ADE3800XT View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

ADE3800XT

Analog LCD Display Engine for XGA and SXGA Resolutions with Embedded LVDS and RSDS Transmitters

STMicroelectronics 

ADE3800

2 General Description

General Description

The ADE3800 family of devices is capable of implementing all of the advanced features of todays

LCD monitor products. For maximum flexibility, an external microcontroller (MCU) is used for

controlling the ADE3800 and other monitor functions.

Figure 1: ADE3800 Block Diagram

Analog

H&V

Syncs

Analog

R, G, B

Data

MCU (SCL, SDA)

I²C

GLBL

Global

Control

PWM

Pulse Width

Modulation

XCLK

Domain

SMEAS

Sync

Measure

SRT

Sync

Retiming

LLK

Line Lock

PLL

SMUX

Sync

Multiplexer

ADC

(Digital)

ADC

(Analog)

INCLK

Domain

DMEAS

Data

Measure

SCLK

Domain

SCL

Scaler

SCLK

PLL

ADE3800

DCLK

Domain

FLK

Flicker

Detection

DCLK

PLL, FM

TCON

Timing

Controller

Out Data

Syncs, &

Clock

TCON

The ADE3800 architecture unburdens the MCU from all data-intensive pixel manipulations,

providing an optimal blend of features and code customizing without incurring the cost of a 16-bit

processor or memory. The key interactions between the monitor MCU and the ADE3800 can be

broken down into the features shown in Table 1.

Table 1: ADE3800 Features (Sheet 1 of 2)

Feature

Description of ADE3800 Operation

Blocks Used Pages

Power-up / Initialize When power is first applied, the ADE3800 is asynchronously reset from a pin. GLBL

18

The MCU typically programs the ADE3800 with a number of default values and SMEAS

36

sets up the ADE3800 to identify activity on any of the input pins. All pre-

LLK

30

configured values and RAMs, such as line-lock PLL settings, OSD characters, ADC

21

LCD timing values (output sequencer), scale kernels, gamma curves, sRGB OSD

72

color warp, APC dithering, output pin configuration (OMUX), etc. can be pre- SCALER

53

loaded into the ADE3800. The typical end state is that the ADE3800 is

GAMMA

71

initialized into a low power mode, ready to turn active once the power button is SRGB

68

pressed.

TCON

102

APC

92

OMUX

94

Activity Detect

When the monitor has been powered on, the inputs can be monitored for active SMEAS

36

video sources. Based on the activity monitors, the MCU chooses an input or

power down state.

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