Texas Instruments TSC2007EVM-PDK User Manual
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User's Guide

SLAU199 – March 2007

TSC2007EVM and TSC2007EVM-PDKUser's Guide

 

This user's guide describes the characteristics, operation, and use of the

 

 

TSC2007EVM, both by itself and as part of the TSC2007EVM-PDK.This evaluation

 

 

module (EVM) is a 4-wiretouch screen controller EVM which also has auxiliary input

 

 

and temperature measurement capabilities. A complete circuit description, schematic

 

 

diagram, and bill of materials are included.

 

 

The following related documents are available through the Texas Instruments Web site

 

 

at www.ti.com.

 

 

 

Table 1. EVM-CompatibleDevice Data Sheets

 

 

DEVICE

LITERATURE NUMBER

 

 

TSC2007

SBAS405

 

 

TAS1020B

SLES025

 

 

REG1117-5

SBVS001

 

 

TPS767D318

SLVS209

 

 

SN74LVC125A

SCAS290

 

 

SN74LVC1G125

SCES223

 

 

SN74LVC1G07

SCES296

 

 

 

Contents

 

1

EVM Overview ...............................................................................................................

 

2

2

Analog Interface..............................................................................................................

 

2

3

Digital Interface ..............................................................................................................

 

3

4

Power Supplies ..............................................................................................................

 

3

5

EVM Operation...............................................................................................................

 

4

6

Kit Operation .................................................................................................................

 

5

7

EVM Bill of Materials ........................................................................................................

 

9

8

TSC2007EVM Schematic .................................................................................................

 

11

9

USB-MODEVM Schematic................................................................................................

 

11

 

 

List of Figures

 

1

TSC2007EVM-PDK Block Diagram ......................................................................................

 

6

2

Default Software Screen ...................................................................................................

 

7

 

 

List of Tables

 

1

EVM-Compatible Device Data Sheets ....................................................................................

 

1

2

Analog Interface Pinout .....................................................................................................

 

2

3

Digital Interface Pinout ......................................................................................................

 

3

4

Power Supply Pinout ........................................................................................................

 

3

5

Power Selection Options - JMP1 ..........................................................................................

 

3

6

List of Jumpers ...............................................................................................................

 

5

7

TSC2007EVM Bill of Materials .............................................................................................

 

9

8

USB-MODEVM Bill of Materials ..........................................................................................

 

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EVM Overview

1

EVM Overview

1.1

Features

 

Full-featuredevaluation board for the TSC20074-wireresistive touch screen controller (TSC).

 

Modular design for use with a variety of DSP and microcontroller interface boards.

 

The TSC2007EVM-PDKis a complete evaluation kit, which includes aUSB-basedmotherboard and

 

evaluation software for use with a personal computer running Microsoft Windows™ operating systems.

1.2

Introduction

 

The TSC2007EVM is in the Texas Instruments modular EVM form factor, which allows direct evaluation of

 

the performance and operating characteristics of the TSC2007, and eases software development and

 

system prototyping. This EVM is compatible with the 5-6KInterface Evaluation Module (SLAU104) from

 

Texas Instruments and additional third-partyboards such as the NISpeedy-33™from National

 

Instruments Corporation. (www.ni.com)

The TSC2007EVM-PDKis a complete evaluation/demonstration kit, which includes aUSB-basedmotherboard called theUSB-MODEVMinterface board and evaluation software for use with a personal computer running Microsoft Windows operating systems.

2Analog Interface

For maximum flexibility, the TSC2007EVM is designed for easy interfacing to multiple analog sources. Samtec part numbers SSW-110-22-F-D-VS-KandTSM-110-01-T-DV-Pprovide a convenient10-pin,dual-rowheader/socket combination at J1. This header/socket provides access to the analog input pins of the TSC. Consult Samtec atwww.samtec.com, or call1-800-SAMTEC-9for a variety of mating connector options.

 

 

Table 2. Analog Interface Pinout

PIN NUMBER

SIGNAL

DESCRIPTION

J1.2

X+

Touch screen X+ electrode

J1.4

X-

Touch screen X- electrode

J1.6

Y+

Touch screen Y+ electrode

J1.8

Y-

Touch screen Y- electrode

J1.10

Unused

 

J1.12

AUX

Auxiliary input, 0 V to VREF

J1.14

Unused

 

J1.16

Unused

 

J1.18

Unused

 

J1.20

Unused

 

J1.15

Unused

 

J1.1-J1.19(odd)

AGND

Analog ground connections (except J1.15)

NI Speedy-33is a trademark of Hyperception, Inc.

I2C is a trademark of Koninklijke Philips Electronics N.V., The Netherlands.

Windows is a trademark of Microsoft Corporation.

SPI is a trademark of Motorola, Inc.

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Digital Interface

3Digital Interface

The TSC2007EVM is designed to easily interface with multiple control platforms. Samtec part numbers SSW-110-22-F-D-VS-KandTSM-110-01-T-DV-Pprovide a convenient10-pin,dual-rowheader/socket combination at J2. This header/socket provides access to the digital control and serial data pins of the TSC. Consult Samtec atwww.samtec.com or call1-800-SAMTEC-9for a variety of mating connector options.

 

 

Table 3. Digital Interface Pinout

PIN NUMBER

SIGNAL

DESCRIPTION

J2.15

PENIRQ

Pen Interrupt Output from TSC

J2.16

SCL

I2C™ bus serial clock

J2.4, J2.10, J2.18

DGND

Digital ground

J2.1-J2.19(odd, except

Unused

 

J2.15)

 

 

J2.20

SDA

I2C bus data line

4Power Supplies

J3 provides connection to the common power bus for the TSC2007EVM. Power is supplied on the pins listed in Table 4.

Table 4. Power Supply Pinout

SIGNAL

 

PIN NUMBER

SIGNAL

Unused

1

2

Unused

Unused

3

4

Unused

DGND

5

6

AGND

+1.8VD

7

8

Unused

+3.3VD

9

10

Unused

When power is supplied to J3, JMP1 allows for one of two different DC voltages to be selected as power for the TSC. See the schematic and PCB silkscreen for details.

The TSC2007EVM-PDKmotherboard (theUSB-MODEVMinterface board) supplies power to J3 of the TSC2007EVM. Power for the motherboard is supplied either through its USB connection or via terminal blocks on the board.

4.1TSC Power

Power for the TSC2007 VCC can be supplied either from the +1.8VD terminal or from the +3.3VD terminal. JMP1 selects which of these voltages is routed to the TSC2007. When JMP1 is in the default factory condition (shunt on pins 2-3),power to the TSC comes from J3.9 (+3.3VD). When the shunt is installed on JMP1 pins1-2,power comes from J3.7 (+1.8VD). Removing the shunt on JMP1, the user can connect any DC power supply between 1.2VD and 3.6VD to VCC by connecting the power to JMP1 pin 2.

Table 5. Power Selection Options - JMP1

SHUNT ON PINS

VDD

VOLTAGE FROM J3 PIN

1-2

+1.8VD

7

2-3

+3.3VD

9

Removed

+1.2VD and +3.6VD

External

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EVM Operation

4.2Stand-AloneOperation

When used as a stand-aloneEVM, power can be applied to TP1, referenced to TP3.

CAUTION

Verify that all power supplies are within the safe operating limits shown on the

TSC2007 data sheet (SBAS405) before applying power to the EVM.

4.3USB-MODEVMInterface Power

The USB-MODEVMinterface board can be powered from several different sources:

USB

6 VDC-10VDC AC/DC external wall supply (not included)

Laboratory power supply

When powered from the USB connection, JMP6 should have a shunt from pins 1-2(this is the default factory configuration). When powered from 6VDC-10VDC, either through the J8 terminal block or J9 barrel jack, JMP6 should have a shunt installed on pins2-3.If power is applied in any of these ways, onboard regulators generate the required supply voltages, and no further power supplies are necessary.

If laboratory supplies are used to provide the individual voltages required by the USB-MODEVMinterface board, JMP6 should have no shunt installed. Voltages then are applied to J2 (+5VA), J3 (+5VD), J4 (+1.8VD), and J5 (+3.3VD). The +1.8VD and +3.3VD also can be generated on the board by the onboard regulators from the +5VD supply; to enable this supply, the switches on SW1 need to be set to enable the regulators by placing them in the ON position (lower position, looking at the board with text readingright-sideup). If +1.8VD and +3.3VD are supplied externally, disable the onboard regulators by placing SW1 switches in the OFF position.

Each power supply voltage has an LED (D1-D7)which lights when the power supplies are active.

5EVM Operation

The following section provides information on the analog input, digital control, and general operating conditions of the TSC2007EVM.

5.1Analog Input

The analog input sources (touch screen and auxiliary input) can be applied directly to J1 (top or bottom side) or through signal-conditioningmodules available for the modular EVM system.

5.2Digital Control

The digital control signals can be applied directly to J2 (top or bottom side). The modular TSC2007EVM also can be connected directly to a DSP or microcontroller interface board, such as the USB-MODEVMinterface board if purchased as part of theTSC2007EVM-PDK.See the product folder for the TSC2007 for a current list of compatible interface and/or accessory boards.

5.3Default Jumper Locations

Table 6 provides a list of jumpers found on the EVM and their factory default conditions.

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Kit Operation

 

 

Table 6. List of Jumpers

JUMPER

SHUNT POSITION

JUMPER DESCRIPTION

JMP1

2-3

Analog power select (default is +3.3VD)

JMP2

Closed

EEPROM address select. When installed and used with the USB-MODEVM,firmware for the

 

 

motherboard is executed from the EEPROM on the TSC2007EVM. This is the default mode.

6Kit Operation

The following section provides information on using the TSC2007EVM-PDK,including setup, program installation, and program usage.

6.1TSC2007EVM-PDKBlock Diagram

A block diagram of the TSC2007EVM-PDKis shown inFigure 1. The evaluation kit consists of two circuit boards connected together. The motherboard is designated as theUSB-MODEVMinterface board; the daughtercard is the TSC2007EVM described previously in this manual.

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Kit Operation

TSC2007EVM

 

 

 

X+

 

 

 

SDA

 

 

 

 

 

 

 

 

 

 

 

 

 

X−

 

 

 

 

 

 

 

 

 

 

 

SCL

 

 

 

 

 

Y+

 

TSC2007

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Y−

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PENIRQ

 

 

 

 

 

AUX

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

EVM Position 1

Control Interface

SPI, I2C

TAS1020B

EVM Position 2

USB 8052

 

USB

 

microcontroller

I2S, AC97

Audio Interface

Figure 1. TSC2007EVM-PDKBlock Diagram

The USB-MODEVMinterface board is intended to be used in USB mode, where control of the installed EVM is accomplished using the onboard USB controller device. However, provision is made for driving all the data buses (I2C, SPI™, and I2S/AC97) externally. The source of these signals is controlled by SW2 on theUSB-MODEVM.

6.2Quick Start

Before installing the TSC2007EVM board on top of the USB-MODEVMboard, checkSW2-1,SW2-2,andSW2-3on theUSB-MODEVMboard to ensure that at least one of these three is OFF

Ensure that the TSC2007EVM is installed on the USB-MODEVMinterface board. The TSC2007EVM should be installed in the topmost position, using J11, J12, and J13 on theUSB-MODEVM.

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Kit Operation

Place the CD-ROMinto your PCCD-ROMdrive. Locate the Setup program on the disk, and run it. The Setup program will install the TSC2007 Evaluation software on your PC.

Accept the license agreement, and continue the installation.

When the installation completes, click Finish on the TSC2007EVM installer window. You may be prompted to restart your computer.

When installation is complete, attach a USB cable from your PC to the USB-MODEVMinterface board. As configured at the factory, the board is powered from the USB interface; so, the power indicator LEDs on theUSB-MODEVMshould light. Once this occurs, launch the TSC2007 evaluation software on your PC. It is suggested that users read thereadme_install.txt file forup-to-date,step-by-stepinstructions.

The software should automatically find the TSC2007EVM, and a screen similar to the one shown in Figure 2 should appear.

Figure 2. Default Software Screen

In order to use the touch screen features, a user needs to connect a 4-wireresistive touch screen to J1 of the TSC2007EVM, as described previously.

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Kit Operation

6.3USB-MODEVMInterface Board

The simple diagram shown in Figure 1 shows only the basic features of theUSB-MODEVMinterface board. The board is built around a TAS1020B streaming audio USB controller with an8051-basedcore. The board features two positions for modular EVMs, or onedouble-wideserial modular EVM may be installed.

For use with the TSC2007, the TSC2007EVM is installed in the topmost EVM slot, which connects the TSC2007 digital control interface to the I2C port, realized using the TAS1020B. Because the TSC2007 has no audio features, the lower EVM slot, which is connected to the TAS1020B digital audio interface, is not used.

As configured from the factory, the board is ready to use with the TSC2007EVM except for SW2, in which case at least one of SW2-1,SW2-2,andSW2-3must be set to OFF.

6.4Program Description

After the TSC2007EVM-PDKsoftware installation (described inSection 6.2), evaluation and development with the TSC2007 can begin.

6.4.1Touch Screen Functions Panel

The touch screen box in this panel is updated when a touch is detected on the touch screen. As the touch screen is drawn on, the motion on the touch screen is translated into pixels on this box. The software takes X, Y, and Z readings which are shown to the right of the touch screen box. As the touch pressure is increased, the pixel size increases; a lighter touch results in smaller pixel sizes.

The Z-valuedisplayed is not what is described in the TSC2007 data sheet, because in the data sheet equation, it is assumed that the sheet resistance of the touch screen being used is known. The value used in this program is calculated by Equation 2 of the TSC2007 data sheet, but without multiplying it by the

RX-plate resistance. This value ranges from 0 to 3, and larger, with larger numbers representing a more forceful press on the screen. Using theMaximum Z Value to Display knob, you can set a threshold so

that the program does not display lightly pressed points. This threshold setting helps to eliminate display of spurious points that may result from touch screen mechanical bouncing.

The display can be cleared by pressing the Clear Graph button on the screen.

6.4.2Data Acquisition Functions Panel

The TSC2007 has provision for measuring one auxiliary input voltages (AUX1) and temperature. This panel displays the measured values for these parameters. Measurements are updated only when the touch screen is not being pressed.

Temperature is displayed using both methods described in the TSC2007 data sheet. Using the TEMP0 and TEMP1 measurements, a temperature reading with 2°C resolution and accuracy is achieved. Using only the TEMP0 measurement, a reading with 0.3°C resolution is possible, but this option requires knowing the TEMP0 value at +25°C; this would normally be a calibration that the user would perform. This program assumes that TEMP0 = 600 mV at +25°C.

6.4.3Configuration Panel

The TSC2007 can be configured to operate in 8-bitor12-bitresolution modes. Control over the mode used is selected in this panel.

In the middle of this panel is an indicator light that shows the I2C Bus Status. If the TSC2007 is acknowledging the address sent, the light is green; if the TSC2007 cannot acknowledge, the light is red. The address to which the TSC2007 is set is shown in binary format in the box labeledDevice Address A1-A0.The address set here should be "00" when using the TSC2007EVM. Even though the TSC2007 has two pins, A0 and A1, for users to select four different I2C addresses, the TSC2007EVm has only a fixed address 1001000b, where A0=A1="0", because both A0 and A1 are tied to ground. See the TCS2007EVM schematic provided in this document.

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EVM Bill of Materials

The two power-downbits of the TSC2007 can be set from this panel as well. A brief description of the mode selected is shown on the screen when setting these bits; see Table 3 (Command Byte Definitions) of the TSC2007 data sheet (SBAS405) for details on what these bits do.

6.4.4Datalogging

The software can record the data it takes from the TSC2007 to a tab-delimitedfile, suitable for importing into spreadsheets. To do this, first go into theFile menu, and selectLog Data to File..., which opens afile-selectwindow and allows you to specify a file to which to write the data. At the same time, this enables the Datalogging menu.

When ready to begin recording data to a file, select Datalogging Start Logging. Data is written to the file untilDatalogging Stop Logging is selected. When the screen is not touched, the AUX and TEMP values are written to the file, and the X, Y, Z1, and Z2 parameters are written to the file with values of9999, to indicate that they are not updated. When the screen is touched, the X, Y, Z1, and Z2 parameters are written while the AUX and TEMP values are written to the file as9999. Because the program constantly updates at a rate of about 400 readings per second, datalog files can quickly grow large; therefore, log only that data which is necessary.

The format of the data file has the first column as the time in milliseconds (which is just a timer in the program; it can arbitrarily start at any number), then X, Y, Z1, Z2, AUX, TEMP0, and TEMP1 columns. Every new reading is a new row in the file.

7EVM Bill of Materials

Table 7 andTable 8 contain a complete bill of materials for the modular TSC2007EVM evaluation board and theUSB-MODEVMinterface board, respectively (included only in theTSC2007EVM-PDK).

Table 7. TSC2007EVM Bill of Materials

Reference Designator

Description

Manufacturer

Manufacturer'sPart Number

 

R1

100Ω 1/8W 5% Chip Resistor

Panasonic

ERJ-6GEYJ101V

 

R2, R3

2.7kΩ 1/10W 5% Chip Resistor

Panasonic

ERJ-3GEYJ272V

 

R4

20kΩ 1/10W 5% Chip Resistor

Panasonic

ERJ-3GEYJ272V

 

C1, C3, C8

0.1µF 16V Ceramic Chip

TDK

C1608X7R1C105K

 

 

Capacitor, +/ - 10%, X7R

 

 

 

C2

10µF 16V Ceramic Chip

TDK

C3216X5R1C106M

 

 

Capacitor, +/ - 20%, X5R

 

 

 

C4-C7

Ceramic Chip Capacitor -

 

 

 

 

Not installed

 

 

 

U1

I2C Touch Screen Controller

Texas Instruments

TSC2007IZZZ

 

U2

64K I2C EEPROM

MicroChip

24AA64-I/SN

 

 

TSC2007EVM PCB

Texas Instruments

6486822

 

J1A, J2A

20-pinSMT plug

Samtec

TSM-110-01-L-DV-P

 

J1B, J2B

20-pinSMT socket

Samtec

SSW-110-22-F-D-VS-K

 

J3A

10-pinSMT plug

Samtec

TSM-105-01-L-DV-P

 

J3B

10-pinSMT socket

Samtec

SSW-105-22-F-D-VS-K

 

JMP2

2-positionjumper , 0 .1" spacing

Samtec

TSW-102-07-L-S

 

JMP1

3-positionjumper , 0 .1" spacing

Samtec

TSW-103-07-L-S

 

TP1

Miniature test point terminal

Keystone Electronics

5000

 

TP2

Miniature test point terminal

Keystone Electronics

5001

 

TP4, TP5, TP6, TP7

Miniature test point terminal

Keystone Electronics

5002

 

TP8

Miniature test point terminal

Keystone Electronics

5004

 

TP9, TP10, TP11

Miniature test point terminal

Keystone Electronics

5003

 

 

Header shorting block

Samtec

SNT-100-BK-G-H

 

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EVM Bill of Materials

Table 8. USB-MODEVMBill of Materials

Reference Designator

Description

Manufacturer

Manufacturer'sPart Number

R4

10Ω 1/10W 5% Chip Resistor

Panasonic

ERJ-3GEYJ100V

R10, R11

27.4Ω 1/16W 1% Chip Resistor

Panasonic

ERJ-3EKF27R4V

R20

75Ω 1/4W 1% Chip Resistor

Panasonic

ERJ-14NF75R0U

R19

220Ω 1/10W 5% Chip Resistor

Panasonic

ERJ-3GEYJ221V

R14, R21, R22

390Ω 1/10W 5% Chip Resistor

Panasonic

ERJ-3GEYJ391V

R13

649Ω 1/16W 1% Chip Resistor

Panasonic

ERJ-3EKF6490V

R9

1.5KΩ 1/10W 5%

Panasonic

ERJ-3GEYJ152V

 

Chip Resistor

 

 

R1, R2, R3, R5, R6, R7, R8

2.7KΩ 1/10W 5%

Panasonic

ERJ-3GEYJ272V

 

Chip Resistor

 

 

R12

3.09KΩ 1/16W 1%

Panasonic

ERJ-3EKF3091V

 

Chip Resistor

 

 

R15, R16

10KΩ 1/10W 5%

Panasonic

ERJ-3GEYJ103V

 

Chip Resistor

 

 

R17, R18

100KΩ 1/10W 5%

Panasonic

ERJ-3GEYJ104V

 

Chip Resistor

 

 

RA1

10KΩ 1/8W Octal Isolated

CTS Corporation

742C163103JTR

 

Resistor Array

 

 

C18, C19

33pF 50V Ceramic

TDK

C1608C0G1H330J

 

Chip Capacitor, ±5%, NPO

 

 

C13, C14

47pF 50V Ceramic

TDK

C1608C0G1H470J

 

Chip Capacitor, ±5%, NPO

 

 

C20

100pF 50V Ceramic

TDK

C1608C0G1H101J

 

Chip Capacitor, ±5%, NPO

 

 

C21

1000pF 50V Ceramic

TDK

C1608C0G1H102J

 

Chip Capacitor, ±5%, NPO

 

 

C15

0.1µF 16V Ceramic

TDK

C1608X7R1C104K

 

Chip Capacitor, ±10%,X7R

 

 

C16, C17

0.33µF 16V Ceramic

TDK

C1608X5R1C334K

 

Chip Capacitor, +/-20%,Y5V

 

 

C9, C10, C11, C12, C22, C23,

1µF 6.3V Ceramic

TDK

C1608X5R0J105K

C24, C25, C26, C27, C28

Chip Capacitor, ±10%, X5R

 

 

C1, C2, C3, C4, C5, C6, C7,

10µF 6.3V Ceramic

TDK

C3216X5R0J106K

C8

Chip Capacitor, ±10%, X5R

 

 

D1

50V, 1A, Diode MELF SMD

Micro Commercial Components

DL4001

D2

Yellow Light Emitting Diode

Lumex

SML-LX0603YW-TR

D3, D4, D6, D7

Green Light Emitting Diode

Lumex

SML-LX0603GW-TR

D5

Red Light Emitting Diode

Lumex

SML-LX0603IW-TR

Q1, Q2

N-ChannelMOSFET

Zetex

ZXMN6A07F

X1

6MHz Crystal SMD

Epson

MA-5056.000M-C0

U8

USB Streaming Controller

Texas Instruments

TAS1020BPFB

U2

5V LDO Regulator

Texas Instruments

REG1117-5

U9

3.3V/1.8V Dual Output LDO

Texas Instruments

TPS767D318PWP

 

Regulator

 

 

U3, U4

Quad, Tri-StateBuffers

Texas Instruments

SN74LVC125APW

U5, U6, U7

Single IC Buffer Driver with

Texas Instruments

SN74LVC1G07DBVR

 

Open Drain o/p

 

 

U10

Single Tri-StateBuffer

Texas Instruments

SN74LVC1G125DBVR

U1

64K 2-WireSerial EEPROM

Microchip

24LC64I/SN

 

I2C

 

 

 

USB-MODEVMPCB

Texas Instruments

6463995

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