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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User’s Guide
SX8634/35/44/45 Evaluation Kit
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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User’s Guide
SX8634/35/44/45 Evaluation Kit
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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SX8634/35/44/45 Evaluation Kit
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

ADVANCED COMMUNICATIONS & SENSING
Rev 0.9 – September 2010 6 www.semtech.com
User’s Guide
SX8634/35/44/45 Evaluation Kit
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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User’s Guide
SX8634/35/44/45 Evaluation Kit
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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User’s Guide
SX8634/35/44/45 Evaluation Kit
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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SX8634/35/44/45 Evaluation Kit
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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SX8634/35/44/45 Evaluation Kit
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