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Semtech

SX8653 Datasheet Preview

SX8653 Datasheet

Multitouch 15kV ESD protection 4-Wire / 5-Wire Resistive Touchscreen Controller

No Preview Available !

SX8653
Multitouch 15kV ESD protection 4-Wire / 5-Wire
Resistive Touchscreen Controller with SPI Interface
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
-----4
GENERAL DESCRIPTION
KEY PRODUCT FEATURES
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.
APPLICATIONS
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
DSC, DVR, Cell Phones
PDA, Pagers
Point-of-Sales Terminals
Touch-Screen Monitors
ORDERING INFORMATION
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°C to +85°C operation
Part Number
SX8653ICSTRT1
SX8653IWLTRT1
1. 3000 Units / reel
Package (Dimension in mm) Marking
12 - Ball WLCSP (1.5x2.0) NB2A
14 - Lead DFN (4.0x 3.0) NB2A
VDD
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
SX8653
VDD
Control
NIRQ
To the
touch
screen
AUX/W IPER
X+/BR
Y+/TR
X-/TL
Y-/BL
Touch
Screen
Interface
Vref
POR
OSC
ref+
in ADC out
ref-
SPI
D igital
Filter
NRST (DFN only)
NCS
SCLK
DOUT
DIN
To the
Host
Revision V1.0/October 2010
©2010 Semtech Corp.
Page 1
GND
www.semtech.com




Semtech

SX8653 Datasheet Preview

SX8653 Datasheet

Multitouch 15kV ESD protection 4-Wire / 5-Wire Resistive Touchscreen Controller

No Preview Available !

SX8653
ADVANCED COMMUNICATIONS & SENSING
Table of contents
Section
DATASHEET
Page
1. General Description ................................................................................................................................................. 4
1.1. DFN Pinout Diagram and Marking Information (Top View).............................................................................. 4
1.2. WLCSP Pinout Diagram and Marking Information (Top View) ........................................................................ 4
1.3. Pin Description................................................................................................................................................. 5
1.4. Simplified Block Diagram ................................................................................................................................. 5
2. Electrical Characteristics ......................................................................................................................................... 6
2.1. Absolute Maximum Ratings ............................................................................................................................. 6
2.2. Recommended Operating Conditions.............................................................................................................. 6
2.3. Thermal Characteristics ................................................................................................................................... 6
2.4. Electrical Specifications ................................................................................................................................... 7
2.5. Host Interface Specifications ........................................................................................................................... 9
2.6. Host Interface Timing Waveforms.................................................................................................................... 9
3. Functional Description ........................................................................................................................................... 10
3.1. General Introduction ..................................................................................................................................... 10
3.2. Device Interface and ESD protection............................................................................................................. 11
3.2.1. Touchscreen interface............................................................................................................................. 11
3.2.2. Host Interface and Control Pins .............................................................................................................. 11
4. 4-wire Touch Screen Detailed Description ............................................................................................................ 12
4.1. Touch Screen Operation................................................................................................................................ 12
4.2. Coordinates Measurement............................................................................................................................. 12
4.3. Pressure Measurement.................................................................................................................................. 13
4.4. Pen Detection ................................................................................................................................................ 13
4.5. Double touch measurement........................................................................................................................... 14
5. 5-wire Touch Screen Detailed Description ............................................................................................................ 15
5.1. Touch Screen Operation................................................................................................................................ 15
5.2. Coordinates Measurement............................................................................................................................. 15
5.3. Pen Detection ................................................................................................................................................ 15
6. Data Processing .................................................................................................................................................... 16
7. Power-Up, Reset ................................................................................................................................................... 16
8. Modes of Operation ............................................................................................................................................... 16
8.1. MANual Mode ................................................................................................................................................ 17
8.2. AUTOmatic mode .......................................................................................................................................... 17
8.3. PENDET Mode .............................................................................................................................................. 18
8.4. PENTRIG Mode ............................................................................................................................................. 18
9. Host Interface ........................................................................................................................................................ 20
9.1. SPI Read/Write Registers .............................................................................................................................. 20
9.2. SPI Reading Channel Data............................................................................................................................ 20
9.3. SPI implementation and multiple Read/Write ................................................................................................ 21
9.4. Invalid Qualified Data..................................................................................................................................... 22
Revision V1.0/October 2010
©2010 Semtech Corp.
Page 2
www.semtech.com


Part Number SX8653
Description Multitouch 15kV ESD protection 4-Wire / 5-Wire Resistive Touchscreen Controller
Maker Semtech
Total Page 30 Pages
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