Silicon Laboratories CPT007B, UG132, SLEXP8007A User Manual

UG132: CPT007B SLEXP8007A Kit User's
Guide

The CPT007 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:

Getting Started card

• CPT007B Capacitive Sense Evaluation
Board

• 1 x acrylic overlay

•

• 1 x mini USB cable

.

KEY FEATURES

• CPT007B Capacitive Sense device with
GPIO

• 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

• 7 Capacitive Sense touch pads, 7 LEDs

• 1 Buzzer

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UG132: CPT007B SLEXP8007A Kit User's Guide

Getting Started

1. Getting Started

Hardware

To set up the hardware for the CPT007B SLEXP8007A kit:

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 CPT007B SLEXP8007A 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
CPT007B 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 paired digital output pin
will go high, the corresponding LED will light up, 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 [CPT007B] 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 CPT007B
SLEXP8007A for evaluation and analysis.

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UG132: CPT007B SLEXP8007A Kit User's Guide

2. Kit Block Diagram

An overview of the CPT007B Capacitive Sense Evaluation Board is shown in the figure below.

Kit Block Diagram

USB Mini-B

Connector

Device

Configuration

CS05

CS03

CS04CS06

CPT007B

GPIO Capacitive

Sense Device

CS01

CS00CS02

EXP Header

GPIO

Buzzer and

LEDs

Figure 2.1. CPT007B SLEXP8007A Block Diagram

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3. Kit Hardware Layout

Piezo Buzzer

Output LEDs

Expansion
Header

Capacitive Touch Pads

Config and
Debug USB

CPT007B Device

ToolStick Base

Adapter

The layout of the CPT007B Capacitive Sense Evaluation Board is shown below.

UG132: CPT007B SLEXP8007A Kit User's Guide

Kit Hardware Layout

The CPT007B device
board. The table below shows all of the external connections to the fixed function CPT007B device.

CPT007B 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 —

BUZZER Piezo Buzzer —

OUT00 Output corresponding to CS00 and LED

Figure 3.1. CPT007B SLEXP8007A Hardware Layout

on the kit can be connected to external peripherals other than the assigned pin functions using the vias on the

Table 3.1. CPT007B Device Connections

OUT0

EXP6

OUT01 Output corresponding to CS01 and LED

OUT02 Output corresponding to CS02 and LED

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EXP10

OUT1

EXP16

OUT2

UG132: CPT007B SLEXP8007A Kit User's Guide

Kit Hardware Layout

CPT007B Pin Assigned Function Expansion Port Connection (EXP)

OUT03 Output corresponding to CS03 and LED

EXP15

OUT3

OUT04 Output corresponding to CS04 and LED

EXP5

OUT4

OUT05 Output corresponding to CS05 and LED

EXP7

OUT5

OUT06 Output corresponding to CS06 and LED

EXP9

OUT6

RSTb / Config Clk Configuration Clock —

Config Data Configuration Data —

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Automatically

Switches

USB

Mini-B

Connector

Internal

ToolStick

LDO

EXP

Header

CPT Device

and

Peripherals

UG132: CPT007B SLEXP8007A Kit User's Guide

4. Power and Operation

4.1 Power Selection

The CPT007 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.

Power and Operation

Figure 4.1. CPT007B SLEXP8007A 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
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 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.

4.2 Standalone

In standalone mode, the CPT007B SLEXP8007A on the CPT007 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 CPT007B SLEXP8007A
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 [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 GPIO. The device outputs can
be accessed through the expansion header, and the capacitive sense inputs can be accessed through the vias on the board.

can also be powered externally through the VMCU and GND pins of the expansion header when the board is attached to a

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4.3 Connected to the Expansion Header

UG132: CPT007B SLEXP8007A Kit User's Guide

Power and Operation

The CPT007 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 CPT007 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 [CPT007B 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. CPT007B SLEXP8007A Connected to an Example EFM8SB2 STK

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CS00

CPT007B

Device

CS01
CS02
CS03
CS04
CS05
CS06

CS00
CS01
CS02

CS05

CS03
CS04

CS06

CS01

CS00CS02

CS03

CS04CS06

CS05

OUT00

CPT007B

Device

OUT01
OUT02
OUT03
OUT04
OUT05
OUT06

LED0
LED1
LED2

LED5

LED3
LED4

LED6

BUZZER

BUZZER

Buzzer and

LEDs

UG132: CPT007B SLEXP8007A Kit User's Guide

Peripherals

5. Peripherals

The starter kit has a set of peripherals that showcase some of the features of the CPT007B device.

Be aware that some CPT007B 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 7 capacitive sense touch pads. The touch pads are connected in order to pins CS00 - CS06 of the CPT007B SLEXP8007A.
After the touch pad inputs have been processed by the touch qualification engine, the CPT007B SLEXP8007A will output the result
through GPIO.

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.

See the CPT007B SLEXP8007A Data Sheet for more detailed information on the different configurations.

Figure 5.1. Capacitive Sense Touch Pads

5.2 LEDs and Buzzer

The device features LEDs and a buzzer to provide feedback to the user when using the device.
There are
to the CPT007B on the OUTn pins.

The board's buzzer is located to the bottom left of the board and is connected to the CPT007B on the BUZZER pin.

The LED and BUZZER outputs can be configured to be active or inactive when the touch pads are touched using Configurator.

7 LEDs located above the capacitive sense touch pads and corresponds 1-to-1 to the touch pads. The LEDs are connected

Figure 5.2. LEDs and Buzzer

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CS00
CS01
CS02
CS03

CS04

CS05

CS06

UG132: CPT007B SLEXP8007A 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.

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 7 CPT007B capacitive sensing touch pads are bound to each via.

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.

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Figure 6.1. Breakout Pads

6.2 Expansion Header

OUT00

OUT01

OUT02

OUT03

OUT06
OUT05
OUT04

NC
NC

NC NC

NC

NC

NC

CPT Pin

UG132: CPT007B SLEXP8007A Kit User's Guide

Connectors

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 CPT007B SLEXP8007A outputs using GPIO.

The pin assignment of the expansion header and the peripheral function are listed below in the figure and table.

Figure 6.2. Expansion Header

Table 6.1. Pins available on Expansion Header

CPT007B pin EXP Header pin number

OUT00 6

OUT01 10

OUT02 16

OUT03 15

OUT04 5

OUT05 7

OUT06 9

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7. Simplicity Studio

UG132: CPT007B SLEXP8007A Kit User's Guide

Simplicity Studio

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Figure 7.1. Simplicity Studio

7.1 Xpress Configurator

UG132: CPT007B SLEXP8007A Kit User's Guide

Simplicity Studio

[Xpress Configurator

] provides the necessary tools to modify the CPT007B SLEXP8007A'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 [CPT007B] 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

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7.2 Capacitive Sense Profiler

UG132: CPT007B SLEXP8007A Kit User's Guide

Simplicity Studio

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.

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 [CPT007B] 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.

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

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EFM STK

Board

EFM

MCU

AEM

Hardware

CPT
Device and
Peripherals

CPT EXP

Board

UG132: CPT007B SLEXP8007A Kit User's Guide

Advanced Energy Monitor

8. Advanced Energy Monitor

When the CPT007B Capacitive Sense Evaluation Board is connected to a Silicon Labs STK, the STK's AEM (Advanced Energy Moni­tor) hardware also measures the CPT007B 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.

Figure 8.1. Measuring CPT007B SLEXP8007A Current Using AEM

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UG132: CPT007B SLEXP8007A Kit User's Guide

Schematics, Assembly Drawings, and BOM

9. Schematics, Assembly Drawings, and BOM

The schematics, assembly drawings and bill of materials (BOM) for the CPT007B 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.

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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. Silicon Laboratories shall have no liability for the consequences of use of the information supplied herein. This document does not imply
or express copyright licenses granted hereunder to design or fabricate any integrated circuits. The products must not be used within any Life Support System without the specific
written consent of Silicon Laboratories. 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 significant personal injury or death. Silicon Laboratories products are generally not intended for military applications. Silicon Laboratories products shall under no
circumstances be used in weapons of mass destruction including (but not limited to) nuclear, biological or chemical weapons, or missiles capable of delivering such weapons.

Trademark Information

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thereof, "the world’s most energy friendly microcontrollers", Ember®, EZLink®, EZMac®, EZRadio®, EZRadioPRO®, DSPLL®, ISOmodem ®, Precision32®, ProSLIC®, SiPHY®,
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