Atmel AVR1909 Installationshandbuch

AVR1909: Display Xplained Hardware User's

Guide

Features

• 240 x 320 (QVGA) graphical TFT display

- With resistive touch

- LED Backlight

- Internal controller

• Simple SPI interface for control

• Digital (PWM) control interface for backlight

• One 40pin, 0.5mm FPC connector

• Display and backlight powered by single 3.3V

1 Introduction

The Display Xplained module gives the possibility to evaluate a 240 x 320 pixel

(QVGA) graphical RGB TFT display with a 4-wire touch interface and LED

backlight. The display is interfaced with a simple SPI interface to send and receive

commands and data. The Xplain kit provides tested low–level drivers and high-

level functions in order to get the developer quickly up to speed with his application

development.

Figure 1-1. Display Xplained evaluation module.

8-bit

Microcontrollers

Application Note

Rev. 8297A-AVR-04/10

2 AVR1909 8297A-AVR-04/10

2 Related Items

Datasheet for the LCD module (ET024006DHU) from EDT can be found here:

http://www.farnell.com/datasheets/86386.pdf

Datasheet for the graphical controller (HX8347-A) from Himax can be obtained by

contacting EDT. It may also found on the web.

Firmware for Xplain kit can be found here:

http://www.atmel.com/Xplain

Also checkout these application note:

•AVR1913: Display Xplained Firmware – Getting Started training

•AVR1921: Reprogramming the Xplain AT90USB1287 and ATxmega128A1

•AVR1922: Xplain Board Controller Firmware

3 General information

The LCD module (ET024006DHU from EDT) has a 240 x 320 pixel resolution, with up

to 6 bit pr color, giving 256k colors. The Display Xplained board uses a regular 4-wire

SPI interface to access the display. The touch interface is a 4-wire resistive touch that

should be interfaced to ADC/IO pins to work. The backlight system has three white

LEDs in parallel that can draw up to 60mA at 3.3V. For further details see the

datasheet from EDT.

Figure 3-1. Overview of the Xplain kit backside.

AVR1909

8297A-AVR-04/10

The Display Xplained module is quite simple. It basically connects the TFT display

SPI interface, resistive touch interface, and backlight interface from a 40pin FPC

connector to two female pin-headers that fit the Xplain kit.

In addition it has a program/debug interface that will connect an external

programmer/debugger to the Xplain kit through a male and a female pin-header.

3.1 The LCD Module

The LCD module is produced by EDT (Emerging Display Technologies Corp), and is

called ET024006DHU. It will be replaced with a new version called ET024008DHU in

mid 2010 that have the same outline dimension and same electronics and optical

specification.

The LCD module embeds a graphical controller/driver from Himax called HX8347-A.

This controller provides several communication interfaces like 8/16bit parallel MCU

interface, 16/18bit RGB, and 4-wire serial SPI interface. On the Display Xplained

module this has been hardwired to use serial SPI interface.

The display is attached to the PCB with a strong dual-sided foam tape adhesive that

make it easy to mount. This will electrically insulate the display from the PCB avoiding

any short-circuit problems that may be caused by vibration wearing on the solder

mask and tracks/vias. It will also provide some vibration damping for the display to

protect the glass surface from cracking. It is also quite easy to remove the display if

needed.

3.2 The Touch module

The LCD module has a 4-wire resistive touch interface. This consists of four lines (2

in each X and Y direction) that should be connected to ADC/IO pins on the MCU

interfacing it. The general procedure is to apply a voltage (VCC) for instance on the

X-lines and then measure the voltage on the Y-lines. Then the operation is repeated,

but switching the X and Y lines. This will give a (X,Y) coordinate for the touch.

In order to avoid over driving (saturate) the ADC inputs, serial resistors have been

added so the maximum voltage is within the ADC capability. This is a very simple and

low-cost solution to adjust the touch sensor output to fit the ADC inputs. It will also

lower the current consumption a little to increase the overall power performance.

For more details on how to use 4-wire resistive touch sensors, see the application

note AVR341: Four and five-wire Touch screen Controller using tinyAVR®and

megaAVR®devices

3.3 The Backlight module

The backlight module of the display consists of three white LEDs connected in

parallel. These can draw up to 60mA and have a maximum voltage drop up to 3.6V.

On the Display Xplained module the backlight is connected to the V3P3 (3.3V) power-

supply. This will somewhat limit the maximum light output in change of a simpler

design.

A MOSFET turns the backlight LEDs on/off and a 4.7ohm resistor limits the maximum

current through the LEDs. This makes it quite easy to control the backlight with a

PWM signal to adjust intensity.

4 AVR1909 8297A-AVR-04/10

3.4 The SPI interface

The Display Xplained module uses a simple SPI interface to communicate with the

LCD module. This consist of a Chip-Select (CS) line, a clock line (SCL), and two data

lines (SDI/SDO). The SPI is operated in mode 3, i.e. inactive clock is ‘high’, and data

is latched on rising clock edge.

3.5 The SPI/USART MUX resistors

The ATxmega128A1 has swapped the MOSI and SCK signals between using the

regular SPI and using the USART in master SPI mode, which is available on the

same pins. In order to offer the possibility to use both interfaces, a simple 0-ohm

resistor mux is added to the Display Xplained module. It is currently set up to use the

USART in master SPI mode. To switch to the regular SPI mode, move the two

resistors mounted in position R111/R114 to position R112/R113.

See schematic diagram and PCB assembly drawing for details on where to find these

resistors. Note that they are placed under the LCD flexprint cable, so this needs to be

disconnected from the FPC connector to get access to the resistors Please refer to

Figure 2-1 page 2.

3.6 The LCD Tear-Enable signal (TE)

The LCD Module has an output signal that indicates when the display can be updated

without getting any tearing effects. This signal basically indicates the scan retrace

period of the display, meaning the time-period after the last pixel update and before

the first pixel is written again. This period can be used to update the graphical RAM,

and the update will be shown in the next scan period. For further details, see the

Himax HX8347-A datasheet and application notes.

3.7 The LCD Reset signal

This signal is an input to the LCD module and is used to reset it. It has a pull-up

resistor connected to avoid unintended resets. For further details, see the Himax

HX8347-A datasheet and application notes.

4 Connectors

The Display Xplained module has five 10-pin 100mil headers. Two are used for

programming/debugging interface to the Xplain kit. One is used for SPI interface and

the backlight control of the LCD module. One is used for the touch interface to the

LCD module. The last one is only used as a mechanical stabilizer to the Xplain kit.

Note that the female SMD mounted pin-headers might get damaged if not handled

carefully. The plastic insulation might come off and exposes the conductors.

The last connector on the Display Xplained module is the FPC connector for the LCD

module.

4.1 Programming headers (J103/J104)

The AVR XMEGA™ can be programmed and debugged by connecting an external

programming/debugging tool to the “JTAG & PDI XMEGA” pin header (J100). The pin

header is having a standard JTAG programmer pinout (refer to online help in AVR

Studio®), and tools like the JTAGICE mkII or the AVR ONE! can thus be connected

AVR1909

8297A-AVR-04/10

directly to the header. If it is desired to use PDI programming/debugging an adapter

or squid cable (included in the JTAGICE mkII kit) must be used. Please see Table 4-1

below for pin-out description.

Table 4-1. Programming headers (J103/J104) – JTAG and PDI.

J103/J104 pin JTAG(1) PDI(2)

J103/J104-1 TCK -

J103/J104-2 GND GND(3)

J103/J104-3 TDO -

J103/J104-4 V3P3 V3P3(3)

J103/J104-5 TMS -

J103/J104-6 nSRST PDI_CLK

J103/J104-7 V3P3 V3P3(3)

J103/J104-8 - PDI_DATA

J103/J104-9 TDI -

J103/J104-10 GND GND(3)

Notes: 1. Standard pin-out for JTAGICE mkII and other Atmel programming tools.

2. Requires adapter or squid cable to connect a JTAGICE mkII (refer to AVR

Studio help).

3. It is only required to connect one V3P3/GND pin.

The AT90USB1287 can be programmed by connecting a programming tool, such as

a JTAGICE mkII, to the “JTAG USB” pin header (J200) on the Xplain board. Please

refer to AVR1907: Xplain Hardware User’s Guide for details.

4.2 The resistive touch pin-header (J101)

This connector connects the resistive touch interface to AVR XMEGA’s analog

PORTA that is available on the “XMEGA PORT A” pin header on the Xplain board

(J101). This allows the user to connect external signals to the ADC, DAC and Analog

Comparators on PORTA. Please see Table 4-2 below for pin-out description

Table 4-2. The resistive touch pin-header (J101) connections.

J101 pin LCD resistive touch signals

J101-1 -

J101-2 -

J101-3 -

J101-4 -

J101-5 TFT_XL (X-direction, Left side)

J101-6 TFT_XR (X-direction, Right side)

J101-7 TFT_YD (Y-direction, Bottom [lower] side

J101-8 TFT_YU (Y-direction, Upper side)

J101-9 GND

J101-10 -

6 AVR1909 8297A-AVR-04/10

4.3 The SPI/TE/Reset/backlight pin-header (J102)

This connector connects to the display’s SPI interface and backlight to the AVR

XMEGA’s digital PORTD that is available on the “AVR XMEGA PORT D” pin header

on the Xplain board(J102). Please see Table 4-3 page below for pin-out description.

Table 4-3. The SPI/TE/Reset/backlight pin-header (J102)

J102 pin LCD SPI interface signals + backlight

J102-1 TFT_BL_PWM

J102-2 TFT_RESET

J102-3 TFT_TE (Tear-Enable signal to synchronize write)

J102-4 -

J102-5 TFT_CS

J102-6 TFT_SCL_X (Can be swapped with J102-8)

J102-7 TFT_SDO

J102-8 TFT_SDI_X (Can be swapped with J102-6)

J102-9 GND

J102-10 V3P3

4.4 The unused pin-header (J105)

This connector is not used for electrical connection on the Display Xplained module. It

is only used as mechanical stabilizing to the Xplain kit.

4.5 The LCD connector (J100)

The LCD connector is a 40-pin FPC connector with 0.5mm pitch. For details on

signal/power connections, see the schematic diagram for the Display Xplained

module.

5 Available code examples and drivers

A Getting-Started training for the Display Xplained kit can be downloaded from the

Atmel web site. The application note is called: AVR1913: Display Xplained

Firmware – Getting Started training.

Further information and drivers for Display Xplained can be downloaded as

application notes, also distributed from Atmel’s web site.

6 Mounting Display Xplained module to Xplain kit

The Display Xplained module will fit onto the expansion connectors on the Xplain kit.

Be careful to rotate the Display Xplained module correctly to the Xplain kit. The text

direction should be the same on both when rotated correctly. Also be careful to align

the connectors to avoid wrong signal/power connections that might cause damage to

the boards.

Also be careful when the Display Xplained module is removed to avoid bending pins.

Don’t use any hard tools that might cause damage to the boards. Pay attention to

EMC guidelines and proper handling precautions to avoid ESD damage to the

boards.

8297A-AVR-04/10

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