UR7HCTS2-S840 Datasheet, PDF (1/16 Pages) Semtech Corporation – High-Performance, Low Power Touch Screen Controller/Digitizer

ScreenCoder^TM UR7HCTS2-S840
High-Performance, Low Power
Touch Screen Controller/Digitizer
HID & SYSTEM MANAGEMENT PRODUCTS, MOUSECODER^TM FAMILY
DESCRIPTION
The ScreenCoder^TM SPI/Serial is a
touch screen controller and
integrated digitizer IC designed
specifically for RISC-based
systems, such as wireless Internet
appliances. The small, single
footprint IC interfaces the system
via either the Serial Peripheral
Interface (SPI) or Asynchronous
Serial Interface.
Unlike simple A/D implementations,
the ScreenCoder^TM SPI/Serial does
not require complicated software
drivers and no processing burden
is placed on the CPU. Due to the
IC’s superior data processing and
sampling rate, the ScreenCoder^TM
SPI/Serial is ideal for use in systems
requiring handwriting recognition.
Patented-power management
techniques are also implemented
so that the IC only consumes 1uA
of current most of the time, even
with the external mouse connected.
The IC operates at 3 to 5 Volts.
FEATURES
• Touch screen controller / digitizer
in a single, small footprint IC
• Interfaces the system via either
Serial Peripheral Interface (SPI)
and Asynchronous Serial Interface
• Works with any 4- or 8-wire
resistive touch screen, regardless
of size, material or vendor
• Provides high resolution of 1000
points per axis and a sampling
rate of 200Hz
• Accurate, quick touch response
due to advanced sampling
technology and patented
algorithms
APPLICATIONS
• Wireless Internet Appliances
• Handheld PCs (H/PCs)
PIN ASSIGNMENTS
• Zero-Power^TM operation — IC
typically consumes less than 1µA
• Highly resistant to RF and other
noise sources
• Uses sophisticated power
management for maximum power
savings
• Offers external PS/2 port for the
hot-plug connection of an external
PS/2 pointing device
• Capable of providing other
features, such as battery
monitoring and GPIO
• PS/2 and USB interfaces available
• Available in small 7mm X 7mm
32-pin LQFP package
• Web Phones
• Portable Systems
Features of Semtech’s motion
algorithm include resistance to RF
and other noise which provides
smooth and precise motion control.
The UR7HCTS2-S840 also works
flawlessly with any 4 or 8-wire touch
screen, regardless of size or
manufacturer.
The cost-effective solution requires
few external components, allowing
for a simple and real estate saving
implementation.
24
25
_RB
RSVD2
TxD
ISEL/SCLK
SOUT
_PWR_DOWN
SXL
SYT
32
1
LQFP
17
16
_RTS/_SS
XL1
YT1
YB1
XR1
VSS
_OSCOUT
OSCIN
9
8
ScreenCoder, MouseCoder and Self-Power
Management are a trademark of Semtech Corp.
All other trademarks belong to their respective
companies.
Copyright Semtech 2000-2001
1
DOC7-TS2-S840-DS-102
www.semtech.com