Texas Instruments TSC4270 User manual

User's Guide
SBAU208–April 2013
TSC4270 Evaluation Module
Figure 1. TSC4270 Evaluation Module
This user's guide describes the characteristics, operation, and use of the TSC4270 evaluation module
(EVM). The TSC4270EVM is an evaluation fixture for the TSC4270, a touch screen controller (TSC) for
capacitive touch panels. A complete circuit description, schematic diagram, and bill of materials are
included.
The following related documents are available for download through the Texas Instruments web site at
http://www.ti.com.
Table 1. EVM-Related Device Data Sheets
Device Literature Number
TSC4270 Data sheet available on request
LM3S3748 See LM3S3748 for the latest documentation
LM4F120 See LM4F120 for the latest documentation
Windows, Windows XP, Windows 7 are registered trademarks of Microsoft Corporation.
SPI is a trademark of Motorola, Inc.
I2C is a trademark of NXP Semiconductors.
All other trademarks are the property of their respective owners.
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Contents
1 EVM Overview ............................................................................................................... 3
2 Hardware Overview ......................................................................................................... 4
3 Power Supply ................................................................................................................ 7
4 Installation .................................................................................................................... 7
5 Operation ................................................................................................................... 12
6 Bill of Materials ............................................................................................................. 25
7 Schematics ................................................................................................................. 26
List of Figures
1 TSC4270 Evaluation Module.............................................................................................. 1
2 TSC4270 DUT Board, Top View.......................................................................................... 5
3 TSC4270 DUT Board, Bottom View...................................................................................... 6
4 Stellaris Motherboard....................................................................................................... 6
5 Highlighted Application USB Port on the TSC4270EVM .............................................................. 8
6 Inf-Wizard Startup Window ................................................................................................ 8
7 Inf-Wizard Device Selection ............................................................................................... 9
8 Inf-Wizard Device Configuration .......................................................................................... 9
9 Inf-Wizard File Save Prompt............................................................................................. 10
10 Inf-Wizard Installation Prompt ........................................................................................... 10
11 Driver Installer Authentication............................................................................................ 11
12 GUI Startup Screen ....................................................................................................... 12
13 GUI Block Description .................................................................................................... 13
14 Button Menu................................................................................................................ 14
15 Runtime Configuration Grid, Expanded View.......................................................................... 15
16 Tunable Flash Parameters Grid, Expanded View..................................................................... 16
17 Plot Options Available on Touch Report Tab.......................................................................... 17
18 Node Reports from the TSC When a Finger is Present on Panel .................................................. 18
19 Calibration Data............................................................................................................ 19
20 Device Information ........................................................................................................ 20
21 Sense Force Application.................................................................................................. 21
22 Finger Paint Application .................................................................................................. 22
23 Force Values of Fingers .................................................................................................. 23
24 Orientation Plot ............................................................................................................ 24
List of Tables
1 EVM-Related Device Data Sheets........................................................................................ 1
2 Analog Connection Through 36-Pin Connector J1 ..................................................................... 4
3 Pinout for Digital Interface P2 ............................................................................................. 5
4 TSC4270EVM Daughterboard Bill of Materials ....................................................................... 25
5 TSC4270EVM Motherboard Bill of Materials .......................................................................... 25
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1 EVM Overview
1.1 Features
The TSC4270EVM main features include:
• Full-featured evaluation board for the TSC4270 capacitive touch screen controller (TSC)
• Digital interface for use with external processors
• Easy-to-use evaluation software for computers with Microsoft Windows®operating systems
• USB-powered (with optional power supply)
• Complete control of board settings
The TSC4270EVM is a complete evaluation kit. This kit combines the TSC4270EVM daughterboard with
the Stellaris microcontroller-based TSC4270 EVM motherboard and evaluation software for use with a
personal computer (PC).
The TSC4270EVM motherboard allows the TSC4270EVM daughterboard to be connected to the computer
using an available USB port. This manual shows how to use the TSC4270EVM motherboard as part of the
TSC4270 evaluation module kit, but does not provide technical details about the TSC4270EVM
motherboard itself.
This manual covers the operation of the TSC4270EVM. Throughout this document, the terms
TSC4270EVM, evaluation board, evaluation module, and EVM are synonymous with the TSC4270
evaluation module, and the abbreviation of graphical user interface (GUI) is synonymous with the
TSC4270 GUI software.
1.2 Introduction
The TSC4270EVM can assist in the process of system prototyping, and firmware and software
development around the TSC4270 device.
The EVM allows for easy access to the TSC4270 with a user-specified host processor and software in
order to direct evaluation on the TSC4270 performance and operating characteristics. The EVM is a
complete evaluation and demonstration package for use with a personal computer equipped with a
Microsoft Windows XP®or Windows 7®operating system.
The TSC4270EVM-PDK includes the following items:
1. TSC4270EVM daughterboard
2. TSC4270EVM motherboard
3. Capacitive touch screen panel from Truly Semiconductor, installed on supporting fixture (see Figure 1)
4. Evaluation-software and related documentation (downloaded from ftp://ftp.ti.com/pub/evm-
pdk/TSC4270/)
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2 Hardware Overview
2.1 Analog Interface
The TSC4270 supports a 33-wire capacitive touch screen. A 36-pin FPC/FFC connector J1 (part number
FH12-36S-0.5SH) is installed on the TSC4270EVM daughterboard, and provides a direct connection to a
corresponding 36-pin flat cable from the capacitive touch screen.
Table 2 details the pinout of 36-pin connector J1 on a TSC4270EVM daughterboard and also shows the
suggested connection to the provided 20-row by 12-column capacitive touch screen panel.
Table 2. Analog Connection Through 36-Pin Connector J1
Pin Number TSC4270 20 × 12 Screen
J1.1 GND GND
J1.2 Pin 2 R8 Panel row 19
J1.3 Pin 2 R7 Panel row 18
J1.4 Pin 2 R6 Panel row 17
J1.5 Pin 2 R5 Panel row 16
J1.6 Pin 2 R4 Panel row 15
J1.7 Pin 30 R3 Panel row 14
J1.8 Pin 31 R2 Panel row 13
J1.9 Pin 32 R1 Panel row 12
J1.10 Pin 33 R0 Panel row 11
J1.11 GND GND
J1.12 Pin 37 C13 / R2 Panel column 11
J1.13 Pin 38 C12 Panel column 10
J1.14 Pin 39 C11 Panel column 9
J1.15 Pin 40 C10 Panel column 8
J1.16 Pin 41 C9 Panel column 7
J1.17 Pin 42 C8 Panel column 6
J1.18 Pin 43 C7 Panel column 5
J1.19 Pin 44 C6 Panel column 4
J1.20 Pin 45 C5 Panel column 3
J1.21 Pin 46 C4 Panel column 2
J1.22 Pin 47 C3 Panel column 1
J1.23 Pin 48 C2 Panel column 0
J1.24 GND
J1.25 Pin 1 R19 / C1 Panel row 10
J1.26 Pin 2 R18 / C0 Panel row 9
J1.27 Pin 3 R9 Panel row 8
J1.28 Pin 4 R10 Panel row 7
J1.29 Pin 5 R11 Panel row 6
J1.30 Pin 6 R12 Panel row 5
J1.31 Pin 7 R13 Panel row 4
J1.32 Pin 8 R14 Panel row 3
J1.33 Pin 9 R15 Panel row 2
J1.34 Pin 10 R16 Panel row 1
J1.35 Pin 11 R17 Panel row 0
J1.36 GND GND
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TSC4270
36-Pin
Sensor Connector
DUT J2
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2.2 Digital Interface
The TSC4270 EVM is designed to easily interface with multiple control platforms. A convenient 24-pin
socket J2 (Samtec SSM-124-X-SV) is installed on the TSC4270EVM daughterboard, and provides an
interface to digital signals between the TSC4270 device and the Stellaris LM3S3748 microprocessor on
the TSC4270EVM motherboard.
Table 3. Pinout for Digital Interface P2
Pin Name Description
J2.1 DUT SCL I2C™ bus serial clock
J2.2 DUT SDA I2C bus serial data line
J2.3 to J2.6 Unused Unused
J2.7 DUT+1p8V +1.8 V power supply to the TSC4270 device
J2.8 GND Ground
J2.9 DUT+3p3V +3.3 V power supply to the TSC4270 device
J2.10 GND Ground
J2.11 Stellaris+3p3V +3.3 V power supply to the Stellaris device
J2.12 Unused Unused
J2.13 DUT RST TSC4270 reset, active low
J2.14 DUT IRQ TSC4270 interrupt, active low
J2.15 to J2.20 Unused Unused
J2.21 DUT CS SPI™ bus chip selection, active low
J2.22 DUT MISO SPI bus master-in-slave-out data line
J2.23 DUT MOSI SPI bus master-out-slave-in data line
J2.24 DUT SCLK SPI bus sync clock
2.3 DUT and MCO Printed Circuit Boards (PCBs)
Figure 2. TSC4270 DUT Board, Top View
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Figure 3. TSC4270 DUT Board, Bottom View
Figure 4. Stellaris Motherboard
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3 Power Supply
The power supplies to the TSC4270EVM kit are derived from the USB connected to your PC. On the
TSC4270EVM motherboard, the +5.0-V power from the USB is regulated by linear regulators U3, U4, and
U5. These regulators generate +3.3 VDC to provide power supplies to the Stellaris microprocessors and
other circuitry on the TSC4270EVM motherboard, and also generate +3.3 VDC and +1.8 VDC to provide
power-supplies to the TSC4270 on the TSC4270EVM daughterboard.
As shown in Table 3, the +3.3 VDC and +1.8 VDC power supplies are provided to the TSC4270EVM
daughterboard through connector J2.
4 Installation
4.1 Hardware Description
The following items are provided in the hardware packet.
1. One TSC4270EVM daughterboard printed circuit board (PCB).
2. One TSC4270EVM motherboard PCB.
3. One TRULY Semiconductor, 20 × 12 channel capacitive touch screen, assembled on a fixture.
4. One USB connection cable.
5. TSC4270EVM-PDK evaluation software and related documentation (download from
ftp://ftp.ti.com/pub/evm-pdk/TSC4270/).
Items 1, 2, and 3 arrive preassembled, as shown in Figure 1. Installing the EVM software, is described in
the following section.
4.2 Software Installation
The USB driver installation has to be carried out before running the GUI software.
1. 1. Based on the PC specifications, download the latest TSC4270EVM-PDK software package from
ftp://ftp.ti.com/pub/evm-pdk/TSC4270/.
2. Extract the software package to the local hard drive.
3. Prerequisites before installation:
(a) .NET Framework v4.0 or higher (ftp://ftp.ti.com/pub/evm-pdk/TSC4270/).
(b) Visual C++ redistributable 2010 or higher (ftp://ftp.ti.com/pub/evm-pdk/TSC4270/).
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4. Install the USB driver:
(a) Plug the USB mini 5-wire cable from the PC to the application USB port shown in Figure 5.
Figure 5. Highlighted Application USB Port on the TSC4270EVM
(b) Ignore or cancel the Windows automatic driver installation.
(c) Navigate to TSC4270\TSC4270_Depends\libusb-win32-bin-1.2.6.0\bin in the unzipped folder.
(d) Run inf-wizard.exe.
(e) Click Next, as shown in Figure 6
Figure 6. Inf-Wizard Startup Window
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(f) Select the TSC device with Vendor ID = 0x1CBE, and Product ID = 0x0003, and click Next, as
shown in Figure 7
Figure 7. Inf-Wizard Device Selection
(g) Click Next, as shown in Figure 8.
Figure 8. Inf-Wizard Device Configuration
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(h) Select a location on the local hard disk and click Save, as shown in Figure 9.
Figure 9. Inf-Wizard File Save Prompt
(i) Click Install Now.., as shown in Figure 10. After installation, unplug the device, and then plug it
back in.
Figure 10. Inf-Wizard Installation Prompt
(j) If the window shown in Figure 11 appears, click Install this driver software anyway.
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Figure 11. Driver Installer Authentication
(k) Optional verification: navigate to the Windows Control Panel and open the Device Manager. If
installation was successful, libusb-win32 device and TSC device is visible in the tree.
5. Plug in the EVM and run the TSC 4270 EVM Application.exe file from the project folder.
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5 Operation
The following sections of this user guide provide information on operating the TSC4270EVM.
5.1 Quick Start
After both hardware and software installation processes have been successfully completed, connect the
USB cable from the PC to the TSC4270EVM motherboard (J9 on the motherboard).
As configured at the factory, the TSC4270EVM motherboard is powered from the USB interface.
Therefore, an external power supply is not required. Upon USB connection, the green indicator LEDs on
the TSC4270EVM motherboard light up, and the +3.3 V and +1.8 V LEDs on the daughterboard also light
up.
After the TSC4270EVM is powered on, launch the TSC4270 EVM Application.exe file. The software
should automatically find the TSC4270EVM, and the GUI startup screen appears, as shown in Figure 12.
Figure 12. GUI Startup Screen
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A
B
C
D
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5.2 GUI Operation
After plugging the EVM into a USB port and starting the TSC4270EVM-PDK software, the GUI is
displayed, as shown in Figure 12. Use the TSC4270EVM GUI to test different functions of the TSC4270.
There are five main tabs in the GUI:
1. Touch Report
2. Node Report
3. Calibration Report
4. Device Information
5. Applications
These tabs are described later in this document. After a successful enumeration of the hardware EVM by
the GUI, the startup screen is displayed, as shown in Figure 13. The main regions of the GUI map are
shown in Figure 13.
A Button menu.
B Runtime configuration grid.
C Tunable flash parameters grid.
D Tabs for user control.
Figure 13. GUI Block Description
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5.2.1 Button Menu
The button menu is shown in Figure 14.
Figure 14. Button Menu
The individual buttons are described as follows:
(i) Upload run-time parameters from TSC: This button gets the current run-time parameters (that is, filter
enables, report rate, and more from the TSC) and populates it on the runtime configuration grid from
Figure 13.
(ii) Download run-time parameters to TSC: This button flashes the TSC with the values set in the runtime
configuration to the TSC4270.
(iii) Save run-time parameters to disk: This button saves the configuration from the runtime configuration
to an XML file on your hard drive.
(iv) Load run-time parameters from disk: This button loads the configuration from an XML file on your hard
drive to the runtime configuration.
(v) Reset TSC: This button issues a hardware reset to the TSC. Note that any run-time configuration
changes are erased and set to default values.
(vi) Reload GUI: This button cancels any changes made, and reloads the GUI in case an error occurs
during operation. Unplug the EVM before pressing this button.
5.2.2 Options Menu
The options drop-down menu contains the following items:
1. Upload flash parameters from TSC: This menu item retrieves the current tunable flash parameters from
the TSC and populates it in the tunable flash parameters grid, as shown in Figure 13. A window pops
up asking for the Service Key provided by Texas Instruments. The keyboard shortcut is Ctrl+U.
2. Download flash parameters to TSC: This item downloads the current tunable flash parameters from the
tunable flash parameters grid to the TSC. A window pops up asking for the service key provided by
Texas Instruments. The keyboard shortcut is Ctrl+D.
3. Save flash parameters to disk: This item writes all the items from the tunable flash parameters grid to
an xml file for later use.
4. Load flash parameters from disk: This item uploads an xml file to the tunable flash parameters grid.
This file can be altered and flashed to the TSC, if needed.
5. Load flash image: This item flashes the firmware on the TSC after mass erasing the device. To
complete this action, enter the provided service key and ISP key in the subsequent popup window. The
keyboard shortcut is Ctrl+F.
6. Exit: This item shuts down the program. Keyboard shortcut is Ctrl+Q.
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5.2.3 Adjusting the Settings
The TSC4270 behavior can be adjusted by changing the values of the the runtime configuration grid and
the tunable flash parameters grid and writing it to the TSC4270.
5.2.3.1 Runtime Configuration Grid
Use the runtime configuration grid to adjust the TSC4270 dynamic settings that do not require to change
the state of the TSC4270. Permitted operations include changing the report rate and turning the filters on
or off. This operation does not require service or ISP keys. After changing the values, the TSC4270 must
be updated with the current settings from the grid by clicking button ii shown in Figure 14. Also, button i
retrieves the current settings present in the TSC4270 and populates the settings on the runtime
configuration grid. The settings of this grid can be reverted to default valuess by using the Reset button on
the GUI, or by pressing the reset switch on the TSC4270EVM device.
Figure 15. Runtime Configuration Grid, Expanded View
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5.2.3.2 Tunable Flash Parameters Grid
Use the tunable flash parameters grid to adjust the flash parameters of the TSC4270. Changing the
tunable flash parameters grid affects the behavior of the TSC4270. Uploading flash parameters requires
the service keys that are entered in the window that appears when selecting Download Flash Parameters
to TSC from the Options menu. Parameters such as sensor configuration and AFE settings are adjustable
using the tunable flash parameters grid.
Figure 16. Tunable Flash Parameters Grid, Expanded View
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i. Line Mode ii. Instant Mode iii. Dot Mode
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5.2.4 Touch Report Tab
The default startup tab of the EVM GUI is the Touch Report tab. This tab consists of a touch map that can
be used to visualize finger and palm touches on the panel. Figure 17 shows the three available plotting
options:
(i) Line Mode: For continuous drawing and linearity tests (keyboard shortcut: press 1).
(ii) Instant Mode: For visualizing real run-time fingers and finger motion on the panel (keyboard shortcut:
press 2).
(iii) Dot Mode: History-enabled tracking of finger coordinates (keyboard shortcut: press 3).
NOTE: Use the number keys on the upper left side of your keyboard for keyboard shortcuts. The
keyboard shortcuts do not work when using the numpad.
Figure 17. Plot Options Available on Touch Report Tab
There is also a real-time list of the finger X and Y coordinates, force, and touch ID.
The Full Speed Log button is a feature where the TSC finger output is logged into a comma-separated
variable (csv) file at the report rate of the TSC.
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5.2.5 Node Report Tab
The second tab is the Node Report tab, as shown in Figure 18. Select this tab to retrieve the current run-
time configuration from the TSC and to change back the bit selection on the run-time parameters to
request the TSC to generate node reports. The Node Report tab requires a finger or an object on the
panel to generate node reports, unless the Cont_Read Enable register from the runtime configuration grid
is turned on.
Figure 18. Node Reports from the TSC When a Finger is Present on Panel
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5.2.6 Calibration Report Tab
The Get Cal Data button in the Calibration Report tab retrieves the current TSC calibration data and
displays it as shown in Figure 19.
Figure 19. Calibration Data
The Log Cal Data button writes the current calibration value into a csv file.
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5.2.7 Device Information Tab
The Device Information tab retrieves the current configuration, firmware ID, and other device-specific
information, as shown in Figure 20. This tab also shows the mapping of all the keyboard shortcuts
available in the EVM GUI. The Copy to Clipboard button copies the information displayed in the box and
enables the information to be sent to the developer in case of issues.
Figure 20. Device Information
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