NT6828
I
2
C Bus Controlled On-Screen Display
1
V2.1
Features
T
I
2
C Bus Interface with Slave Address $7A (Receiver
Only)
T
Horizontal Frequency Range: 30KHz ~ 120KHz
T
Flexible Display Resolution: up to 1524 dots per row
T
Internal PLL Generating a Stable and Wide-Ranged
System Clock (92.2 MHz)
T
OSD Screen Comprising of Character Arrays of 15
Rows by 30 Columns
T
12 X 18 Dot Matrix Per Character
T
Total of 256 Fonts Including 248 ROM Fonts and 8
RAM Fonts
T
Programmable Vertical and Horizontal Position
Adjustment for OSD Display Position
T
8-Color Selection for Each Character and 8-Color
Control on Each Row with Overlapped by Windows
T
Character Blinking, Shadowing & Bordering Display
Effects
T
Double Character Height and Width for Each Row
T
Programmable Height of Characters Display
T
Row To Row Spacing Control
T
Four Overlapping and Programmable Windows with 8-
Color Control
T
Hsync & Vsync Input Polarity Selectable
T
8 Channels PWM DAC with 8 bits resolution & Open-
Drain Output Structure
T
16 DIP and 24 Skinny DIP packages
General Description
NT6828 is designed for displaying symbols and
characters onto a CRT monitor. Its operation is controlled
by the micro-controller with I2C bus interface. By sending
the proper data and commands to NT6828, it can carry
out the full screen display automatically while the time
base is generated by the on-chip PLL circuit. There are
many functions provided on this chip to fully support
numerous user applications. These functions are:
adjustment of OSD windows position, built-in ROM &
RAM fonts, variable character height with row-to-row
spacing adjustment, 8 color selections for each character,
double height/width controls for each row, four available
overlapping windows with color & size controls, as well as
other I/O interfaces to compliment an external video
chipset.
NT6828 provides eight optional PWM channels with 8-bit
resolution for external digital to analog control.
Pin Configurations
A G N D
V C O
A V C C
H F L B
N . C .
S D A
S C L
D V C C
P W M / H F T O N
F B K G
G
B
R
D G N D
V F L B
NT6828
1
2
3
4
5
6
7
8
9
1 0
1 1
1 2
1 3
1 4
1 5
1 6
R P
16 DIP
24 Skinny DIP
NT6828K
1
2
3
4
5
6
7
8
9
1 0
1 1
1 2
1 7
1 8
1 9
2 0
2 1
2 2
2 3
2 4
1 3
1 4
1 5
1 6
D V C C
P W M / H F T O N
F B K G
G
B
R
D G N D
V F L B
P W M 4
P W M 6
P W M 7
P W M 5
A G N D
V C O
A V
DD
H F L B
N . C .
S D A
S C L
R P
P W M 0
P W M 1
P W M 2
P W M 3
NT6828
3
Pin Description
Pin No.
16 Pin
24 Pin
Designation
I/O/P/R
Description
1
1
AGND
P
Analog Ground
2
2
VCO
-
Voltage I/P to Control Oscillator
3
3
RP
-
Bias Resistor. (To be used as a bias internal VCO to
resonate at the specific range of pixel clock)
4
4
AVCC
P
Analog Power Supply (5V Typ.)
5
5
HFLB
I
Horizontal Fly-back Input (Schmitt Trigger Buffer)
6
6
N.C.
-
-
7
7
SDA
I
SDA Pin Of I
2
C Bus (Schmitt Trigger Buffer) with internal
100K ohm pulled-high resistance
8
8
SCL
I
SCL Pin Of I
2
C Bus (Schmitt Trigger Buffer) with internal
100K ohm pulled-high resistance
9
PWM0
O
5V PWM Channel 0. Open-drain output structure
10
PWM1
O
5V PWM Channel 1. Open-drain output structure
11
PWM2
O
5V PWM Channel 2. Open-drain output structure
12
PWM3
O
5V PWM Channel 3. Open-drain output structure
12
PWM4
O
5V PWM Channel 4. Open-drain output structure
14
PWM5
O
5V PWM Channel 5. Open-drain output structure
15
PWM6
O
5V PWM Channel 6. Open-drain output structure
16
PWM7
O
5V PWM Channel 7. Open-drain output structure
9
17
DVCC
P
Digital Power Supply (5V Typ.)
10
18
VFLB
I
Vertical Fly-back Input (Schmitt Trigger Buffer)
11
19
PWM/
HFTON
O
PWM output or gain controlled of R,G,B channels.
12
20
FBKG
O
Fast Blanking Output. (To be used as switching signal for the
R,G,B OSD video signals.)
13
21
B
O
Blue Color Output with Push-Pull Output Structure
14
22
G
O
Green Color Output with Push-Pull Output Structure
15
23
R
O
Red Color Output with Push-Pull Output Structure
16
24
DGND
P
Digital Ground
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