UR7HCTS2-U860 查看數據表（PDF） - Semtech Corporation
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UR7HCTS2-U860 Datasheet PDF : 12 Pages
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FUNCTIONAL DESCRIPTION
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.
OSCILLATOR
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.
POWER MANAGEMENT
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
ScreenCoderTM USB IC, on
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
ScreenCoderTM USB enters into the
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.
PIN DEFINITIONS
Mnemonic Pin #
Power:
VDD
15
VSS
14,18
3.3V
22
_Reset
13
Oscillators:
OSCI
16
OSCO
17
USB:
D-
35
D+
36
Touch
Screen:
XR1, XR2 19,32
YB1, YB2 31,20
YT1, YT2
21,30
XL1, XL2
22,29
SXR
7
SYB
6
SYT
5
SXL
4
VREF
12
SOUT
23
_RB
34
RDVD1-13
1-3,8-11
23-25,
27-28
33
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
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
POWER MANAGEMENT (CON’T)
If the system does not allow remote wake-up, the ScreenCoderTM USB will
not send resume messages to the system when it is awoken by activity on
the touch screen or button.
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.
Copyright Semtech 2000-2001
3
DOC7-TS2-U860-DS-101
www.semtech.com
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