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PDF NT68275 Data sheet ( Hoja de datos )
| Número de pieza | NT68275 | |
| Descripción | IIC Bus Controlled On-Screen Display | |
| Fabricantes | ETC | |
| Logotipo |  |
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NT68275
IIC Bus Controlled On-Screen Display
Features
n IIC Bus Interface with Slave Address $7A (Transmitter)
& $7B (Receiver)
n Horizontal Frequency Range: 30KHz ~ 150KHz*
n Flexible Display Resolution Up to 1524 Dots/Row
n Internal PLL Generates a Stable and Wide-Ranged
System Clock (120 MHz)*
n OSD Screen Consist Character Array of 15 Rows by
30 Columns
n Programmable Vertical and Horizontal Position for
OSD Displaying Center
n Total of 528* ROM Fonts including 512* Standard &
16 Multi-color ROM Fonts.
n 12 X 18 Dot Matrix Per Character
n 8-Color Selection for Each Character
n 7-Color Selection for Each Character Background
n Character/Symbol Blinking, Shadowing & Bordering
Display Effect
n Double Character Height and Width for Each Row
n Programmable Height of Character/Symbol Display
n Row To Row Spacing Control to Avoid Expansion
Distortion
n Four Programmable Windows with Overlapping
Capability and Shadowing Effect
n Color Setting for Windows’ Background and Character
Shadowing & Bordering
n Fade-In/Out Effect of OSD Screen Display
n Hsync & Vsync Input Polarity Selectable
General Description
NT68275 is designed for displaying symbols and
characters onto a CRT monitor. Its operation is controlled
by a microcontroller with an IIC bus interface. By sending
proper data and commands to NT68275, it can carry out
the full screen display automatically with the time base
generated by an on-chip PLL circuit. There are many
functions provided by this chip to fully support user
applications, such as: adjustment of the position of OSD
The “ * “ sign denotes that feature different from NT6827.
windows , built-in 512* ROM & 16 multi-color fonts,
variable character height with row-to-row spacing
adjustment, 8 color selections & 7 background color
controls for each character, double height/width controls
for each row, 4 overlapping window available with color &
size controls, size controls for each window shadowing,
color selection for windows’ shadowing & character
shadowing/ bordering, fade-in/out display effect, etc.
1 V1.0
1 page  
DC/AC Absolute Maximum Ratings*
Recommended Operating Conditions
VCC (measured to GND) . . . . . . . . . .. . 4.75V to 5.25V
Operating Temperature . . . . . . . . . . . . . 0 to +70 0C
NT68275
*Comments
Stresses above those listed under "Absolute
Maximum Ratings" may cause permanent damage to
this device. These are stress ratings only. Functional
operation of this device at these or any other
conditions above those indicated in the operational
sections of this specification is not implied or
intended. Exposed to the absolute maximum rating
conditions for extended periods may affect device
reliability.
Electrical Characteristics (VDD = 5V, Tamb = 25° C)
Symbol
Parameter
VCC Supply Voltage
Min. Typ. Max.
4.75 5 5.25
Unit
V
Notes
DC Characteristic
Symbol
IDD
VIH1
Parameter
Operating Current
Input High Voltage
VIL1
VIH2
VIL2
Input Low Voltage
IIC Bus Input High Voltage
IIC Bus Input Low Voltage
Min. Typ. Max.
22 25
2
0.8
3
1.5
Unit
mA
V
V
V
V
Notes
No loading
VFLB, HFLB with
Schmitt Trigger Buffer
VFLB, HFLB Schmitt
Trigger Buffer
SCL, SDA
Idrive1
Isink1
Ileak
Iiicl
Vth
VSTIH
VSTIL
Iin
Driving current of R, G, B, FBKG, HFTON
output pins at 2.4V output voltage
80
Sinking current of R, G, B, FBKG, HFTON
output pins at 0.4V output voltage
20
Leakage current of R, G, B, FBKG pins at
Hi-Z state
10
IIC Bus Output Sink Current
5
Input Threshold Voltage at HFLB & VFLB 1.8 2.0 2.2
Schmitt Trigger Input High Voltage
1.7 2
Schmitt Trigger Input Low Voltage
0.8 1.1
Input Current of Hsync, Vsync, SDA, SCL
pins
-10
+10
mA
mA
uA Measured at 2.5V state
mA Viicoutl = 0.4V
V
V
Refer Figure 1
V
uA Schmitt Trigger Buffer
5
5 Page 
NT68275
List of Control Registers:
(1) Display Register: Row 0 – 14 , Column 0 – 29
Row 0-14
Column 0-29
87
*Page MSB
6543
Font’s Address $00 - $1FF
2
10
LSB
Bit 8: * Page - This bit will address the page 1 ROM font area by bit 7-0 of this control register. Otherwise, it
will address page 0. This can be set by the bit5 column data at IIC bus transmission. Refer to
Figure 8-1 & 8-3 for ROM font area.
Bit 7-0: These eight bits will address one of the 256 characters/ symbols residing in the character ROM fonts.
Note that if user sets MCFONT bit (row 15, column 22) to ‘1’, the 0 ~ 256 will address standard ROM
fonts, and if cleared to ‘0’, the 0 ~ 239 will address standard ROM fonts & 240 ~ 255, multi -color ROM
fonts.
(2) Character Attribute Register: Row 0 – 14, Column 0 – 29
Row 0-14
Column 0-29
765432
BKR BKG BKB BLINK R
Character Attribute Control
1
G
0
B
Bit 6-4: BKR/G/B -These three bits define the color attribute of the background for the corresponding
character/symbol. If all three bits are cleared, no background will be displayed. Refer to the
TAB 3 for the color selections.
Bit 3: BLINK - This bit enables the blinking effect of the corresponding character/symbol with this bit set to
‘1’. The blinking frequency is approximately 1Hz with a fifty-fifty duty cycle at 80Hz vertical sync
frequency.
Bit 2-0: R/G/B -These three bits define the color attribute of the corresponding character/symbol. Refer to the
TAB 2 for the color selections.
TAB 2. Character/Window Color Selection
TAB 3. Character/Window Background Color Selection
COLOR R G B
Black 0 0 0
Blue
001
Green 0 1 0
Cyan
011
Red 1 0 0
Magenta
1
0
1
Yellow 1 1 0
White 1 1 1
COLOR
RGB
No Background
0
0
0
Blue
001
Green
010
Cyan
011
Red 1 0 0
Magenta
101
Yellow
110
White
111
11
11 Page | ||
| Páginas | Total 38 Páginas | |
| PDF Descargar | [ Datasheet NT68275.PDF ] | |
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