|
|
PDF UR7HCTS2-S840 Data sheet ( Hoja de datos )
| Número de pieza | UR7HCTS2-S840 | |
| Descripción | High-Performance/ Low Power Touch Screen Controller/Digitizer | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de UR7HCTS2-S840 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
|
No Preview Available !
ScreenCoderTM UR7HCTS2-S840
High-Performance, Low Power
Touch Screen Controller/Digitizer
HID & SYSTEM MANAGEMENT PRODUCTS, MOUSECODERTM FAMILY
DESCRIPTION
The ScreenCoderTM 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 ScreenCoderTM 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 ScreenCoderTM
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-PowerTM 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
DOC7-TS2-S840-DS-102
1
www.semtech.com
1 page  
POWER MANAGEMENT (CON’T)
System-coordinated Power
Management
Figure 2: System-coordinated Power Management
Normal Operation State:
In normal operation state, both the
_PWR_DOWN and XPWRS pins are
in high state. The ScreenCoderTM
SPI/Serial operations are controlled
by Self-Power ManagementTM.
Critical Suspend
_PWR_DOWN=0
_PWR_DOWN=1
and XPWRS=0
_PWR_DOWN=0
_PWR_DOWN=1
and XPWRS=1
Critical Suspend:
At any time, the Host may negate
the _PWR_DOWN pin in order to
force the ScreenCoderTM SPI/Serial
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.
During the "critical suspend", the
ScreenCoderTM SPI/Serial will shut
down all of the pointing activities.
External PS/2 power down:
The ScreenCoderTM SPI/Serial
monitors the state of the power
supply rail for 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.
Ext Mouse
power down
_PWR_DOWN=1
and XPWRS=0
Normal State
_PWR_DOWN=1
and XPWRS=1
TOUCH SCREEN SENSOR INTERFACE
The ScreenCoderTM SPI/Serial can acquire data from any four- or eight-wire
resistive touch screen sensors. The sensor interface has the following
features:
Touch detection
The IC periodically checks touch pressure applied to the panel. If there is
no touch, the IC will not perform measurements and will not send data to
system. When touch pressure is detected, the IC further qualifies and
determines the amount of pressure. Semtech’s proprietary, patent-pending
touch detection algorithm performs this test very quickly, accommodating
sensors with various plate-to-plate capacitances.
The ScreenCoderTM SPI/Serial will re-
initialize the external PS/2 pointing
device when the power to the
external PS/2 port is restored.
Copyright Semtech 2000-2001
DOC7-TS2-S840-DS-102
5
www.semtech.com
5 Page 
SUGGESTED INTERFACING FOR THE SCREENCODERTM SPI/SERIAL UR7HCTS2-S840-FG IN SERIAL MODE
Copyright Semtech 2000-2001
DOC7-TS2-S840-DS-102
11
www.semtech.com
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet UR7HCTS2-S840.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| UR7HCTS2-S840 | High-Performance/ Low Power Touch Screen Controller/Digitizer | Semtech Corporation |
| UR7HCTS2-S840-FG | High-Performance/ Low Power Touch Screen Controller/Digitizer | Semtech Corporation |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |