UR7HCTS2-S840 datasheet, PDF - EEWORLD Datasheet

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UR7HCTS2-S840: DescriptionHigh-Performance, Low Power Touch Screen Controller/Digitizer; File Size147KB，16 Pages; ManufacturerSEMTECH; Websitehttp://www.semtech.com

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UR7HCTS2-S840 Overview

High-Performance, Low Power Touch Screen Controller/Digitizer

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ScreenCoder

UR7HCTS2-S840

High-Performance, Low Power

Touch Screen Controller/Digitizer

HID & SYSTEM MANAGEMENT PRODUCTS, MOUSECODER

FAMILY

DESCRIPTION

The ScreenCoder

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

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

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 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.

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

• Zero-Power

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

APPLICATIONS

• Wireless Internet Appliances

• Handheld PCs (H/PCs)

PIN ASSIGNMENTS

• Web Phones

• Portable Systems

_RB

RSVD2

TxD

ISEL/SCLK

SOUT

_PWR_DOWN

SXL

SYT

YT2

XL2

RVSD1

XDAT

XCLK

_LB

XR2

YB2

_RTS/_SS

XL1

YT1

LQFP

YB1

XR1

VSS

_OSCOUT

OSCIN

VDD

VSS2

_RESET

VREF

_CTS/_ATN

XPWRS

SXR

SYB

ScreenCoder, MouseCoder and Self-Power

Management are a trademark of Semtech Corp.

All other trademarks belong to their respective

companies.

DOC7-TS2-S840-DS-102

www.semtech.com

FUNCTIONAL DESCRIPTION

The UR7HCTS2-S840 consists functionally of five major sections (see the Functional Diagram). These are the

Sensor Interface, Power Management section, the 16-Bit Timer, the Oscillator Circuit and the Serial Peripheral

Interface (SPI) and the Asynchronous Serial Interface (Serial). All sections communication with each other and

operate concurrently.

OSCILLATOR

This IC has a built-in Oscillator circuit capable of operations with an external 4.00 MHz Clock source, or a Ceramic

Resonator (preferably with built-in Load Capacitors). Note, that the Crystals can NOT be used. The ScreenCoder

SPI/Serial frequently switches its Oscillator OFF and ON in order to operate with the least amount of power

consumption. Due to very high Q, the Crystal-based oscillators have exceedingly long Start-up time and can not

be used with the ScreenCoder

SPI/Serial .

EXTERNAL PS/2 INTERFACE

There is one external PS/2 port for the connection of standard PS/2 devices, including a Microsoft WheelMouse or

5-Button Mouse. The mouse motion data is sent out in relative format. The external PS/2 port also supports hot-

plug; users can connect the mouse to the system at any time without rebooting.

POWER MANAGEMENT

The ScreenCoder

SPI/Serial implements two power management methods: Self-Power Management

and

System-coordinated Power Management.

Self-Power Management

is a method implemented by the IC that, independently of any system intervention,

results in the lowest power consumption possible within the present parameters of its operation. Through Self-

Power Management

, the IC is capable of typically operating at only 1uA, independently of the state of the Host

system. Self-Power Management

primarily determines the actual power consumption of the IC. When the host is

in the active state, the IC can still operate most of the time at only 1uA, even when an active external PS/2 device

is attached to it.

Self-Power Management

offers three modes of operation: Stop, Run and Wait. "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. “Wait” mode is entered when the IC is waiting for a

response or continuation of data stream from the PS/2 device. The duration of wait mode is limited to 40ms, within

which time the IC will either receive new data from the PS/2 device or enter “Stop” mode. Typical power

consumption in this mode is several hundred uAs. “Run” mode is entered briefly, only to process an event. The IC

will only remain in this mode when there are pending tasks, such as PS/2 report reception or initialization of the

PS/2 device.

System Request To Send,

Mouse hot plug or Data Packet,

Touch Screen activity,

Button press

Figure 1:

Self-Power Management

State

RUN

STOP

1s of inactivity

DOC7-TS2-S840-DS-102

www.semtech.com

UR7HCTS2-S840 Related Products

	UR7HCTS2-S840	UR7HCTS2-S840-FG
Description	High-Performance, Low Power Touch Screen Controller/Digitizer	High-Performance, Low Power Touch Screen Controller/Digitizer

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