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UG133: CPT112S SLEXP8008A Kit User's Guide The CPT112S Capacitive Sense Evaluation Board is an excellent starting point to get familiar with Capacitive Sense touch pads The device serves as a user input peripheral for application development. The device can be configured for different touch sense capabilities and also contains easy access breakout pads and other peripherals for user feedback. The kit includes the following: KEY FEATURES
- CPT112S Capacitive Sense device with I2C
- 20-pin expansion header for connection with a Silicon Labs Starter Kit (EFM8 or EFM32) Breakout test points for easy access to touch pads
- Power sources include USB and EXT Header
- 8 Capacitive Sense touch pads
- 4-Channel Capacitive Sense slider
- 1 Buzzer
- CPT112S Capacitive Sense Evaluation Board
- 1 x acrylic overlay Getting Started card
- 1 x mini USB cable
- Getting Started Hardware To set up the hardware for the CPT112S SLEXP8008A kit: Provide power to the board by connecting the DBG USB connector to the PC using the provided USB cable. When a connection has been established successfully, the LED (marked in the picture) lights up. 2. Place the acrylic overlay on the board over the capacitive sense pads. Figure 1.1. Hardware Setup Software The first step to get started with your new CPT112S SLEXP8008A kit is to go to http://www.silabs.com/simplicity The Simplicity Studio software package contains all the tools, drivers, software examples, and documentation needed to use the CPT112S Capacitive Sense Evaluation Board. The board comes preconfigured for a Touch Demo for use with the acrylic overlay. The demo enables the board to recognize touch events and touch release events. Every time a touch is sensed, the touch is communicated on the I2C interface and the buzzer will sound. After downloading the latest version of Simplicity Studio and installing the software: 1. The auto-detect feature in Simplicity Studio can cause a CPT device to miss touches. First disable automatic detection by clicking the [Settings] icon, selecting [Device Manager ]>[TCF Device Discovery ], and selecting [Never ] for [USB Discovery Options ]. Click [OK]. 2. Click the [Refresh detected hardware] button. 3. Select [CPT112S] under [Detected Hardware]. On the board, a successful USB connection is established when the LED next to the USB connector turns on. 4. Click the [Capacitive Sense Profiler] tile. This utility graphs touch-related data and events received from the CPT112S SLEXP8008A for evaluation and analysis. UG133: CPT112S SLEXP8008A Kit User's Guide Getting Started
- Kit Block Diagram An overview of the CPT112S Capacitive Sense Evaluation Board is shown in the figure below. CS11 / BuzzerCS10CS09CS08 USB Mini-B Connector Device Configuration CPT112S I2C Capacitive Sense Device EXP Header Buzzer CS07CS06CS05CS04 BUZZER I2C CS03 CS02 CS01 CS00 Note: CS11 button is disabled in the default configuration of the board to enable the buzzer. Figure 2.1. CPT112S SLEXP8008A Block Diagram UG133: CPT112S SLEXP8008A Kit User's Guide Kit Block Diagram
- Kit Hardware Layout The layout of the CPT112S Capacitive Sense Evaluation Board is shown below. Piezo Buzzer 4-Channel Capacitive Slider Expansion Header Capacitive Touch Pads Config and Debug USB CPT112S Device ToolStick Base Adapter Figure 3.1. CPT112S SLEXP8008A Hardware Layout The CPT112S device on the kit can be connected to external peripherals other than the assigned pin functions using the vias on the board. The table below shows all of the external connections to the fixed function CPT112S device. Table 3.1. CPT112S Device Connections CPT112S Pin Assigned Function Alternate Function Expansion Port Connection (EXP) CS00 Capacitive Sense Slider CS00 — — CS01 Capacitive Sense Slider CS01 — — CS02 Capacitive Sense Slider CS02 — — CS03 Capacitive Sense Slider CS03 — — CS04 Capacitive Sense Pad CS04 — — CS05 Capacitive Sense Pad CS05 — — CS06 Capacitive Sense Pad CS06 — — CS07 Capacitive Sense Pad CS07 — — CS08 Capacitive Sense Pad CS08 — — CS09 Capacitive Sense Pad CS09 — — CS10 Capacitive Sense Pad CS10 — — CS11 / BUZZER Piezo Buzzer Capacitive Sense Pad CS11 — EB_SDA I2C Data — EXP16 UG133: CPT112S SLEXP8008A Kit User's Guide Kit Hardware Layout
CPT112S Pin Assigned Function Alternate Function Expansion Port Connection (EXP) EB_SCL I2C Clock — EXP15 EB_INT Event Interrupt for the host pro- cessor — EXP6 RSTb / Config Clk Configuration Clock — — Config Data Configuration Data — — UG133: CPT112S SLEXP8008A Kit User's Guide Kit Hardware Layout
- Power and Operation
4.1 Power Selection
The CPT112S Capacitive Sense Evaluation Board is designed to be powered by two different sources:
- Through the on-board USB.
- Through the EXP header. The figure shows how the different power sources are connected to the device. Automatically Switches USB Mini-B Connector Internal ToolStick LDO EXP Header CPT Device and Peripherals Figure 4.1. CPT112S SLEXP8008A Power Supply When the USB is connected, the board is powered from the LDO internal to the USB device, which is in turn powered by the USB cable. The board can also be powered externally through the VMCU and GND pins of the expansion header when the board is attached to a power supply or an EFM MCU Starter Kit. When power is provided through the USB or an external power supply, the device can act as a stand alone device. When it is connec- ted to an EFM MCU Starter Kit through the expansion header, the device acts as a peripheral to the MCU by providing capacitive sense capabilities.
4.2 Standalone
In standalone mode, the CPT112S SLEXP8008A on the CPT112S Capacitive Sense Evaluation Board is designed to showcase and test the board's features or act as a breakout board for any application. To operate in this mode, apply power using the USB connector or an external supply. The board can operate on its own to demonstrate and test the board's touch features and functionalities. The CPT112S SLEXP8008A features configurable options such as touch characteristics, output characteristics, and user feedback peripherals. The device's fea- tures can be configured in Simplicity Studio using [Xpress Configurator ], and the capacitive sense data can be viewed in the [Capaci- tive Sense Profiler]. The device can act as a breakout board to extend functionality of a custom board by simply reading the output results on the pins. The touch qualification engine on the device will process the touch information and output the results through I2C. The device outputs can be accessed through the expansion header, and the capacitive sense inputs can be accessed through the vias on the board. UG133: CPT112S SLEXP8008A Kit User's Guide Power and Operation
4.3 Connected to the Expansion Header
Capacitive Sense Evaluation Board is designed to quickly attach to any EFM32 and EFM8 MCU starter kit and jump- start the development of capacitive sense capable applications. Attach the CPT112S Capacitive Sense Evaluation Board to the STK through the expansion header to connect the power and communication pins. To see how the board works in conjunction with the MCU starter kit, go to the starter kit's [Demos] under [Tools] in Simplicity Studio and run [CPT112S Demo]. For more details on the starter kit, see the corresponding starter kit's user guide. Note: Not all EFM32 starter kits support this expansion board. See the available demos in Simplicity Studio for more information. Figure 4.2. CPT112S SLEXP8008A Connected to an Example EFM8SB2 STK UG133: CPT112S SLEXP8008A Kit User's Guide Power and Operation
- Peripherals The starter kit has a set of peripherals that showcase some of the features of the CPT112S device. Be aware that some CPT112S I/O routed to peripherals are also routed to the breakout pads. This must be taken into consideration when using the breakout pads for your application.
5.1 Capacitive Sense Touch Pads
The kit has 12 capacitive sense touch pads. The touch pads are connected in order to pins CS04 - CS11 of the CPT112S SLEXP8008A. After the touch pad inputs have been processed by the touch qualification engine, the CPT112S SLEXP8008A will out- put the result through I2C. The capacitive sense inputs can be configured for different thresholds, debounce counter values, scan periods, gain, scanning meth- ods, touch time-outs, and touch exclusiveness using the [Xpress Configurator] in Simplicity Studio. The device outputs can also be configured for different pin polarities and drive strength. See the CPT112S SLEXP8008A Data Sheet for more detailed information on the different configurations. CS04 CPT112S Device CS05 CS06 CS07 CS08 CS09 CS10 CS04 CS05 CS06 CS09 CS07 CS08 CS10 CS1 1 / BuzzerCS10CS09CS08 CS07CS06CS05CS04 CS11 CS1 Figure 5.1. Capacitive Sense Touch Pads
5.2 Capacitive Sense Slider
SLEXP8008A has 4-channel slider connected to CS00, CS01, CS02, and CS03. The slider output can be viewed in [Capacitive Sense Profiler] using the [Slider] view, and information about the slider position and touch are sent by the CPT112S SLEXP8008A device thorugh the I2C EB protocol to the host processor. The capacitive sense slider inputs can be configured for different thresholds, debounce counter values, scan periods, gain, scanning methods, touch time-outs, and touch exclusiveness using [Xpress Configurator] in Simplicity Studio. CS00 CPT112S Device CS01 CS02 CS03 CS00 CS01 CS02 CS03 CS03 CS02 CS01 CS00 Figure 5.2. Capacitive Sense Slider UG133: CPT112S SLEXP8008A Kit User's Guide Peripherals
5.3 Buzzer
features a buzzer to provide feedback to the user when using the device. The board's buzzer is located to the bottom left of the capacitive sense touch pads and is connected to the CPT112S on the BUZZER pin. The buzzer can be configured to be active or inactive when the touch pads are touched using [Xpress Configurator ] in Simplicity Stu- dio. The buzzer feature can also be disabled using [Xpress Configurator ]. To use the BUZZER pin as a capacitive sensing input, unsolder the R29 resistor to disconnect the Buzzer circuitry from the pin. CPT1 12S Device CS11 / BUZZER BUZZER Buzzer Figure 5.3. Buzzer UG133: CPT112S SLEXP8008A Kit User's Guide Peripherals
- Connectors
6.1 Breakout Pads
The "breakout pads" located on the left of the touch pads are routed to the capacitive sense input traces and power rails. The capacitive sense input traces can be accessed through the vertically aligned vias located in middle of the board on the left of the pads. All 12 CPT112S capacitive sensing touch pads are bound to each via, as well as the BUZZER shared with CS11. Furthermore, above the buzzer, there are two breakout pads for VMCU and GND to measure the active current of the board using an in-circuit ammeter. A 2.54 mm pitch pin header can be soldered in for easy access to these pins. Note: In order for the capacitive sense pins to be connected properly to your application or power to be measured correctly, the 0 ohm resistors must be removed. The 0 ohm resistor for a channel can be found next to the corresponding via on the top side of the board. CS03CS02CS00CS01CS04CS05CS07CS06CS08CS09CS11CS10 Figure 6.1. Breakout Pads UG133: CPT112S SLEXP8008A Kit User's Guide Connectors
6.2 Expansion Header
left hand side of the board is a female expansion header to connect to a Silicon Labs EFM8 or EFM32 Starter Kit (STK). The connecter contains a number of output and communication pins that can be used to communicate with the MCU on the STK. The re- sults from the touch qualification engine are routed out to these pins. Additionally, the VMCU, 3V3, and 5V power rails are also impor- ted. The figure below shows the pin assignment of the expansion header. The CPT112S SLEXP8008A outputs using I2C. The pin assignment of the expansion header and the peripheral function are listed below in the figure and table. EB INT NC EB SDAEB SCL NC NC NC NC NC NC NC NC NC NC CPT Pin Figure 6.2. Expansion Header Table 6.1. Pins available on Expansion Header CPT112S pin EXP Header pin number EB_SDA 16 EB_SCL 15 EB_INT 6 UG133: CPT112S SLEXP8008A Kit User's Guide Connectors
- Simplicity Studio Figure 7.1. Simplicity Studio UG133: CPT112S SLEXP8008A Kit User's Guide Simplicity Studio
7.1 Xpress Configurator
[Xpress Configurator ] provides the necessary tools to modify the CPT112S SLEXP8008A's functionalities for a custom application in an easy-to-use GUI. To use [Xpress Configurator] within Simplicity Studio: 1. Provide power to the board by connecting the USB connector to the PC using the provided USB cable. 2. Click the [Refresh detected hardware] button and select [CPT112S] under [Detected Hardware]. 3. Go to [Tools] and click the [Xpress Configurator] tile. 4. Select the desired configuration for the engine and peripherals. More information about each of the options in [Xpress Configurator] is available in AN0829: "Capacitive Sensing Library Configuration Guide." Application notes can be accessed within Simplicity Studio using the [Application Notes] tile or on the Silicon Labs website (www.silabs.com/interface-appnotes). Figure 7.2. Simplicity Studio Xpress Configurator UG133: CPT112S SLEXP8008A Kit User's Guide Simplicity Studio
7.2 Capacitive Sense Profiler
The [Capacitive Sense Profiler] in Simplicity Studio displays touches, raw and processed data, and noise information in a simple-to- use GUI. Touch and release any of the capacitive sensing peripherals on the board and the profiler will display the data in a table and as a graph over time. To access and setup the [Capacitive Sense Profiler] in [Simplicity Studio]: 1. Provide power to the board by connecting the USB connector to the PC using the provided USB cable. 2. Click the [Refresh detected hardware] button and select the [CPT112S] kit under [Detected Hardware]. 3. Go to [Tools] and select the [Capacitive Sense Profiler] tile. Once the board is connected, touch and release any of the capacitive sensing touch peripherals on the board to view the raw and pro- cessed data. The profiler can view the data as [Raw Data], [ Noise], and [Buttons]. The Buttons view is particularly useful since it shows the state of the capacitive sense touch pads as either on or off. More information about [Capacitive Sense Profiler] is available in AN0829: "Capacitive Sensing Library Configuration Guide." Applica- tion notes can be accessed within Simplicity Studio using the [Application Notes ] tile or on the Silicon Labs website (www.silabs.com/ interface-appnotes). Figure 7.3. Simplicity Studio Capacitive Sense Profiler UG133: CPT112S SLEXP8008A Kit User's Guide Simplicity Studio
- Advanced Energy Monitor When the CPT112S Capacitive Sense Evaluation Board is connected to a Silicon Labs STK, the STK's AEM (Advanced Energy Moni- tor) hardware also measures the CPT112S power consumption using the VMCU connection on the EXP header. By using the [Energy Profiler] in Simplicity Studio, current consumption and voltage can be measured in real time. More details about AEM and its operation can be found in the STK User Guide. Note that AEM will measure the current for all circuitry connected to VMCU, including the STK MCU and the CPT device. EFM STK Board EFM MCU AEM Hardware CPT Device and Peripherals CPT EXP Board Figure 8.1. Measuring CPT112S SLEXP8008A Current Using AEM UG133: CPT112S SLEXP8008A Kit User's Guide Advanced Energy Monitor
- Schematics, Assembly Drawings, and BOM The schematics, assembly drawings and bill of materials (BOM) for the CPT112S Capacitive Sense Evaluation Board are available through Simplicity Studio when the kit documentation package has been installed. To access these documents, click the [Kit Docu- mentation] tile after selecting the device in the left pane. UG133: CPT112S SLEXP8008A Kit User's Guide Schematics, Assembly Drawings, and BOM
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