ur7hcts2-u860 Semtech Corporation, ur7hcts2-u860 Datasheet - Page 3

• Manufacturer Part Number: ur7hcts2-u860
• Description: High-performance Usb Touch Screen Controller / Digitizer - Semtech Corporation
• Manufacturer: Semtech Corporation

The UR7HCTS2-U860 consists
functionally of five major sections
(see the Functional Diagram on
Page 2). These are the Sensor
Interface, the Power Management
Section, the 16-Bit Timer, the
Oscillator Circuit and the USB
Interface.
According to the USB specification,
if there is no activity of the USB port
for 3 ms, the system is considered
to be in a suspended state. The
ScreenCoder
detecting that the system is in
suspend, will check the state of the
touch screen and the right button.
If there is no touch pressure
detected or no button pressed, the
ScreenCoder
suspended state. In suspend the
IC fully complies with the USB
specification for the power
consumption, dissipating current
only in the USB-mandated pull-up
for the device identification.
Another technique the IC uses to
conserve power is called remote
wake-up. If the system relies on the
device to perform wake-up, the IC
will send a resume message to the
system when there is activity on the
touch screen or button.
This IC has a built-in Oscillator
circuit capable of operations with
an external 6.00 MHz Clock source,
or a Ceramic Resonator (preferably
with built-in Load Capacitors) or a
Crystal with external Load
Capacitors.
Copyright Semtech 2000-2001
DOC7-TS2-U860-DS-101
FUNCTIONAL DESCRIPTION
OSCILLATOR
POWER MANAGEMENT
TM
TM
USB IC, on
USB enters into the
Mnemonic Pin #
Power:
VDD
VSS
3.3V
_Reset
Oscillators:
OSCI
OSCO
USB:
D-
D+
Touch
Screen:
XR1, XR2
YB1, YB2
YT1, YT2
XL1, XL2
SXR
SYB
SYT
SXL
VREF
SOUT
_RB
RDVD1-13
Note: An underscore before a pin mnemonic denotes an active low signal.
Pin Types Legend: I=Input; O=Output; I/O=Input or Output; P=Power; Al= Analog Input
If the system does not allow remote wake-up, the ScreenCoder
not send resume messages to the system when it is awoken by activity on
the touch screen or button.
PIN DEFINITIONS
POWER MANAGEMENT (CON’T)
3
23-25,
27-28
14,18
19,32
31,20
21,30
22,29
1-3,8-11
15
22
16
17
35
36
12
23
34
33
13
7
6
5
4
Type
P
P
P
I
I
O
I/O
I/O
I/O
I/O
I/O
I/O
Al
Al
Al
Al
Al
O
I
I/O
Name and Function
Power Supply
Ground
USB Reference Voltage Out
Reset
Oscillator Input
Oscillator Output
USB D- Line
USB D+ Line
Touch Screen Right Drive Pins
Touch Screen Bottom Drive Pins
Touch Screen Top Drive Pins
Touch Screen Left Drive Pins
Touch Screen Sense Pin: for X Right
Touch Screen Sense Pin: for Y Bottom
Touch Screen Sense Pin: for Y Top
Touch Screen Sense Pin: for X Left
Voltage Reference for A/D Converter
Output control data to A/D Converter
Mouse Right Button
Reserved for future use
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TM
USB will