FEATURES GENERAL DESCRIPTION

? 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.