SX8652
15kV ESD Low Power 4-Wire / 5-Wire Resistive
Touchscreen Controller with SPI Interface
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
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KEY PRODUCT FEATURES
GENERAL DESCRIPTION
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.
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 7Sample Averaging
APPLICATIONS
Low Power Shut-Down Mode < 1uA
DSC, DVR, Cell Phones
SPI™ Serial Interface
PDA, Pagers
Touch Pressure Measurement (4-Wire)
Point-of-Sales Terminals
Auxiliary Input (4-Wire) For Alternate ADC Input or Start
of Conversion Trigger
Touch-Screen Monitors
Hardware & Software reset
ORDERING INFORMATION
Part Number
-40° to +85°C operation
C
Package (Dimension in mm)
Pb-Free, Halogen Free, RoHS/WEEE compliant product
Marking
SX8652ICSTRT1
12 - Ball WLCSP (1.5x2.0)
FG97
Windows CE 6.0, Linux Driver Support Available
SX8652IWLTRT1
14 - Lead DFN (4.0x 3.0)
FG97
Packages: 14-LD (4.0 mm x 3.0 mm) DFN
12-Ball (1.5 mm x 2.0 mm) WLCSP
1. 3000 Units / reel
VDD
S X 865 2
VDD
C o ntrol
N IR Q
A U X /W IP E R
N R S T (D FN only)
POR
T o the
touch
screen
SPI
X + /B R
Y + /TR
Touch
S creen
Interface
S C LK
ref+
X -/TL
Y -/B L
V ref
NCS
OSC
in
A D C out
ref-
D igital
Filter
T o the
H o st
DOUT
D IN
GND
Revision V1.7/October 2010
©2010 Semtech Corp.
Page 1
www.semtech.com
