Silicon Laboratories ITO Film-F800 User manual

Rev. 0.2 10/09 Copyright © 2009 by Silicon Laboratories ITO Film-F800
ITO Film-F800
ITO FILM C8051F8XX EVALUATION KIT USER’SGUIDE
1. Introduction
The ITO Film Evaluation Kit (KeymatEK) implements a demo using a thin film or plastic printed with Indium Tin
Oxide (ITO). The evaluation board features the Silicon Labs C8051F800 with Shin-Etsu “JCS” ITO Film material
printed with a standard keymat pattern. The shapes, patterns, color ink graphics, and thicknesses of the film may
all be customized for the application. For convenience, the board includes the Silicon Labs ToolStick Base Adapter
circuitry for debugging, a CP210x USB-to-UART bridge for communication, and the QuickSenseTM Firmware API
for sensor performance monitoring and threshold adjustment.
2. Kit Contents
The ITO Film Evaluation Kit contains the following items:
ITO Film Demo Board
ITO Film Demo Board Quick Start Guide
USB Cable
3. Getting Started
3.1. CP210x USB to UART VCP Driver Installation
The ITO Film Evaluation Board includes a Silicon Laboratories CP2103 USB-to-UART Bridge Controller. Device
drivers for the CP2103 need to be installed before the PC software can communicate with the evaluation board
over the USB connection. The CP210x Virtual COM Port (VCP) drivers can be downloaded from the Silicon Labs
“Software Downloads” website (www.silabs.com/mcudownloads). After downloading the drivers, launch the
“unpacker” utility.
1. Follow the steps to copy the driver files to the desired location. The default directory is C:\SiLabs\MCU\CP210x.
2. The final window will give an option to install the driver on the target system. Select the “Launch the CP210x VCP Driver
Installer” option if you are ready to install the driver.
3. If selected, the driver installer will now launch, providing an option to specify the driver installation location. After pressing
the “Install” button, the installer will search your system for copies of previously installed CP210x Virtual COM Port drivers. It
will let you know when your system is up to date. The driver files included in this installation have been certified by Microsoft.
4. If the “Launch the CP210x VCP Driver Installer” option was not selected in step 3, the installer can be found in the location
specified in step 2, by default C:\SiLabs\MCU\CP210x\Windows_2K_XP_S2K3_Vista. At this location, run
CP210xVCPInstaller.exe.
5. If needed, the driver files can be uninstalled by selecting “Silicon Laboratories CP210x USB to UART Bridge Driver
Removal” option in the “Add or Remove Programs” window.
3.2. Running the Demo
Follow these steps to run the ITO Film Evaluation Board Demo:
1. Install the Silicon Labs CP210x USB to UART VCP driver on the target PC following the directions in Section 3.1.
2. Once the VCP driver is installed, connect the F800 ITO Film Board COMM (P2) to the PC using a standard USB cable. The
red PWR LED (DS5) should light up once the board is connected to the PC.
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3. Wait until the green COMM LED (DS6) lights up. This indicates that the CP210x has enumerated and is ready to
communicate with the PC.
4. On the PC, install the Silicon Labs QuickSense Studio software package (www.silabs.com/quicksense).
5. Navigate to the software installation location (C:\SiLabs\MCU\QuickSense_Studio\Software\PerformanceAnalysisTool\ by
default) and run the QuickSense Performance Analysis Tool.
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6. In the Performance Analysis Tool, the “Devices” menu should contain the COM port associated with the CP2103 on the ITO
Film Evaluation Board. Click the COM port and the software will automatically connect to the board.
7. To view the channel data in the Performance Analysis Tool, select a channel by clicking inside the white line surrounding the
button. Press the “Start Acquisition” (Play) button. Then, press the appropriate button on the ITO Film Evaluation Board. The
software will graph the thresholds and measured values for that button.
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8. The final demo setup should look as follows:
Figure 1. ITO Film Evaluation Board Demo Setup
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4. Hardware Overview
The ITO Film Evaluation Board has three different areas: Sensing, Debug, and COMM.
Figure 2. ITO Film Evaluation Board Hardware Overview
4.1. Sensing
The sensing area of the board includes the C8051F800 microcontroller, the ITO Film keypad, and one blue LED
(DS1). The F800 performs all of the measuring, detection, and baselining using the QuickSense Firmware API.
The LED (DS1) will light up when a finger is detected on one of the keypad buttons. The board can be monitored
using the QuickSense Performance Analysis Tool available in the QuickSense Studio.
The F800 is powered from either the Debug or COMM USB connection. This can be modified using the R7 and R9
resistors and the Z1 and Z2 diodes by removing or populating these components as desired. The R7 and R9
resistors are populated and the Z1 and Z2 diodes are not populated by default.
The power consumption of the F800 can be measured independently of other circuitry on the board by removing
the R3 resistor and placing an ammeter across the now-empty pads.
The ITO Film is provided by Shin-Etsu and includes a tail that matches the connector SFV14R-1STE1LF (FCI) on
the PCB.
4.2. Debug
The debug area contains the ToolStick Base Adapter circuitry. In order to debug with the device, the P3 USB
connector should be connected directly to the PC using a standard USB cable. A separate Debug Adapter should
not be used. The Silicon Labs IDE can be used to connect to the device, download code to the device, and debug
firmware.
4.3. COMM
COMM is the UART communications channel for the F800 on the board. The CP2103 converts the UART traffic to
USB traffic and can be connected to on the PC using the CP210x USB-to-UART Virtual COM Port (VCP) drivers.
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5. PC Software Overview
5.1. QuickSenseTM Studio
The QuickSense Studio software facilitates rapid code development and analysis for applications using the Silicon
Labs family of QuickSense products. The Studio is comprised of multiple programs that guide users through an
intuitive development flow, including graphical configuration wizards, firmware templates, and performance moni-
toring tools. These programs interface with the QuickSense Firmware API, a highly configurable open-source firm-
ware library that provides support for many different applications, from simple buttons to complex algorithms like
gesture recognition.
Figure 3. Silicon Labs QuickSense Studio Software
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For detailed information on the QuickSense Studio software including the Performance Analysis Tool, please see
the QuickSense Studio User’s Guide available on the Silicon Labs QuickSense webpage (www.silabs.com/quick-
sense) in the QuickSense Studio section.
5.2. Silicon Laboratories IDE
The Silicon Laboratories IDE integrates a source-code editor, a source-level debugger, and an in-system Flash
programmer. When using the Silicon Labs IDE with the ITO Film Evaluation board, the setup should be as follows:
Figure 4. ITO Film Evaluation Board Debug Setup
5.2.1. IDE System Requirements
The Silicon Laboratories IDE requirements:
Pentium-class host PC running Microsoft Windows 2000 or newer.
One available USB port.
5.2.2. Downloading the Example Firmware Image
The ITO Film Evaluation Kit installer package installs the firmware source code as well as a pre-built Intel HEX
(F800_ITO_Film_EK.hex) image that can be downloaded directly into the board. The firmware source code and an
example IDE project is located in the default path C:\SiLabs\MCU\QuickSense_Studio\Kits\KeymatEK\Firmware\.
The pre-built .HEX image is located in the default path C:\SiLabs\MCU\QuickSense_Studio\Kits\KeymatEK\Firm-
ware\Release\. To update or refresh the .HEX image in the ITO Film Demo Board:
1. Connect the Debug USB port on the ITO Film Demo Board to the PC using a USB cable.
2. Launch the Silicon Labs IDE, and click on OptionsConnection Options.
3. Select “USB Debug Adapter” and then select the board from the list (it should show up as “TSxxxx”).
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4. Select “C2” as the debug interface, and press “OK”.
5. Connect to the board by pressing the “Connect” icon, or using the keyboard shortcut Alt+C.
6. Click on the “Download” icon, or use the keyboard shortcut Alt+D.
7. In the download dialog window, click “Browse”.
8. Change to Files of Type “Intel Hex (*.hex)” and then browse to select the file F800_ITO_Film_EK.hex in the default path
C:\SiLabs\MCU\QuickSense_Studio\Kits\KeymatEK\Firmware\Release\.
9. Click “Open” then “Download”.
10. To run the new image, either press “Go” in the IDE or disconnect from the board (keyboard shortcut Alt+C). It is necessary to
disconnect from the board in the IDE if the Performance Analysis Tool will be used to view data later.
6. Firmware Description
The ITO Film Demo Board firmware uses the QuickSense Firmware API to measure capacitance on the sensing
pads and application layer code turns the board’s LED on or off whenever a pad is pressed. The firmware provides
the following functionality:
Stores measured capacitance values from 13 ITO Film sensor pads.
Compares measured capacitance values against calibrated thresholds to determine if buttons have been
pressed.
If a button’s “active” or “inactive” threshold has been crossed, the API signals an application layer routine to
update the blue LED (DS1).
Using the Serial Interface part of the QuickSense Firmware API, the firmware transmits measured capacitance
values across the CP210x USB-to-UART serial interface to the QuickSense development and display tools.
Baselining algorithm reduces effects of environmental changes such as temperature and humidity on sensing
pad sensitivity.
Figure 5 shows the mapping of the ITO Film sensor pads to QuickSense Firmware API project input channels.
Figure 5. Mapping of Capacitive Sensing Pads to Port Pins and Firmware Input Channels
For a more detailed description of the QuickSense Firmware API or the Serial Interface, see “AN366: QuickSense
API.” For a more detailed description of active/inactive thresholds, see “AN367: Understanding Capacitive Sensing
Signal to Noise Ratios.” For a discussion on baselining in the QuickSense Firmware API, see “AN418: Baselining
in the QuickSense Firmware API.
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7. Schematics
Figure 6. QuickSense C8051F800 ITO Film Evaluation Board (1 of 2)
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Figure 7. QuickSense C8051F800 ITO Film Evaluation Board (2 of 2)
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NOTES:
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CONTACT INFORMATION
Silicon Laboratories Inc.
400 West Cesar Chavez
Austin, TX 78701
Tel: 1+[phone]
Fax: 1+[phone]
Toll Free: 1+[phone]
Please visit the Silicon Labs Technical Support web page:
https://www.silabs.com/support/pages/contacttechnicalsupport.aspx
and register to submit a technical support request.
Silicon Laboratories, Silicon Labs, and QuickSense are trademarks of Silicon Laboratories Inc.
Other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders.
The information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice.
Silicon Laboratories assumes no responsibility for errors and omissions, and disclaims responsibility for any consequences resulting from
theuseofinformationincludedherein.Additionally, Silicon Laboratories assumes no responsibility forthefunctioningofundescribedfeatures
or parameters. Silicon Laboratories reserves the right to make changes without further notice. Silicon Laboratories makes no warranty, rep-
resentation or guarantee regarding the suitability of its products for any particular purpose, nor does Silicon Laboratories assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation conse-
quential or incidental damages. Silicon Laboratories products are not designed, intended, or authorized for use in applications intended to
support or sustain life, or for any other application in which the failure of the Silicon Laboratories product could create a situation where per-
sonal injury or death may occur. Should Buyer purchase or use Silicon Laboratories products for any such unintended or unauthorized ap-
plication, Buyer shall indemnify and hold Silicon Laboratories harmless against all claims and damages.
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