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  • Supports Embedded DisplayPort (eDP) Specification version 1.2.

  • Support 2 Main Link Lanes at either 1.62Gb/s or 2.7Gb/s link rate for notebook PC applications

  • Supports input color depth 6, 8-bit per pixel in RGB format

  • Supports Enhanced Framing Mode

  • Support VESA and CEA timing standards up to 1920x1200 resolution in 8-bit input with 60Hz refresh rate

  • Support dynamic refresh rate switching

  • Support Gamma correction

  • Panel tuning methods including dithering and 6-bit + FRC

  • Fast and full Link Training for embedded DisplayPort system

  • Support eDP Authentication: Alternative Scramble Seed Reset and Alternative Framing

  • 2 work modes: connect 27MHz crystal, inject 27MHz clock

  • Programmable LCD panel power sequence

  • Support 18-bit Single Port, 18-bit Dual Port , 24-bit Single Port and 24-bit Dual Port LVDS output interface

  • Support both OpenLDI and SPWG bit mapping for LVDS application

  • Support panel select by GPIO pins control or writing the chip registers.

  • Flexible LVDS output pins swapping

  • Blank panel during invalid input

  • Supports PWM. Backlight luminance level control through AUX channel, PWM pin and BLUP/BLDN pin Support Dynamic Backlight Control

  • Support OSD display when BLUP/BLDN pins control Backlight Luminance

  • Hot Plug Detection

  • Loads Boot ROM automatically upon power up

  • Serial BOOT ROM data updated through I2C bus or AUX Channel

  • Programmable power management

  • EMI reduction capability for eDP input and LVDS output. Spread spectrum control is available for transmitting LVDS signal

  • Offered in a 68-pin QFN package


Chrontel’s CH7511B is a low-cost, low-power semiconductor device that translates the Embedded DisplayPort signal to the LVDS (Low-Voltage Differential Signaling). This innovative DisplayPort receiver with an integrated LVDS transmitter is specially designed to target the All-In-One PC and the notebook market segments. Through the CH7511B’s advanced decoding/encoding algorithm, the input eDP high-speed serialized video data can be seamlessly converted to LVDS, a popular display technology for high-speed serial links in mid/large-sized LCD displays. Leveraging the eDP’s unique source/sink “Link Training” routine, the CH7511B is capable of instantly bring up the video display to the LCD when the initialization process is completed between CH7511B and the graphic chip.

The CH7511B is designed to meet the Embedded DisplayPort Specification version 1.2. In the device’s receiver block, which supports two eDP Main Link Lanes input with data rate running at either 1.62Gb/s or 2.7Gb/s, can accept RGB digital formats in either 18-bit 6:6:6 or 24-bit 8:8:8 for LVDS output up to 1920x1200. To comply with GPU’s new power saving scheme such as display frame rate reduction, the CH7511B is equipped with the Dynamic Refresh Rate switching method, which can automatically reduce to the low refresh rate supported by the LVDS panel.

The integrated LVDS transmitter supports the single port and the dual ports LVDS outputs to drive display resolution up to WUXGA (1920x1200). CH7511B supports panel select by GPIO[0:3] pins control or writing the chip registers. To reduce EMI emission, the CH7511B’s LVDS encoder block has incorporated Spread Spectrum control and its spread percentage can be adjusted through the internal registers.

The Backlight On/Off and the PWM are two luminance control functions designed in the CH7511B LVDS power control module. The brightness control commands sent through AUX Channel can be dynamically translated by CH7511B and converted into LCD backlight control signal. The CH7511B will save the last setting of brightness level into the BOOT ROM and restore it upon power up. The CH7511B can dynamically adjust backlight brigntness according to video stream to save power consumption and it supports OSD display in this way.

The CH7511B will immediately convert the eDP signal to LVDS output after eDP Link Training is completed. This feature can be achieved by loading the panel’s EDID and the CH7511B’s configuration settings in the serial BOOT ROM connected to the CH7511B. During system power-up and upon completion of the eDP Link Training through AUX Channel, CH7511B will generate LVDS signal according to the panel power-up timing sequencing stored in the BOOT ROM.




PCB Layout and Design Guide for CH7511B and CH7512B, AN-B014 rev1.7

Commercial and Industrial Grade Products, AN-B037 Rev 1 2




Input Interface eDP/DP

Output Interface LVDS

Audio Interface  No

Other features  No

Package Type QFN68


Part Number Package Type Operating Temperature Range Minimum Order

CH7511B-BF Lead Free - 68-pin QFNCommercial : 0 to 70°C260 per tray

CH7511B-BFI Lead Free - 68-pin QFNIndustrial : -40 to 85°C260 per tray




Founded in 1986, Chrontel develops and markets mixed-signal integrated circuits. The company is a leading provider of display interface IC's for personal computers, portable media players & smartphones. Interfacing to different computing platform standards including TV, HDTV, LCD, ...




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TEL: (408) 383-9328

FAX: (408) 383-9338

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