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5.  Peripherals

The starter kit has a set of peripherals that showcase some of the features of the CPT213B device.

Be aware that some CPT213B 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  13  capacitive  sense  touch  pads.  The  touch  pads  are  connected  in  order  to  pins  CS00  -  CS12  of  the  CPT213B
SLEXP8019A. After the touch pad inputs have been processed by the touch qualification engine, the CPT213B SLEXP8019A 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 CPT213B SLEXP8019A Data Sheet for more detailed information on the different configurations.

CS00

CPT213B

Device

CS01

CS02

CS03

CS04

CS05

CS06

CS00
CS01

CS02

CS05

CS03
CS04

CS06

CS07

CS08

CS09

CS10

CS11

CS07
CS08
CS09
CS10
CS11

CS12

CS12

CS12

CS11

CS10

CS09

CS07

CS06

CS05

CS04

CS03

CS02

CS01

CS00

CS08

Figure 5.1.  Capacitive Sense Touch Pads

UG294: CPT213B SLEXP8019A Kit User's Guide

Peripherals

silabs.com

 | Building a more connected world.

Rev. 0.1  |  8

Summary of Contents for CPT213B

Page 1: ...contains easy access breakout pads and other peripherals for user feedback The kit includes the following KEY FEATURES CPT213B 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 13 Capacitive Sense touch pads CPT213B Capacitive Sense Evaluat...

Page 2: ...PT213B 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 After downloading the latest version of Simplicity Studio and installing the software 1 In the Launcher select CPT213B in Dev...

Page 3: ...09 USB Mini B Connector Device Configuration CPT213B I2C IEC Capacitive Sense Device EXP Header Buzzer CS07 CS06 CS05 CS04 CS03 CS02 CS01 CS00 Device Configuration CS08 I2C Figure 2 1 CPT213B SLEXP8019A Block Diagram UG294 CPT213B SLEXP8019A Kit User s Guide Kit Block Diagram silabs com Building a more connected world Rev 0 1 3 ...

Page 4: ...13B device Table 3 1 CPT213B Device Connections CPT213B Pin Assigned Function Expansion Port Connection EXP CS00 Capacitive Sense Pad CS00 CS01 Capacitive Sense Pad CS01 CS02 Capacitive Sense Pad CS02 CS03 Capacitive Sense Pad 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 Capaciti...

Page 5: ... EB_SDA Event Buffer I2C SDA EXP16 EB_INT Event Buffer Interrupt Pin EXP6 RSTb Config Clk Configuration Clock EXP10 Config Data Configuration Data UG294 CPT213B SLEXP8019A Kit User s Guide Kit Hardware Layout silabs com Building a more connected world Rev 0 1 5 ...

Page 6: ...ral to the MCU by providing capacitive sense capabilities 4 2 Standalone In standalone mode the CPT213B SLEXP8019A on the CPT213B 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 t...

Page 7: ... pins To see how the board works in conjunction with the MCU starter kit go to the starter kit s Demos under Getting Started in Simplicity Studio and run CPT213B 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 CPT213B SLEX...

Page 8: ...hrough 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 CPT213B SLEXP8019A Data Sheet for more detailed information on the di...

Page 9: ...mmeter 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 At the top left corner of the board there are three t...

Page 10: ...and 5V power rails are also impor ted The figure below shows the pin assignment of the expansion header The CPT213B SLEXP8019A outputs using I2C The pin assignment of the expansion header and the peripheral function are listed below in the figure and table EB_INT RSTb EB_SDA EB_I2C 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 CPT213...

Page 11: ...7 Simplicity Studio Figure 7 1 Simplicity Studio UG294 CPT213B SLEXP8019A Kit User s Guide Simplicity Studio silabs com Building a more connected world Rev 0 1 11 ...

Page 12: ...to Compatible 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 AN957 TouchXpress Configuration and Profiling Guide Application notes can be accessed within Simplicity Studio under Documentation or on the Silicon Labs website www si labs com interface appno...

Page 13: ...ile 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 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 Capacitiv...

Page 14: ...rent 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 CPT213B SLEXP8019A Current Using AEM UG294 CPT213B SL...

Page 15: ... kit documentation package has been installed To access these documents click the Kit Docu mentation tile after selecting the device in the left pane 9 2 Board Revision History A00 Initial production revision A00 Revision Boards These boards do not currently have any known issues UG294 CPT213B SLEXP8019A Kit User s Guide Schematics Assembly Drawings and BOM silabs com Building a more connected wor...

Page 16: ...mply or express copyright licenses granted hereunder to design or fabricate any integrated circuits The products are not designed or authorized to be used within any Life Support System without the specific written consent of Silicon Labs A Life Support System is any product or system intended to support or sustain life and or health which if it fails can be reasonably expected to result in signif...

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