Samsung KS2508 Datasheet

Preliminary

ORDERING INFORMATION

KS2508 OSD PROCESSOR FOR MONITOR

OVERVIEW

The KS2508 is used to display some characters or symbols on a screen of monitor. Basically, the operation is to control the internal memory on chip and generate the R,G,B signals for some characters or symbols. The R,G,B signals are synchronized with the horizontal sync. Then the R,G,B signals are mixed with the main video signal in the Video Amp IC. The font data for characters or symbols are stored in the internal ROM. This stored data are accessed and controlled by the control data from a micro controller. The control data are transmitted through the I2C bus. All timing control signals including the system clock are synchronized with the horizontal sync. Therefore there is a PLL circuitry on chip.

FEATURES

• 256 ROM fonts (Each font consists of 12 x 18 dots.)

• Full Screen Memory Architecture

• Wide range PLL available (15 kHz ~ 120 kHz)

• Programmable vertical height of character

16-DIP-300

Device Package Operating Temperature

KS2508 16-DIP-300 0°C ~ 70°C

• Programmable vertical and horizontal positioning

• Character color selection up to 16 different colors

• Programmable background color (Up to 16 colors)

• Character blinking, bordering and shadowing

• Color blinking

• Character scrolling

• Fade-in and fade-out

• Box drawing

• Character sizing up to four times

• 96 MHz pixel frequency from on-chip PLL

• IIC Protocol Data Transmission (Slave Address : BAH)

Preliminary

KS2508 OSD PROCESSOR FOR MONITOR

BLOCK DIAGRAM

SDA

SCL

HFLB

VFLB

ROM

Addr

Display Control

Timing

Controller

Single Color ROM

(256 x 18x12)

Font

Data

Output

Stage

H/V/CLK Control

15 14 13

12 11

INT R_OU T G_OUT B_OUT FBLK

Control Data

Control

RAM Data

Frame

Row

Frame

Row

RAM

(480 x 16)

Font Control

Display

Controller

H/V/CLK Control

Data

Receiver

Control Register

CLK

OSD _PLL

H-Pulse

V-Pulse

2 3 5 1 4 10 16

VCO_IN

VREF1

VREF

VSS_A

VDD_A

VSS_D

VDD_D

Figure 1. Functional Block Diagram

Preliminary

KS2508 OSD PROCESSOR FOR MONITOR

PIN CONFIGURATIONS

VSS-A 1

VCO-IN

VREF1

VDD- A 4

VREF 5

HFLB

SDA

SCL 8

VDD _D16

INT

R_OUT

G_OUT13

KS2508

B_OUT12

FBLK

VSS_D

VFLB9

Figure 2. Pin Configurations

Preliminary

KS2508 OSD PROCESSOR FOR MONITOR

PIN DESCRIPTIONS

Table 1. Pin Descriptions

Pin No. Signal Active I/O Description

1 VSS_A - - Ground (Analog Part) 2 VCO_IN - Input This voltage is generated at the external loop filter and

goes into the input stage of the VCO.

3 VREF1 - Input 1.26 V DC Voltage from the Bandgap Reference.

Connected to ground through a resistor to make internal

reference current (Typical 36 KΩ for 27µA) 4 VDD_A - - +5 V Supply Voltage for Analog Part 5 VREF - Input Bandgap Reference Voltage (Typical 1.26 V) 6 HFLB Low Input Horizontal Flyback Signal 7 SDA - In/Out

8 SCL - In/Out 9 VFLB Low Input Vertical Flyback Signal

10 VSS_D - - Ground for Digital Part 11 FBLK - Output Fast Blank Signal 12 B_OUT - Output Video Signal Output (B) 13 G_OUT - Output Video Signal Output (G) 14 R_OUT - Output Video Signal Output (R) 15 INT - Output Intensity Signal Output 16 VDD_D - - +5 V SUpply Voltage for Dogital Part

Serial Data (I2C)

Serial Clock (I2C)

Preliminary

KS2508 OSD PROCESSOR FOR MONITOR

ABSOLUTE MAXIMUM RATINGS

Parameters Symbol Value Unit

Min. Typ. Max.

Maximum Supply Voltage VDD - - 7.0 V Input Voltage V

Operating Temperature Range T Storage Temperature Range T Power Dissipation P

OPR

STG

- - 7.0 V

-20 - 70

-40 125

- - 1200 mW

NOTE: PKG Thermal Resistance : 64.2 °C/W

ELECTRICAL CHARACTERISTICS

DC Electrical Characteristics

(Ta = 25 °C, VDD = 5 V)

Table 2. DC Electrical Characteristics

Parameters (Conditions) Symbol Min. Typ. Max. Unit

Supply Voltage VDD 4.75 5.00 5.25 V Supply Current

(No load on any output)

Input Voltage

V V

- - 25 mA

0.8VDD

- V

VSS + 0.4 V

°C °C

Output Voltage (lout = 1mA)

Input Leakage Current I VCO Input Voltage V

V V

VCO

0.8VDD

- -

-10

- V

VSS + 0.4 V

10 µA

2.5 V

Preliminary

KS2508 OSD PROCESSOR FOR MONITOR

OPERATION TIMINGS

Table 3. Operation Timings

Parameters (Conditions) Symbol Min. Typ. Max. Unit

Output Signal - R/G/B_OUT, INT, FBLK (Ta = 25°C VDDA = VDD = 5 V , CLOAD = 30pF)

Rise Time t Fall Time t

Input Signal - HFLB, VFLB

Horizontal Flyback Signal Frequency f Vertical Flyback Signal Frequency f

I2C Interface - SDA, SCL (Refer to Figure 3) SCL Clock Frequency f

Hold Time for start condition t Set Up Time for stop condition t Low Duration of clock t High Duration of clock t Hold Time for data t Set Up Time for data t Time between 2 access t Fall Time of SDA t

HFLB

VFLB

SCL

sus

low

high

sud

fSDA

- - 6 nsec

- - 120 kHz

- - 200 Hz

- - 300 kHz 500 - - ns 500 - - ns 400 - - ns 400 - - ns

0 - - ns 500 - - ns 500 - - ns

- - 20 ns

Rise Time of both SCL and SDA t

SDA

SCL

high

sud

Figure 3. I2C Bus Timing Diagram

low

rSDA

- - - ns

Preliminary

KS2508 OSD PROCESSOR FOR MONITOR

FUNCTIONAL DESCRIPTIONS

Data Transmission to the KS2508

According to the I2C protocol, the KS2508 receives the data from a micro controller. The SDA line and the SCL line are shown in Figure 4. As shown in Figure 4, after the starting pulse, the slave address with R/W* bit and an acknowledge are transmitted in sequence, an internal register address of the KS2508 is followed. The first 8-bit byte is the upper 8bits of the register address. The lower 8bits of the register address are followed after the second acknowledge. There is a data transmission format and are two address bit patterns in the KS2508 as following. The slave address of the KS2508 is BAH(in hexadecimal).

Data Transmission Format

Row Address -> Column Address -> Data Byte N -> Data Byte N+1 -> Data Byte N+2 -> ....

Address Bit Pattern for Display Registers Data

(a) Row Address Bit Pattern R3 - R0: Valid Data for Row Address

A15 A14 A13 A12 A11 A10 A9 A8

X X X X R3 R2 R1 R0

(b) Column Address Bit Pattern C4 - C0: Valid Data for Column Address

A7 A6 A5 A4 A3 A2 A1 A0

X X X C4 C3 C2 C1 C0

After addressing, data bytes are followed as the above data transmission format. The Figure 4 describes the data transmission with the I2C bus protocol.

SCL SDA

START IIC SLAVE ADDRESS ACK MSB ADDRESS ACK LSB ADDRESS ACK

SCL

D1 D0D2D3D4D5D6D7

DATA BYTE N(MSB DATA)

R/W

D1 D0D2D3D4D5D6D7SDA D1 D0D2D3D4D5D6D7

ACK DATA BYTE N(MSB DATA) ACK STOPACK DATA BYTE N(LSB DATA)

A5 A4 A3 A2 A1 A0A6A7A9 A8A10A11A12A13A14A15

...

Figure 4. SDA line and SCL line (Write Operation)

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