Silicon Laboratories CPT007B Manuel utilisateur

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:

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

• CPT007B Capacitive Sense Evaluation

Board

• 1 x acrylic overlay

•Getting Started card

• 1 x mini USB cable

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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.

UG132: CPT007B SLEXP8007A Kit User's Guide

Getting Started

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2. Kit Block Diagram

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

GPIO

CS01

CS00CS02

CS03

CS04CS06

CS05

USB Mini-B

Connector

Device

Configuration

CPT007B

GPIO Capacitive

Sense Device

EXP Header

Buzzer and

LEDs

Figure 2.1. CPT007B SLEXP8007A Block Diagram

UG132: CPT007B SLEXP8007A Kit User's Guide

Kit Block Diagram

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3. Kit Hardware Layout

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

Piezo Buzzer

Output LEDs

Expansion

Header

Capacitive Touch Pads

Config and

Debug USB

CPT007B Device

ToolStick Base

Adapter

Figure 3.1. CPT007B SLEXP8007A Hardware Layout

The CPT007B 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 CPT007B device.

Table 3.1. CPT007B Device Connections

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

OUT0

EXP6

OUT01 Output corresponding to CS01 and LED

OUT1

EXP10

OUT02 Output corresponding to CS02 and LED

OUT2

EXP16

UG132: CPT007B SLEXP8007A Kit User's Guide

Kit Hardware Layout

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CPT007B Pin Assigned Function Expansion Port Connection (EXP)

OUT03 Output corresponding to CS03 and LED

OUT3

EXP15

OUT04 Output corresponding to CS04 and LED

OUT4

EXP5

OUT05 Output corresponding to CS05 and LED

OUT5

EXP7

OUT06 Output corresponding to CS06 and LED

OUT6

EXP9

RSTb / Config Clk Configuration Clock —

Config Data Configuration Data —

UG132: CPT007B SLEXP8007A Kit User's Guide

Kit Hardware Layout

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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.

Automatically

Switches

USB Mini-B

Connector

Internal

ToolStick

LDO

EXP

Header CPT Device

and

Peripherals

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 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 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 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 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.

UG132: CPT007B SLEXP8007A Kit User's Guide

Power and Operation

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4.3 Connected to the Expansion Header

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

UG132: CPT007B SLEXP8007A Kit User's Guide

Power and Operation

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

CS00

CPT007B

Device

CS01

CS02

CS03

CS04

CS05

CS06

CS00

CS01

CS02

CS05

CS03

CS04

CS06

CS01

CS00CS02

CS03

CS04CS06

CS05

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

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.

OUT00

CPT007B

Device

OUT01

OUT02

OUT03

OUT04

OUT05

OUT06

LED0

LED1

LED2

LED5

LED3

LED4

LED6

BUZZER BUZZER

Buzzer and

LEDs

Figure 5.2. LEDs and Buzzer

UG132: CPT007B SLEXP8007A Kit User's Guide

Peripherals

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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.

CS00

CS01

CS02

CS03

CS04

CS05

CS06

Figure 6.1. Breakout Pads

UG132: CPT007B SLEXP8007A Kit User's Guide

Connectors

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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 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 CPT007B SLEXP8007A outputs using GPIO.

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

OUT00

OUT01

OUT02

OUT03

OUT06

OUT05

OUT04

NC NC

CPT Pin

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

UG132: CPT007B SLEXP8007A Kit User's Guide

Connectors

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