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SX8652 Datasheet Preview

SX8652 Datasheet

15kV ESD Low Power 4-Wire / 5-Wire Resistive Touchscreen Controller

No Preview Available !

SX8652
15kV ESD Low Power 4-Wire / 5-Wire Resistive
Touchscreen Controller with SPI Interface
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
-----4
GENERAL DESCRIPTION
KEY PRODUCT FEATURES
The SX8652 is a very low power, high reliability controller
for 4-wire and 5-wire resistive touch screens used in PDAs,
portable instruments and point-of-sales terminal
applications. 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 SX8652 is
controlled by a high speed SPI™ serial interface.
The SX8652 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
DSC, DVR, Cell Phones
PDA, Pagers
Point-of-Sales Terminals
Touch-Screen Monitors
ORDERING INFORMATION
Extremely Low Power Consumption: 23uA@1.8V 8kSPS
Superior On-chip ESD Protection
±15kV HBM (X+,X-,Y+,Y-)
±2kV CDM
±25kV Air Gap Discharge
±15kV Contact Discharge
±300V MM
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
Low Noise Ratiometric Conversion
Precision, 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°C to +85°C operation
Part Number
SX8652ICSTRT1
SX8652IWLTRT1
1. 3000 Units / reel
Package (Dimension in mm) Marking
12 - Ball WLCSP (1.5x2.0) FG97
14 - Lead DFN (4.0x 3.0)
FG97
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
To the
touch
screen
Revision V1.7/October 2010
©2010 Semtech Corp.
VDD
AUX/W IPER
X+/BR
Y+/TR
X-/TL
Y-/BL
Touch
Screen
Interface
Vref
C o n tro l
SX8652
VDD
N IR Q
POR
OSC
ref+
in ADC out
ref-
SPI
D ig ita l
Filter
NRST (D FN only)
NCS
SCLK
DOUT
D IN
To the
Host
Page 1
GND
www.semtech.com




Semtech

SX8652 Datasheet Preview

SX8652 Datasheet

15kV ESD Low Power 4-Wire / 5-Wire Resistive Touchscreen Controller

No Preview Available !

SX8652
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
5. 5-wire Touch Screen Detailed Description ............................................................................................................ 14
5.1. Touch Screen Operation................................................................................................................................ 14
5.2. Coordinates Measurement............................................................................................................................. 14
5.3. Pen Detection ................................................................................................................................................ 14
6. Data Processing .................................................................................................................................................... 15
7. Power-Up, Reset ................................................................................................................................................... 15
8. Modes of Operation ............................................................................................................................................... 15
8.1. MANual Mode ................................................................................................................................................ 16
8.2. AUTOmatic mode .......................................................................................................................................... 16
8.3. PENDET Mode .............................................................................................................................................. 17
8.4. PENTRIG Mode ............................................................................................................................................. 17
9. Host Interface ........................................................................................................................................................ 19
9.1. SPI Read/Write Registers .............................................................................................................................. 19
9.2. SPI Reading Channel Data............................................................................................................................ 19
9.3. SPI Host Commands ..................................................................................................................................... 20
9.4. SPI implementation and multiple Read/Write ................................................................................................ 20
9.5. Invalid Qualified Data..................................................................................................................................... 21
Revision V1.7/October 2010
©2010 Semtech Corp.
Page 2
www.semtech.com


Part Number SX8652
Description 15kV ESD Low Power 4-Wire / 5-Wire Resistive Touchscreen Controller
Maker Semtech
Total Page 29 Pages
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