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UR7HCTS2-U860 Datasheet(PDF) 3 Page - Semtech Corporation |
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UR7HCTS2-U860 Datasheet(HTML) 3 Page - Semtech Corporation |
3 / 12 page FUNCTIONAL DESCRIPTION PIN DEFINITIONS Copyright Semtech 2000-2001 DOC7-TS2-U860-DS-101 www.semtech.com 3 Mnemonic Pin # Type Name and Function Power: VDD 15 P Power Supply VSS 14,18 P Ground 3.3V 22 P USB Reference Voltage Out _Reset 13 I Reset Oscillators: OSCI 16 I Oscillator Input OSCO 17 O Oscillator Output USB: D- 35 I/O USB D- Line D+ 36 I/O USB D+ Line Touch Screen: XR1, XR2 19,32 I/O Touch Screen Right Drive Pins YB1, YB2 31,20 I/O Touch Screen Bottom Drive Pins YT1, YT2 21,30 I/O Touch Screen Top Drive Pins XL1, XL2 22,29 I/O Touch Screen Left Drive Pins SXR 7 Al Touch Screen Sense Pin: for X Right SYB 6 Al Touch Screen Sense Pin: for Y Bottom SYT 5 Al Touch Screen Sense Pin: for Y Top SXL 4 Al Touch Screen Sense Pin: for X Left VREF 12 Al Voltage Reference for A/D Converter SOUT 23 O Output control data to A/D Converter _RB 34 I Mouse Right Button RDVD1-13 1-3,8-11 I/O Reserved for future use 23-25, 27-28 33 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 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. 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. 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. OSCILLATOR 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. 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. POWER MANAGEMENT POWER MANAGEMENT (CON’T) |
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