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PDF UR7HCTS2-P840 Data sheet ( Hoja de datos )

Número de pieza UR7HCTS2-P840
Descripción High-Performance/ Low Power PS/2 Touch Screen Controller/Digitizer
Fabricantes Semtech Corporation 
Logotipo Semtech Corporation Logotipo



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ScreenCoderTM UR7HCTS2-P840
High-Performance, Low Power PS/2
Touch Screen Controller/Digitizer
HID & SYSTEM MANAGEMENT PRODUCTS, MOUSECODERTM FAMILY
DESCRIPTION
The ScreenCoderTM PS2 is a high-
performance IC that interfaces any
4 or 8-wire resistive touch screen
to the standard PS/2 mouse port.
Low-power and tiny, the single IC
is ideal for portable systems, web
phones 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 concurrently without
any penalty.
The UR7HCTS2-P840 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, offers a high-
functionality driver which includes
inking capabilities.
Mice connected to the
ScreenCoderTM PS2 external 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 ScreenCoderTM 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.
FEATURES
• Controller & digitizer in a single IC;
no need for external A/D
• Interfaces ANY 4- or 8-wire
resistive touch screen to standard
PS/2 mouse port; regardless of
size, material or vendor
• High-performance IC offers
accurate cursor control due to
advanced algorithms
• Low-power consumption, due to
sophisticated power management
states, ideal for battery-operated
systems
• Highly resistant to RF & other
noise sources
• Enables hot-plug connection of
an external pointing device
• Wheelmouse functionality is
supported in the external pointing
device
• Other interfaces available
• Embedded touch screen and
external pointing device can
operate concurrently with no
performance penalty
• Supports both absolute and
relative (mouse-like) modes of
operation
• For relative mode, no special
drivers are needed; high-
functionality driver available for
absolute mode
• Supports all commands defined
in the IBM PS/2 Mouse
Communication Protocol, as
well as Semtech’s extended PS/2
communication protocol with
absolute positioning support
• Available in a low-profile 32-pin
LQFP package
• Few external components required
APPLICATIONS
• Portable systems
• Notebooks and Laptops
PIN ASSIGNMENTS
• Interactive Kiosks
• Touch-enabled monitors
32
SYB
SXR
XPWRS
RSVD1
VREF
RESET
VSS2
VDD
1
8
9
25
24
LB
XR2
YB2
YT2
XL2
HDAT
XDAT
XCLK
17
16
ScreenCoder and MouseCoder are trademarks of
Semtech Corporation. All other trademarks belong
to their respective companies.
Copyright ©1999-2001 Semtech Corporation
DOC7-TS2-P840-DS-106
1
www.semtech.com

1 page




UR7HCTS2-P840 pdf
POWER MANAGEMENT (CON’T)
The "Stop" mode is the lowest
power consumption mode. In this
mode, the oscillator is stopped and
the IC consumes only the leakage
current. This is the default mode to
which the IC will revert when it is
idle. An event or signal conditions
wake-up the IC. The
ScreenCoderTM PS2 can still
operate most of the time at only
1uA, even when the host is in the
active state, and with active
external PS/2 device attached to
the ScreenCoderTM PS2. If an
external PS/2 device sends a data
packet, the ScreenCoderTM PS2 will
exit the "Stop" mode for as long as
it takes to process the message
and relay the information to the
system. This operation is done
transparently to the host, without
any data loss or any response
delay from the input device.
System-coordinated Power
Management
Normal Operation State
In normal operation state, both
_PWR_DOWN and XPWRS pins are
in high state. ScreenCoderTM PS2
operations are controlled by Self-
Power ManagementTM.
Critical Suspend
At any time, the Host may negate
the _PWR_DOWN pin in order to
force the ScreenCoderTM PS2 into a
"Critical suspend" mode. This
signal can be activated (driven
low) due to specific conditions of
the Host's operations (for example,
a discharged battery), or due to
actions of the Operating System or
BIOS.
Figure 1: Semtech’s Self-Power ManagementTM State
System Request To Send,
Mouse hot plug or Data Packet,
Touch Screen activity,
Button press
RUN
STOP
1s of inactivity
POWER MANAGEMENT (CON’T)
During the "Critical suspend", the ScreenCoderTM will shut down all of the
pointing activities. However, the communications with the Host are still
enabled.
External PS/2 power down
The ScreenCoderTM PS2 monitors the power state of the external PS/2
pointing device through the XPWRS pin. If the IC senses that the external
PS/2 device has been powered-down by the host, it will actively eliminate
shot-through current in the input buffers for the clock and data lines by
driving both low.
The ScreenCoderTM UR7HCTS2-P840 will re-initialize the external PS/2
pointing device when the power to the external PS/2 port is restored.
Figure 2: Semtech’s System-coordinated Power Management
Critical Suspend
_PWR_DOWN=0
_PWR_DOWN=1
and XPWRS=0
_PWR_DOWN=0
_PWR_DOWN=1
and XPWRS=1
Ext Mouse
power down
_PWR_DOWN=1
and XPWRS=0
_PWR_DOWN=1
and XPWRS=1
Normal State
Copyright ©1999-2001 Semtech Corporation
DOC7-TS2-P840-DS-106
5
www.semtech.com

5 Page





UR7HCTS2-P840 arduino
SCREENCODERTM PS2 EVALUATION BOARD MECHANICAL
Copyright ©1999-2001 Semtech Corporation
DOC7-TS2-P840-DS-106
11
www.semtech.com

11 Page







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