 5 ns
Skew between R, G, B, FBLK (Note 1) 5 ns
SCL Clock Frequency 0 1 MHz
Time the bus must be free between 2 access 500 ns
Hold Time for Start Condition 500 ns
Set up Time for Stop Condition 500 ns
The Low Period of Clock 400 ns
The High Period of Clock 400 ns
Hold Time Data 0 ns
Set up Time Data 375 ns
Fall Time of SDA 20 ns
Rise Time of Both SCL and SDA
characterization on batches comming from corners of our processes and also temperature characterization.
Depend on the pull-up resistor
and the load capacitance
µs
9420-04.TBL
Figure2
XTI
Figure 3
STOP START DATA STOP
t
t
WL
SDA
t
WH
SCL
9420-03.EPS
BUF
t
HDS
t
HIGH
t
S UDAT
t
HDAT
t
SUP
t
LOW
9420-04.EPS
5/16
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