SX8653
Multitouch 15kV ESD protection 4-Wire / 5-Wire
Resistive Touchscreen Controller with SPI Interface
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
-----4
GENERAL DESCRIPTION
The SX8653 is a touch controller for 4 or 5 wire resistive
touchscreen. With 4-wire touchscreen, the multitouch
feature enables a completely different user interaction. It
enables detection of 2 fingers on the touchscreen and
several gestures like rotation and pinch/ stretch.
It features a wide input supply range from 1.65V to 3.7V and
low power modes to preserve current when the screen is
unintentionally touched.
To compute touch screen X-Y coordinates and touch
pressure with precision, a low power 12-bit analog-digital
converter is activated with the possibility to enable on-chip
data averaging processing algorithms to reduce host activity
and suppress system noise.
The touch screen controller inputs have been specially
designed to provide robust on-chip ESD protection of up to
±15kV in both HBM and Contact Discharge, and eliminates
the need for external protection devices. The SX8653 is
controlled by a high speed SPI™ serial interface.
The SX8653 is available in a 4.0 mm x 3.0 mm 14-DFN
package and a 1.5 mm x 2.0 mm wafer level chip scale
package (WLCSP) for space conscience applications.
KEY PRODUCT FEATURES
Extremely Low Power Consumption: 23uA@1.8V 8kSPS
Support Multi-touch operation (4-wire)
Superior On-chip ESD Protection
±15kV HBM (X+,X-,Y+,Y-)
±2kV CDM
±25kV Air Gap Discharge
±15kV Contact Discharge
±300V MM
Pin-compatible with SX8652
Single 1.65V to 3.7V Supply/Reference
4-Wire or 5-Wire Resistive Touch Screen Interface
Integrated Preprocessing Block to Reduce Host Loading
and Bus Activity
Four User Programmable Operation Modes provides
Flexibility to address Different Application Needs
Manual, Automatic, Pen Detect, Pen Trigger
Precision, Low Noise, High Speed 12-bit SAR ADC
Operating At 74k SPS
Throughput: 5000 (X-Y) coordinates/second (c/s) with 7-
Sample Averaging
Low Power Shut-Down Mode < 1uA
SPI™ Serial Interface
Touch Pressure Measurement (4-Wire)
Auxiliary Input (4-Wire) For Alternate ADC Input or Start
of Conversion Trigger
Hardware & Software reset
-40° to +85°C operation
C
Marking
NB2A
NB2A
APPLICATIONS
DSC, DVR, Cell Phones
PDA, Pagers
Point-of-Sales Terminals
Touch-Screen Monitors
ORDERING INFORMATION
Part Number
SX8653ICSTRT
1
SX8653IWLTRT
1
1. 3000 Units / reel
VD D
Package
(Dimension in mm)
12 - Ball WLCSP
(1.5x2.0)
14 - Lead DFN
(4.0x 3.0)
Pb-Free, Halogen Free, RoHS/WEEE compliant product
Windows CE 6.0, Linux Driver Support Available
Packages: 14-LD (4.0 mm x 3.0 mm) DFN
12-Ball (1.5 mm x 2.0 mm) WLCSP
S X 8653
C ontrol
N IR Q
VD D
A U X /W IP ER
PO R
N R S T (D FN only)
SPI
Touch
Screen
Interface
Vref
in
ref-
O SC
SC LK
ref+
AD C out
D ig ital
Filter
DOUT
D IN
NCS
X +/BR
Y+/TR
X -/TL
Y-/BL
To the
touch
screen
T o the
H ost
GND
Revision V1.0/October 2010
©2010 Semtech Corp.
Page 1
www.semtech.com
SX8653
ADVANCED COMMUNICATIONS & SENSING
Table of contents
Section
Page
DATASHEET
1.
General Description ................................................................................................................................................. 4
1.1.
1.2.
1.3.
1.4.
DFN Pinout Diagram and Marking Information (Top View).............................................................................. 4
WLCSP Pinout Diagram and Marking Information (Top View) ........................................................................ 4
Pin Description................................................................................................................................................. 5
Simplified Block Diagram ................................................................................................................................. 5
Absolute Maximum Ratings ............................................................................................................................. 6
Recommended Operating Conditions.............................................................................................................. 6
Thermal Characteristics ................................................................................................................................... 6
Electrical Specifications ................................................................................................................................... 7
Host Interface Specifications ........................................................................................................................... 9
Host Interface Timing Waveforms.................................................................................................................... 9
General Introduction ..................................................................................................................................... 10
Device Interface and ESD protection............................................................................................................. 11
Touchscreen interface............................................................................................................................. 11
Host Interface and Control Pins .............................................................................................................. 11
2.
Electrical Characteristics ......................................................................................................................................... 6
2.1.
2.2.
2.3.
2.4.
2.5.
2.6.
3.
Functional Description ........................................................................................................................................... 10
3.1.
3.2.
3.2.1.
3.2.2.
4.
4.1.
4.2.
4.3.
4.4.
4.5.
5.
5.1.
5.2.
5.3.
6.
7.
8.
4-wire Touch Screen Detailed Description ............................................................................................................ 12
Touch Screen Operation................................................................................................................................ 12
Coordinates Measurement............................................................................................................................. 12
Pressure Measurement.................................................................................................................................. 13
Pen Detection ................................................................................................................................................ 13
Double touch measurement........................................................................................................................... 14
Touch Screen Operation................................................................................................................................ 15
Coordinates Measurement............................................................................................................................. 15
Pen Detection ................................................................................................................................................ 15
5-wire Touch Screen Detailed Description ............................................................................................................ 15
Data Processing .................................................................................................................................................... 16
Power-Up, Reset ................................................................................................................................................... 16
Modes of Operation ............................................................................................................................................... 16
8.1.
8.2.
8.3.
8.4.
MANual Mode ................................................................................................................................................ 17
AUTOmatic mode .......................................................................................................................................... 17
PENDET Mode .............................................................................................................................................. 18
PENTRIG Mode ............................................................................................................................................. 18
SPI Read/Write Registers .............................................................................................................................. 20
SPI Reading Channel Data............................................................................................................................ 20
SPI implementation and multiple Read/Write ................................................................................................ 21
Invalid Qualified Data..................................................................................................................................... 22
Page 2
9.
Host Interface ........................................................................................................................................................ 20
9.1.
9.2.
9.3.
9.4.
Revision V1.0/October 2010
©2010 Semtech Corp.
www.semtech.com
SX8653
ADVANCED COMMUNICATIONS & SENSING
Table of contents
Section
Page
DATASHEET
9.5.
9.6.
10.
Register Map................................................................................................................................................. 23
SX8653 register ............................................................................................................................................ 24
Application Information ......................................................................................................................................... 25
10.1. Acquisition Setup ........................................................................................................................................... 25
10.2. Channel Selection.......................................................................................................................................... 25
10.3. Noise Reduction............................................................................................................................................. 25
10.3.1. POWDLY................................................................................................................................................. 25
10.3.2. SETDLY .................................................................................................................................................. 26
10.4. AUX Input - 4-wire touchscreen only ............................................................................................................. 26
10.5. Interrupt Generation....................................................................................................................................... 26
10.6. Coordinate Throughput Rate ......................................................................................................................... 26
10.6.1. SPI Communication Time ....................................................................................................................... 26
10.6.2. Conversion Time ..................................................................................................................................... 27
10.7. ESD event...................................................................................................................................................... 27
11.
Multi-Touch Gestures with 4-wire touchscreen...................................................................................................... 28
11.1. Zoom Gesture ................................................................................................................................................ 28
11.2. Rotate Gesture............................................................................................................................................... 28
12.
Packaging Information ........................................................................................................................................... 29
12.1. DFN Package................................................................................................................................................. 29
12.2. WLCSP Package ........................................................................................................................................... 30
Revision V1.0/October 2010
©2010 Semtech Corp.
Page 3
www.semtech.com
SX8653
Multitouch 15kV ESD protection 4-Wire / 5-Wire
Resistive Touchscreen Controller with SPI Interface
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
1. General Description
1.1. DFN Pinout Diagram and Marking Information (Top View)
AUX/
WIPER
VDD
X+/BR
Y+/TR
X-/TL
Y-/BL
GND
1
2
3
4
5
6
7
15
14
13
12
11
10
9
8
(NC)
NRST
NCS
NIRQ
DOUT
DIN
SCLK
PIN
1
IDENTIFIER
Figure 1. SX8653 DFN Top View, Pad on Bottom Side
YYWW: date code
XXXXX: Lot Number
NB2A
YYWW
XXXXX
1.2. WLCSP Pinout Diagram and Marking Information (Top View)
X+/BR
Y+/TR
X-/TL
Y-/BL
3
VDD
NCS
DIN
GND
2
AUX/WIPER
#
NIRQ
DOUT
SCLK
NB2A
YYWW
XXXXXX
BALL A1 IDENTIFIER
1
A
B
C
D
Figure 2. SX8653 WLCSP Top View, Solder Bumps on Bottom Side
YYWW: date code
XXXXX: Lot Number
Revision V1.0/October 2010
©2010 Semtech Corp.
Page 4
www.semtech.com
SX8653
Multitouch 15kV ESD protection 4-Wire / 5-Wire
Resistive Touchscreen Controller with SPI Interface
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
1.3. Pin Description
Pin Number
#
DFN WLCSP
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
A1
A2
A3
B3
C3
D3
D2
D1
C2
C1
B1
B2
-
-
-
AUX/WIPER Digital Input /
Analog Input
VDD
X+/BR
Y+/TR
X-/TL
Y-/BL
GND
SCLK
DIN
DOUT
NIRQ
NCS
NRST
(NC)
GND
Power input
Power Input
Analog IO
Analog IO
Analog IO
Analog IO
Ground
Digital Input
Digital Output
Digital Output
Conversion Synchronization (4-wire) or
Analog Auxiliary Input (4-wire) / Wiper Input (5-wire)
Input power supply, connect to a 0.1uF capacitor to GND
X+ Right electrode (4-wire) / Bottom Right (5-wire) channel
Y+ Top electrode (4-wire) /Top Right (5-wire) channel
X- Left electrode (4-wire) /Top Left (5-wire) channel
Y- Bottom electrode (4-wire) /Bottom Left (5-wire) channel
Ground
SPI Serial Clock Input
SPI Serial Data Input
SPI Serial Data Output
Name
Type
Description
Digital Output, open drain Interrupt Request Output, Active low, Need external pull-up
Digital Input
Digital Input
SPI Chip Select Input, Active low
DFN package only, Reset Input, Active low, Internal pull-up resistor
Not Connected
Backside Ground
Table 1. Pin description
1.4. Simplified Block Diagram
The SX8653 simplified block diagram is shown in Figure 3.
VDD
Control
NIRQ
AUX/WIPER
POR
NRST (DFN only)
SPI
Touch
Screen
Interface
Vref
OSC
SCLK
ref+
in
ADC out
ref-
Digital
Filter
DOUT
DIN
NCS
X+/BR
Y+/TR
X-/TL
Y-/BL
VDD
SX8653
To the
touch
screen
To the
Host
GND
Figure 3. Simplified block diagram of the SX8653
Revision V1.0/October 2010
©2010 Semtech Corp.
Page 5
www.semtech.com
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