90-00035-A0

Features • Complete Touchscreen Module: – Projected Capacitive Multi Touch Controller – 3.5in LCD – 200 bytes non-volatile serial EEPROM • Touch: – Atmel maXTouch™ mXT112S Touch Controller – Supports up to 4 touches • Display: – 320x480 resolution – ILI9488 driver IC – 30 ms max response time – White LED backlight – 8-bit MCU parallel interface • Cover Panel: – 1.1mm Soda Lime Glass TM3500 PDA TM3500: 3.5in PCAP Touch Module Visit http://www.pdaatl.com/tm3500 for the latest information on the TM3500 1410-3-4   Contents 1 2 Module Overview 1.1 PCB Connections 4 1.2 Display Flex Connector J1 5 1.3 Host Interface J2 6 1.4 Touch Sensor Flex Connector J3 7 1.5 Debug Connector J4 7 Overview of the 3.5in PCAP Touch Module Introduction 8 2.2 Background Concepts 9 2.3 Module Logic Voltage 9 2.4 LCD Panel 9 2.5 maXTouch Capacitive Touchscreen Controller 2.6 Getting Started  2 10 10 10 11 3.1 Hardware Connections 11 3.2 Software 11 3.3 Using the Touch Module 12 Evaluating the Touch Module Specifications 12 13 4.1 Mechanical Specifications 13 4.2 Module Parameters 14 4.3 Absolute Maximum Specifications 14 4.4 Recommended Operating Conditions 15 4.5 DC Specifications 15 4.6 I2C-compatible Bus Specifications 15 4.7 Power Consumption 15 4.8 LCM Specification 16 4.8.1 LCM Parameters 16 4.8.2 LCM Absolute Maximum Specifications 17 4.8.3 LCM DC Specifications 17 4.8.4 LCM Backlight Specifications 18 4.8.5 LCM Optical Characteristics 18 4.9 5 maXTouch Controller Interface Serial EEPROM 3.3.1 4 8 2.1 2.5.1 3 4 TM3500 Part Number I2C Basics (I2C-compatible Operation) PDA TM3500: 3.5in PCAP Touch Module 19 20 1410-3-4 PDA TM3500: 3.5in PCAP Touch Module 5.1 Interface Bus 20 5.2 Transferring Data Bits 20 5.3 START and STOP Conditions 20 5.4 Address Byte Format 21 5.5 Data Byte Format 21 5.6 Combining Address and Data Bytes into a Transmission 22 6 Revision History 23 7 Notes 24   3 1 Module Overview 1.1 PCB Connections Touch Sensor Flex J3 MXT112 S ATMEL Pin 1 D S24B33 Pin 1 J2 Pin 1 Display J1 Flex Host Figure 1 - PCB Connectors NOTE: Insert flex in Host Connector J2 with contacts facing DOWN. The following notations are used for pin descriptions: I Input only O Output only, push-pull MXT EE maXTouch touchscreen OD Open drain output P Ground or power LCD LCD Panel Serial EEPROM NOTE: Inputs and output are defined from the standpoint of the Touch Module.  4 PDA TM3500: 3.5in PCAP Touch Module 1410-3-4 PDA TM3500: 3.5in PCAP Touch Module 1.2 Display Flex Connector J1 Connector J1 connects to the LCD panel flex and carries signals between the Host and the LCD Panel. Pin Type 1 P 2 3 Description Pin Type Description GND 24 O LCD_DATA_7 P LED/K6 25 O LCD_DATA_6 P LED/K5 26 O LCD_DATA_5 4 P LED/K4 27 O LCD_DATA_4 5 P LED/K3 28 O LCD_DATA_3 6 P LED/K2 29 O LCD_DATA_2 7 P LED/K1 30 O LCD_DATA_1 8 P LED/A 31 O LCD_DATA_0 9 O IM2 32 P Vdd 10 O IM1 33 O VSYNC 11 O IM0 34 O HSYNC 12 P VDD_IO 35 - N/C 13 P GND 36 O RDX 14 O LCD_DATA_17 37 O DE 15 O LCD_DATA_16 38 O ~RESET 16 O LCD_DATA_15 39 O PCLK 17 O LCD_DATA_14 40 O ~SS 18 O LCD_DATA_13 41 O D/CX 19 O LCD_DATA_12 42 O SCK 20 O LCD_DATA_11 43 I MOSI 21 O LCD_DATA_10 44 O MISO 22 O LCD_DATA_9 45 P GND 23 O LCD_DATA_8   5 1.3 Host Interface J2 Connector J2 implements Atmel’s “XPRO LCD” connector found on various Xplained and Xplained Pro evaluation kits. It connects to the host and carries signals between the host and (1) the MaXTouch Touch Controller, (2) the LCD Panel, and (3) serial EEPROM. Suggested Flex (included with the TM3500 kit): Manufacturer P/N: Wurth Electronics #687 650 100 002 Description: 0.5mm pitch 50 position FFC, Length 100mm  6 Pin Type  26 I LCD_DATA_19 / TP5 27 P GND  28 I LCD_DATA_20 / TP3  LCD_DATA_1  29 I LCD_DATA_21 / TP6  I LCD_DATA_2  30 I LCD_DATA_22 / TP4  I LCD_DATA_3  31 I LCD_DATA_23 / TP1  7 P GND 32 P GND 8 I LCD_DATA_4  33 I PCLK (parallel) / D/CX (SPI)  Pin Type Description 1 I/O 2 P GND 3 I LCD_DATA_0 4 I 5 6 One-Wire Interface Description  9 I LCD_DATA_5  34 I VSYNC (parallel) / CS (SPI)  10 I LCD_DATA_6  35 I HSYNC (parallel) / WR (SPI)  11 I LCD_DATA_7  36 I DE (parallel) / RE (SPI)  12 P GND 37 I SCK  13 I LCD_DATA_8  38 I MOSI  14 I LCD_DATA_9  39 O MISO  15 I LCD_DATA_10  40 I ~SS  16 I LCD_DATA_11  41 I DISP  17 P GND 42 I I2C SDA  18 I LCD_DATA_12  43 I/O I2C SCL  19 I LCD_DATA_13  44 O ~MXT_CHG  20 I LCD_DATA_14  45 - N/C 21 I LCD_DATA_15  46 I LCD_PWM 22 P GND 47 I ~RESET 23 I LCD_DATA_16  48 P +3.3Vdc 24 I LCD_DATA_17  49 P +3.3Vdc 25 I LCD_DATA_18 / TP2  50 P GND PDA TM3500: 3.5in PCAP Touch Module EE LCD MXT EE LCD MXT Flex should be inserted in to Connector J2 with contacts facing DOWN towards the PCB.   1410-3-4 PDA TM3500: 3.5in PCAP Touch Module 1.4 Touch Sensor Flex Connector J3 Connector J3 connects to the touch sensor flex and carries signals used by the maXTouch controller to detect input on the touch sensor. Pin Type 1 P 2 3 Description Pin Type Description GND 14 I/O X1 I/O X13 15 I/O X0 I/O X12 16 P GND 4 I/O X11 17 P GND 5 I/O X10 18 I/O Y0 6 I/O X9 19 I/O Y1 7 I/O X8 20 I/O Y2 8 I/O X7 21 I/O Y3 9 I/O X6 22 I/O Y4 10 I/O X5 23 I/O Y5 11 I/O X4 24 I/O Y6 12 I/O X3 25 I/O Y7 13 I/O X2 26 P GND 1.5 Debug Connector J4 Type Description Pin Type Description 2 MXT Pin MXT Connector J4 carries signals used to debug the maXTouch Touch Controller.  1 - N/C 6 I/O 2 - N/C 7 P 3.3V 3 O ~MXT_CHG 8 P GND 4 - N/C 9 O DBG DATA  10 O DBG CLK  5 I 2 I C SDA   I C SCL   7 2 Overview of the 3.5in PCAP Touch Module 2.1 Introduction The TM3500 3.5in PCAP Touch Module is a touchscreen module offering best-in-class projected capacitance multi-touch functionality combined with a 3.5in LCD panel. The module is configured for development and evaluation with several Atmel AVR- and ARM-based evaluation solutions as well as development and integration with a custom host system. For convenience, this module features a host interface connector for use with hardware supporting the Xplained PRO LCD interface As shown in Figure 2 below, the module provides host access to several sub-system components to maximize effective integration. TM3500 - Touch Module PCB J2 J3 mXT112S Capacitive Touchscreen Controller J1 LCD Panel Serial EEPROM Touch sensor DS24B33 HOST Figure 2 - Functional Block Diagram  8 PDA TM3500: 3.5in PCAP Touch Module 1410-3-4 PDA TM3500: 3.5in PCAP Touch Module 2.2 Background Concepts Throughout this document, the functionality of the module sub-system will be outlined and summarized. However, the user is encouraged to refer to the resources and documents below in order to gain a more thorough understanding of each sub-system. • Atmel maXTouch mXT112S Datasheet (www.atmel.com) • For a basic overview of I2C communication, refer to Section 5 of this document • ILI Technology Corp ILI9488 Driver IC (www.ilitek.com) • Maxim DS24B33 Datasheet (www.maximintegrated.com) In addition, when developing or evaluating with the Atmel Xplained and Xplained PRO evaluation kits, it is recommended that the user visit asf.atmel.com and www.at91.com which contains a broad range of resources for the EK’s and the devices they feature. Visit www.pdaatl.com/tm3500 for the latest information on this module. 2.3 Module Logic Voltage The module logic voltage is derived from the input supply voltage provided by the host (Connector J2). This voltage is selectable by optionally populating R29 shown in Figure 3 below. J2 Figure 3 - Voltage Selection The logic voltages can be selected according to Table 2-1 below. Table 2-1 - Logic Voltage Selection R29 0Ω DNP Direction 3.3V 2.8V Note: Factory setting is 2.8V The interface bus voltage may be adjusted lower (down to 1.8Vdc) if desired. For more information contact PDA. 2.4 LCD Panel The module provides the host with a direct connection from the host (Connector J2) to the LCD panel interface (Connector J1). Aside from generating supply voltages for the LED backlight and providing backlight control to the host, no display panel control is performed by the module.   9 The LCD panel features an ILI 9488 internal driver IC. For further details on interfacing to the ILI9488 contact Precision Design Associates (www.pdaatl.com) or ILITEK (www.ilitek.com). Also, refer to Section 3.2 below for additional resources. 2.5 maXTouch Capacitive Touchscreen Controller The module touch screen interface is based on the Atmel maXTouch mXT112S Touch Controller and operates on the touch sensor at Connector J3. The touch controller scans the touch sensor and will signal the host with an active low interrupt signal (~MXT_CHG on J2) when new touch data is available. Data communication with the maXTouch controller is performed over the I2C interface (on J2). The I2C address of the touch controller is fixed at 0x4A is not configurable. NOTE: The TM3500 has pull-up resistors on the I2C SCL (R32) and SDA (R31) lines. A pull-up resistor for the maXTouch ~CHG interrupt signal is located at R33. 2.5.1 maXTouch Controller Interface Details of the maXTouch communication protocol are beyond the scope of this document. provided below to facilitate evaluation and initial development. However information is This module is pre-loaded with a configuration already optimized for this touch sensor and panel, so the developer need only focus on interfacing with the device. When developing the maXTouch controller interface during evaluation and host development, care should be taken to avoid changing the maXTouch configuration or committing changes to NV storage on the maXTouch controller. To get started with host interface development, the user is strongly encouraged to leverage existing code available from the resources outlined in Sections 3.2 2.6 Serial EEPROM The module includes a DS24B33 Serial EEPROM providing 512 bytes of non-volatile storage. Data communication with the EEPROM is performed over a One-Wire Interface. The EEPROM is not used by another subsystem on the touch module and can be freely used by the host system for any purpose. For example, Atmel ARM-based EK’s running Linux or Android operating systems use the pre-programmed contents of the EEPROM to identify this module type. NOTE: The user should take care if choosing to overwrite the pre-programmed EEPROM contents. As noted above, certain builds of Linux or Android targeted for the Atmel ARM-based EKs use the EEPROM contents to identify the module and may no longer recognize the module. The user is advised to backup the EEPROM contents before overwriting. The serial EEPROM is accessed via a one-wire interface (ONE_WIRE Interface on J2). Refer to the DS24B33 Datasheet (www.maximintegrated.com) for details.  10 PDA TM3500: 3.5in PCAP Touch Module 1410-3-4 PDA TM3500: 3.5in PCAP Touch Module 3 Getting Started This module was designed for use with a variety of Atmel ARM-based EK’s including the SAM4S Xplained Pro and SAMA5D3 Xplained evaluation kits. This provides the fastest way to evaluate the performance of the touchscreen and display. The following sections provide basic information related to using and evaluating the Touch Module. Visit the Precision Design Associates website (www.pdaatl.com/tm3500) or Atmel’s AT91 Community website (www.at91.com) for more information related to this touch module or guidance appropriate for your specific EK. 3.1 Hardware Connections MXT112 S ATMEL The module interfaces with the EK board via the Host Interface at flex connector, J2. The Flat Flex Cable should be inserted with flex contacts facing DOWN toward the PCB as shown in Figure 4 below. This interface can be used connected to Atmel evaluation kits that support the “XPRO LCD” connector. Refer to EK documentation to see if this interface is supported by the evaluation hardware and ensure proper matchup of host signals. Pin 1 D S24B33 J2 FFC Contacts face DOWN Figure 4 - Host Flex Connection 3.2 Software Several options exist when developing for the touch module whether targeting a custom host or an Atmel EK. Support for the TM3500 is currently being built into upcoming releases of various Atmel resources. Check the Precision Design Associates website (www.pdaatl.com/tm3500) for updates and links to demo binaries for use with the TM3500. 3.2.1.1 Atmel Studio and Atmel Software Framework Atmel Studio (www.atmel.com/atmelstudio) is Atmel’s free IDE and tool chain. It includes support for a variety of Atmel’s MCUs devices and provides a means to start developing basic, “bare-metal” software for .the TM3500. The Atmel Software Framework (asf.atmel.com) contains examples of code for interfacing with devices in the maXTouch family of touch controllers. The capabilities of various maXTouch devices may differ, but the basic communication protocol is common and can be applied to this module. 3.2.1.2 Linux Kernel / Android The Linux Kernel (www.kernel.org) has included basic support for maXTouch touch devices since version 2.6.36. The mainline driver has undergone considerable evolution since then. Atmel hosts the AT91 community website with resources dedicated to developing their EKs for Android (www.at91.com/android4sam) and Linux (www.at91.com/linux4sam) In addition, Atmel maintains patches (www.github.com/atmel-maxtouch/linux) which provide numerous out-of-cycle improvements to the mainline Linux Kernel driver for maXTouch devices.   11 3.3 Using the Touch Module 3.3.1 Evaluating the Touch Module For effective evaluation of the module’s touch sensor and LCD panel, the user is encouraged to try the following applications and tools depending on the desired host OS. 3.3.1.1 Android Atmel provides prebuilt Android system images for use with some of their ARM evaluation kits which can be used to demonstrate the touch module. Visit the Android4SAM website (www.at91.com/android4sam) for more details. Follow the guides on the AT91 Community website or the PDA website for info on how to load the system image onto your evaluation kit hardware. In addition, the following Android apps are available from Google Play: TouchTest by Moonblink Dotty by Gerry Steele Multitouch Visible Test by Battery Powered Games Screen Test by Amberfog 3.3.1.2 Linux Atmel provides prebuilt Linux system images for use with some of their ARM evaluation kits which can be used to demonstrate the touch module. Visit the Linux4SAM website (www.at91.com/linux4sam) for more details. Some system images include demo UI applications from Qt Timesys and Crank Software. The user can perform simple touch / drawing test using the ts_test utility that is part of tslib. Follow the guides on the AT91 Community website or the PDA website for info on how to load the system image onto your evaluation kit hardware. 3.3.1.3 “Bare Metal” Check the Precision Design Associates website (www.pdaatl.com/tm3500) for links to demo binaries for use with the TM3500.  12 PDA TM3500: 3.5in PCAP Touch Module 1410-3-4 PDA TM3500: 3.5in PCAP Touch Module 4 Specifications Except where noted, the following specifications apply to the whole TM3500 assembly. For complete specifications, refer to the datasheets listed in section 2.2 for the various sub-system components outlined in Sections 2.4 through 2.6 or contact PDA. 4.1 Mechanical Specifications 3.51 mm Drawings and CAD models available upon request. 85.51±0.15mm (Sensor Substrate Outline) Cover Glass Profile 94.44mm x 69.96mm R6mm in corners X13,Y0 15.51±0.5 mm (FPC to Cover Panel Edge) X0,Y0 57.59±0.15mm (Sensor Substrate Outline) 73.44 mm (LCD Active) PIN 1 X0,Y7 Viewed from user side 13.5 mm (FPC Min Width) 48.96 mm (LCD Active) X13,Y7 42.45±0.5 mm (FPC to Cover Panel Edge) 26.7 mm (FPC Max Width) NOTE: PCB Contacts face DOWN as drawn User side 1.1 mm (Cover Panel) Back side 1.5 mm (Sensor - Cover Panel) Figure 5 - Sensor Only Dimensions Sensor (P/N: 90-00023-A1) may be purchased individually. Minimum order quantities apply. Contact PDA for details.   13 54.2mm (LCM Outline) Cover Glass Profile 94.44mm x 69.96mm R6mm in corners 2.1 mm (PCB Component Clearance) MXT112S 39.9±0.5 mm D S24B 33 ATMEL 84.2mm (LCM Outline) 7.8 mm 7.9 mm view direction 8.7 mm (Module) Back (LCD) side User side Figure 6 – Module Dimensions 4.2 Module Parameters Parameter Value Module Size 3.5in Overall Dimensions 69.96mm (H) x 94.44mm (W) x 8.7mm (T) Overall Weight 48.8g 4.3 Absolute Maximum Specifications Parameter Value Operating temp 0oC to + 70oC Storage temp -30 C to + 80 C Vdd -0.5 to +6V Max continuous pin current, any control or drive pin ±40 mA Voltage forced onto any pin -0.5V to (Vdd + 0.5) Volts o o CAUTION: Stresses beyond those listed under Absolute Maximum Specifications may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or other conditions beyond those indicated in the operational sections of this specification are not implied. Exposure to absolute maximum specification conditions for extended periods may affect device reliability.  14 PDA TM3500: 3.5in PCAP Touch Module 1410-3-4 PDA TM3500: 3.5in PCAP Touch Module 4.4 Recommended Operating Conditions Parameter Value Vin 3.3V ±5 percent Supply ripple + noise ±20 mV 4.5 DC Specifications Vin = 3.3V, Vdd=2.8VDC, Ta = recommended range, unless otherwise noted Parameter Description Min Typ Max Units Notes VIL Low input logic level - 0.5 – 0.3 Vdd V 1.8V