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Semtech - Multitouch 4-wire Resistive Touchscreen Controller

Numéro de référence SX8651
Description Multitouch 4-wire Resistive Touchscreen Controller
Fabricant Semtech 
Logo Semtech 





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SX8651 fiche technique
SX8651
Multitouch 4-wire Resistive Touchscreen
Controller with 15kV ESD Protection
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
4
GENERAL DESCRIPTION
KEY PRODUCT FEATURES
The SX8651 is a multitouch controller that enables a
completely different user interaction with 4-wire resistive
touchscreen. It enables detection of 2 fingers on the
touchscreen and several gestures like rotation and pinch/
stretch.
This ultra low power touchscreen controller has been
optimized for portable equipment where power and board-
space are at a premium.
It incorporates a highly accurate 12-bit ADC for data
conversion and operates from a single 1.65 to 3.7V supply
voltage.
The SX8651 features a built-in preprocessing algorithm for
data measurements, which greatly reduces the host
processing overhead and bus activity. This complete
touchscreen solution includes four user-selectable
operation modes which offer programmability on different
configurations such as conversion rate and settling time,
thus enable optimization in throughput and power
consumption for a wide range of touch sensing applications.
The touch screen 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 SX8651 is offered in two tiny packages: 3.0 mm x
3.0 mm DFN and a 1.5 mm x 2.0 mm wafer-level chip-scale
package (WLCSP).
APPLICATIONS
Extremely Low Power Consumption: [email protected] 8kSPS
Superior On-chip ESD Protection
±15kV HBM (X+,X-,Y+,Y-)
±2kV CDM
±25kV Air Gap Discharge
±15kV Contact Discharge
±300V MM
Compatible with a Wide Range of 4-wire Resistive
Touchscreen for Single/Multi-touch Operation
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
High Precision 12-bit Resolution
Low Noise Ratiometric Conversion
Selectable Polling or Interrupt Modes
Touch Pressure Measurement
400kHz Fast-Mode I²C Interface
Hardware Reset & I²C Software Reset
-40°C to 85°C Operation
Pin-compatible with SX8650
Android and Linux Driver Support Available
12-LD DFN Package / 12-Ball WLCSP Package
RoHS, WEEE, HF and pb free
Portable Equipment
Mobile Communication Devices
Cell phone, PDA, MP3, GPS, DSC
Touch Screen Monitors
Block Diagram
ORDERING INFORMATION
Part Number
SX8651ICSTRT1
SX8651IWLTRT1
Package (Dimension in mm)
12 - Ball WLCSP (1.5 x 2.0)
12 - Lead DFN (3.0 x 3.0)
1. 3000 Units / reel
Marking
FD77
FD77
Revision V1.5/December 2010
©2010 Semtech Corp.
VDD
X+
Y+
X-
Y-
GND
Touch
Screen
In te rfa c e
V re f
C o n tro l
SX8651 AUX
A0
NRST
POR
OSC
I2 C
SCL
ref+
in A D C out
ref-
D igital
F ilter
SDA
N IR Q
Page 1
HOST
www.semtech.com

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