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LT8668EX


LONTIUM SEMICONDUCTOR CORPORATION
ClearedEdge? Technology

LT8668EX LCD Controller Data Sheet
Table of Contents
1. General Description................................

...................................................................4 1.1. Key Features.................................................................................................... 4 1.2. Applications...................................................................................................... 5 1.3. Absolute Maximum Ratings........................................................................... 6 2. Functional Block Description....................................................................................6 2.1. Application Diagram........................................................................................ 6 2.2. Pin Configuration............................................................................................. 7 2.3. Pin Descriptions............................................................................................... 8 2.4. Major Function Block Descriptions............................................................. 13 2.4.1. VGA - ADC...........................................................................................13 2.4.2. Position Auto Adjust............................................................................14 2.4.3. Sync Process.......................................................................................14 2.4.4. Embedded HDMI Receiver................................................................14 2.4.5. Scaling.................................................................................................. 15 2.4.6. Color Enhance Processing................................................................ 15 2.4.7. OSD.......................................................................................................16 2.4.8. LVDS Driver......................................................................................... 20 2.4.9. Digital Audio Input/Output Interface................................................. 22 2.4.10. Two Wire Serial Bus Interface.........................................................23 2.4.11. OCM (On Chip Manager)................................................................. 25 3. Packaging..................................................................................................................25 3.1. ePad Enhancement.......................................................................................25 3.2. Package Dimensions.................................................................................... 26

1. General Description
The LT8668EX is Lontium’s second generation LCD controller that supports both VGA interface and the HDMI interface based on ClearEdge ? technology, compliant with the HDMI 1.4(High Definition Multimedia Interface) specification. It can also support Dual-Mode DP and MHL with HDMI interface. For backward compatibility, this LCD controller also includes a high performance analog interface to work with traditional VGA/YPbPr interface. With quad-LVDS ports it can support quad-LVDS ports monitor with 4Kx2K resolution. And dual-LVDS prots or single-LVDS port for other resolution. For total solution of LCD controller, LT8668EX integrates main functions include positon adjustment, programmable scalar, video processor (hue, saturation, brightness and contrast adjustment), OSD, gamma correction,

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PWM, MCU, total 16 GPIOs and nor-flash (optional). For easy implement of a multi-media system, LT8668EX supports 2-channel I2S audio input and 8-channel high quality I2S audio or SPDIF audio output. LT8668EX integrates 4M bits nor-flash inside, and also you can use external nor-flash by SPI interface for compatibility. The LT8668EX is offered in a 128-pin LQFP package, with operating temperature range of 10℃-70℃.

1.1. Key Features
HDMI/MHL Dual Mode Rx ? Direct interface to DVI 1.0 and HDMI V1.4 receiver ? Compliance with DVI up to 1.65Gbps and HDMI V1.4 up to 3.0Gbps ? Support MHL V2.0 on the same pins with HDMI ? Multiple pixel formats: RGB 6/8/10/12 bit per component (bpc); YCbCr 422/444 8/10/12 bpc ? High input sensitivity, with differential input level down to 80mV ? Receiver side equalization up to 12 dB ? Auto Loss of Signal detection ? High jitter tolerance up to 0.6UI ? HDCP decryption ? On-chip EDID ? Support input resolution up to 4Kx2K@30Hz Analog RGB/YPbPr Input Interface ? 1 channel Analog input supported ? On-chip EDID ? Integrated 8-bit triple-channel 165MHZ ADC/PLL ? Support RGB/YCbCr input ? Support SOG(Sync-On-Green) ? Auto adjusting true 64 phase ADC PLL ? Support input resolution up to 1080P Output Interface ? Qual channels LVDS output ports ? Single, double or qual pixel mode ? 24/48/96-bit panel mapping to the LVDS channels ? 18/36/72-bit panel mapping to the LVDS channels ? Programmable LVDS ports swapping ? Programmable channel swapping ? Support output resolution up to 4Kx2K@30Hz for ture 4K LCD ? Spread-Spectrum DPLL to reduce EMI ? RGB888/RGB666/RGB565 output On Chip Manager ? Embedded 51 Core, and is compatible with Standard 8051 instruction ? Up to 24K bytes on chip PRAM ? One external interrupt ? Embedded SPI master for external SPI flash ? Programmable digital PWM for backlight control

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? 8bit ADC for key pad control ? I2C BUS (slave mode) Scaling ? Fully programmable zoom ratios ? Independent horizontal/vertical scaling ? Advanced zoom algorithm provides high image quality Video Processing ? Programmable hue and saturation adjustment ? brightness and contrast control ? Programmable Color space conversion ? Programmable gamma correction support ? Advanced dithering logic for 18-bit panel color depth enahancement Audio Support ? 2-channel of analog audio input for the support of DVI ? Optional SPDIF output and 8-channel I2S output ? Supports PWM output for audio volume control On-chip OSD ? Embedded 15K SRAM dynamically stores OSD command and fonts ? Support multi-color RAM font, 1,2 and 4-bit per pixel ? 16 color pallette ? Programmable blinking effects for each character ? Programmable alpha-blending ? Optional 10x18~12x18 font matrix selection Other Features ? Support I2C slave debug mode ? Extensive power management for power savings ? Support total 16 GPIOs ? Integrated pattern generation ? Integrated nor-flash(optional)

1.2. Applications
? HD LCD computer Monitors ? HD LCD Monitors for medical and other applications? Multi-Media process and display control ? HDMI/MHL/VGA to LVDS Interface convertion

1.3. Absolute Maximum Ratings
Supply Voltage VDD33 …………… 3.0V to 3.6V VCCA33 …………… 3.0V to 3.6V VCCA18 …………… 1.7V to 1.90V VDD18 …………… 1.62V to 1.98V Operating Junction Temperature Range …………… -10°C to +70°C Storage Temperature Range …………… -10°C to +70°C

2. Functional Block Description
Figure 1 is functional block diagram of LT8668EX, and the block detail internal

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relationship is also shown in the diagram.

2.1. Application Diagram
Figure 2 is the normal application diagram of the HD-LCD controller chip. In the chip it include a triple ADC, a TMDS receiver, a Scalar, a MCU and associated interfaces, a on-chip OSD, and a qual LVDS driver for LCD panel interface. It also includes a digital audio interface, a PWM module for back light control. The interface with DisplayPort can be realized through the TMDS interface by adding an external level-shifter chipset. HDCP is also support.

2.2. Pin Configuration
Figure 3 is the pin diagram of the LT8668EX HD-LCD controller chip.

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