ade3700 STMicroelectronics, ade3700 Datasheet - Page 6

• Manufacturer Part Number: ade3700
• Description: Analog Lcd Display Engine For Xga And Sxga Resolutions
• Manufacturer: STMicroelectronics

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Sync / Timing
Measurement
Mode Set
Autotune
Digital Contrast /
Brightness
White Point
Control
GAMMA
Adjustment
sRGB Control
Pattern
Generation
Flicker Reduction
Backlight Control
Low Power State
Feature
Once an input source is selected, all available information on frequencies and
line/pixel counts is measured for the selected source and made available to
the MCU.
Once the MCU has determined the matching video mode or calculated a
video mode using a GTF algorithm, the datapath is programmed to drive the
flat panel. Clock frequencies for the internal memory and datapath are also
set at this time.
When the MCU calls for an autotune, the MCU sets up an iterative loop to
search for the best phase, gain, offset, etc. At each step of the loop, the MCU
kicks off a test in which the ADE3700 which performs extensive statistical
analysis of the incoming data stream. The results of the analysis are made
available to the MCU which is responsible for the optimization algorithm.
In response to user OSD control, the MCU can program single 8-bit registers
that set brightness and contrast for each color channel independently.
In response to user OSD control, the MCU can program three 8-bit registers
that set the white point for the output.
The MCU can program the gamma RAMs to implement 10-bit accurate color
transformations.
The SRGB block allows simple, intuitive color control with just a few registers.
For production testing, the ADE3700 can be programmed by the MCU to
output a wide set of test patterns.
For Smart Panel applications, the MCU can set up the flicker detection block
to report any correlation with the polarity inversion signal. The MCU can then
change the polarity inversion to a non-correlating pattern to eliminate flicker.
The ADE3700 provides two PWM outputs for direct control of the power
components in a typical backlight. The MCU sets up the registers and enables
the function.
To enter a low power state, the MCU can gate of most of the clocks and put
the analog blocks into a low power standby state.
Description of ADE3700 Operation
Table 1: ADE3700 Features (Sheet 2 of 2)
Blocks Used
SMEAS
GLBL
LLK
SRT
DMUX
SMUX
SCALER
DMEAS
LLK
ADC
SMUX
SRT
SRGB
SRGB
GAMMA
PGEN
FLICKER
TCON
PWM
GLBL
SRGB
ADE3700
25
11
18
23
37
32
42
47
18
17
32
23
60
60
70
54
68
48
80
11
Pages
60