Texas Instruments FDC2114 User manual

FDC2114 and FDC2214 EVM User’s Guide
User's Guide
Literature Number: SNOU138
June 2015

Contents
1 Overview............................................................................................................................. 6
2 Software Setup .................................................................................................................... 7
2.1 System Requirements................................................................................................... 7
2.2 Sensing Solutions GUI and EVM Driver Installation................................................................. 7
3 GUI Operation.................................................................................................................... 11
3.1 Starting the GUI......................................................................................................... 11
3.2 Connecting the EVM ................................................................................................... 12
3.3 Navigating the GUI ..................................................................................................... 14
3.4 Configuring the Device Using Register Page....................................................................... 15
3.4.1 Automatically Updating GUI Register Values Using Auto-Read...................................... 15
3.4.2 Manually Updating Device Register Values ............................................................. 16
3.4.3 Reading Register Values without Auto-Read ........................................................... 19
3.4.4 Saving Device Configuration .............................................................................. 21
3.4.5 Loading Previously Saved Device Configuration ....................................................... 22
3.5 Configuring the Device Using Configuration Page................................................................. 24
3.5.1 Enabling and Disabling Channel Measurements ....................................................... 24
3.5.2 Selecting the Clocking Source ............................................................................ 28
3.5.3 Setting the Measurement Timings........................................................................ 28
3.5.4 Using a Different Sensor .................................................................................. 28
3.5.5 Setting the Power Mode and Sensor Initialization Currents........................................... 31
3.6 Streaming Measurement Data........................................................................................ 33
3.6.1 Choosing Graph Units and Visible Channels ........................................................... 33
3.6.2 Logging data to a file ....................................................................................... 35
3.6.3 Setting the Vertical Axis Scale and Sampling Rate .................................................... 37
3.6.4 Starting and Stopping Measurement Data Acquisition ................................................ 40
3.6.5 Displaying Measurement Data Statistics................................................................. 41
3.6.6 Navigating the GUI's Data Buffer ......................................................................... 43
3.7 Updating the EVM Firmware .......................................................................................... 45
4 FDC2114/2214 EVM Schematics and Layout .......................................................................... 48
5 Bill of Materials .................................................................................................................. 53
Revision History.......................................................................................................................... 57
2Table of Contents SNOU138–June 2015
Submit Documentation Feedback
Copyright © 2015, Texas Instruments Incorporated

www.ti.com
List of Figures
1 FDC2114/2214 Evaluation Module........................................................................................ 6
2 GUI Installer Welcome Page............................................................................................... 7
3 GUI Installer License Agreement .......................................................................................... 8
4 GUI Installer Installation Directory......................................................................................... 8
5 GUI Installer Copying Files................................................................................................. 9
6 EVM Driver Installer Welcome Page...................................................................................... 9
7 EVM Driver Installer In Progress......................................................................................... 10
8 EVM Driver Installer Complete ........................................................................................... 10
9 GUI Installer Complete .................................................................................................... 11
10 GUI Splash Screen......................................................................................................... 12
11 GUI Introduction Page..................................................................................................... 12
12 GUI Disconnected From EVM............................................................................................ 13
13 GUI Connected from EVM ................................................................................................ 13
14 GUI Menu Button........................................................................................................... 14
15 GUI Navigation Menu...................................................................................................... 15
16 Selecting Auto-Read Interval on Register Page........................................................................ 16
17 Selecting a Register's Current Value for Editing on Register Page ................................................. 17
18 Entering New Value for Register on Register Page ................................................................... 17
19 Register Value Updated After Changing Value on Register Page................................................... 18
20 Hovering Mouse Over Register Bit Value on Register Page ......................................................... 18
21 Toggling Register Bit Value on Register Page ......................................................................... 19
22 Selecting a Register on Register Page.................................................................................. 20
23 Reading the Current Device Register Value on Register Page...................................................... 20
24 Save Register Values to File on Register Page........................................................................ 21
25 Choosing a JSON File Name to Save Register Values............................................................... 22
26 Loading Previously Saved Register Values from File on Register Page ........................................... 23
27 Selecting Previously Save Register Value JSON File................................................................. 23
28 Configuring Device to Repeatedly Measure a Single Channel....................................................... 24
29 Selecting Channel 3 for Single Channel Measurements.............................................................. 25
30 Configuring Device to Sequentially Measure Multiple Channels..................................................... 26
31 Selecting Channels 1 and 2 for Sequential Channel Measurements................................................ 26
32 Selecting Channels 1, 2, and 3 for Sequential Channel Measurements............................................ 27
33 Selecting All Channels for Sequential Channel Measurements...................................................... 27
34 Selecting the External Oscillator and Entering its Frequency ........................................................ 28
35 Selecting Fin for Channel Measurements................................................................................ 29
36 Entering the Sensor Inductor Values for Calculating Capacitance Measurements................................ 29
37 Updating Input Measurement Gain for FDC2114...................................................................... 30
38 Updating Input Measurement Offset for FDC2114..................................................................... 31
39 Detecting Optimal Idrive from the Configuration Page................................................................... 32
40 Updating Idrive Code with Recommended Value ........................................................................ 32
41 Selecting Maximum Current Drive for Channel 0 ...................................................................... 33
42 Selecting the Measurement Units for the Data Streaming Graph ................................................... 34
43 Hiding Channel 0 from the Data Streaming Graph .................................................................... 35
44 Select Log File Button on Data Streaming Page....................................................................... 36
45 Selecting the Log File for Data Streaming.............................................................................. 36
46 Selected Log File Shown on Data Streaming Page ................................................................... 37
47 Show Graph Configuration Button on Data Streaming Page......................................................... 38
3
SNOU138–June 2015 List of Figures
Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated

www.ti.com
48 Setting the Data Streaming Sample Rate to 1 Second ............................................................... 38
49 Manually Setting the Vertical Scale on Data Streaming Graph ...................................................... 39
50 Starting Data Acquisition on Data Streaming Graph .................................................................. 40
51 Data Acquisition In Progress on Data Streaming Page............................................................... 40
52 Stopping Data Acquisition on Data Streaming Graph................................................................. 41
53 Show Statistics Button on Data Streaming Graph ..................................................................... 42
54 Data Statistics on Data Streaming Graph............................................................................... 42
55 Moving the Data Graph Sample View................................................................................... 43
56 Changing Number of Samples Displayed in Data Graph............................................................. 44
57 Viewing the Entire Buffer on Data Graph ............................................................................... 44
58 Select TI-TXT File Button on Firmware Upload Page................................................................. 45
59 Selecting TI-TXT Firmware File for Upload to EVM ................................................................... 46
60 Upload Firmware Button on Firmware Upload Page .................................................................. 46
61 Firmware Upload in Progress............................................................................................. 47
62 Firmware Upload Success ................................................................................................ 47
63 USB Connection and Power Circuit...................................................................................... 48
64 FDC2114/2214 ............................................................................................................. 49
65 MSP430 Connections...................................................................................................... 50
66 Layout Top Layer – Signals and Components ......................................................................... 51
67 Layout Mid-Layer 1 – Ground Plane..................................................................................... 51
68 Mid-Layer 2 – Signals and Power Plane................................................................................ 52
69 Layout Bottom Layer – Signals Plane ................................................................................... 52
4List of Figures SNOU138–June 2015
Submit Documentation Feedback
Copyright © 2015, Texas Instruments Incorporated

www.ti.com
List of Tables
1 BOM for FDC2114 EVM................................................................................................... 53
2 BOM for FDC2214 EVM................................................................................................... 55
5
SNOU138–June 2015 List of Tables
Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated

FDC2114 /
FDC2214
Channel 1
Sensor
PCB
Perforations
MSP430 Connector for
custom sensor
Channel 0
Sensor
Sensor
Inductor
User's Guide
SNOU138–June 2015
FDC2114 and FDC2214 EVM User’s Guide
1 Overview
The FDC2114/2214 EVM demonstrates the use of capacitive sensing technology to sense and measure
the presence or position of target objects. The EVM contains two example LC tank sensors that are
connected to the FDC2114/2214 input channels. The latter is controlled by an MSP430, which interfaces
to a host computer.
Figure 1. FDC2114/2214 Evaluation Module
The FDC2114/2214EVM includes two example PCB sensors. Each sensor consists of a single-layer
capacitor plate, a 33pF 1% COG/NP0 capacitor, and a 18μH connected in parallel to form an LC tank.
PCB perforations allow separation of the sensor coils or the microcontroller, so that custom sensors or a
different microcontroller can be connected.
6FDC2114 and FDC2214 EVM User’s Guide SNOU138–June 2015
Submit Documentation Feedback
Copyright © 2015, Texas Instruments Incorporated

www.ti.com Software Setup
2 Software Setup
2.1 System Requirements
The Sensing Solutions GUI supports:
• 64-bit Windows 7
• 64-bit Windows XP
The current GUI does not support 32-bit Windows operating systems. The host machine is required for
device configuration and data streaming. The following steps are necessary to prepare the EVM for the
GUI:
• The GUI and EVM driver must be installed on the host.
• The EVM must be connected to a high speed USB port (USB 2.0 or above).
2.2 Sensing Solutions GUI and EVM Driver Installation
The Sensing Solutions GUI and EVM driver installer is packaged in a zip file. Follow these steps to install
the software.
1. Download the software ZIP file from the EVM tool page
2. Extract the downloaded ZIP file
3. Run the included executable
4. Follow all directions from the installer
Figure 2. GUI Installer Welcome Page
7
SNOU138–June 2015 FDC2114 and FDC2214 EVM User’s Guide
Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated

Software Setup www.ti.com
5. Read the license agreement and if you still wish to install the software, select “I accept the agreement”
and click “Next” as shown in Figure 3
Figure 3. GUI Installer License Agreement
6. Select the installation directory. If the user installing the software is not a system administrator a
directory not with “Program Files” should be chosen instead of the default.
Figure 4. GUI Installer Installation Directory
8FDC2114 and FDC2214 EVM User’s Guide SNOU138–June 2015
Submit Documentation Feedback
Copyright © 2015, Texas Instruments Incorporated

www.ti.com Software Setup
7. Wait for all files to install
Figure 5. GUI Installer Copying Files
8. After the files have copied a device driver installer will start. If prompted about an unsigned driver,
choose to install the driver anyways. If running Windows 8 or 8.1, the PC must be started in a “Safe”
mode to install the unsigned driver.
Figure 6. EVM Driver Installer Welcome Page
9. Wait for the driver to install
9
SNOU138–June 2015 FDC2114 and FDC2214 EVM User’s Guide
Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated

Software Setup www.ti.com
Figure 7. EVM Driver Installer In Progress
10. Click “Finish” after the driver has been installed
Figure 8. EVM Driver Installer Complete
11. Click “Finish” to complete the software installation
10 FDC2114 and FDC2214 EVM User’s Guide SNOU138–June 2015
Submit Documentation Feedback
Copyright © 2015, Texas Instruments Incorporated

www.ti.com GUI Operation
Figure 9. GUI Installer Complete
3 GUI Operation
The section describes how to use the GUI
3.1 Starting the GUI
Follow these steps to start the GUI:
1. Select the windows start menu
2. Select “All programs”
3. Select the “Texas Instruments” folder
4. Select the Sensing Solutions GUI
5. Click “Sensing Solutions GUI”
6. Splash screen will appear for at least two seconds.
• Slower PC’s may show a blank splash screen without any texts for up to 20 seconds
11
SNOU138–June 2015 FDC2114 and FDC2214 EVM User’s Guide
Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated

GUI Operation www.ti.com
Figure 10. GUI Splash Screen
7. After the splash screen is displayed the main window will open. Note: Only one instance of the GUI
may be open at a time!
Figure 11. GUI Introduction Page
3.2 Connecting the EVM
Follow these steps to connect the EVM to the GUI:
1. Attach the EVM to the computer via a micro USB cable
2. The GUI always shows the connection status on the bottom left corner of the GUI
12 FDC2114 and FDC2214 EVM User’s Guide SNOU138–June 2015
Submit Documentation Feedback
Copyright © 2015, Texas Instruments Incorporated

www.ti.com GUI Operation
• The initial release of this GUI does not support multiple GUI instances or multiple devices. To
control multiple EVMs, virtual machines may be used or multiple PC’s are required. Future
releases will support multiple EVMs from a single instance of the GUI.
Figure 12. GUI Disconnected From EVM
Figure 13. GUI Connected from EVM
13
SNOU138–June 2015 FDC2114 and FDC2214 EVM User’s Guide
Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated

GUI Operation www.ti.com
3.3 Navigating the GUI
To navigate to different pages of the GUI follow these steps:
1. Click “Menu” in the upper left corner
Figure 14. GUI Menu Button
2. Select the desired page from the menu shown on the left
14 FDC2114 and FDC2214 EVM User’s Guide SNOU138–June 2015
Submit Documentation Feedback
Copyright © 2015, Texas Instruments Incorporated

www.ti.com GUI Operation
Figure 15. GUI Navigation Menu
3.4 Configuring the Device Using Register Page
The register page allows users to control the device directly with the register values. The user may also
use this page to read the currect register values on the device.
3.4.1 Automatically Updating GUI Register Values Using Auto-Read
Autoread will periodically request the register values on the device. Click the dropdown box next to “Auto
Read” to select the update interval.
15
SNOU138–June 2015 FDC2114 and FDC2214 EVM User’s Guide
Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated

GUI Operation www.ti.com
Figure 16. Selecting Auto-Read Interval on Register Page
3.4.2 Manually Updating Device Register Values
There are two methods to change register values: update the entire register value or change a single bit
within the register. The recommended update mode is always “Immediate” and not “Deferred”. To update
register values, follow these steps.
1. Double-click the current value of the register that needs to be changed. The text will turn into an
editable text box
16 FDC2114 and FDC2214 EVM User’s Guide SNOU138–June 2015
Submit Documentation Feedback
Copyright © 2015, Texas Instruments Incorporated

www.ti.com GUI Operation
Figure 17. Selecting a Register's Current Value for Editing on Register Page
2. Type the new value in hexadecimal into the box and click enter. The text box changes to normal text
and the GUI will send a command to the EVM to update the device register
Figure 18. Entering New Value for Register on Register Page
17
SNOU138–June 2015 FDC2114 and FDC2214 EVM User’s Guide
Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated

GUI Operation www.ti.com
Figure 19. Register Value Updated After Changing Value on Register Page
To change individual bit values rather that entire register values follow these steps.
1. Hover the mouse over the desired bit to change
Figure 20. Hovering Mouse Over Register Bit Value on Register Page
18 FDC2114 and FDC2214 EVM User’s Guide SNOU138–June 2015
Submit Documentation Feedback
Copyright © 2015, Texas Instruments Incorporated

www.ti.com GUI Operation
2. Double-click the bit to toggle its value and the register’s current value will update automatically
Figure 21. Toggling Register Bit Value on Register Page
3.4.3 Reading Register Values without Auto-Read
To read register values follow these steps.
1. Select the register to update by clicking any column of the register row in the table
19
SNOU138–June 2015 FDC2114 and FDC2214 EVM User’s Guide
Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated

GUI Operation www.ti.com
Figure 22. Selecting a Register on Register Page
2. Click the “Read Register” button to update the selected register’s current value and bit values in the
table
Figure 23. Reading the Current Device Register Value on Register Page
20 FDC2114 and FDC2214 EVM User’s Guide SNOU138–June 2015
Submit Documentation Feedback
Copyright © 2015, Texas Instruments Incorporated