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2013 Microchip Technology Inc. DS50002221A-page 1
CAP1xxx Evaluation Board User’s Guide
CAP1xxx Evaluation Board User’s Guide
DS50002221A-page 2 2013 Microchip Technology Inc.
1 Overview
This document provides a description of the software and hardware used to demonstrate the features
of the Microchip CAP1xxx Family of RightTouchTM multiple-channel capacitive touch controllers and
LED drivers. Two evaluation boards are covered in this User's Manual. The CAP1188 evaluation board
contains the largest, full-featured version of the CAP11xx family. The other devices in this family are
the CAP1166, CAP1128, CAP1126, CAP1133, and CAP1106. Likewise, the CAP1298 evaluation board
contains the largest, full-featured version of the CAP12xx family. The other devices in this family are
the CAP1296, CAP1293, CAP1208, CAP1206, and CAP1203.
1.1 References
Readers should be familiar with or have access to the datasheet for the device and the schematic for
the evaluation board.
The datasheet is included with the CD provided with the evaluation board, and can also be
downloaded from the Microchip website at http://www.microchip.com/mtouch.
The schematic is included with the CD provided with the evaluation board.
1.2 The RightTouch Evaluation System
The evaluation system has three major parts, as shown in Figure 1.1:
Customer-provided Windows PC
CAP1xxx graphical user interface (GUI) software (based on National Instruments
TM LabVIEWTM
software)
CAP1xxx Evaluation Board - either the CAP1188 or CAP1298 versions (see Figure 1.2)
CAP1xxx Evaluation Board User’s Guide
2013 Microchip Technology Inc. DS50002221A-page 3
Figure 1.1 CAP1xxx Evaluation System
CAP1188 Device Capacitive
Sensors
LED
Drivers
PIC16F1454
CAP11xx
Evaluation
Board
I2C
PC
with CAP1xxx GUI
USB
CAP1298 Device Capacitive
Sensors
LED
Drivers
PIC16F1459
CAP12xx
Evaluation
Board
I2
C
PC
with CAP1xxx GUI
USB
CAP1xxx Evaluation Board User’s Guide
DS50002221A-page 4 2013 Microchip Technology Inc.
1.2.1 Capacitive Sensing Device on the Evaluation Board
The CAP1188 device was chosen for the evaluation board because it has the most sensors and LEDs
in the CAP11xx family.
Note: The CAP1114 and CAP1214 devices, each with 14 sensors and 11 LED drivers, contain
additional features such as slider support which will be highlighted in their own evaluation
board.
The CAP1298 device was chosen for the evaluation board because it is the superset device in the
family, meaning it has the most sensors and features in the CAP12xx family including the signal guard.
The CAP1188, CAP1166, CAP1128, CAP1126, CAP1133, and CAP1106 are similar, with the exception
of the number of capacitive sensor inputs and LED drivers, as shown in Table 1.1.
Figure 1.2 CAP1xxx Evaluation Board Top View
CAP1xxx Evaluation Board User’s Guide
2013 Microchip Technology Inc. DS50002221A-page 5
The CAP1298, CAP1296, CAP1293, CAP1208, CAP1206, and CAP1203 part of the same family and
so have a very similar feature set, with the major exception being of the number of capacitive sensor
inputs and the guard output, as shown in Table 1.2.
1.2.2 Major Components on the Evaluation Board
Figure 1.3 shows the component side of the CAP1188 evaluation board and highlights some of the
important components.
Table 1.1 CAP11xx Device Differentiation
DEVICE NUMBER OF LED DRIVERS NUMBER OF CAPACITIVE
SENSOR INPUTS
CAP1133 3 3
CAP1106 0 6
CAP1126 2 6
CAP1166 6 6
CAP1128 2 8
CAP1188 8 8
Table 1.2 CAP12xx Family Device Differentiation
DEVICE NUMBER OF CAPACITIVE
SENSORS GUARD
CAP1203 3 No
CAP1293 3 Yes
CAP1206 6 No
CAP1296 6 Yes
CAP1208 8 No
CAP1298 8 Yes
CAP1xxx Evaluation Board User’s Guide
DS50002221A-page 6 2013 Microchip Technology Inc.
Figure 1.3 Evaluation Board Component Side View
PIC16F1455
USB
5V to 3.3V
Regulator
PIC16F1455
Programming
Header
CAP1188
8-pin
Communication
Header
PIC16F1459
USB
PIC16F1459
Programming
Header
CAP1298
8-pin
Communication
Header
CAP1xxx Evaluation Board User’s Guide
2013 Microchip Technology Inc. DS50002221A-page 7
2 Software and Hardware Installation
To begin using the CAP1xxx evaluation board, you only need to supply power by plugging in the USB
connector. However, in order to further evaluate the features of the CAP device, the CAP1xxx GUI
must be installed on a Windows-based computer with a USB port.
2.1 GUI Software Installation
Begin by inserting the CD provided with the evaluation board into the computer. Run the Setup.exe
program located in the root directory of the CD. This steps through the CAP1xxx GUI installation, which
takes less than a minute. Figure 2.1 shows the initial installation screen, which displays briefly as the
setup program loads.
Figure 2.1 Software Installation Step 1
CAP1xxx Evaluation Board User’s Guide
DS50002221A-page 8 2013 Microchip Technology Inc.
Click Next in the Destination Directory window, shown in Figure 2.2. For proper operation, the files
must be installed in the default locations. The default location for the software files is C:\Program
Files\Microchip\Microchip CAP1xxx GUI and for the LabVIEWTM software is C:\Program Files\National
Instruments.
In order to use the LabVIEWTM software, the license agreement must be accepted (see Figure 2.3).
Figure 2.2 Software Installation Step 2
Figure 2.3 Software Installation Step 3
CAP1xxx Evaluation Board User’s Guide
2013 Microchip Technology Inc. DS50002221A-page 9
Follow the on-screen instructions to complete the installation. During installation, shortcuts will be
created on the Windows Start Menu and on the desktop. When installation is complete, the program
will automatically run and begin looking for the PIC16F145x USB to I2C bridge. (see Figure 2.4).
Figure 2.4 RightTouch Evaluation Software Start-up Screen
CAP1xxx Evaluation Board User’s Guide
DS50002221A-page 10 2013 Microchip Technology Inc.
2.2 USB Bridge Installation
To complete the installation, connect the USB mini connector to the EVB and the standard USB
connector to any available USB port on the PC. If the USB Bridge driver has not previously been
installed on the selected USB port, the “Find New Hardware” wizard will pop up on the PC’s screen.
Follow the on-screen instructions to complete the installation process. See Figure 2.5 through
Figure 2.8 for a step by step view of the installation.
Once installation of the USB Bridge is complete, the GUI software will begin communications with the
device on the EVB.
Figure 2.5 USB Bridge Driver Installation Step 1
CAP1xxx Evaluation Board User’s Guide
2013 Microchip Technology Inc. DS50002221A-page 11
Figure 2.6 USB Bridge Driver Installation Step 2
Figure 2.7 USB Bridge Driver Installation Step 3
CAP1xxx Evaluation Board User’s Guide
DS50002221A-page 12 2013 Microchip Technology Inc.
Figure 2.8 USB Bridge Driver Installation Step 4
CAP1xxx Evaluation Board User’s Guide
2013 Microchip Technology Inc. DS50002221A-page 13
3 Quick Start Window
The Quick Start Window provides the same information as the Advanced Window, but reduces the
number of options for a more manageable initial user experience. For more information on what
options are provided on the Quick Start Window and how to use them, refer to the CAP1xxx Quick
Start Guide provided with the CAP1xxx CD.
4 Advanced Tab
4.1 Default Conditions
Communications begin as soon as the CAP1xxx GUI software detects the presence of the CAP1xxx
evaluation board. The GUI then reconfigures the CAP1xxx evaluation board with predetermined values
specific to the evaluation board's hardware. Figure 4.1 shows the default GUI for the CAP1188
evaluation board.
Figure 4.1 Default State of RightTouch GUI with the CAP1188 Evaluation Board
CAP1xxx Evaluation Board User’s Guide
DS50002221A-page 14 2013 Microchip Technology Inc.
4.2 Tips for Using the RightTouch Evaluation System
For many items on the GUI control panels, the register address is listed after the control name.
After communications are established between the GUI and the evaluation board, the GUI will
reconfigure the device. Users can save setting configurations to user-named files which can be
reloaded at any time for quick re-configuration (see Section 4.4, "Save/Load Tab").
QuickLoad options are provided on the right to quickly change the evaluation board's behavior
between 'Buttons', 'Proximity', and 'Metal over Capacitive'.
4.2.1 Numbering Systems Views
Some control panels allow values to be displayed using different numbering systems: Decimal, Hex,
Octal, Binary or SI Notation.
To view a value using a different numbering system, click the indicator to the left of the value in the
cell, shown circled in Figure 4.2.
4.2.2 Keyboard Shortcuts
Some GUI controls have keyboard shortcuts, as shown in Table 4.1.
4.3 Device Information and Datasheet Link
In addition to the device name lighting up on the evaluation board and displaying in the software title
bar, the Device Information Control Panel also shows the device that has been populated on the
Figure 4.2 Numbering System Indicators
Table 4.1 CAP1188 Family EVB GUI Keyboard Shortcuts
GUI CONTROL SHORTCUT CONTROL DESCRIPTION
Run CTRL + R Section 4.5.1, "Stop and Run Buttons"
Load Buttons file F1 Section 4.5.5, "QuickLoad Buttons"
Load Proximity file F2 Section 4.5.5, "QuickLoad Buttons"
Load MOC file F3 Section 4.5.5, "QuickLoad Buttons"
Load Custom1 file F4 Section 4.5.5, "QuickLoad Buttons"
Load Custom2 file F5 Section 4.5.5, "QuickLoad Buttons"
Load Defaults F6 Section 4.5.6, "Defaults Button"
Update All Registers F7 Section 4.5.4, "Update All Registers"
Calibration Activate All F8 Section 4.9, "Sensitivity Control Panel"
Stop F12 Section 4.5.1, "Stop and Run Buttons"
CAP1xxx Evaluation Board User’s Guide
2013 Microchip Technology Inc. DS50002221A-page 15
evaluation board. Figure 4.3 shows the Device Information Control Panel for the CAP1188 evaluation
board.. This control panel also shows the values from reading the Product ID Register (FDh) and
Revision Register (FFh) on the device.
Clicking the Datasheet button opens a browser window that will display a PDF file of the datasheet of
the connected device.
4.4 Save/Load Tab
The Save/Load tab, located in the lower left corner of the Advanced Tab and shown in Figure 4.4,
allows the user to save all the settings that have been configured for the device to allow quick re-
configuration at any time.
Figure 4.3 Device Information Control Panel
CAP1xxx Evaluation Board User’s Guide
DS50002221A-page 16 2013 Microchip Technology Inc.
To save device configuration settings:
Using the GUI, configure the CAP1xxx as desired.
Select the Save/Load tab.
Type in a path, or click the folder icon to browse to your desired save location.
Click the 'SAVE' switch to store the configuration.
Notes:
1. The file should be named with the extension '.txt' or similar plain-text file format. The data is saved
in two columns separated by tabs. The first column is the register's address, and the second
column is the register's value.
2. If a file with the same name already exists, the file will be overwritten and old data will be lost.
3. When a file is loaded, the Auto Clear INT button is disabled. Click it to re-enable auto-clearing of
interrupts (see Section 4.5.2, "Auto Clear INT").
Once a file is saved, it can be recalled at any time by selecting the file in the data path window and
clicking the “LOAD” switch. The file can also be linked to a QuickLoad button (see Section 4.5.5,
"QuickLoad Buttons").
Figure 4.4 Save/Load Tab
CAP1xxx Evaluation Board User’s Guide
2013 Microchip Technology Inc. DS50002221A-page 17
The evaluation board GUI comes with several sample configuration files which vary the settings for
different functions.
4.5 Communications Status and Control Panel
Along the right side of the GUI is the control panel shown in Figure 4.5. This is the Communications
Status and Control Panel, which controls and displays the status of the communications between the
GUI software and the evaluation board and includes buttons for loading configurations. This control
panel is always displayed.
Figure 4.5 Communications Status and Control Panel
CAP1xxx Evaluation Board User’s Guide
DS50002221A-page 18 2013 Microchip Technology Inc.
4.5.1 Stop and Run Buttons
The STOP button, on the Panel shown in Figure 4.5, halts GUI software communication with the
evaluation board. When this button is clicked, the Run button, which has an arrow on it, displays below
the menu bar, as shown in Figure 4.6.
To restart communications between the software and the evaluation board, click the Run button. The
arrow button disappears when communications resume.
To close the program, use the red X in the upper right corner of the window.
4.5.2 Auto Clear INT
When the Auto Clear INT button is enabled (dark gray), the INT bit, ALERT pin, and status indicators
are continuously cleared. When the Auto Clear INT button is disabled (light gray), the user must
manually clear interrupts by clicking the INT indicator on the Status and Control Panel or the Auto Clear
INT button. This is shown in Figure 4.5 at the top of the red highlighted box.
4.5.3 Deep Sleep Indicator
The Deep Sleep indicator located below the Auto Clear INT toggle switch in the upper right and shown
in Figure 4.5, indicates whether the device is in the Deep Sleep state. During normal operation, this
indicator is dark. When the device is placed into the Deep Sleep state, this indicator turns blue (or a
lighter color, depending on the PC settings).
4.5.4 Update All Registers
The Update All Registers button shown in Figure 4.5, will update all values displayed on the GUI
control panels to reflect the current device registers. In order to keep control panel response time
reasonable, only a few of the device registers are read and continuously updated during normal
operation. Clicking the Update All Registers button will automatically cycle refreshing all controls and
readings on the control panel.
The keyboard shortcut is F7.
Figure 4.6 Run Button
CAP1xxx Evaluation Board User’s Guide
2013 Microchip Technology Inc. DS50002221A-page 19
4.5.5 QuickLoad Buttons
The QuickLoad buttons, on the Panel shown in Figure 4.5, allow the user to quickly load configuration
files (see Section 4.4, "Save/Load Tab").
There are five QuickLoad buttons available. Each button is linked to a “.txt” file in your installation
directory that has the filename listed above the button. To link the button to a different file, type the
filename (without the extension) in the box above the button, then click off the field. Figure 4.7 shows
new names for the first two buttons. To load the file, click the button or press the shortcut key listed
next to the button.
The 'Buttons' QuickLoad option will set up the CAP1xxx evaluation board for each sensor to behave
as normal touch buttons. Due to the thin front cover of the evaluation boards, this means the gain is
set to the lowest option, and the sensitivity option is greatly reduced from the maximum.
The 'Proximity' QuickLoad option will set up the CAP1xxx evaluation board for all of the sensors to
detect the proximity of a hand approaching. The gain and sensitivity, in this case, are set very high.
Using this configuration, you can see how the size of the sensors will affect the possible range of
proximity detection.
4.5.6 Defaults Button
The Defaults button, toward the bottom of the red highlighted panel shown in Figure 4.5, loads the
default register settings on the device as described in the datasheet.
The keyboard shortcut is F6.
Figure 4.7 QuickLoad Buttons
CAP1xxx Evaluation Board User’s Guide
DS50002221A-page 20 2013 Microchip Technology Inc.
4.5.7 COM Indicator
The COM indicator, toward the bottom of the Panel shown in Figure 4.5, indicates the status of
communications over the I2C. During normal operation, the COM indicator is dark. If I2C
communications fail, the COM indicator turns red.
4.5.8 I2C Address
I2C Address, at the bottom of the red highlighted panel shown in Figure 4.5, indicates the 2C address
of the device.
4.6 Delta Counts Tab
The Delta Counts tab on the Main window and in the Quick Start window shown in Figure 4.8, displays
the delta counts of the capacitive sensor channels. The Delta Count Register address for each sensor
input is listed below the sensor number.
When the Display Value switch is set to Delta, the number cell below each indicator bar displays the
least significant byte of that channel’s current delta count. When the Display Value switch is set to Max,
Figure 4.8 Delta Counts Tab
CAP1xxx Evaluation Board User’s Guide
2013 Microchip Technology Inc. DS50002221A-page 21
the number cell below each indicator bar displays the max delta count for the channel (when the Max
Enable switch is up). The outline on the top of each indicator bar shows the threshold of the sensor
channel. As a sensor pad is being approached and touched, a black bar displays the actual delta
count.
The Max Enable switch, when set in the upper position, turns on display of thin blue bars that indicate
the maximum delta count for each channel. These bars display the maximum delta count until the Max
Enable switch is set to the lower, “Clear” position.
Settings that control the threshold values are covered in Section 4.9, "Sensitivity Control Panel".
All numbers (except register addresses) on this tab are displayed in decimal format.
4.7 Base Counts Tab
The Base Counts tab on the Main window, shown in Figure 4.9, displays Base, Delta, Current Count,
Calibration Factor, and Capacitance in a register format and includes a Sensitivity control. This tab can
be used to check the sensors' calibration values.
Figure 4.9 Base Counts Tab
CAP1xxx Evaluation Board User’s Guide
DS50002221A-page 22 2013 Microchip Technology Inc.
The formats of values on this control panel can be changed to Hexadecimal, Octal, Binary or SI
Notation by clicking the tap in the front of each data cell (see Section 4.2.1, "Numbering Systems
Views").
The Sensitivity Control section affects the Sensitivity Control Register (1Fh). The Base Shift controls
the scaling and data presentation of the Base Count registers. The higher the value of these bits, the
larger the range and the lower the resolution of the data presented. It should not be necessary to
modify this number.
The Sensitivity drop-down list allows update of the sensitivity multiplier, which controls sensitivity of a
touch detection. This value can also be updated using the Sensitivity bar in the Sensitivity Control
Panel (see Figure 4.11, "Sensitivity Control Panel").
4.8 Register Data Tab
The Register Data tab in the Advanced window shown in Figure 4.10, displays a list of all registers
and allows the user to directly write to any register of the device.
The All Raw Device Registers display shows a scrollable list of registers and their current values. It is
important to note that not all addresses are physical memory locations on the device; these registers
will read “0”. Likewise, some registers shown that are undocumented in the datasheet may have data.
Figure 4.10 Raw Data Tab
CAP1xxx Evaluation Board User’s Guide
2013 Microchip Technology Inc. DS50002221A-page 23
Editing these registers can cause unexpected results. If a mistake is made while making a manual edit
in this window, it may be necessary to revert to the defaults or a stored configuration.
The Single Byte Register Access control allows direct write to any register within the device.
The formats of address and data on this control panel are hexadecimal by default, with the option to
change to Decimal, Octal, Binary or SI Notation (see Section 4.2.1, "Numbering Systems Views").
4.9 Sensitivity Control Panel
The Sensitivity Control Panel provides controls for capacitive sensor input sensitivity and on-demand
calibration, as shown in Figure 4.11.
The Sensitivity bar affects the Sensitivity Control Register (1Fh), which controls the amount of
capacitance change required to affect the sensor's signal.. Clicking the bar changes the setting. The
value selected is also reflected in the Sensitivity cell on the Base Counts Tab.
Occasionally it is desirable to force recalibration of the sensor inputs. Clicking the Calibration Activate
switch will recalibrate the sensor inputs.
Note: This is equivalent to writing 0xFF to the Calibration Activate register (26h).
Figure 4.11 Sensitivity Control Panel
CAP1xxx Evaluation Board User’s Guide
DS50002221A-page 26 2013 Microchip Technology Inc.
4.10.3 Noise Tab
The Noise tab of the Main window's Thresholds section shown in Figure 4.14, contains the threshold
used to detect noise. The Sensor Noise Thresholds are a percentage of the Sensor Thresholds on the
Active tab.
Figure 4.14 Thresholds Control Panel - Noise Tab Displayed
CAP1xxx Evaluation Board User’s Guide
2013 Microchip Technology Inc. DS50002221A-page 27
4.11 Recalibration Configuration Control Panel
On the Advanced window below the Thresholds section is the Recalibration Configuration section
shown in Figure 4.15.
The 'Calibration #samples / time' drop-down menu allows selection of the update time and number of
samples related to the recalibration routine. Negative delta count allows selection of the number of
consecutive negative delta counts necessary to trigger a digital recalibration. Both of these controls
affect the Recalibration Configuration Register (2Fh).
Figure 4.15 Recalibration Configuration Control Panel

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: CAP1128

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