Datasheet > VMODTFT_RM

VMODTFT_RM

更新时间： 2024-09-16 12:17:07

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VmodTFTâ¢ Reference Manuall

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VMODTFT_RM 数据手册

VmodTFT™ Reference Manual

Revision: November 11, 2011

1300 NE Henley Court, Suite 3

Pullman, WA 99163

(509) 334 6306 Voice | (509) 334 6300 Fax

Note: This document applies to REV C of the board.

Overview

The VmodTFT board lets you connect an LCD

touchscreen to any Digilent FPGA system

board with a VHDCI connector. It acts as both

an input and output device.

It features a 4.3” wide-format vivid color LED-

backlit LCD screen. The screen has a 480×272

native resolution display with a color depth of

24 bits per pixel.

A four-wire resistive touchscreen with anti-

glare coating covers the entire active display

area.

The LED backlight is driven by the on-board

current source. You can change its intensity

digitally using a PWM (Pulse Width

Modulation) signal or you can set jumper JP1

to analog for the default backlight setting.

Features include:

•

a 4.3” color TFT LCD with a resistive

touchscreen

480×272 resolution

The LCD screen and the touchscreen can be

used independently. Touch readings are

noisier when the LCD is on, but you can filter

the noise and still obtain a fast sample rate. If

you require maximum precision and sample

rates, you should turn the LCD off during

touchscreen sampling.

•

24 bpp color depth

80Hz maximum refresh rate

an LED backlight with PWM control

a four-wire resistive touchscreen with

an Analog Devices AD7873 touch

controller

Power-Up Sequence

•

125 kSPS maximum touch sample rate

an on-board temperature sensor that

can detect −40°C to 85°C

a VHDCI connector

The LCD has a specific power-up sequence

that needs to be followed for proper operation.

•

The VmodTFT should only be attached to the

system board once the signals driven by the

system board are defined.

Functional Description

The two-plate four-wire touchscreen uses four

analog lines connecting the opposite sides of

the X and Y plates. A touch controller gives

the touchscreen an FPGA interface. The

controller can both drive and sample the

touchscreen using a digital serial interface.

The LCD is driven using a digital parallel

interface.

The VmodTFT can only be used with FPGA

system boards that support 3.3V supply for the

VHDCI connector. For more information, refer

to your system board’s reference manual at

www.digilentinc.com.

Doc: 502-210

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