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Item Item Details
SV2000 Video IC Item Name:
SV2000 Video IC
Item #:
SV2000
Price/ea:
$21.99
$20.89 (2 - 9)
$19.79 (10 - 20)

  • Tiny 8 Pin DIP Package
  • Generates RS170 (US NTSC Compatable) and CCIR (EU PAL Compatible) monochrome video
  • 16x9 character display.
  • 9600,8,N,1 TTL level Normal or inverted mode.   
  • Save/Restore Screen function
  • 3 Programmable Fonts
  • Simple connection to PC serial port
  • Power supply: +5V, typical consumption 12 mA typical, 25 mA maximum

 

Command Set

 

The  SV2000 uses 9600 baud rate and 8N1 serial protocol. Any received ASCII characters are printed on screen, except for commands that begin with the escape code (ASCII 27). When the cursor reaches the right lower corner, the existing text is scrolled up one line. On power up, the SV2000 starts with the last saved text and state.

 

List of commands:

 

Command

Esc code

Dec. code

Description

Standard Commands

No operation

 

9,11,12,14

Chip ignores these codes

Carriage Return

CR

13

Moves cursor to beginning of line

Line Feed

LF

10

Line Feed

Backspace

BS

8

Delete last character

Clear Screen

ESC C

27,67

Clear screen

Set Cursor Position

ESC S x y

27,83,x,y

Move cursor to position X, Y

Set Cursor Home

ESC H

27,72

Set cursor to 0, 0

Show Cursor

ESC T

27,84

Show cursor

Hide Cursor

ESC F

27,70

Hide cursor

Select Font 1

ESC 1

27,49

Select Font 1

Select Font 2

ESC 2

27,50

Select Font 2

Select Font 3

ESC 3

27,51

Select Font 3

Special Commands

Show version info

ESC *

27,42

Turns on the screen, set Font1, shows the welcome banner on screen

Get device ID

ESC ?

27,63

Returns the device ID and version number

Screen ON

ESC +

27,43

Turn Screen on (Screen defaults to on)

Screen OFF

ESC -

27,45

Turn Screen off

Normal mode

ESC .

27,46

Set white characters on black background (for all text)

Inverted mode

ESC !

27,33

Set black characters on white background (for all text)

PAL/SECAM mode

ESC >

27,62

Set CCIR-based mode (624 lines, 50 fps  Europe)

NTSC mode

ESC <

27,60

Set RS170-based mode (524 lines, 60 fps US)

Set Vertical Position

ESC V x

27,86,x

Adjust vertical position of text, x=0…31 lines, Defaults to 16

Save/Restore and Font Command

Save current state*

ESC ^

27,94

Save screen text and current state to FLASH

Restore saving state*

ESC _

27,95

Restore screen text and current state from FLASH

Send data to buffer

ESC @ ...

27,64,d1, ...

d1...d64–data, d65 is CRC (not used, any value)

Write buffer to FLASH*

ESC # x x

27,35,x,x

x-number of FLASH block from 0...143 (x is multiplied by 2)

 

Note. The commands marked by * require additional processing time (approx 20ms) before the next command can be sent.

 

Pin Description

 

Pin #

Name

Description

1

Syn

Sync Out

2

Vid

Video Out

3

Rx

Serial Input

4

Gnd

Ground/Earth

5

Tx

Serial Out

6

Inv

Normal or Inverted Serial communications mode. (Normal=+5v, invented= gnd)

7

n/c

not used

8

+5V

Power supply

 

 

Connection

 

The  SV2000 requires 3 external resistors (R1, R2, and R3) to create composite video from separate video and sync signals. The arrangement in the schematic below produces a 1V peak-to-peak signal. TV input impedance is usually 75 ohm which will decrease the resulting range somewhat. Some TV devices have automatic gain tuning, however adjustment of R2 or R3 may required.

 

RX Pin 3 is used as the serial data input.  The input mode is selected by tying Pin 6 to +5v volts for normal operation or ground for inverted operation.  In normal mode, the SV2000 works with any TTL source (i.e. MAX232 line driver etc.).

 

The SV2000 can be directly connected to a PC Com port by tying pin 6 to ground to enable inverted mode and adding additional 10k resistors on TX Pin 5 and RX Pin 3.  The voltage range on pin 3 is limited by the SV2000 PC's internal protective diodes.  Not all older PC's will work with this method however, it is provided to allow fast prototyping.

 

Note. The SV2000 has high impedance for data input (RX pin 3), so it must be connected. Provide a pull up resistor for normal mode or a pull down resistor for inverted mode) Suggested resistor values are between 100 and 1M Ohm.

 

The SV2000 sends character code 255 once every second to the serial output, TX Pin 5.  This signal can be used to determine if the SV2000 is connected and working.

 

SV2000 Datasheet (word doc)

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