Terasic CapSense CY8CMBR2016 User manual

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1.1 Features 2
1.2 About the KIT 4
1.3 Getting Help 4
1.4 Reference Documents 4
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2.1 Layout and Components 5
2.2 Block Diagram 6
2.3 Kit Power 7
2.4 Default Switch and Jumper Settings 8
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3.1 User Input/ Output 11
3.2 Host Communication Header 15
3.3 Sensor Module Header 16
3.4 Power Supply 16
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4.1 LED Project Example 17
4.2 Jumper Configuration Example A 17
4.3 Jumper Configuration Example B 18
4.4 Firmware Functionality 19
4.5 Demonstration Setup 21
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5.1 Revision History 22
5.2 Copyright Statement 22

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The CY8CMBR2016 EVK includes a Center Board and a Sensor Module. This kit is designed to
enable users to easily implement a matrix keypad user interface solution using Cypress’s
CY8CMBR2016 CapSense® controller with SmartSense™Auto-Tuning technology. This
CY8CMBR2016 CapSense controller is a hardware configurable device that does not require any
software tools, firmware coding, or device programming. Cypress's revolutionary SmartSense ™
auto-tuning algorithm eliminates the need to manually tune the user interface during development
and production ramp. This reduces time to volume and saves valuable engineering time, test time,
and production yield loss. The kit contains 16 capacitive touch buttons organized in a matrix-style
format appropriate for such as fire alarm control panels, security systems, and door locks.
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1. .1 1 F Fe ea at tu ur re es s
Figure 1-1 shows a photograph of the CapSense CY8CMBR2016 Evaluation kit.
Figure 1-1 Layout of the CapSense CY8CMBR2016 Evaluation kit

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Key features of the evaluation kit include:
x4x4 Matrix Solution
oSimultaneous key press enabled
oMechanical matrix interface enabled for backwards compatibility
xUses Cypress’s CY8CMBR2016-24LQXI CapSense Express controller
xSmartSense Auto-Tuning
oAuto-tuning for PCB manufacturing variance
oAdaptive Threshold Auto-tuning for different overlays
oSNR Optimization to obtain robust performance
xConfigurable
oPin configurable buttons
xExpansion Headers
oHost communication header
oSensor module header
xAudio Feedback
oIncludes a buzzer for feedback
xSwitches and Indicators
o16 LEDs
oOne reset push-button switch
xConnectors
oUSB Type mini-AB Port
xSystem Ready
oBOM included
oLayout/Gerber files included

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1
1. .2 2 A Ab bo ou ut t t th he e K KI IT T
The kit comes with the following:
oCypress CY8CMBR2016 EVK –Center Board
oCypress CY8CMBR2016 EVK –Sensor Module
oQuick Start Guide
oAcrylic Board (3 mm and 1.5 mm)
oSystem CD
oUSB A to Mini-B Cable
oPortable Battery-Powered USB Charger (AA)
Figure 1-2 shows the photograph of the Cypress CY8CMBR2016 EVK content.
Figure 1-2 CY8CMBR2016 EVK Package Contents
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1. .3 3 G Ge et tt ti in ng g H He el lp p
For support, please visit:
CapSense Matrix Keypad Solution - From Terasic Technologies
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1. .4 4
R Re ef fe er re en nc ce e D Do oc cu um me en nt ts s
CY8CMBR2016 CapSense Design Guide
CY8CMBR2016 Datasheet

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This chapter covers the architecture of the kit including information on the components, how to
power the kit, and default settings.
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2. .1 1
L
La ay yo ou ut t a an nd d C Co om mp po on ne en nt ts s
Figure 2-1 indicates the locations of the connectors and key components.
Figure 2-1 CY8CMBR2016 EVK with Component Diagram

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2
2. .2 2 B Bl lo oc ck k D Di ia ag gr ra am m
Figure 2-2 shows the block diagram.
Figure 2-2 Block Diagram of CY8CMBR2016 EVK

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2
2. .3 3 K Ki it t P Po ow we er r
The CY8CMBR2016 EVK comes with a preloaded factory configuration to demonstrate the
features of the kit. The factory configurations allow you to quickly ensure that the kit is working
properly. To power-up the board:
1. Connect the Sensor Module to the sensor module header (J20) of the Center Board.
2. Make one of the following power connections:
a. Connect the USB A to Mini-B cable to a USB (Type A) host port and to the board.
b. Connect the portable battery-powered USB connector.
c. Connect a host board to the host communication header (J19).
3. Set the power selection jumper (J22) to match your power connection.
4. Turn on the power switch (SW2).
5. The power LED (D2) should immediately turn on.
6. To get audio and visual feedback when you touch the CapSense buttons, short pins 2 and 3
of the buzzer select jumper (J2) on the Sensor Module. LEDs will indicate which button
you are touching, and a buzzer will sound.

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2
2. .4 4
D
De ef fa au ul lt t S Sw wi it tc ch h a an nd d J Ju um mp pe er r S Se et tt ti in ng gs s
Figure 2-3 Jumper locations
Table 2-1 describes the default jumper settings on the CY8CMBR2016 EVK and its description.
Table 2-1ġ
ġ
Default Jumper Setting and Description of Center Board
Jumper
Default Setting
Description
Buzz Select
(J2)
Select buzzer of Center
B
oard or buzzer of Sensor
Module
.
Buzz
ON/OFF
(J3)
Enable/disable the on-board Buzzer.

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Scan
Rate
(J4,J5,J6)
Configure the Scan Rate between High, Medium,
Low, and Continuous. This jumper configures the
rate at which the sensors are scanned –the higher
the rate, faster the response and higher the power
consumption.
Sensitivity
(J7,J8)
Configure the Sensitivity between High, Medium,
and Low
. This jumper t
unes the sensitivity of all
the sensors
and h
elps set the smallest change in
capacitance desired to be
sensed by the system.
MTS
(J10)
Configure the Enable/Disable Multi
-
Touch Support
(MTS)
. The MTS jumper enables/disables
simultaneous key detections.
This function c
an be
used when at a given instance more than one key
touch is required by the end applic
ation.
ARST
(J9,J11,J12)
Configure the Auto Reset (ARST) between
5s/20s/40s/disable, which indicates the maximum
time a sensor can be active. The ARST sets the auto
reset target for all the sensors, which helps reset
stuck sensors.
Deep Sleep
(J13)
Enable/Disable Deep Sleep on board. This jumper is
used to put the device in deep sleep. When the keys
are not used this pin can be used to put the device
to sleep to save power.
O/P Select
(J14,J15,J16)
Configure the Output Select between Keypad Scan
Interface, Truth Table Interface, LED and Encoded
General Purpose Output (GPO) output. This jumper
helps select the output interface the user needs.
Based on the system requirements, the user can
select the required output mode.
Debug
(J17)
Enable/disable the debug data out through the
RS232 port
.

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Power Select
(J21,J22,J23)
Select the power source from VCC5_HOST or
VADJ_HOST or VCC3P3_HOST or VCC5_USB.
Table 2-2ġ
ġ
Default Jumper Setting and Description of Sensor Module
Jumper
Default Setting
Description
Buzz
ON/OFF
(J2)
Enable/disable the buzzer of Sensor Module.
LED
ON/OFF
(J3)
Enable/disable the 16 LEDs of Sensor Module.

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This chapter provides detailed information on how to use the CY8CMBR2016 Evaluation kit.
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3. .1 1
U
Us se er r I In np pu ut t/ /
O Ou ut tp pu ut t
The user input/ output provides a versatile and reliable drop-in replacement for mechanical matrix
buttons using an output truth table. The pins are connected to LEDs for demonstration purposes, the
LED feature is not available in the CY8CMBR2016 device.
LEDs
The Sensor Module features visual feedback using 16 red LEDs placed above each of the 4 x 4
Matrix CapSense touch buttons. Multiplexing reduces the number of pins required to drive an LED.
The LEDs are arranged into four rows and four columns as shown in Figure 3-1. This allow you to
use four row outputs and four column outputs.
Figure 3-1 LED Arrangement

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Mechanical Matrix Truth Table Output
The truth table for the 4x4 matrix solution is shown below. The dots indicate LED terminal
connections between rows and columns. The button locations are shown in Figure 3-2. GPO_0
through GPO_3 share connections with LED-COL1 through LED-COL4, and GPO_4 through
GPO_7 share connections with LED-ROW1 through LED-ROW4.
Table 3-1 Truth Table
4x4
Matrix Codes
Button Location
0
xx
xx
1
xx
xx
2
xx
xx
3
xx
xx
4
xx
xx
5
xx
xx
6
xx
xx
7
xx
xx
8
xx
xx
9
xx
xx
10
xx
xx
11
xx
xx
12
xx
xx
13
xx
xx
14
xx
xx
15
xx
xx
1
2
3
4
1
2
3
4
LED Column
LED Row

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Figure 3-2 Button Location
Reset Push-Button
The CY8CMBR2016 EVK includes a reset push-button (SW1) to provide a system reset signal for
designs loaded into the PSoC device. The push-button provides a high-logic level when it is
pressed.
Audio Beep Buzzer
The CY8CMBR2016 EVK contains two audio beep buzzers. One is on the Center Board, the other
is on the Sensor Module. They provide audible feedback for button presses.

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4x4 Capacitive Button Matrix
16 CapSense buttons are laid out in a 4x4 matrix on the Sensor Module as shown in Figure 3-3. 12
are standard buttons marked with 0-9, *, and #. The remaining four buttons are unlabeled.
Figure 3-3 CapSense Button Layout

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3
3. .2 2 H Ho os st t C Co om mm mu un ni ic ca at ti io on n
H
He ea ad de er r
The host communication header allows a host to control the kit. The header includes eight GPO
interface pins for host communication plus one INT pin for generating an interrupt for the host
controller. BUZZ_CENTER, SLEEP, and DEBUG signals are also on the header. Because this
header shares a pin connection with the LED interface only one can be used. Figure 3-4 shows the
block diagram for a Encoded Keyscan GPO interface.
Figure 3-4 Encoded Keyscan GPO Interface Block Diagram

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3. .3 3 S Se en ns so or r M Mo od du ul le e H He ea ad de er r
You can connect your own sensor module to the Center Board with the sensor module header.
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3. .4 4 P Po ow we er r S Su up pp pl ly y
Power is provided through the USB Type mini-AB connector (5V) or from a host board through the
host communication header (5V, 3.3V, or VADJ). The Power Selection jumper must match the
power source you are using with the kit.
Power Distribution System
Figure 3-5 shows the power distribution system on the Cypress CY8CMBR2016 EVK.
Figure 3-5 Power Distribution System

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This chapter introduces example projects and firmware features of the CY8CMBR2016 EVK.
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4. .1 1 L LE ED D
P
Pr ro oj je ec ct t E Ex xa am mp pl le e
The first project example demonstrates how a PSoC device can integrate CapSense touch sensing
and visual feedback. The CapSense buttons are configured so that when a button is touched the
corresponding LED turns on. In addition, a buzzer activates whenever a button is pressed.
Note: The CY8CMBR2016 device does not support LED drive capability. The project example is
for demonstration purposes only.
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4. .2 2 J Ju um mp pe er r C Co on nf fi ig gu ur ra at ti io on n
E
Ex xa am mp pl le e
A A
Table 4-1 gives the jumper configuration for Project Example A
Table 4-1
ġ
Jumper Configuration for Example A
Jumper
Default Setting
Description
MTS
(J10)
Configure the
MTS (Multi-
Touch Support) to
Enable
Scan
Rate
(J4,J5,J6)
Configure the Scan Rate to Continuous
ARST
(J9,J11,J12)
Configure the Auto Reset (A
RST) to Disable

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O/P Select
(J14,J15,J16)
Configure the Output Select
to Factory LED
Sensitivity
(J7,J8)
Configure the Sensitivity
to High (0.2pF)
Debug
(J17)
Disable the debug data out through the RS232 port
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4. .3 3
J
Ju um mp pe er r C Co on nf fi ig gu ur ra at ti io on n
E Ex xa am mp pl le e B B
Table 4-2 gives the jumper configuration for Project Example B
Table 4-2ġ
ġ
Jumper Configuration for Example B
Jumper
Default Setting
Description
MTS
(J10)
Configure the MTS (Multi
-
Touch Support) to
Disable
Scan
Rate
(J4,J5,J6)
Configure the
Scan Rate to High
ARST
(J9,J11,J12)
Configure the Auto Reset (ARST)
to 5 seconds

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O/P Select
(J14,J15,J16)
Configure the Output Select
to Factory LED
Sensitivity
(J7,J8)
Configure the Sensitivity
to Low (0.4pF)
Debug (J17)
Enable the debug data out through the RS232 port,
to use the UART port to see the debug data in
Multi Chart Tool. The kit CD will include this tool.
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4. .4 4
F
Fi ir rm mw wa ar re e F Fu un nc ct ti io on na al li it ty y
The LED project example firmware includes the following functions:
SmartSense Auto-Tuning
SmartSense Auto-Tuning automatically compensates for PCB variations, device process variations,
PCB vendor changes, and environmental variations. The device supports a wide parasitic
capacitance range (5 to 40 pF).
Multi-Touch Support
Multi-touch support (MTS) allows multiple buttons to be triggered at the same time. Disabling
MTS ensures that the CapSense controller only reports one button touch at a time.
Note: The CY8CMBR2016 CapSense Design Guide and Datasheet refer to this feature as Flanking
Sensor Suppression (FSS). When MTS is disabled (FSS enabled) if two buttons are touched
simultaneously, only the first button touch detected by the controller will be reported ON.
Auto Reset
The Sensor Auto Reset time is controlled by the ARST jumper. When Auto Reset is enabled, if a
key is pressed for more than 5, 20, or 40 seconds, the device resets the sensor.