Weltrend Semiconductor, Inc.
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
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.
WT6802
Weltrend Semiconductor, Inc.
Rev.1.0 Data Sheet
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
2
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
s
Input horizontal synchronous frequency ... ... .15k-130kHZ
s
Dot Frequency generated by On-chip PLL ... ..up to 160MHz
s
Resolution ... ... ... programmable, up to 2040 dots/line
s
Screen ... ... ... ... ... ... ... ... ... ..30 columns x 15 rows
s
Character ... ..12(H) x 18(V) dot matrix
Fonts ... ... ... ... 512 characters and 16 color fonts
MCU interface I
2
C bus
s
Color(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
s
Row to row spacing control
s
Double character height and width
s
Programmable character height control 18-69 lines
s
Character blinking, bordering(or shadowing)
s
4 programmable background windows with multi-level operation
s
Horizontal/vertical size and center Auto-calibration
WT6802
Weltrend Semiconductor, Inc.
Rev.1.0 Data Sheet
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
3
PIN CONFIGURATION
WT6802
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
WT6802 (DIP-28, 300mil)
RI
NC
VSSA
NC
VCO
VDDA
HS
NC
SDA
SCL
PWM6
PWM4
PWM2
PWM0
GI
BI
VSS
R
G
B
BLANK
TEST
VS
VDD
PWM7
PWM5
PWM3
PWM1
WT6802
24
23
22
21
20
19
18
17
16
15
14
13
1
2
3
4
5
6
7
8
9
10
11
12
WT6802 (DIP-24, 300mil)
VSSA
NC
VCO
VDDA
HS
NC
SDA
SCL
PWM6
PWM4
PWM2
PWM0
VSS
R
G
B
BLANK
TEST
VS
VDD
PWM7
PWM5
PWM3
PWM1
WT6802
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
WT6802 (DIP-20)
RI
NC
VSSA
VDDA
VCO
VDDA
HS
NC
SDA
SCL
GI
BI
VSS
R
G
B
BLANK
TEST
VS
VDD
WT6802
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
WT6802 (DIP-16)
VSSA
NC
VCO
VDDA
HS
NC
SDA
SCL
VSS
R
G
B
BLANK
TEST
VS
VDD
WT6802
Weltrend Semiconductor, Inc.
Rev.1.0 Data Sheet
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
5
PIN DESCRIPTION
PIN No
28
pin
24
pin
20
pin
16
pin
Symbol Pin Name
Input/
output
Description
1
--
1
--
RI
Red Input
input
Video Red input from Pre-AMP
2
--
2
--
NC
3
1
3
1
VSSA Analog
ground
__
4
2
4
2
NC
No
connectio
n
__
5
3
5
3
VCO VCO
__
Connected to external loop filter circuit
6
4
6
4
VDDA
Analog
power
__
+5 V
7
5
7
5
HS
Horizonta
l
SYNC
Input
Horizontal synchronous input signal
8
6
8
6
NC
No
connectio
n
__
9
7
9
7
SDA Serial
data
Input/out
put
I
2
C data
10
8
10
8
SCL
Serial
clock
input
I
2
C clock
11~18 9~16
--
--
PWM0~
PWM7
PWM
DACs
output
8 channels of 8-bit PWM DAC. Refer to pin
assignment in
page1 for each PWM DAC's pin
assignment.
19
17
11
9
VDD Digital
power
__
+5 V
20
18
12
10
VS
Vertical
SYNC
input
Vertical synchronous input signal
21
19
13
11
TEST TEST
output Output test only
22
20
14
12 BLANK Blank
output Blank signal output
WT6802
Weltrend Semiconductor, Inc.
Rev.1.0 Data Sheet
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
6
23
21
15
13
B
Blue
output
output Blue signal output
24
22
16
14
G
Green
output
output Green signal output
25
23
17
15
R
Red
output
output Red signal output
26
24
18
16
VSS
Digital
Ground
27
--
19
--
BI
Blue
input
input
Video Blue input from Pre-AMP
28
--
20
--
GI
Green
input
input
Video Green input from Pre-AMP
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