STV9421

Features:

` CMOS SINGLE CHIP OSD FOR MONITOR
` BUILT IN 1 KBYTE RAM HOLDING:
  - PAGES'DESCRIPTORS
  - CHARACTER CODES
  - USERDEFINABLE CHARACTERS
` 128 ALPHANUMERIC CHARACTERS OR GRAPHIC SYMBOLS IN INTERNAL ROM (12 x 18 DOT MATRIX)
` UP TO 26 USER DEFINABLE CHARACTERS
` INTERNAL HORIZONTAL PLL (15 TO120kHz)
` PROGRAMMABLE VERTICAL HEIGHT OF CHARACTER WITH A SLICE INTERPOLATOR TO MEET MULTI-SYNCH REQUIREMENTS
` PROGRAMMABLE VERTICAL AND HORI ZONTAL POSITIONING
` FLEXIBLESCREEN DESCRIPTION
` CHARACTER BY CHARACTER COLOR SELECTION (UP TO 8 DIFFERENT COLORS)
` PROGRAMMABLE BACKGROUND (COLOR,TRANSPARENT OR WITH SHADOWING)
` CHARACTER BLINKING
` 2-WIRES ASYNCHRONOUS SERIAL MCU INTERFACE (I²C PROTOCOL)
` 4 x 8 BITS PWM DAC OUTPUTS ON THE STV9421
` SINGLE POSITIVE5V SUPPLY



Pinout

Specifications

Symbol	Parameter	Value	Unit
VDD	Supply Voltage	-0.3, +7.0	V
VIN	Input Voltage	-0.3, +7.0	V
Toper	Operating Ambient Temperature	0, +70
Tstg	Storage Temperature	-40, +125

Description

The STV9421 is an ONSCREEN DISPLAY for monitor. STV9421 is built as a slave peripheral connected to a host MCU via a serial I²C bus. It includes a display memory, controls all the display attributes and generates pixels from the data read in its on chip memory. The line PLL and a special slice interpolator allow to have a display aspect which does not dependon theline and framefrequencies.I²C interface allows MCU to make transparent internal access to prepare the next pages during the display of the current page. Toggle from one page to another by programming only one register.

4 x 8 bits PWM DAC are available (STV9421) to provide DC voltage control to other peripherals.The STV9420/21provides the user an easy to use and cost effective solution to display alphanumeric or graphic information on monitor screen.