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UR7HCTS2-P540 Datasheet

  • UR7HCTS2-P540

  • 150.90KB

  • 14頁

  • ETC

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ScreenCoder
TM
UR7HCTS2-P540
Controller/Digitizer for 5-Wire
Touch Screens
HID & SYSTEM MANAGEMENT PRODUCTS, MOUSECODER
TM
FAMILY
DESCRIPTION
The ScreenCoder
TM
PS2 is a high-
performance IC that interfaces any
5-wire resistive touch screen to the
standard PS/2 mouse port. Low-
power and tiny, the single IC is ideal
for industrial & medical systems,
portables and interactive kiosks. It
offers an advanced algorithm for
enhanced motion control as well as
an extra port for hot-plug
connection of an external PS/2
pointing device. Both the touch
screen and the external device can
be operated oncurrently without any
penalty.
The UR7HCTS2-P540 is equipped
with a special command protocol
that enables the touch screen to
operate in either relative (mouse-
like) or absolute positioning mode.
Because the IC interfaces via the
PS/2 mouse port, it can utilize any
standard mouse driver when
operating in relative mode. For
absolute positioning, Semtech
offers a high-functionality driver
which includes inking capabilities.
Mice
connected
to
the
TM
PS2鈥檚
external
ScreenCoder
mouse port will always act in relative
mode, even if the touch screen is
operating in the absolute mode.
The PS/2 communication channel is
bi-directional at 10 kbps.
The ScreenCoder
TM
PS2 offers
built-in A/D. Touch detection and
motion are handled in firmware, and
no digitizer is required. The cost-
effective solution requires few
external components, allowing for a
simple and real estate saving
implementation.
Note, some versions offer a PS/2
port with MouseWheel and 5-button
mouse functionality.
FEATURES
鈥?Controller & digitizer in a single IC;
no need for external A/D
鈥?Interfaces ANY 5-wire resistive
touch screen to standard PS/2
mouse port; regardless of size,
material or vendor
鈥?High-performance IC offers
accurate cursor control due to
advanced algorithms
鈥?Low-power consumption, due to
sophisticated power management
states, ideal for battery-operated
systems
鈥?Highly resistant to RF & other
noise
鈥?Enables hot-plug connection of
an external pointing device
鈥?Available in a low-profile 32-pin
LQFP package
APPLICATIONS
鈥?Interactive Kiosks
鈥?Portable Systems
PIN ASSIGNMENTS
鈥?POS Terminals
鈥?Industrial & Medical Systems
鈥?Embedded touch screen and
external pointing device can
operate concurrently with no
performance penalty
鈥?Supports both absolute and
relative (mouse-like) modes of
operation
鈥?For relative mode, no special
drivers are needed; high-
functionality driver available for
absolute mode
鈥?Supports all commands defined
in the IBM PS/2 Mouse
Communication Protocol, as
well as Semtech鈥檚 extended PS/2
communication protocol with
absolute positioning support
鈥?Few external components required
RB
RSVD1
RSVD2
RSVD3
RSVD4
POWER_DOWN
NW_AD
NE_AD
32
1
25
24
SW_AD
SE_AD
SENSE_DRV
SENSE_AD
VREF
RESET
VSS2
VDD
8
9
16
17
TOUCH
SE2
SW2
NE2
NW2
HDAT
XDAT
XCLK
Copyright 漏1999-2001
Semtech Datasheet DOC7-TS2-P540-DS-101
1
OCSIN
OSCOUT
VSS
SE1
SW1
NE1
NW1
HCLK
www.semtech.com

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