Ltouch Single Board PC

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Contents

Introduction

The Ltouch is an HMI that has a 7" capacitive touch screen. It supports Android 2.3, Android 4.0 as well as Linux (QT). The performance of the new ARM Cortex A8 MCU at 1Ghz allows to use it in many situations where precision, reliability and efficiency are needed.

The board can be easily used in many fields, from industrial to home automation, from prototyping ideas to concrete projects.

A 3D Animation of the new Ltouch XBee touch panel that will be available soon.
Take a look at the video on the right. It features a Ltouch F panel that interacts through RS485 and modbus protocol. Modbus TCP is supported as well.

Versions available

Four versions are available:

  • Ltouch F: shipped with an aluminum frontal frame 5mm thick (IP54 Water and Dust Proof) that can be installed in a panel. Indeed, it has a rearward steel protection cover.
  • Ltouch FW: Frontal IP54 and rear cover. Wifi interface

Technical Specifications

  • MCU
    • Samsung ARM Cortex A8, 1Ghz
    • 45nm architecture
    • 512MB DDR2 (supports up to 1GB)
    • 0.65mm pitch, 17x17mm2 FBGA package
    • 32KB data and instruction caches, 512KB L2 cache
    • 64-bit multi buses
    • powerful built-in PowerVr Sgx 3D graphics engine
    • supports MPEG4, H.263, H.264 1080P@30fps encode/decode and MPEG4 1080P@30fps decode
    • up to 80 Mpixels/s Jpeg decoding
    • HDMI
    • supports LCD/Camera with MIPI interface
  • Memory
    • 512 DDR2 on board
    • 2x SD
  • Flash
    • 4GB onboard iNand
  • Connections
    • Ethernet
    • 4x USB Host 2.0, support multiple level espansion
    • USB OTG
    • 4x PWM
    • 4x UART, support flow control
    • 2x SPI
    • 10x ADC
    • 3x I2C
  • Video
    • LCD interface: support different size LCDs on TTL/LVDS
    • Touch screen interface: support 4/5 lines resistive/capacitive touch sensing
    • 2x Camera interface
    • HDMI interface
  • Audio
    • MIC/Out AC97
  • Power supply
    • VDC +9V @ 1.5A (optional 12 to 24 VDC)
    • Operating temperature -10~70°C
    • Storage temperature -10~80°C
  • Ingress Protection Code
    • IP54 or IP40

Driver support

Item Android 4.0 Android 2.3 Linux + QT
iNand Flash OK OK OK
SD card OK OK OK
Sleep/wake OK OK --
HDMI OK OK OK
7" LDC OK OK OK
Capacitive touch OK OK --
Audio OK OK OK
CMOS Camera OK OK --
USB Host OK OK OK
USB Device OK OK OK
USB Mouse/Key OK OK --
USB Wifi Ltouch FW/SW Ltouch FW/SW --
Ethernet OK OK OK
Serial Bluetooth OK -- --
USB Bluetooth -- OK --
User key OK OK --
UART OK OK OK
G-Sensor OK OK --

API Guide

Skeleton of an hypothetical application that deals with Modbus RTU requests.

This panel is also designed to deal with modbus requests through RS485 under Android. To do so, you simply load our modbus native library in your Android project and call the functions available.

Even though you can design your Android application in many different way, we suggest to follow a skeleton of an hypothetical application that deals with modbus requests. This could be very useful if you need performance and order in the way commands are executed. This example make use of the power of Java threads.

The architecture of this Android app is described in our modbus library section. You will also find a FAQ section where we answered the most frequent questions our customers ask.

If you are interested in using the modbus TCP in our home or industrial application, take a look on how to use it with our Ltouch tablets. See how the modbus TCP communication works.

RS485 Pinout

The following table contains the DB9 pinout for RS485:

RS485 pinout
Pin Description
2 485 Bus (A)
3 485 Bus (B)
5 GND

The figure on the right contains the pin numbering.

Pictures

Ltouch corn.jpg

Technical Drawings

FAQ

Please take a look at Ltouch Android Multi Touch Panel FAQ for customers' frequent asked questions concerning:

Tutorials

External Links

Android-based Multi Touch Panels:

  • Ltouch F with 7" capacitive touch
  • Ltouch FW with 7" capacitive touch and Wifi Interface
Personal tools
Namespaces

Variants
Actions
Structure
Store