Infineon PSoC CY3290-CYAT8168X User manual

User guide Please read the sections “Important Notice” and “Warnings” at the end of this document 002-16111 Rev. *B
www.infineon.com 2023-06-01
PSoC™ Automotive Multitouch evaluation
kit guide
CY3290-CYAT8168X
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About this document
Scope and purpose
This document describes the CY3290-CYAT8168X evaluation kit. The document includes sections on software
installation, kit bring-up, hardware configuration, and software usage basics. Appended are the schematics,
layouts, and bill of materials.
Intended audience
This document is intended for anyone using the CY3290-CYAT8168X evaluation kit.

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Table of contents
Table of contents
About this document . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Important notice . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Safety precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Table of contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Kit contents . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.2 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3.1 Install PSoC™ Programmer and Touch Tuning Host Emulator (TTHE) . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3.2 Configure CYAT8168X EVK board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3.3 Connect EVK to PC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3.4 Start TTHE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.4 Documentation conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.5 Acronyms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2 Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1 CYAT8168X EVK assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2 Power settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.3 Panel overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.4 CYAT8168X sensor board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
2.5 Isolation bridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
2.6 Supply current measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3 Kit operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.1 Evaluating the EVK with TTHE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
3.2 Bootloading the EVK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.3 Configuring parameters in TTHE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
4 Miscellaneous topics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.1 Panel tuning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.2 TTHE capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.3 Supply voltage reported in TTHE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.4 I2C pins are not physical pins 6 and 8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.5 Programming blank devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4.6 How to open the plastic case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5 Design files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.1 Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.1.1 CYAT8168X sensor board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
5.1.2 Isolation bridge board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.2 Gerber files . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.2.1 CYAT8168X sensor board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.2.2 Isolation bridge board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
5.3 Bill of materials . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.3.1 CYAT8168X sensor board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
5.3.2 Isolation bridge board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Disclaimer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

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Important notice
Important notice
“Evaluation Boards and Reference Boards” shall mean products embedded on a printed circuit board (PCB)
for demonstration and/or evaluation purposes, which include, without limitation, demonstration,
reference and evaluation boards, kits and design (collectively referred to as “Reference Board”).
Environmental conditions have been considered in the design of the Evaluation Boards and Reference
Boards provided by Infineon Technologies. The design of the Evaluation Boards and Reference Boards has
been tested by Infineon Technologies only as described in this document. The design is not qualified in
terms of safety requirements, manufacturing and operation over the entire operating temperature range
or lifetime.
The Evaluation Boards and Reference Boards provided by Infineon Technologies are subject to functional
testing only under typical load conditions. Evaluation Boards and Reference Boards are not subject to the
same procedures as regular products regarding returned material analysis (RMA), process change
notification (PCN) and product discontinuation (PD).
Evaluation Boards and Reference Boards are not commercialized products, and are solely intended for
evaluation and testing purposes. In particular, they shall not be used for reliability testing or production.
The Evaluation Boards and Reference Boards may therefore not comply with CE or similar standards
(including but not limited to the EMC Directive 2004/EC/108 and the EMC Act) and may not fulfill other
requirements of the country in which they are operated by the customer. The customer shall ensure that
all Evaluation Boards and Reference Boards will be handled in a way which is compliant with the relevant
requirements and standards of the country in which they are operated.
The Evaluation Boards and Reference Boards as well as the information provided in this document are
addressed only to qualified and skilled technical staff, for laboratory usage, and shall be used and
managed according to the terms and conditions set forth in this document and in other related
documentation supplied with the respective Evaluation Board or Reference Board.
It is the responsibility of the customer’s technical departments to evaluate the suitability of the Evaluation
Boards and Reference Boards for the intended application, and to evaluate the completeness and
correctness of the information provided in this document with respect to such application.
The customer is obliged to ensure that the use of the Evaluation Boards and Reference Boards does not
cause any harm to persons or third party property.
The Evaluation Boards and Reference Boards and any information in this document is provided "as is" and
Infineon Technologies disclaims any warranties, express or implied, including but not limited to
warranties of non-infringement of third party rights and implied warranties of fitness for any purpose, or
for merchantability.
Infineon Technologies shall not be responsible for any damages resulting from the use of the Evaluation
Boards and Reference Boards and/or from any information provided in this document. The customer is
obliged to defend, indemnify and hold Infineon Technologies harmless from and against any claims or
damages arising out of or resulting from any use thereof.
Infineon Technologies reserves the right to modify this document and/or any information provided herein
at any time without further notice.

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Safety precautions
Safety precautions
Note: Please note the following warnings regarding the hazards associated with development system
Table 1 Safety precautions
Warning: The DC link potential of this board is up to 1000 VDC. When measuring voltage
waveforms by oscilloscope, high voltage differential probes must be used. Failure to do so
may result in personal injury or death.
Warning: The evaluation or reference board contains DC bus capacitors which take time
to discharge after removal of the main supply. Before working on the drive system, wait five
minutes for capacitors to discharge to safe voltage levels. Failure to do so may result in
personal injury or death. Darkened display LEDs are not an indication that capacitors have
discharged to safe voltage levels.
Warning: The evaluation or reference board is connected to the grid input during testing.
Hence, high-voltage differential probes must be used when measuring voltage waveforms
by oscilloscope. Failure to do so may result in personal injury or death. Darkened display
LEDs are not an indication that capacitors have discharged to safe voltage levels.
Warning: Remove or disconnect power from the drive before you disconnect or reconnect
wires, or perform maintenance work. Wait five minutes after removing power to discharge
the bus capacitors. Do not attempt to service the drive until the bus capacitors have
discharged to zero. Failure to do so may result in personal injury or death.
Caution: The heat sink and device surfaces of the evaluation or reference board may
become hot during testing. Hence, necessary precautions are required while handling the
board. Failure to comply may cause injury.
Caution: Only personnel familiar with the drive, power electronics and associated
machinery should plan, install, commission and subsequently service the system. Failure
to comply may result in personal injury and/or equipment damage.
Caution: The evaluation or reference board contains parts and assemblies sensitive to
electrostatic discharge (ESD). Electrostatic control precautions are required when
installing, testing, servicing or repairing the assembly. Component damage may result if
ESD control procedures are not followed. If you are not familiar with electrostatic control
procedures, refer to the applicable ESD protection handbooks and guidelines.
Caution: A drive that is incorrectly applied or installed can lead to component damage or
reduction in product lifetime. Wiring or application errors such as undersizing the motor,
supplying an incorrect or inadequate AC supply, or excessive ambient temperatures may
result in system malfunction.
Caution: The evaluation or reference board is shipped with packing materials that need to
be removed prior to installation. Failure to remove all packing materials that are
unnecessary for system installation may result in overheating or abnormal operating
conditions.

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Introduction
1 Introduction
The CY3290-CYAT8168X PSoC™ Automotive Multitouch Evaluation Kit (EVK) is a touchscreen evaluation platform
based on CYAT8168X, Infineon’s capacitive multi-touch all-point touchscreen technology. The CYAT8168X family
of PSoC™ Automotive Multitouch touchscreen controllers is optimized for performance and supports advanced
features like superior electromagnetic immunity performance as per automotive standards, thick glove (5 mm
thick), water rejection and CAPSENSE™.
1.1 Kit contents
Each kit contains:
• EVK assembly
• CYAT8168X sensor board
• Isolation bridge board
• 10.1-inch touchscreen sensor
• USB 2.0 certified cable
• USB stick with kit installer
•Quickstartguide
1.2 Getting started
To learn the solution quickly and apply it to the design, see “Kit operation” on page 5.
1.3 Installation
1.3.1 Install PSoC™ Programmer and Touch Tuning Host Emulator (TTHE)
The TTHE is a register configurable design tool that runs on the PC and communicates with the CYAT8168X device
over I2C or SPI communication using the Touch Tuning Bridge (TTBridge). It can show finger touches, finger
gestures, large objects, line drawings, and also record statistical data of raw counts, baseline and diff count
values for sensors, along with many other functions.
Install the PSoC Programmer and TTHE software by running cyautorun.exe from the USB stick’s root directory.
Note that the installation process for TTHE also installs PSoC Programmer.
Click Help >Contents on the menu bar to learn more about using TTHE.
1.3.2 Configure CYAT8168X EVK board
Ensure that the switch on the CYAT8168X EVK case is set to “PC”.
1.3.3 Connect EVK to PC
Follow these steps to connect the CYAT8168X EVK to PC:
1. Connect the CYAT8168X EVK assembly to your PC using the USB cable. Make sure the PWR SEL switch is
towards the PC port.
2. Wait for the kit driver enumeration to complete. The power LED (Red) on the sensor board turns ON.

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Introduction
1.3.4 Start TTHE
To launch the TTHE application, navigate to Start > All Programs > Cypress > Touch Tuning Host Emulator >
Touch Tuning Host Emulator.
See “Evaluating the EVK with TTHE” on page 5 for detailed information on running the TTHE application.
1.4 Documentation conventions
Table 1 Document conventions
Convention Usage
Courier New Displays file locations, user-entered text, and source code:
C:\...cd\icc\
Italics Displays file names and reference documentation:
Read about the sourcefile.hex file in the PSoC™ Designer User Guide.
[Bracketed, Bold]Displays keyboard commands in procedures:
[Enter] or [Ctrl] [C]
File > Open Represents menu paths:
File > Open > New Project
Bold Displays commands, menu paths, and icon names in procedures:
Click the File menu, and then click Open.
Times New Roman Displays an equation:
2 + 2 = 4
Text in gray boxes Describes cautions or unique functionality of the product.

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Introduction
1.5 Acronyms
Table 2 Acronyms used in this document
Acronym Definition
DUT Device Under Test
ESD Electrostatic Discharge
FPC Flexible Printed Circuit
I/O Input/Output
I2C Inter-Integrated Circuit
ITO Indium Tin Oxide
MH3 Manhattan-3 pattern
MTK Manufacturing Test Kit
MISO Master In Slave Out (SPI)
MOSI Master Out Slave In (SPI)
PCB Printed Circuit Board
SCL Serial Clock (I2C)
SDA Serial Data (I2C)
SPI Serial Peripheral Interface
SS Slave Select (SPI)
SCLK Serial clock (SPI)
SWD Serial Wire Debug
SWDIO Serial Wire Debug Input/Output
SWDCLK Serial Wire Debug Clock
TRM Technical Reference Manual
TTBridge Touch Tuning Bridge
TTHE Touch Tuning Host Emulator
XRES External Reset. Active low

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Hardware
2 Hardware
2.1 CYAT8168X EVK assembly
The CYAT8168X EVK consists of a CYAT8168X sensor board, isolation bridge for communication with power
isolation, and a 10.1-inch touchscreen sensor enclosed in a plastic case.
Figure 1 shows the front view of the assembly and Figure 2 shows the back view.
Figure 1 CYAT8168X EVK assembly (front view)

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Hardware
Figure 2 CYAT8168X EVK assembly (back view)
2.2 Power settings
The power source for the EVK is selected using the slide switch at the bottom (see Figure 3). The slide switch is
attached to the isolation bridge internal to the kit. In most cases, the PC is the power source and the switch should
be pushed towards the PC port. Power is supplied by the same USB cable used for communication when the PC
port is selected. Power may also be supplied by an external charger (not included with the kit) connected to the
Charger port. See “Isolation bridge” on page 14 for additional details on power selection.
Switching between power sources may interrupt the kit operation if it is currently running in the TTHE. If the kit
becomes unresponsive to touches following a switch between power sources, perform the following steps:
1. Click Disconnect .
2. Click Connect .
3. Click Run .
Figure 3 Power selection slide switch
Isolation bridge board CYAT8168X sensor board

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Hardware
2.3 Panel overview
The CYAT8168X EVK comes with an ITO panel, which has the following features:
• 10.1-inch diagonal length
• 16:9 aspect ratio
• 0.7-mm cover lens thickness
• 0.55-mm sensor lens thickness
• 50-/sq ITO sheet resistance
• Designed with Infineon’s MH3 pattern
• 23 rows and 42 columns
The panel is connected to the CYAT8168X sensor board using a flex connector. The other side of the flex is
attached to two 50-pin connectors on the CYAT8168X sensor board. The flex connector is shown in Figure 4 and
details of the two 50-pin connectors are listed in Table 3.
Hardware design files of the 50-pin connectors are available at the following location:
C:\Program Files (x86)\Cypress\CY3290-CYAT8168X AUTOMOTIVE EVK\<version>\
Hardware\CYAT8168X Sensor Board
Figure 4 10.1-inch touch sensor
Table 3 50-pin connector details
Connector pin
number
Connector J1 Connector J2
Sensor CYAT8168X 100-pin Sensor CYAT8168X 100-pin
1TX17 XY40NCNA
2 TX16 XY39 RX00 XY00
3 TX15 XY38 RX01 XY01
4 TX14 XY37 RX02 XY02
5 TX13 XY36 RX03 XY03
6 TX12 XY35 RX04 XY04
7 TX11 XY34 RX05 XY05
8 TX10 XY33 RX06 XY06

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9 TX09 XY32 RX07 XY07
10 TX08 XY31 RX08 XY08
11 TX07 XY30 RX09 XY09
12 TX06 XY29 RX10 XY10
13 TX05 XY28 RX11 XY11
14 TX04 XY27 RX12 XY12
15 TX03 XY26 RX13 XY13
16 TX02 XY25 RX14 XY14
17 TX01 XY24 RX15 XY15
18 TX00 XY23 RX16 XY16
19 NC NA RX17 XY17
20 NC NA RX18 XY18
21 NC NA RX19 XY19
22 GND_S VSS RX20 XY20
23 GND_S VSS RX21 XY21
24 GND_S VSS RX22 XY22
25 GND_S VSS GND_S VSS
26 GND_S VSS GND_S VSS
27 RX22 XY22 TX41 XY64
28 RX21 XY21 TX40 XY63
29 RX20 XY20 TX39 XY62
30 RX19 XY19 TX38 XY61
31 RX18 XY18 TX37 XY60
32 RX17 XY17 TX36 XY59
33 RX16 XY16 TX35 XY58
34 RX15 XY15 TX34 XY57
35 RX14 XY14 TX33 XY56
36 RX13 XY13 TX32 XY55
37 RX12 XY12 TX31 XY54
38 RX11 XY11 TX30 XY53
39 RX10 XY10 TX29 XY52
40 RX09 XY09 TX28 XY51
41 RX08 XY08 TX27 XY50
42 RX07 XY07 TX26 XY49
43 RX06 XY06 TX25 XY48
44 RX05 XY05 TX24 XY47
45 RX04 XY04 TX23 XY46
Table 3 50-pin connector details (continued)
Connector pin
number
Connector J1 Connector J2
Sensor CYAT8168X 100-pin Sensor CYAT8168X 100-pin

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Hardware
Note: Sensors Y0 and X0 are located in the top left corner of the panel shown in Figure 5.
Figure 5 Panel with sensor location marked
2.4 CYAT8168X sensor board
The sensor board contains the CYAT8168X device. The CYAT8168X EVK uses an 100-pin TQFP part (CYAT81688-
100AS77). The sensor board for the EVK is shown in Figure 6.
46 RX03 XY03 TX22 XY45
47 RX02 XY02 TX21 XY44
48 RX01 XY01 TX20 XY43
49 RX00 XY00 TX19 XY42
50 NC TX18 XY41
Table 3 50-pin connector details (continued)
Connector pin
number
Connector J1 Connector J2
Sensor CYAT8168X 100-pin Sensor CYAT8168X 100-pin

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Hardware
Figure 6 CYAT8168X EVK sensor board
Connectors J1 and J2 attach to the flex connector on the 10.1-inch glass sensor. The 16-pin header (J4) connects
to the isolation bridge.
Multiple test points are included on the CYAT8168X sensor board to provide access to signals on the CYAT8168X
device, as shown in Table 4.
Table 4 CYAT8168X sensor board test points
Test point in
schematics
Silkscreen CYAT8168X signal Notes
TP1 P0_0 I2C_SCL/SPI_SCLK I2C clock. Pull-up resistors provided by bridge.
TP2 P0_1 I2C_SDA/SPI_MOSI I2C data. Pull-up resistors provided by bridge.
TP3 P2_0 SWDIO Serial wire debug data used for SWD programming.
TP4 P2_1 SWDCLK Serial wire debug clock used for SWD programming.
TP5 XRES nXRES External active LOW reset.
TP6 P1_0 COMM_INT /
SPI_MISO
If I2C, optional INT pin; if SPI, MISO pin.
TP7 P1_1 COMM_INT /
SPI_SS
If I2C, optional INT pin; if SPI, SS pin.
TP8 P1_6 COMM_INT Default INT pin.
TP9 TX_H N/A TX-Host (TTBridge allows for secondary COM port,
not used by this EVK).
TP10 GND_S N/A System ground not directly connected to
CYAT8168X.
TP11 RX_H N/A or COMM_INT /
SPI_SS or ERROR
R119 placement options:
No stuff (default): RX-Host.
Short pins 1-2: P1_1 (COMM INT / SPI SS).
Short pins 2-3: P1_4 (ERROR).
TP12 VCCD VCCD Digital core power supply input/output.
TP13 VDDA VDDA 5 V supplied from Isolation bridge.
TP14 GND_S N/A System ground not directly connected to
CYAT8168X.
Note: These test points are not loaded. Users can use the test pads to measure the signals.

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Hardware
The schematic for the sensor board is shown in the Appendix section, “CYAT8168X sensor board” on page 26.
Hardware design files of the sensor board are available at the following location:
C:\Program Files (x86)\Cypress\CY3290-CYAT8168X AUTOMOTIVE EVK\<version>\Hardware\
CYAT8168X Sensor Board
2.5 Isolation bridge
The isolation bridge is an innovative accessory that provides PC or device bridging and power isolation in a single
device. The isolation bridge is shown in Figure 7.
When the PC port is selected with SW1, both the device under evaluation i.e., the CYAT81688-100AS77 and the
isolation bridge run on PC power through J7. When the Charger port is selected with SW1, the DUT is powered
from the micro-USB connector (J12), commonly used on mobile device chargers. A simple harness can be
constructed to provide battery power through the same interface. A block diagram of the power switching on the
isolation bridge is shown in Figure 8.
Caution: Note that the isolation bridge cannot be used to program the CYAT8168X device. The bootloader function
of the TTHE must be used to upgrade firmware on the CYAT8168X sensor board. Brute (excessive) force on USB
connectors J7 and J12 would snap-off the connector. Please handle delicately during cable insertion and removal.
Figure 7 Isolation bridge
TP15 VDDD VDDD 3.3 V supplied from Isolation bridge.
TP16 GND_S N/A System ground not directly connected to
CYAT8168X.
TP17 GND_D VSS Sensor board device ground.
Table 4 CYAT8168X sensor board test points (continued)
Test point in
schematics
Silkscreen CYAT8168X signal Notes
Note: These test points are not loaded. Users can use the test pads to measure the signals.

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Hardware
Figure 8 Power switching block diagram
The isolation bridge provides a 3.3-V digital supply (VDDD) and a 5-V analog supply (VDDA) to the CYAT8168X
sensor board.
LEDs are provided on the isolation bridge to indicate power status. LED D3 indicates that the isolation bridge is
powered. LED D4 indicates when power is applied to the CYAT8168X EVK sensor board.
10-pin SWD Programming header J6 is provided to update the firmware on the isolation bridge by using a
MiniProg3 programmer (not included with the kit). Note that the sensor board firmware cannot be upgraded
through J6, instead, the sensor board firmware is upgraded by using the TTHE bootloader function as described
in “Bootloading the EVK” on page 11. In this kit, the isolation bridge is preprogrammed and it is not required to
manually update the firmware.
If the Touch Tuning Bridge FW Upgrade window pops up, verify if the Touch Tuning Bridge version is 1.35 or later.
If not, then click Yes to update the firmware. Click Close when complete. Click No if the version is already 1.35 or
later.
The schematic for the isolation board is shown in the “Isolation bridge board” on page 28.
Hardware design files of the isolation bridge board are available at the following location:
C:\Program Files (x86)\Cypress\CY3290-CYAT8168X AUTOMOTIVE EVK\<version>\Hardware\
Isolation Bridge Board
2.6 Supply current measurements
The CYAT8168X device offers three modes of operation: normal, low-power mode, and deep-sleep mode. To
measure the supply current to the device, the sensor board must be modified. Resistors R120 and R121 on the
sensor board provide a series path to VDDD and VDDA respectively. These resistors can be removed and replaced
with an ammeter to measure the supply current on the device. Note that specifications for the supply current in
various modes of operation are provided in the device datasheet.
PSoC
VUSB
I2C_SDA
Regulator
V_ISO
VCOM_CONN
VAUX_CONN
Isolator
VUSB VCOM_CONN
I2C_SDA
I2C_SCL
I2C_SDA_ISO
I2C_SCL_ISO
16-Pin
Connector
VCOM_CONN
I2C_SDA_ISO
I2C_SCL_ISO
VAUX_CONN
VUSB
USB Mini-B
VMUSB
USB Micro-B
DPDT
V_ISO
V_ISO is supplied
either through VUSB
or VMUSB. VMUSB
generates isolated
power supply or a
different power
supply than bridge.
I2C_SCL

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Kit operation
3 Kit operation
This chapter explains the steps to evaluate the CYAT8168X EVK with TTHE and also to bootload the EVK. You must
complete the installation procedure explained in “Installation” on page 5 before proceeding.
The TTHE software has multiple features and capabilities, such as collecting statistics on sensor data, changing
operating modes, or viewing touch events. Details on the various features are available in the TTHE menu bar
under Help > Contents.
3.1 Evaluating the EVK with TTHE
1. Launch the TTHE from the “Cypress” folder under the “Windows Start Menu”.
2. Connect the CYAT8168X EVK to your computer through a USB cable connected to the PC port on the kit.
3. Ensure SW1 is towards the PC connector as shown in Figure 3.
4. Click on Open Project and navigate to the following directory on your computer and select
TSG6_XL_GC6_CYAT81688-100AS77_EVK.config:
C:\Program Files (x86)\Cypress\CY3290-CYAT8168X AUTOMOTIVE EVK\
<version>\TTHE Config Files\TSG6_XL_GC6_CYAT81688-100AS77_EVK
Note: The project TSG6_XL_GC6_CYAT81688-100AS77_EVK in the install directory is read-only. User is
requested to create a local copy by selecting the “Save Project As” option from the File menu.
This starts the project and the screen will have the Touch Display window. You can add other windows
(Configurable Parameters [Flash/EEPROM] and Touch Display Settings) to know the parameter values set in the
project.
• To add the Configurable Parameters [Flash/EEPROM] window,
go to View > Tool Windows > Configurable Parameters [Flash/EEPROM].
• To add Touch Display Settings window, go to View > Tool Windows > Touch Display Settings.
You can place these windows at left, right, top, or bottom positions of the screen by dragging the windows with
a left click of the mouse. Figure 9 shows windows positioned on both sides of the screen (highlighted) and a
window with two tabs at the bottom.
Figure 9 Starting CYAT8168X EVK project in TTHE

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Kit operation
5. Click on the Connect icon to power the EVK board.
6. This icon should change to after power is applied. The Bridge Status in the status bar in the bottom of the
TTHE window should now show “Connected”. The Vcom and Vaux display around 5 V. These values show the
voltage on the PC side of the bridge, not the DUT side. The PC side cannot measure the DUT side voltage.
7. If you are using the TTHE for the first time, click on Tools > Options in the menu bar. This opens a new Options
window, which looks similar to the following image.
Figure 10 Options window in TTHE
8. Select the Communication Interface tab on the left. Select I2C, as shown in Figure 10, and make sure that
the I2C Clock is selected to 400K and the I2C pins are set to the option Pin 6, 8. Click OK. This step ensures that
the I2C pins on the isolation bridge are routed correctly to the I2C pins on the CYAT8168X EVK.
Note: These settings control the output of the isolation bridge, not the connection between the isolation
bridge MCU and 16-pin connector. The connection between the isolation bridge chip and the 16-pin
connector is set with zero-ohm resistors.
9. Click the Run icon. The TTHE starts reading the contents of the flash. Its progress is displayed in a pop-up
window. Click the Close button when complete.
Figure 11 Status bar progress

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Kit operation
10. New window may open before the progress bar displays the message reading of flash contents are complete.
TTHE compares the values in its Configurable parameters window with the corresponding values in flash. If
there is a mismatch, it asks if you want to continue with the values stored in the flash or want to update the
flash with the values that are stored in its configurable parameters window.
The window in Figure 12 does not appear if the values stored in the device’s flash are the same as the values
in the TTHE configurable registers window. The Sync All From Project procedure will work only if the FW
version is same. For a different FW version, user must Bootload to resolve the difference.
Figure 12 Sync All From Project window
11. If the pop-up window shown in Figure 12 appears, click on Sync All From Project; then, click Apply. This
ensures that the firmware on the flash is in accordance with the TTHE’s
TSG6_XL_GC6_CYAT81688-100AS77_EVK project. When you click Apply, TTHE starts writing the contents to
the flash and its progress is shown in the pop-up window. Click the Close button when complete.
12. The steps to set up the TTHE to communicate with the CYAT8168X EVK are now complete. Place a finger on
the panel and see it move on the screen, as shown in Figure 13. Note that there are five fingers placed on the
panel. It reports up to ten fingers.

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Kit operation
Figure 13 TTHE showing fingers placed on panel
13. CYAT8168X includes support for finger touch with and without gloves. This is handled by the signal threshold
tuning parameters, which are configurable in TTHE. TTHE will report touches as shown in Figure 13 for fingers
(filled circle), whereas gloves are represented by a hatch-filled circle. Each finger placed on the panel is
represented with a different color on the TTHE. Next to each finger, the finger ID, X-coordinate, Y-coordinate,
the Z value (pressure of the touch reported), and Finger Orientation (Major, Minor and Angle) are displayed in
TTHE.
14. To enable Line-Drawing mode, select Line Drawing from the drop-down menu shown in Figure 14.
Figure 14 Line drawing mode
15. To view actual sensor data, select Heat Map in the drop-down menu. In the Touch Display Settings window,
under the Data tab, select Data Type value to DiffCounts. Your window should look similar to Figure 15.

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Kit operation
Figure 15 Heat map mode
16. Select Touch Reporting in the Display Mode drop down menu as shown in Figure 16.
Figure 16 Display Mode - Touch Reporting Selection
17. To view Glove Touch performance, select View > Tool Windows > Data Monitor. Position the Data Monitor
panel in the left lower panel as shown in Figure 17.
18. Click the green start button in Data Monitor toolbar.
19. Select View > Tool Windows > Event History. Position the Event History panel at the bottom, as shown in
Figure 17.
20. Click the green start button in Event History toolbar.
21. Now place a Gloved finger (< 5 mm) on the panel and see it move on the screen and Glove Touch is reported
in Data Monitor and Event History panels.