WT8881数据手册Weltrend中文资料规格书

描述 Description

The WT8881/2 is a highly integrated digital controller for digital photo frame application. It supports both analog and digital TFT LCD panel outputs and provides basic digital photo frame functions, for example it can read JPEG file from SD/ MMC memory cards then through JPEG decoder to display in the LCD panel. This IC has total panel output and control functions, for example TCON, Vcom, Vgh/Vgl, LED B/L controller and touch panel controller etc. This IC and its application software provide clear picture and easy use user’s interface (UI) to communicate with users; users can use touch screen, key pad and remote controller to do function choice and browse pictures. Besides UI, decoding speed and picture quality are also important characteristics in this IC.

特性 Features

●Embedded Card reader for SD/MMC flash memory card
●JPEG decoder
 -Compliance to to ISO 10918-1
 -Throughput rate : 50MB/Sec
 -Support YCbCr 420, 422, and 444 format
 -User-definable Quantization and Huffman tables
 -Support image size up to 4K x 4K
●Support USB 1.1 host and device
●LCD panel interface
 -Triple 8-bit DACs output RGB signals for analog panel
 -18-bit RGB TTL signals for digital panel
 -Programmable timing controller for different type of panels
 -Programmable gamma table for panel compensation
●Display format conversion
 -Programmable horizontal and vertical zoom ratio
 -Support non-linear scaling for 4:3 to 16:9
 -Convert interlaced input to progressive
 -Good scaling down performance
 -Support picture rotation function
●Luminance and chrominance adjustment
 -Contrast adjustment with black/white level stretch
 -Brightness adjustment
 -Sharpness adjustment
 -Hue adjustment
 -Saturation adjustment
●Pixel and Character based OSD
 -Font size: 12x18 dots
 -Font ROM : 512 single color fonts
 -Display RAM : 512 x 16 bits (display up to 512 characters)
 -User-font RAM : 2048 x 24 bits (up to 226 single color fonts)
 -Shadow and border effect of character
 -Two or Three display windows
 -Programmable background window
 -Support alpha blending
 -Support blinking effect
 -Support fade in/out effect
 -Support pixel based icon and background (full size: 800x600x3)
 -Store pixel based image file in serial flash memory
 -Transfer pixel based image file to SDRAM by “DMA” engine
●MCU
 -Built-in 8051 CPU
 -Data memory : 2.25K bytes RAM
 -Support external program memory with serial flash memory via 4-wire interface
●6-channel 10-bit ADC for keypad scanning, sensor input, touch screen input or battery charger
●Build-in RTC (Real Time Clock)
●Two slave mode I2C interfaces, up to 400KHz
 -Interface for ISP, ICE and other I2C master
●Support Infra-Red remote control
●Reserve photo sensor frequency counter (for RGB LED B/L white balance adjusting)
●M/S IIC interface and Standard UART port (Reserved for connecting to external modules)
●Four 10 bit PWM outputs including one low frequency PWM
●Built-in self test pattern generator
●Programmable TCON (Timing Controller) and adjustable Vcom
●Two DC-DC boost circuits for VGH, VGL and LED back light
●General purpose I/Os
●Spread spectrum PLL for panel clock, lower EMI
●Low power consumption operating mode
●Power saving mode: Stand-by mode, off mode
●Embedded ISP, ICE
●Crystal oscillator
 -24MHz
●Package
 -LQFP 128, QFP 208
【 Application
●Digital Photo Frame