Weltrend Semiconductor, Inc.
WT6802
Monitor OSD with Auto-calibration
Data Sheet
REV. 1.0
April, 9, 2001
The information in this document is subject to change without notice.
©Weltrend
Semiconductor, Inc. All Rights Reserved.
2F, No. 24, Indust E. 9
th
RD., Science-Based Industrial Park, Hsin-Chu, Taiwan
TEL:886-3-5780241 FAX:886-3-5794278.5770419 Email:support@weltrend.com.tw
WT6802
Weltrend Semiconductor, Inc.
Rev.1.0 Data Sheet
DESCRIPTION
WT6802 is designed to interface with a MCU to do the OSD (On Screen Display) function in CRT
Monitor, besides the fancy auto-calibration function is also included.
The on-chip PLL generates a wide-ranged system clock up to 60MHz to meet the resolution
requirements(OSD resolution is programmable) of different display modes. The full OSD screen
size is 30 columns x 15 rows, and the OSD position can be freely programmed by setting the
interal registers. Special functions include color font, character bordering, shadowing, blinking,
double height, double width, all blanking effect, row to row spacing control, 4 windows with
shadowing, and programmable fin in/fan out effect.
WT6802 has 8 channels of PWM DAC, each PWM DAC can be respectively controlled by an 8-bit
register which contains a 5-bit PWM and 3-bit BRM, and the PWM clock is also programmable.
The horizonal back/front porch and vertical black/front porch data can be read by MCU through the
I
2
C bus in order to do the horizontal size/center and vertical size/center auto-calibration.
FEATURES
sInput
horizontal synchronous frequency … … .15k-130kHZ
sDot
Frequency generated by On-chip PLL … ..up to 160MHz
sResolution
… … … programmable, up to 2040 dots/line
sScreen
… … … … … … … … … ..30 columns x 15 rows
sCharacter
… ..12(H) x 18(V) dot matrix
Fonts … … … … 512 characters and 16 color fonts
2
MCU interface
I C bus
sColor(R,
G, B with intensity attribute)
Character foreground
8(R, G, B)
Character background
7(no blank)
Window
8(R, G, B)
Window shadowing
8(R, G, B)
s
PWM DAC
8 channels
sRow
to row spacing control
sDouble
character height and width
sProgrammable
character height control 18-69 lines
sCharacter
blinking, bordering(or shadowing)
s4
programmable background windows with multi-level operation
sHorizontal/vertical
size and center Auto-calibration
2
2F, No. 24, Industry E. 9
th
RD., Science-Based Industrial Park, Hsin-Chu, Taiwan
TEL:886-3-5780241 FAX:886-3-5794278.5770419 Email:support@weltrend.com.tw
WT6802
Weltrend Semiconductor, Inc.
Rev.1.0 Data Sheet
PIN CONFIGURATION
RI 1
NC 2
VSSA 3
VDDA 4
VCO 5
VDDA 6
HS 7
NC 8
SDA 9
SCL 10
20
19
18
17
16
15
14
13
12
11
GI
BI
VSS
R
G
B
BLANK
TEST
VS
VDD
WT6802
WT6802 (DIP-20)
VSSA 1
NC 2
VCO 3
VDDA 4
HS 5
NC 6
SDA 7
SCL 8
PWM6 9
PWM4 10
PWM2 11
PWM0 12
WT6802
24
23
22
21
20
19
18
17
16
15
14
13
VSS
R
G
B
BLANK
TEST
VS
VDD
PWM7
PWM5
PWM3
PWM1
WT6802 (DIP-24, 300mil)
RI 1
NC 2
VSSA 3
NC 4
VCO 5
VDDA 6
HS 7
NC 8
SDA 9
SCL 10
PWM6 11
PWM4 12
PWM2 13
PWM0 14
WT6802
28
27
26
25
24
23
22
21
20
19
18
17
16
15
GI
BI
VSS
R
G
B
BLANK
TEST
VS
VDD
PWM7
PWM5
PWM3
PWM1
VSSA 1
NC 2
VCO 3
VDDA 4
HS 5
NC 6
SDA 7
SCL 8
WT6802
16 VSS
15 R
14 G
13 B
12 BLANK
11 TEST
10 VS
9 VDD
WT6802 (DIP-16)
WT6802 (DIP-28, 300mil)
3
2F, No. 24, Industry E. 9
th
RD., Science-Based Industrial Park, Hsin-Chu, Taiwan
TEL:886-3-5780241 FAX:886-3-5794278.5770419 Email:support@weltrend.com.tw
WT6802
Weltrend Semiconductor, Inc.
Rev.1.0 Data Sheet
PIN DESCRIPTION
PIN No
28
pin
1
2
3
24
pin
--
--
1
20
pin
1
2
3
16
pin
--
--
1
RI
NC
VSSA Analog
ground
No
NC connectio
n
VCO
VDDA
VCO
__
Red Input
input
Video Red input from Pre-AMP
Symbol Pin Name
Input/
output
Description
4
5
6
7
2
3
4
5
4
5
6
7
2
3
4
__
__
Connected to external loop filter circuit
8
9
10
6
7
8
8
9
10
11~18 9~16
--
19
20
21
22
17
18
19
20
11
12
13
14
Analog
__
+5 V
power
Horizonta
5
HS l
Input
Horizontal synchronous input signal
SYNC
No
6
NC connectio
__
n
Serial
Input/out
2
7
SDA
I C data
data
put
Serial
8
SCL
input
I
2
C clock
clock
8 channels of 8-bit PWM DAC. Refer to pin
PWM0~ PWM
assignment in
--
output
PWM7 DACs
page1 for each PWM DAC’s pin
assignment.
Digital
9
VDD
__
+5 V
power
Vertical
10
VS
input
Vertical synchronous input signal
SYNC
11
12
TEST
TEST
output
output
5
Output test only
Blank signal output
BLANK Blank
2F, No. 24, Industry E. 9
th
RD., Science-Based Industrial Park, Hsin-Chu, Taiwan
TEL:886-3-5780241 FAX:886-3-5794278.5770419 Email:support@weltrend.com.tw
WT6802
Weltrend Semiconductor, Inc.
Rev.1.0 Data Sheet
23
24
25
26
27
28
21
22
23
24
--
--
15
16
17
18
19
20
13
14
15
16
--
--
B
G
R
VSS
BI
GI
Blue
output
Green
output
Red
output
Digital
Ground
Blue
input
Green
input
output
output
output
Blue signal output
Green signal output
Red signal output
input
input
Video Blue input from Pre-AMP
Video Green input from Pre-AMP
6
2F, No. 24, Industry E. 9
th
RD., Science-Based Industrial Park, Hsin-Chu, Taiwan
TEL:886-3-5780241 FAX:886-3-5794278.5770419 Email:support@weltrend.com.tw
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