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UR7HCTS2-S840-FG Datasheet(PDF) 5 Page - Semtech Corporation |
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UR7HCTS2-S840-FG Datasheet(HTML) 5 Page - Semtech Corporation |
5 / 16 page POWER MANAGEMENT (CON’T) Copyright Semtech 2000-2001 DOC7-TS2-S840-DS-102 www.semtech.com 5 Critical Suspend Ext Mouse power down Normal State _PWR_DOWN=0 _PWR_DOWN=1 and XPWRS=1 _PWR_DOWN=0 _PWR_DOWN=1 and XPWRS=1 _PWR_DOWN=1 and XPWRS=0 _PWR_DOWN=1 and XPWRS=0 Figure 2: System-coordinated Power Management 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: 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. The ScreenCoderTM SPI/Serial will re- initialize the external PS/2 pointing device when the power to the external PS/2 port is restored. 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. TOUCH SCREEN SENSOR INTERFACE |
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