ILI9225數據手冊

1. Introduction ILI9225 is a 262，144-color one-chip SoC driver for a-TFT liquid crystal display with resolution of 176RGBx220 dots， comprising a 528-channel source driver， a 220-channel gate driver， 87120 bytes RAM for graphic data of 176RGBx220 dots， and power supply circuit. ILI9225 has four kinds of system interfaces which are i80/M68-system MPU interface （8-/9-/16-/18-bit bus width）， serial data transfer interface （SPI） and RGB 6-/16-/18-bit interface （DOTCLK， VSYNC， HSYNC， ENABLE， DB［17:0］）。

In RGB interface， the combined use of high-speed RAM write function and widow address function enables to display a moving picture at a position specified by a user and still pictures in other areas on the screen simultaneously， which makes it possible to transfer display the refresh data only to minimize data transfers and power consumption.

ILI9225 can operate with low I/O interface power supply up to 1.65V， with an incorporated voltage follower circuit to generate voltage levels for driving an LCD. The ILI9225 also supports a function to display in 8 colors and a standby mode， allowing for precise power control by software. These features make the ILI9225 an ideal LCD driver for medium or small size portable products such as digital cellular phones or small PDA， where long battery life is a major concern. 2. Features ? Single chip solution for a liquid crystal QCIF+ TFT LCD display ? 176RGBx220-dot resolution capable of graphics display in 262，144 color ? Incorporate 528-channel source driver and 220-channel gate driver ? Internal 87，120 bytes graphic RAM ? High-speed RAM burst write function ? System interfaces ? i80 system interface with 8-/ 9-/16-/18-bit bus width ? M68 system interface with 8-/ 9-/16-/18-bit bus width ? Serial Peripheral Interface （SPI） ? RGB interface with 8-/16-/18-bit bus width （VSYNC， HSYNC， DOTCLK， ENABLE， DB［17:0］） ? n-line liquid crystal AC drive： invert polarity at an interval of arbitrarily n lines （n： 1 ~ 64） ? Internal oscillator and hardware reset ? Reversible source/gate driver shift direction ? Window address function to specify a rectangular area for internal GRAM access ? Bit operation function for facilitating graphics data processing ? Bit-unit write data mask function ? Pixel-unit logical/conditional write function ? Abundant functions for color display control ? γ-correction function enabling display in 262，144 colors ? Line-unit vertical scrolling function ? Partial drive function， enabling partially driving an LCD panel at positions specified by user