Semtech SX8650 Manuale utente
Revision V2.1/June 2010
©2010 Semtech Corp.
SX8650EVK
www.semtech.com
Page 1
ADVANCED COMMUNICATIONS & SENSING
USER GUIDE
Touch
Screen
Interface
SX8650
VDD AUX
X+
Y+
X-
Y-
A0
NIRQ
NRST
SCL
SDA
GND
HOST
Control
I2C
Digital
Filter
ref+
ref- ADCin out
OSCPOR
Vref
SX8650 Evaluation Kit
User’s Guide
Revision V2.1/June 2010
©2010 Semtech Corp.
SX8650EVK
www.semtech.com
Page 2
Section Page
ADVANCED COMMUNICATIONS & SENSING
USER GUIDE
Table of contents
1. General Description................................................................................................................................................. 3
2. Hardware Description .............................................................................................................................................. 3
2.1. Overview.......................................................................................................................................................... 3
2.2. Content ............................................................................................................................................................ 3
2.3. Board .............................................................................................................................................................. 3
2.3.1. Connection to the SX8650 ........................................................................................................................ 3
2.4. Power and analog Interface............................................................................................................................. 4
2.5. Digital Interface................................................................................................................................................ 5
3. Software Description................................................................................................................................................ 5
3.1. Overview.......................................................................................................................................................... 5
3.2. Installation........................................................................................................................................................ 5
3.3. Connecting the EVK......................................................................................................................................... 5
3.4. Starting the GUI ............................................................................................................................................... 6
3.5. Measurements................................................................................................................................................. 6
3.5.1. Overview ................................................................................................................................................... 6
3.5.2. Auxiliary Channel ...................................................................................................................................... 6
3.6. Throughput....................................................................................................................................................... 7
3.6.1. Overview ................................................................................................................................................... 7
3.7. Touch Screen Setup........................................................................................................................................ 8
3.7.1. Overview ................................................................................................................................................... 8
3.8. I2C Setup......................................................................................................................................................... 8
3.8.1. Overview ................................................................................................................................................... 8
3.9. Extras............................................................................................................................................................... 9
3.9.1. Overview ................................................................................................................................................... 9
3.10. Display Registers........................................................................................................................................... 10
3.10.1. Overview ................................................................................................................................................. 10
3.11. Convert .......................................................................................................................................................... 11
3.11.1. Overview ................................................................................................................................................. 11
3.12. View Graph / View Touch Screen.................................................................................................................. 11
3.12.1. Overview ................................................................................................................................................. 11
3.13. Clear Data...................................................................................................................................................... 12
3.13.1. Overview ................................................................................................................................................. 12
3.14. Change Operation Mode................................................................................................................................ 12
3.14.1. Overview ................................................................................................................................................. 12
3.15. Connected/Disconnected............................................................................................................................... 12
3.15.1. Overview ................................................................................................................................................. 12
3.16. Quit ................................................................................................................................................................ 12
3.16.1. Overview ................................................................................................................................................. 12
3.17. Schematics .................................................................................................................................................... 13
3.18. Board outline.................................................................................................................................................. 14
4. References ............................................................................................................................................................ 14
Revision V2.1/June 2010
©2010 Semtech Corp.
SX8650EVK
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ADVANCED COMMUNICATIONS & SENSING
USER GUIDE
1. General Description
This user’s guide describes the characteristics, operation, and use of the SX8650EVK. This evaluation module is a 4-wire
touch screen controller which also has auxiliary input. The hardware and software description and the schematic diagram
are included.
2. Hardware Description
2.1. Overview
The SX8650EVK is the board for evaluation of the 4-wire resistive touch screen controller SX8650. Since SX8650EVK is
provided with a touch-panel, it is easy to check the functionality of the chip.
The EVK and its supporting documentation allows for customers to develop software that can be used in eventual
implementations. No external supply is needed to power the board. A USB cable is provided to connect the EVK to a
Windows based PC for operation of the software.
2.2. Content
The evaluation kit is composed of the following parts:
The board with the SX8650 and the touch screen on the top
A USB cable to connect the board to the PC
A CDROM with the installation files and the user guide
A stylus to write on the touch screen
2.3. Board
The board is split in 2 areas. From the bottom view (component side), the left area is the interface between the USB of the
PC and the SX8650. The right area is dedicated to the SX8650 and the touch screen connectors.
The S_ON switch is the SX8650 power supply switch. A red led is lighted in the ON position. When it is switch off the
SX8650 is not supplied but the interface circuitry is still powered on.
2.3.1. Connection to the SX8650
The left side of JP1 (odd number) is connected to the SX8650 host and the power pins.
The right side of JP1 (even number) is connected to the interface pins of the SX8650.
The jumpers allow the connection between the host and the SX8650. If an external host, power supply, or auxiliary input
should be used, the jumper would be removed.
Table 1 JP1 Pinout
Pin Number Signal Description
JP1(1-3) GND_0 Ground
JP1(3-4) V3V3 1.85V, 3.3V or external supply voltage
JP1(5-6) V3V3PU Unused
JP1(7-8) SCL I2C bus serial clock
JP1(9-10) SDA I2C bus data line
JP1(11-12) NRST SX8650 Reset pin
JP1(13-14) NIRQ SX8650 interrupt pin
JP1(15-16) A0 SX8650 I2C address selection
JP1(17-18) AUX SX8650 Auxiliary input
JP1(19-20) V3V3reg Unused
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J3 header gives access to the J1 or J4 touch screen connectors. The jumpers set in the left vertical row of J3 enable the
connection to J1 connector.
The jumpers set in the horizontal way of J3 enable the connection to J4 connector.
A direct connection via J3 can also be made to adapt other panel connections.
Table 2: J3 pinout
Figure 1. Connection for J1 or J4 connectors
2.4. Power and analog Interface
For maximum flexibility, the SX8650EVK is designed for easy interfacing to multiple analog-sources.
The board is powered from the USB. The S_V switch allows the user to test the SX8650 to 3.3V (switch to the left) or 1.85V
(switch to the right).
If the user want to test the chip with a different supply voltage then the jumper JP1 (3-4) should be removed and an
external voltage connected to JP1 (4). The SX8650 supply voltage range goes from 1.65V to 3.7V.
JP1 (18) gives access to the AUX input.
If the AUX input of the SX8650 is configured as an analog input, an arbitrary signal generator or any analog signal can be
connected on JP1(18).
If the AUX input of the SX8650 is configured to be used as a trigger for conversion, then a square wave generator or any
digital signal can be connected to JP1(18).
Pin Number Signal Description
J3(3) Y- 4-wire touch screen Y- plate voltage supply
J3(7) X- 4-wire touch screen X- plate voltage supply
J3(11) Y+ 4-wire touch screen Y+ plate voltage supply
J3(15) X+ 4-wire touch screen X+ plate voltage supply
J3(17-19) GND_0 Ground
Y-
X-
Y+
X+
GND
Y-
X-
Y+
X+
GND
Connection through J1 Connection through J4
Revision V2.1/June 2010
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SX8650EVK
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ADVANCED COMMUNICATIONS & SENSING
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2.5. Digital Interface
JP1 header also gives access to the digital control and serial data pins of the SX8650.
If an external host is used to test the part, the jumpers JP1 (7-8), JP1 (9-10), JP1 (11-12), JP1 (13-14) should be removed
and the SCL, SDA, NRST and NIRQ signals respectively connected to JP1 (8), JP1 (10), JP1 (12), JP1 (14).
3. Software Description
3.1. Overview
The software is constructed with graphical aids such as radio buttons and check boxes so each setting on the device can
easily be seen in a human readable display along with what the particular setting means. No experience in software
programming is needed to operate the EVK or the SX8650 basic functions.
3.2. Installation
This software requires a Windows 2000/XP/Vista operating system. The software is installed via an installation program.
This is called “SX8650EvaluationKitSetup.exe”. The software will check to see if .NET 3.5 (which is required for the
software) is installed. If it is not, the program will download it from Microsoft and install .NET (NOTE: A reboot may be
required). After the software is installed, FTDI drivers will automatically be (re)installed. After the software is installed, you
should plug the USB connection from the EVK to the PC to complete the installation.
Figure 2. First launch of the SX8650 GUI
Before starting the installation, the EVK must be connected through the USB to the PC and recognized by Windows. By
default, the setup program will install a shortcut to the software in your start menu.
3.3. Connecting the EVK
The USB cable that is provided will connect the EVK to the PC. The S_ON switch should be on the ON position. If the GUI
is launched without an EVK connected and switched on, the program will show in the status that it is not connected. The
Revision V2.1/June 2010
©2010 Semtech Corp.
SX8650EVK
www.semtech.com
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ADVANCED COMMUNICATIONS & SENSING
USER GUIDE
GUI will still show all features available and can be used as a quick demonstration or for specific debug operations. In order
to connect the device once the GUI has been launched, the user must first connect the EVK to the PC via the USB cable.
3.4. Starting the GUI
After starting the GUI, a script will set the device to go into Pen Trigger Mode, enable X-Y to be measured, and then set up
a small power delay. NOTE: Pen Trigger Mode is not selected on startup because this is a command and not a register.
Commands cannot be read, whereas registers can be read.
Please do not disconnect the device while running the GUI. If it is desired to disconnect the EVK, close the GUI first.
3.5. Measurements
3.5.1. Overview
Figure 3. : Measurements
By clicking Measurements, the GUI will allow the user to select what channels to read. If the user is in Manual Conversion
Mode and select Auxiliary Channel, a popup will appear to allow determining how to use the Auxiliary Channel.
3.5.2. Auxiliary Channel
3.5.2.1. Overview
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ADVANCED COMMUNICATIONS & SENSING
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Figure 4. Auxiliary Channel
When in Manual Conversion Mode, the user may use the AUX pin as a trigger to perform conversions or as a standard
analog input.
3.6. Throughput
3.6.1. Overview
Figure 5. Throughput
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The throughput page allows the user to change items that would affect the throughput of the device. Items such as Power
Delay and Set Delay may need to be changed from the default value depending on the touch screen used. NOTE: Set
Delay is similar to Power Delay but only used when a filter is selected.
3.7. Touch Screen Setup
3.7.1. Overview
Figure 6. Touch Screen Setup
When using different touch screens, the Touch Screen Setup page may need to be used. Currently, it will setup
Resistances on the X/Y planes which are used in calculating the pressure and also for determining the correct aspect ratio
for the screen size. Pressure Sensitivity is the number to multiply the final pressure calculation. This creates a larger pen
size for smaller pressure measurements. The default settings correspond to the touch screen used on the EVK.
3.8. I2C Setup
3.8.1. Overview
Revision V2.1/June 2010
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ADVANCED COMMUNICATIONS & SENSING
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Figure 7. I2C Setup
This page is normally not needed but is available in case the user wants to try different I2C frequency settings. However,
since the GUI is using Windows and a USB connection, there is a delay in between I2C commands because of the
Operating System.
3.9. Extras
3.9.1. Overview
Figure 8. Extras
This area allows different demonstration modes to try out the touch screen with. Currently there is only one other mode,
Touchpad Mode.
Revision V2.1/June 2010
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SX8650EVK
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ADVANCED COMMUNICATIONS & SENSING
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3.9.1.1. Touchpad Mode
This mode allows the touch screen to act similar to a standard touchpad.
There are:
Left and Right Buttons
Edge moving (this is when the user moves the finger to an edge and the mouse still moves in that direction.
Left Clicking when just touching the touchpad area really fast.
Dragging (when the user double clicks fast and on the second click moves around on the touchpad).
All settings such as speed and button configuration (swapping of left and right buttons) are done through the control
panel in the standard mouse section.
3.10. Display Registers
3.10.1. Overview
Figure 9. Display Registers
If the user desires to view or modify the registers manually, he/she may do so on the Display Registers page.
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