INTEGRATED CIRCUITS
DATA SHEET
PCB8517
Stand-alone OSD for monitor
applications
Objective specification
File under Integrated Circuits, IC02
1997 Mar 03
Philips Semiconductors
Objective specification
Stand-alone OSD for monitor applications
FEATURES
Interface with microcontroller
•
3-wire high speed (maximum 2.5 Mbits/s) serial
interface with three types of transmission sequence.
On-Screen Display (OSD)
•
On-chip PLL oscillator to generate the OSD dot clock
frequency which is 384
×
horizontal sync frequency
•
Horizontal sync frequency range of 10 to 100 kHz
•
10 rows of 24 characters display buffer
•
128 character fonts
•
12
×
16 character matrix
•
Programmable height of displayed character (from
16 to 63 scan-lines); frame basis
•
4 types of character size; single/double character
height/width; row basis
•
Horizontal starting position: 32 different positions
(6 dots for each step)
•
Vertical starting position: 64 different positions
(4 scan-lines for each step)
•
8 foreground character colours: selection of only 2 out of
the 8 (outside the window) and 4 out of the of 8 (in the
window) in the same row
•
3 character shadowing modes:
– No shadow
– Shadowing
– Bordering shadow
•
3 fully programmable background windows with
overlapping capability and presetting priorities (for
multi-level application). The window colour can be
selected from 1 out of 8
•
Half tone in background window supported
•
Single 5 V power supply
•
Available in DIP16 package.
ORDERING INFORMATION
TYPE
NUMBER
PCB8517P
PACKAGE
NAME
DIP16
DESCRIPTION
plastic dual in-line package; 16 leads (300 mil)
GENERAL DESCRIPTION
PCB8517
The PCB8517 is a stand-alone OSD which is used to
display the adjustment/status information on the screen of
an auto-sync monitor for menu driving application.
The display operation of the device is controlled by a
microcontroller which programs the internal 273 bytes of
RAM via a 3-wire high-speed serial interface. The on-chip
PLL oscillator and programmable character height are
used to keep the same character size displayed on the
screen in different display modes, VGA, SVGA and XGA
for example.
The OSD of the PCB8517 provides display buffers of
10 rows with 24 characters each. These display buffers
can select from 128 customized character fonts (with
12
×
16 bit resolution) to be displayed. The characters
displayed on the screen can be specified double height,
double width, different colour and with/without shadowing.
Three positional background windows are provided for
multi-level application.
VERSION
SOT38-4
1997 Mar 03
2
Philips Semiconductors
Objective specification
Stand-alone OSD for monitor applications
BLOCK DIAGRAM
PCB8517
handbook, full pagewidth
VDDA
4
VSSA
1
VCLK
VDDD
9
VSSD
16
VCO
BIAS
HFLB
2
3
5
+
−
PLL
OSCILLATOR
15
14
COLOUR
ENCODER
4
13
12
RED
GREEN
BLUE
FB
VFLB
10
DISPLAY CONTROL
12-STAGE SHIFT REGISTER
OSDEN
DISPLAY BUFFER
24
×
10 RAM
6
7
8
HIGH SPEED SERIAL
I/O INTERFACE
3
CHARACTER FONTS
128 FONT ROM
WINDOW AND
FRAME CONTROL
11
HTONE
EN
SDI
SCK
CONTROL
REGISTERS
MGD762
Fig.1 Block diagram.
1997 Mar 03
3
Philips Semiconductors
Objective specification
Stand-alone OSD for monitor applications
PINNING
SYMBOL
V
SSA
VCO
BIAS
V
DDA
HFLB
EN
SDI
SCK
V
DDD
VFLB
HTONE
PIN
1
2
3
4
5
6
7
8
9
10
11
analog ground
DESCRIPTION
PCB8517
DC control voltage input/output to regulate the internal PLL oscillator frequency; a low-pass filter
circuit is connected to this pin
bias input/output to regulate the bias current of internal current control oscillator to resonate at a
specific dot frequency
analog power supply
horizontal sync input signal from flyback circuit with negative polarity
active LOW input to enable serial interface
data input of serial interface
clock input of serial interface
digital power supply
vertical sync input signal from flyback circuit with negative polarity
half tone control which outputs a logic 1 during windowing except characters are displayed; it is
used to lower the external RED, GREEN and BLUE amplifier gain to achieve a transparent
windowing effect
fast blanking output of OSD; active HIGH and high impedance when OSD is disabled
blue colour output of OSD; active HIGH and high impedance when OSD is disabled
green colour output of OSD; active HIGH and high impedance when OSD is disabled
red colour output of OSD; active HIGH and high impedance when OSD is disabled
digital ground
FB
BLUE
GREEN
RED
V
SSD
12
13
14
15
16
handbook, halfpage
VSSA 1
VCO 2
BIAS 3
VDDA 4
HFLB 5
EN 6
SDI 7
SCK 8
MGD760
16 VSSD
15 RED
14 GREEN
13 BLUE
PCB8517
12 FB
11 HTONE
10 VFLB
9 VDDD
Fig.2 Pin configuration.
1997 Mar 03
4
Philips Semiconductors
Objective specification
Stand-alone OSD for monitor applications
FUNCTIONAL DESCRIPTION
3-wire high speed serial interface (HSSI)
The 3-wire (EN, SDI and SCK) high speed serial interface
of the PCB8517 is write only and is used to write data from
the microcontroller to the internal 273 bytes of RAM (see
Section “Internal RAM organization (see Fig.4)”) to control
the OSD. The RAM is organized into 11 rows of
32 columns (see Fig.4) and can be programmed by three
types of sequence (see Section “Data sequence and
format”).
D
ATA PROTOCOL
Figure 3 shows the protocol of HSSI. To initiate HSSI
transmission, pin EN must be LOW to enable the
PCB8517 to accept data. The EN input must be pulled
LOW prior to the occurrence of SCK and remain LOW until
after the last SCK clock pulse. The rising edge of SCK
facilitates the input data of SDI being shifted into an 8-bit
shift register. When the shift register is full this data will be
loaded into a row address register, column address
register or into one of the internal RAM bytes.
PCB8517
Table 1 shows the switching characteristics when the
HFLB pin has a pulse presented, but when there is no
horizontal sync pulse present on the HFLB pin, the
transmission bit rate will be slowed down to 500 kbit/s.
Table 1
Switching characteristics (under operating
conditions)
PARAMETER
EN to SCK hold time
SCK LOW time
SCK HIGH time
SDI data set-up time
SDI data hold time
MIN. MAX. UNIT
−
−
−
−
−
−
ns
ns
ns
ns
ns
ns
100
200
200
200
100
SYMBOL
t
su(EN)
t
h(EN)
t
SCKL
t
SCKH
t
su(SDI)
t
h(SDI)
EN to SCK set-up time 200
handbook, full pagewidth
EN
tSCKL
tSCKH
tsu(EN)
th(EN)
SCK
tsu(SDI)
th(SDI)
SDI
B7
MSB
first byte
B0
LSB
last byte
MGD764
B7
B7
B0
B7
B0
Fig.3 3-wire serial interface protocol.
1997 Mar 03
5
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