SLEXP8008A

The kit includes the following: fo r • Getting Started card • 1 x mini USB cable • 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 N ot R ec om m en de d • CPT112S Capacitive Sense Evaluation Board • 1 x acrylic overlay • CPT112S Capacitive Sense device with I2C N ew 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. KEY FEATURES D The CPT112S Capacitive Sense Evaluation Board is an excellent starting point to get familiar with Capacitive Sense touch pads. es ig ns UG133: CPT112S SLEXP8008A Kit User's Guide silabs.com | Smart. Connected. Energy-friendly. Rev. 0.1 UG133: CPT112S SLEXP8008A Kit User's Guide Getting Started 1. Getting Started Hardware To set up the hardware for the CPT112S SLEXP8008A kit: m en de d fo r N ew D es ig ns 1. 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 om 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. ec After downloading the latest version of Simplicity Studio and installing the software: N ot R 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. silabs.com | Smart. Connected. Energy-friendly. Rev. 0.1 | 1 UG133: CPT112S SLEXP8008A Kit User's Guide Kit Block Diagram 2. Kit Block Diagram An overview of the CPT112S Capacitive Sense Evaluation Board is shown in the figure below. CS05 CS06 CS07 CS03 CS09 CS10 CS01 CS11 / Buzzer CS00 N ew D CS08 CS02 es ig ns CS04 I2C CPT112S I2C Capacitive Sense Device m en de d Device Configuration EXP Header fo r USB Mini-B Connector BUZZER Buzzer Note: CS11 button is disabled in the default configuration of the board to enable the buzzer. N ot R ec om Figure 2.1. CPT112S SLEXP8008A Block Diagram silabs.com | Smart. Connected. Energy-friendly. Rev. 0.1 | 2 UG133: CPT112S SLEXP8008A Kit User's Guide Kit Hardware Layout 3. Kit Hardware Layout The layout of the CPT112S Capacitive Sense Evaluation Board is shown below. 4-Channel Capacitive Slider ToolStick Base Adapter es ig ns Config and Debug USB N ew D Expansion Header fo r CPT112S Device Piezo Buzzer Capacitive Touch Pads m en de d 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) Capacitive Sense Slider CS00 — — Capacitive Sense Slider CS01 — — Capacitive Sense Slider CS02 — — Capacitive Sense Slider CS03 — — 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 om CS00 CS01 CS03 N ot R CS04 ec CS02 silabs.com | Smart. Connected. Energy-friendly. Rev. 0.1 | 3 UG133: CPT112S SLEXP8008A Kit User's Guide Kit Hardware Layout Assigned Function Alternate Function Expansion Port Connection (EXP) EB_SCL I2C Clock — EXP15 EB_INT Event Interrupt for the host processor — EXP6 RSTb / Config Clk Configuration Clock — — Config Data Configuration Data — — N ot R ec om m en de d fo r N ew D es ig ns CPT112S Pin silabs.com | Smart. Connected. Energy-friendly. Rev. 0.1 | 4 UG133: CPT112S SLEXP8008A Kit User's Guide Power and Operation 4. 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. Internal ToolStick LDO D Automatically Switches N ew USB Mini-B Connector es ig ns The figure shows how the different power sources are connected to the device. CPT Device and Peripherals m en de d fo r EXP Header 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. 4.2 Standalone om When power is provided through the USB or an external power supply, the device can act as a stand alone device. When it is connected to an EFM MCU Starter Kit through the expansion header, the device acts as a peripheral to the MCU by providing capacitive sense capabilities. R ec 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. N ot 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 features can be configured in Simplicity Studio using [Xpress Configurator], and the capacitive sense data can be viewed in the [Capacitive 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. silabs.com | Smart. Connected. Energy-friendly. Rev. 0.1 | 5 UG133: CPT112S SLEXP8008A Kit User's Guide Power and Operation 4.3 Connected to the Expansion Header The CPT112S Capacitive Sense Evaluation Board is designed to quickly attach to any EFM32 and EFM8 MCU starter kit and jumpstart 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. For more details on the starter kit, see the corresponding starter kit's user guide. es ig ns 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]. N ew D Note: Not all EFM32 starter kits support this expansion board. See the available demos in Simplicity Studio for more information. N ot R ec om m en de d fo r Figure 4.2. CPT112S SLEXP8008A Connected to an Example EFM8SB2 STK silabs.com | Smart. Connected. Energy-friendly. Rev. 0.1 | 6 UG133: CPT112S SLEXP8008A Kit User's Guide Peripherals 5. 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. es ig ns 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 output the result through I2C. The capacitive sense inputs can be configured for different thresholds, debounce counter values, scan periods, gain, scanning methods, 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. CS04 CS05 CS06 CS07 CS08 CS09 CS10 CS11 CS04 CS05 CS06 CS07 CS08 CS09 CS10 CS11 / Buzzer fo r CS04 CS05 CS06 CS07 CS08 CS09 CS10 CS11 N ew D See the CPT112S SLEXP8008A Data Sheet for more detailed information on the different configurations. m en de d CPT112S Device Figure 5.1. Capacitive Sense Touch Pads 5.2 Capacitive Sense Slider The CPT112S 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. N ot R ec om 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 CS01 CS02 CS03 CS00 CS01 CS02 CS03 CS03 CS02 CS01 CS00 CPT112S Device Figure 5.2. Capacitive Sense Slider silabs.com | Smart. Connected. Energy-friendly. Rev. 0.1 | 7 UG133: CPT112S SLEXP8008A Kit User's Guide Peripherals 5.3 Buzzer The device 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 Studio. BUZZER N ew Buzzer D CS11 / BUZZER es ig ns 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. CPT112S Device N ot R ec om m en de d fo r Figure 5.3. Buzzer silabs.com | Smart. Connected. Energy-friendly. Rev. 0.1 | 8 UG133: CPT112S SLEXP8008A Kit User's Guide Connectors 6. 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. es ig ns 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. CS CS CS CS CS CS CS CS CS CS CS CS 11 10 09 08 07 06 05 04 00 01 02 03 Figure 6.1. Breakout Pads N ot R ec om m en de d fo r N ew D 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. silabs.com | Smart. Connected. Energy-friendly. Rev. 0.1 | 9 UG133: CPT112S SLEXP8008A Kit User's Guide Connectors 6.2 Expansion Header On the 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 results from the touch qualification engine are routed out to these pins. Additionally, the VMCU, 3V3, and 5V power rails are also imported. The figure below shows the pin assignment of the expansion header. The CPT112S SLEXP8008A outputs using I2C. N ew D EB SDA NC NC NC NC EB INT NC EB SCL NC NC NC NC NC NC es ig ns The pin assignment of the expansion header and the peripheral function are listed below in the figure and table. fo r CPT Pin Figure 6.2. Expansion Header m en de d Table 6.1. Pins available on Expansion Header CPT112S pin EXP Header pin number EB_SDA 16 EB_SCL 15 6 N ot R ec om EB_INT silabs.com | Smart. Connected. Energy-friendly. Rev. 0.1 | 10 UG133: CPT112S SLEXP8008A Kit User's Guide Simplicity Studio m en de d fo r N ew D es ig ns 7. Simplicity Studio N ot R ec om Figure 7.1. Simplicity Studio silabs.com | Smart. Connected. Energy-friendly. Rev. 0.1 | 11 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: es ig ns 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. Figure 7.2. Simplicity Studio Xpress Configurator N ot R ec om m en de d fo r N ew D 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). silabs.com | Smart. Connected. Energy-friendly. Rev. 0.1 | 12 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-touse 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. es ig ns 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. 4. In the [Control Panel], click [Use Device...] . Once the board is connected, touch and release any of the capacitive sensing touch peripherals on the board to view the raw and processed 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. N ot R ec om m en de d fo r N ew D More information about [Capacitive Sense Profiler] 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 7.3. Simplicity Studio Capacitive Sense Profiler silabs.com | Smart. Connected. Energy-friendly. Rev. 0.1 | 13 UG133: CPT112S SLEXP8008A Kit User's Guide Advanced Energy Monitor 8. Advanced Energy Monitor When the CPT112S Capacitive Sense Evaluation Board is connected to a Silicon Labs STK, the STK's AEM (Advanced Energy Monitor) 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. CPT EXP Board D EFM STK Board es ig ns 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. N ew CPT Device and Peripherals EFM MCU fo r AEM Hardware N ot R ec om m en de d Figure 8.1. Measuring CPT112S SLEXP8008A Current Using AEM silabs.com | Smart. Connected. Energy-friendly. Rev. 0.1 | 14 UG133: CPT112S SLEXP8008A Kit User's Guide Schematics, Assembly Drawings, and BOM 9. Schematics, Assembly Drawings, and BOM N ot R ec om m en de d fo r N ew D es ig ns 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 Documentation] tile after selecting the device in the left pane. silabs.com | Smart. Connected. Energy-friendly. Rev. 0.1 | 15 es ig ns D N ew fo r One-click access to MCU and wireless tools, documentation, software, source code libraries & more. Available for Windows, Mac and Linux! om IoT Portfolio www.silabs.com/IoT m en de d Simplicity Studio SW/HW www.silabs.com/simplicity Quality www.silabs.com/quality Support and Community community.silabs.com N ot R ec Disclaimer Silicon Laboratories intends to provide customers with the latest, accurate, and in-depth documentation of all peripherals and modules available for system and software implementers using or intending to use the Silicon Laboratories products. Characterization data, available modules and peripherals, memory sizes and memory addresses refer to each specific device, and "Typical" parameters provided can and do vary in different applications. Application examples described herein are for illustrative purposes only. Silicon Laboratories reserves the right to make changes without further notice and limitation to product information, specifications, and descriptions herein, and does not give warranties as to the accuracy or completeness of the included information. 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