Sun Microsystems CP2500 manual Switching Power On and Off

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Switching Power On and Off

The on-board voltage controller allows power to the CPU of the Netra CP2500 only when the following conditions are met:

■The VDD core-1.1-volt supply voltage is greater than 1.0 volts (within 10% of nominal).

■The 12-volt supply voltage is greater than 10.8 volts (within 10% of nominal).

■The 5-volt supply voltage is greater than 4.5 volts (within 10% of nominal)

■The 3.3-volt supply voltage is greater than 3.0 volts (within 10% of nominal).

The controller requires these conditions to be true for at least 100 milliseconds to help ensure the supply voltages are stable. If any of these conditions become untrue, the voltage monitoring circuit shuts down the CPU power of the board.

Inlet, Exhaust, and CPU Temperature Monitoring

The CPU diode sensor reading may vary from slot to slot and from board to board in a system, and is dependent primarily on system cooling. As an example, a system might have sensor readings for the CPU diode from 35˚C to 49˚C with an ambient inlet of 21˚C across many boards, with a variety of configurations and positions within a chassis. Care must be taken when setting the alarm and shutdown temperatures based on the CPU diode sensor value. This sensor typically is linear across the operating range of the board.

The exhaust sensor measures the local air temperature at the trailing edge of the board for systems with bottom to top airflow. This value depends on the character and volume of the airflow across the board. Typical values in a chassis may range from a delta over inlet ambient of 0˚C to 12˚C, depending on the power dissipation of the board configuration and the position in the chassis. The exhaust sensor is nonlinear with respect to ambient inlet temperature.

The inlet sensor measures the local air temperature at the leading edge of the board on the solder side under the solder-side cover. This value typically can range from a reading of 0˚C to 13˚C above inlet system ambient in a chassis. Care must be taken to understand the application and installation of the board to use this temperature sensor.

A sudden drop of all temperature sensors close to or near room ambient temperature can mean loss of power to one or more Netra CP2500s.

A gradual increase in the delta temperature from inlet to outlet can be due to dust clogging system filters. This feature can be used to set service levels for filter cleaning or changing.

Chapter 2 Environmental Monitoring 31

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Contents Netra CP2500 Board Programming Guide Page Contents User Flash Figures Vi Netra CP2500 Board Programming Guide March Tables Viii Netra CP2500 Board Programming Guide March Code Samples Netra CP2500 Board Programming Guide March How This Book Is Organized PrefaceTypographic Conventions Using Unix CommandsRelated Documentation Shell PromptsDocumentation, Support, and Training Third-Party Web SitesSun Welcomes Your Comments Overview Watchdog TimerPicl Plug-In Module 2Properties Under watchdog-controllerNode 1Watchdog Plug-In Interfaces for Netra CP2500 Board SoftwareHEALTHY# 3Properties Under watchdog-timerNodeCode Example 1-1System Watchdog Node Management Code Example Watchdog Node Management CodeCode Example 1-1System Watchdog Node Management Code Example Usagestr Code Example 1-1System Watchdog Node Management Code Example Code Example 1-1System Watchdog Node Management Code Example Code Example 1-1System Watchdog Node Management Code Example Code Example 1-1System Watchdog Node Management Code Example Code Example 1-1System Watchdog Node Management Code Example Null Code Example 1-1System Watchdog Node Management Code Example Code Example 1-1System Watchdog Node Management Code Example Code Example 1-1System Watchdog Node Management Code Example Code Example 1-1System Watchdog Node Management Code Example Code Example 1-1System Watchdog Node Management Code Example Notreached Code Example 1-1System Watchdog Node Management Code Example OpenBoot Prom Interface Netra CP2500 Board Programming Guide March Environmental Monitoring Environmental Monitoring Component Compatibility Typical Environmental Monitoring System Application1Compatible Environmental Monitoring Components I2C Environmental Monitoring Protection at the OpenBoot Prom Typical Cycle From Power Up to ShutdownPost Shutdown Recovery 3I2C Components Hardware Environmental Monitoring FunctionsEnvironmental Monitoring CPU Inlet, Exhaust, and CPU Temperature Monitoring Switching Power On and OffNetra CP2500 Board Programming Guide March Critical Temperature Response at OpenBoot Prom OpenBoot Prom Environmental MonitoringEnvironmental Monitoring Application Programming Using the show-sensorsCommand at OpenBoot Prom4PICL Temperature Sensor Class Node Properties Reading Temperature Sensor States UsingSolaris Driver Interface Using a Configuration File for Sensor InformationCode Example 2-1Sample envmond Application Program Sample Application ProgramCode Example 2-1Sample envmond Application Program Code Example 2-1Sample envmond Application Program Code Example 2-1Sample envmond Application Program Prtdiag command example Reading the CPU Temperature Environmental Limits5Description of Values Displayed by Solaris Commands User Flash Usage and Implementation User FlashOpenBoot Prom Device Tree and Properties User Flash Driver1User Flash Node Properties User Flash Device Files Application Programming InterfaceInterface Header File 2System CallsCode Example 3-1PROM Information Structure Structures to Use in Ioctl ArgumentsErrors Example ProgramsCode Example 3-2User Flash Interface Structure Code Example 3-3Read Action on User Flash Device Read Example ProgramCode Example 3-4Write Action on User Flash Device Write Example ProgramCode Example 3-4Write Action on User Flash Device Code Example 3-5Block Erase Action on User Flash Device Block Erase Example ProgramCode Example 3-5Block Erase Action on User Flash Device Code Example 3-6Sample User Flash Application Program Sample User Flash Application ProgramCode Example 3-6Sample User Flash Application Program Code Example 3-6Sample User Flash Application Program Code Example 3-6Sample User Flash Application Program Code Example 3-6Sample User Flash Application Program Code Example 3-6Sample User Flash Application Program Picl IndexWatchdog-controller, 3 Watchdog-timer, 3
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