Semtech SX8634 User manual

ADVANCED COMMUNICATIONS & SENSING
Rev 0.9 – September 2010 1 www.semtech.com
User’s Guide
SX8634/35/44/45 Evaluation Kit
SX8634/35/44/45 Evaluation Kit
User's Guide

ADVANCED COMMUNICATIONS & SENSING
Rev 0.9 – September 2010 2 www.semtech.com
User’s Guide
SX8634/35/44/45 Evaluation Kit
Table of Contents
1Introduction..............................................................................................................................................6
2Getting Started.........................................................................................................................................8
2.1 Kit Contents...............................................................................................................................................8
2.2 Installation/Quick Start...............................................................................................................................9
2.3 GUI tooltips and Help...............................................................................................................................12
3Hardware Description............................................................................................................................13
3.1 Overview .................................................................................................................................................13
3.1.1 USB Connector (#1).................................................................................................................................. 14
3.1.2 VREG (#2)................................................................................................................................................ 14
3.1.3 EEPROM (#3)........................................................................................................................................... 14
3.1.4 ON/OFF switch (#4).................................................................................................................................. 14
3.1.5 Test Switch (#5)........................................................................................................................................ 14
3.1.6 Power Indication LED (#6) ........................................................................................................................ 14
3.1.7 FT2232D (#7)........................................................................................................................................... 14
3.1.8 Stand-alone Jumpers (#8)......................................................................................................................... 14
3.1.9 Header (#9) .............................................................................................................................................. 15
3.1.10 SX8634, SX8635, SX8644, SX8645 (#10) ............................................................................................15
3.1.11 LEDs on GPIO[7..0] (#11)..................................................................................................................... 15
3.1.12 Touch Sensors (#12)............................................................................................................................ 15
3.2 Default EVK hardware settings.................................................................................................................15
4Guided Tour of the GUI/EVK..................................................................................................................16
4.1 Introduction..............................................................................................................................................16
4.2 Active/Doze/Sleep Mode/Wake-up...........................................................................................................16
4.3 LED fading on GPO pins..........................................................................................................................16
4.4 LED mapping on GPO pins......................................................................................................................18
4.5 Sensors for buttons, slider or wheel .........................................................................................................18
4.6 Monitor mode...........................................................................................................................................20
4.7 Sensitivity................................................................................................................................................22
5GUI Description......................................................................................................................................24
5.1 GUI Overview..........................................................................................................................................24
5.2 File Menu.................................................................................................................................................25
5.2.1 Connect/Disconnect.................................................................................................................................. 25
5.2.2 Open SPM................................................................................................................................................ 25
5.2.3 Save SPM ................................................................................................................................................ 26
5.2.4 Save SPM As ........................................................................................................................................... 26
5.2.5 Exit........................................................................................................................................................... 26
5.3 Action Menu.............................................................................................................................................26
5.3.1 Refresh..................................................................................................................................................... 26
5.3.2 Compensate offset.................................................................................................................................... 26
5.3.3 Operating mode........................................................................................................................................ 27
5.3.4 NVM burn................................................................................................................................................. 27
5.4 Help Menu...............................................................................................................................................28
5.4.1 Overview .................................................................................................................................................. 28
5.4.2 Help.......................................................................................................................................................... 28
5.4.3 User’s Guide............................................................................................................................................. 28
5.4.4 About SX863x/4x Evaluation Kit................................................................................................................ 28
5.5 Toolbar....................................................................................................................................................29
5.6 Statusbar.................................................................................................................................................30
5.7 Sensor Status..........................................................................................................................................31
5.8 GUI tabs..................................................................................................................................................34
5.8.1 General tab............................................................................................................................................... 34
5.8.2 Cap Sensors tab....................................................................................................................................... 35
5.8.3 Buttons tab ............................................................................................................................................... 39

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5.8.4 Slider/Wheel tab ....................................................................................................................................... 40
5.8.5 Mapping tab.............................................................................................................................................. 41
5.8.6 GPIO tab .................................................................................................................................................. 42
5.8.7 SPM/I2C tab............................................................................................................................................. 43
6Schematics.............................................................................................................................................45
7Layout ....................................................................................................................................................53
8References.............................................................................................................................................61

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Table of Figures
Figure 1: Typical Application.................................................................................................................................... 6
Figure 2: EVK Contents...........................................................................................................................................8
Figure 3: EVK startup.............................................................................................................................................. 9
Figure 4: SX864x EVK LEDs and sensors ............................................................................................................... 9
Figure 5: SX863x EVK LEDs and sensors ............................................................................................................. 10
Figure 6: EVK GUI window.................................................................................................................................... 10
Figure 7: button BT0 touched (SX864x) or proximity detected (Sx863x)................................................................. 11
Figure 8: tooltip example ....................................................................................................................................... 12
Figure 9: SX8644EVK Board Picture ..................................................................................................................... 13
Figure 10: SX8645EVK Board Picture ................................................................................................................... 13
Figure 11: Jumpers ............................................................................................................................................... 14
Figure 12: Header ................................................................................................................................................. 15
Figure 13: Operating Modes.................................................................................................................................. 16
Figure 14: GPIO tab modified (i)............................................................................................................................ 17
Figure 15: GPIO tab modified (ii) ........................................................................................................................... 17
Figure 16: Mapping tab modified............................................................................................................................ 18
Figure 17: Cap Sensors modified........................................................................................................................... 19
Figure 18: Cap Sensors tab................................................................................................................................... 20
Figure 19: Monitor tab ........................................................................................................................................... 21
Figure 20: Select thresholds, hysteresis................................................................................................................. 21
Figure 21: two successive touches on button 0...................................................................................................... 22
Figure 22: sensitivity (5) of button 0....................................................................................................................... 22
Figure 23: sensitivity (0) of button 0, sensitivity (1) of button 0............................................................. 23
Figure 24: SX8634/44 GUI Overview..................................................................................................................... 24
Figure 25: SX8635/45 GUI Overview..................................................................................................................... 24
Figure 26: File Menu ............................................................................................................................................. 25
Figure 27: SPM File Example (begin) .................................................................................................................... 25
Figure 28: SPM File Example (end)....................................................................................................................... 26
Figure 29: Action Menu ......................................................................................................................................... 26
Figure 30: Operating Mode.................................................................................................................................... 27
Figure 31: Confirm NVM burn................................................................................................................................27
Figure 32: Confirmation NVM is burned................................................................................................................. 27
Figure 33: GUI Help Menu..................................................................................................................................... 28
Figure 34: About window....................................................................................................................................... 28
Figure 35: Toolbar................................................................................................................................................. 29
Figure 36: I2C address.......................................................................................................................................... 29
Figure 37: Statusbar.............................................................................................................................................. 30
Figure 38: Statusbar with error message ............................................................................................................... 30
Figure 39: Statusbar with SPM file......................................................................................................................... 30
Figure 40: Sensor status for SX8634/44EVK and SX8634/45EVK.......................................................................... 31
Figure 41: Example BT0 and BT2 touched ............................................................................................................ 32
Figure 42: Example slider touched......................................................................................................................... 32
Figure 43: Example slider move high and move low............................................................................................... 33
Figure 44: Example wheel touched........................................................................................................................ 33
Figure 45: Example wheel move counter clock wise and move clock wise ............................................................. 33
Figure 46: general tab ........................................................................................................................................... 34
Figure 47: cap sensors tab.................................................................................................................................... 35
Figure 48:monitor enabled..................................................................................................................................... 35
Figure 49:monitor window...................................................................................................................................... 36
Figure 50:show/hide monitor signals...................................................................................................................... 36
Figure 51:example: super pose thresholds of button 0........................................................................................... 37
Figure 52:graph pop up window............................................................................................................................. 38

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Figure 53: buttons tab............................................................................................................................................ 39
Figure 54 slider or wheel tab.................................................................................................................................. 40
Figure 55 mapping tab........................................................................................................................................... 41
Figure 56 GPIO tab............................................................................................................................................... 42
Figure 57 SPM/I2C tab.......................................................................................................................................... 43
Figure 58 SPM expanding General........................................................................................................................ 44
Figure 59: SX8644EVK schematic page 1/2 .......................................................................................................... 45
Figure 60: SX8644EVK schematic page 2/2 .......................................................................................................... 46
Figure 61: SX8645EVK schematic page 1/2 .......................................................................................................... 47
Figure 62: SX8645EVK schematic page 2/2 .......................................................................................................... 48
Figure 63: SX8634EVK schematic page 1/2 .......................................................................................................... 49
Figure 64: SX8634EVK schematic page 2/2 .......................................................................................................... 50
Figure 65: SX8635EVK schematic page 1/2 .......................................................................................................... 51
Figure 66: SX8635EVK schematic page 2/2 .......................................................................................................... 52
Figure 67: SX8644EVK top layer........................................................................................................................... 53
Figure 68: SX8644EVK mid layer 1 ....................................................................................................................... 53
Figure 69: SX8644EVK mid layer 2 ....................................................................................................................... 54
Figure 70: SX8644EVK bottom layer ..................................................................................................................... 54
Figure 71: SX8645EVK top layer........................................................................................................................... 55
Figure 72: SX8645EVK mid layer 1 ....................................................................................................................... 55
Figure 73: SX8645EVK mid layer 2 ....................................................................................................................... 56
Figure 74: SX8645EVK bottom layer ..................................................................................................................... 56
Figure 67: SX8634EVK top layer........................................................................................................................... 57
Figure 72: SX8634EVK mid layer 1 ....................................................................................................................... 57
Figure 73: SX8634EVK mid layer 2 ....................................................................................................................... 58
Figure 74: SX8634EVK bottom layer ..................................................................................................................... 58
Figure 67: SX8635EVK top layer........................................................................................................................... 59
Figure 72: SX8635EVK mid layer 1 ....................................................................................................................... 59
Figure 73: SX8635EVK mid layer 2 ....................................................................................................................... 60
Figure 74: SX8635EVK bottom layer ..................................................................................................................... 60
Figure 75: SX8634/44EVK, SX8635/45EVK stacked layer information................................................................... 60

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1 Introduction
This document describes the evaluation kits of the:
- SX8634 (proximity, buttons and slider)
- SX8635 (proximity, buttons and wheel)
- SX8644 (buttons and slider)
- SX8645 (buttons and wheel)
In this user guide the term EVK refers to the SX8634EVK, SX8635EVK SX8644EVK and SX8645EVK
The SX863x and SX864x family (see references [1] to [13]), is an ultra low power, fully integrated 12 (or 8) -channel
solution for capacitive touch-buttons, slider and wheel and proximity applications with enhanced LED drivers. The
SX863x/4x family features dedicated capacitive sense inputs (that requires no external components) in addition to 8
general purpose I/O ports (GPIO). Each GPIO is typically configured as LED driver with independent PWM source
for enhanced lighting control such as intensity and fading. SX863x offers additionally proximity detection.
proximity
SX8634 SX8635
SX8644 SX8645
Figure 1: Typical Application

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SX863x and SX864x main features include:
Proximity Sensing (for SX863x Family)
Complete 12 Sensors Capacitive Touch Controller for Buttons and Slider
Pre-configured for 6 Buttons and a Slider (SX8644), Wheel (SX8645)
8 LED Drivers with Individual Intensity, Fading Control and Autolightening Mode
256 steps PWM Linear and Logarithmic control
High Resolution Capacitive Sensing
Up to 100pF of Offset Capacitance Compensation at Full Sensitivity
Capable of Sensing through Overlay Materials up to 5mm thick
Extremely Low Power Optimized for Portable Application
8uA (typ) in Sleep Mode
80uA (typ) in Doze Mode (Scanning Period 195ms)
260uA (typ) in Active Mode (Scanning Period 30ms)
Programmable Scanning Period from 15ms to 1500ms
Auto Offset Compensation
Eliminates False Triggers due to Environmental Factors (Temperature, Humidity)
Initiated on Power-up and Configurable Intervals
Multi-Time In-Field Programmable Firmware Parameters for Ultimate Flexibility
On-chip user programmable memory for fast, self contained start-up
"Smart" Wake-up Sequence for Easy Activation from Doze
No External Components per Sensor Input
Internal Clock Requires No External Components
Differential Sensor Sampling for Reduced EMI
400 KHz Fast-Mode I²C Interface with Interrupt

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2 Getting Started
2.1 Kit Contents
As illustrated in the figure below, the Evaluation kit is composed of:
¾SX8634EVK, SX8635EVK , SX8644EVK, SX8645EVK board with 2mm acrylic glass overlay.
¾CDROM including all necessary PC software and documentation (requires min. Windows XP)
¾Mini USB cable to connect the SX8634EVK, SX8635EVK, SX8644EVK, SX8645EVK board to the PC
SX8644EVK SX8645EVK
SX8634EVK SX8635EVK
Figure 2: EVK Contents

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2.2 Installation/Quick Start
1- Put the CDROM in your computer. If the installation does not start automatically, launch
“SX863xSX864xEvaluationKitSetup.exe” manually.
2- Follow installation guidelines until the process is completed. Please note that .NET Framework 3.5 and the
FTDI USB driver will be automatically downloaded/installed if not detected on your computer.
3- For SX864x only: Assure the switch #5 is always in the left position.
4- Set the ON/OFF switch (#4) to OFF (left position).
5- Connect the EVK board to the PC with the mini USB cable to connecter #1.
Figure 3: EVK startup
6- The PC will recognize the EVK.
7- Set the ON/OFF switch (#4) to ON (right position).
8- The red LED (#6) will light up
The EVK is now read to be used in stand alone demo mode (without GUI).
Touching the buttons BT0 to BT5 (#12) will enable the corresponding green LEDs (#11), D0 to D5.
Releasing the buttons will turn off the LEDs.
Figure 4: SX864x EVK LEDs and sensors
6
5
1
4
12
11
12
11

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Figure 5: SX863x EVK LEDs and sensors
Moving a finger on the slider or wheel (#12) will enable the green LEDs (#11), D6 and D7 depending on the
direction of the finger.
For the SX863x the orange LED (d0) will show proximity as soon as the user approaches the EVK.
For more detailed evaluation and changing the default configuration of the EVK the GUI needs to be started.
9- Launch “Sx863xSX864xEVK” from PC Start menu.
10- The EVK will be connected automatically and the following window will appear.
(In case the auto connect did not succeed: Click on “Disconnect/Connect” button in toolbar or select
‘Connect’ in File menu)
Figure 6: EVK GUI window
The product is shown in the left bottom corner of the GUI.
11- a) SX864x: Touch with your finger a button (e.g. BT0) on the EVK and the GUI shows BT0 is touched
(white).
b) Sx863x: Approach with your finger the EVK and the Gui shows proximity detection (BT0 touched, white)
11 12 11 12

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Figure 7: button BT0 touched (SX864x) or proximity detected (Sx863x)
The EVK and GUI are operational.

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2.3 GUI tooltips and Help
All GUI buttons, LEDs, scroll bars, icons have tooltips which show briefly the functionality. The tooltips can be
activated by the user by moving the mouse over the desired area (see example I2C address selection).
Figure 8: tooltip example

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3 Hardware Description
The EVK boards are described in this chapter. Please refer to the schematics and layout provided at the end of the
document for more details about the exact hardware implementation.
3.1 Overview
Figure 9: SX8644EVK Board Picture
Figure 10: SX8645EVK Board Picture
10 12
11
1
4
5
3
7 8 9
2 6
10 12
11
1
4
5
3
78 9
2 6

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3.1.1 USB Connector (#1)
The USB connector allows the EVK to be connected to a PC from which it will get its power and
configuration/control commands via the dedicated software.
3.1.2 VREG (#2)
VREG is fixed to the typical operating voltage of 3.3V using the Semtech Sc153 voltage regulator, ensuring correct
I2C communication between the SX863x/4x and the FT2232D.
3.1.3 EEPROM (#3)
FT2232D is associated to an EEPROM which keeps the FTDI chip’s parameters when power is turned off. The
EEPROM is used to customize USB device description.
3.1.4 ON/OFF switch (#4)
The ON/OFF switch turns ON (right position) or OFF (left position) the supply for the SX863x/4x and at the same
time the red power indication LED (#6).
3.1.5 Test Switch (#5)
Only applicable for SX864x:
This switch is for Semtech internal use and needs to be always in the left position.
The EVK will not operate if this switch is in the wrong position.
3.1.6 Power Indication LED (#6)
The read LED indicates if the SX863x/4x are turned ON or OFF, according the position of switch (#4).
3.1.7 FT2232D (#7)
The FT2232D from FTDI will be used as a USB to I2C bridge between the PC and the SX863x/4x; moreover it will
also monitor and control RESETB and INTB signals (similar to what a host would do in a final application).
The USB bridge is supplied directly over the USB cable.
3.1.8 Stand-alone Jumpers (#8)
These six jumpers are connecting the FT2232D bridge to the SX863x/4x.
Their purpose is, as their name suggests, being able to disconnect the SX863x/4x from the rest of the circuitry to
access it externally (with an external host, sharing another I2C bus, etc.).
Figure 11: Jumpers

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3.1.9 Header (#9)
The header, 2x 10 pins allows the user connect to the different signals on the board e.g. for monitoring purposes.
Figure 12: Header
3.1.10 SX8634, SX8635, SX8644, SX8645 (#10)
The Semtech Touch controller product.
3.1.11 LEDs on GPIO[7..0] (#11)
Eight green LEDs (D0..D7) are connected to the eight GPIOs of the SX8644 or SX8645 for visual feedback.
Seven green LEDs (D1..D7) and one orange LED (D0, proximity) are connected to the eight GPIOs of the SX8634
or SX8635 for visual feedback.
3.1.12 Touch Sensors (#12)
Different size touch buttons and slider, wheel are connected to the SX863x/4x.
The sensor area is covered by 2 mm thick transparent, acrylic glass.
3.2 Default EVK hardware settings.
Default settings of jumpers and switches:
- All jumpers need to be mounted.
- The ON/OFF switch (#4) can be in ON (right position) or OFF (left position).
- SX864x: The test switch (#5) needs to be in the left position.

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4 Guided Tour of the GUI/EVK
4.1 Introduction
The paragraphs in this chapter allow the user to get to know the basics of the EVK and the SX863x/4x and to get
the user acquainted with the GUI and the EVK and the way to use them.
The more technical details and functioning are described in following chapters and in the product datasheets
(references [1] to [13]).
The steps in this chapter are straight forward and do not require a very detailed knowledge of the SX863x/4x neither
of the EVK.
4.2 Active/Doze/Sleep Mode/Wake-up
Directly after a power up of the EVK the SX863x/4x will enter Active mode and sensor pins will be sensed every
30ms.
The user can change the operation mode by clicking on the icons.
The actual operation mode is then highlighted as shown below.
active mode doze mode sleep mode
Figure 13: Operating Modes
The sensor pins are sensed every 195 ms in Doze Mode.
There are 2 ways from Doze mode to Active mode.
1) Use the Operating mode icon Active
2) Touching the button BT0 for at least 195ms. After the release of BT0 the Active mode is entered automatically.
This is the so-called automatic wakeup. In case other buttons are touched nothing happens and Doze mode is
maintained.
4.3 LED fading on GPO pins
Touching BT0 will enable LED D0 on the EVK.
When BT0 is released the LED will remain on for some time and then go OFF slowly.
It is easy to change the LED behavior by the following steps.
- select the GPIO tab

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-
Figure 14: GPIO tab modified (i)
Change the Dec time (default 2ms) and OFF delay (default 1.0s) to OFF.
Each modification on this tab is immediately written to the EVK.
After this is done the LED will turn off directly after a release.
Figure 15: GPIO tab modified (ii)
Change the OFF intensity (default 0) to 64. The LED D0 will be enabled at very low brightness in the OFF state.

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4.4 LED mapping on GPO pins
LED D0 on the EVK is mapped to button BT0.
It is easy to map LED D0 to another button and e.g. swap with button1
Figure 16: Mapping tab modified
In the example above LED D0 is mapped to Button 1 (default is button 0) and LED D1 is mapped to button 0 (default
is button 1).
4.5 Sensors for buttons, slider or wheel
The SX8634/44 and SX8635/45 start up with six buttons and six sensors in the slider or wheel.
This can be easily changed in the Cap Sensor tab.
The configuration below shows a example which uses a slider with 5 sensors (6 per default), the buttons 0, 2, and 4
were turned off to save power consumption and button 6 was enabled.

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Figure 17: Cap Sensors modified
The GUI shows at the right side the modified users configuration.
Green icons are enabled sensors and the grey icons are disabled sensors.

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4.6 Monitor mode
Touching a sensor does not always mean the EVK will consider this as a touch.
It might e.g. be that the touch is only partly on the sensor area or maybe the overlay material is replaced by
something thicker.
The EVK parameters are set such that sensor area, overlay material and thickness are operational.
In case the user changes the hardware or just needs to observe raw signals the GUI can be set in monitor mode.
Follow the next steps:
-select the Cap Sensors tab
Figure 18: Cap Sensors tab
- then push the Start button at the bottom.
- a stop button and the monitor icon will appear.
- click on the monitor icon.
- a window appears with the sensor data.