Description

Electronic Component Model: SDA5255-A008 is an IC chip that belongs to the product category of electronic components. It is part of the SDA 525x series and is an upgraded version of its predecessors. The chip features a slicer for VPS and TTX, an accelerating acquisition hardware module, a display generator for "Level 1.5" TTX data, and an 8-bit microcontroller with a cycle time of 333 ns. The microcontroller handles most of the internal processing of TTX acquisition and is responsible for transferring data to/from the external memory interface and communicating via the I2C user interface. The SDA 525x-2 has a VBI buffer that can store up to 746 bytes of TTX data. The microcontroller firmware performs various acquisition tasks such as hamming- and parity-checks, page search, and evaluation of header control bits.

Specifications and features

• Acquisition:
  • Feature selection via special function register
  • Simultaneous reception of TTX, VPS, and WSS
  • Fixed framing code for VPS and TTX
  • Acquisition during VBI
  • Direct access to VBI RAM buffer
  • Acquisition of packets x/26, x/27, 8/30 (firmware)
  • Assistance of all relevant checks (firmware)
  • 1-bit framing code error tolerance (switchable)
• Display:
  • Features selectable via special function register
  • 50/60 Hz display (optional 100 Hz)
  • Level 1.5 serial attribute display pages
  • Blanking and contrast reduction output
  • 8 direct addressable display pages for SDA 5250-2, SDA 5254-2 to SDA 5257-2 (optional 10 pages)
  • 1 direct addressable display page for SDA 5251-2 to SDA 5253-2
  • 12 × 10 character matrix
  • 96 character ROM (standard G0 character set)
  • 156 national option characters for 12 languages (for European version)
  • 288 characters for X/26 display
  • 64 block mosaic graphic characters
  • 32 characters for OSD in expanded character ROM + 32 characters inside OSD box
  • Conceal/reveal
  • Transparent foreground/background - inside/outside of a box
  • Contrast reduction inside/outside of a box
  • Cursor (color changes from foreground to background color)
  • Flash (flash rate 1s, not depending on field rate)
  • Programmable horizontal and vertical sync delay
  • Full screen background color in outer screen
  • Double size/double width/double height characters
• Synchronization:
  • Display synchronization to sandcastle or Horizontal Sync (HS) and Vertical Sync (VS)
• Microcontroller:
  • 8 bit C500-CPU (8051 compatible)
  • CPU-clock 18 MHz, external 6-MHz-crystal
  • 333 ns instruction cycle
  • Parallel 8-bit data and 16 … 19-bit address bus (ROMless-Version)
  • Eight 16-bit data pointer registers (DPTR)
  • Two 16-bit timers
  • Watchdog timer
  • Capture compare timer for infrared remote control decoding
  • 256 bytes on-chip RAM
  • 8 KByte on-chip display-RAM (access via MOVX) SDA 5250-2, SDA 5254-2 to SDA 5257-2 (optional 10 Kbyte)
  • 1 Kbyte on-chip display-RAM (access via MOVX) for SDA 5251-2 to SDA 5253-2
  • 1 Kbyte on-chip ACQ-buffer-RAM (access via MOVX)
  • 1 Kbyte on-chip extended-RAM (access via MOVX) for SDA 5250-2 and SDA 5254-2 to SDA 5257-2
  • 6 channel 8-bit pulse width modulation unit
  • 2 channel 14-bit pulse width modulation unit
  • 4 multiplexed ADC inputs with 8-bit resolution
  • One 8-bit I/O port with open drain output and optional I2C-Bus emulation
  • Two 8-bit multifunctional I/O ports
  • One 4-bit port working as digital or analog inputs
  • One 3-bit I/O port with optional RAM/ROM address expansion up to 512 Kbyte (ROMless-Version)
• Package Types:
  • P-SDIP-52-1/P-MQFP-64-1 package for ROM-Versions (SDA 5251-2 to SDA 5253-2, SDA 5254-2 to SDA 5257-2)
  • P-MQFP-80-1 package for ROMless-Version (SDA 5250M-2)
  • P-LCC-84-2 package for Emulator-Version (SDA 5250-2)
• Supply Voltage: 5 V

Application Scenarios

The SDA5255-A008 IC chip is commonly used in various electronic devices and applications that require TTX acquisition and display capabilities. It is suitable for use in televisions, set-top boxes, and other multimedia devices that support TTX functionality. The chip's flexible design and high-performance microcontroller make it a suitable choice for applications that require reliable and efficient TTX data processing and display.

Comparison

• High-performance microcontroller with dedicated hardware for TTX acquisition
• Simultaneous reception of TTX, VPS, and WSS
• Flexible feature selection via special function register
• Direct access to VBI RAM buffer
• Support for multiple display pages and character sets
• Programmable synchronization options
• Wide range of package options for different applications

• No serial port (UART) available in newer versions