Intel SC5300BD2 Product Specification - Page 48
SMBus Monitoring Interface
UPC - 735858171755
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Intel® Server Chassis SC5300 5U Kit TPS Chassis Power Subsystem 3.3.5.1 PSON# Input and Output Signals The PSON# signal is required to remotely turn on/off the power supply. 3.3.5.2 PSKILL The purpose of the PSKill pin is to allow for hot swapping of the power supply. The mating pin of this signal on the power distribution board input connector should be tied to ground, and its resistance shall be less than 5 ohms. 3.3.5.3 PWOK (Power OK) Input and Output Signals PWOK is a Power Good, 5V TTL compatible, coming from the power supply, active HI logic signal, which will be pulled HIGH by the power supply to indicate that its +12V output is within its regulation limits. When its +12V output voltage falls below regulation limits or when AC power has been removed for a time sufficiently long so that power supply operation is no longer guaranteed, PWOK will be de-asserted to a LOW state. 3.3.5.4 lert# Output Signal This signal indicates that the power supply is experiencing a problem that the user should investigate. This signal from each supply is OR-ed on the power distribution board, and then becomes one PSALERT# output signal to the system. See the power supply specification for signal description details. 3.4 SMBus Monitoring Interface The 600-W and 730-W power supplies are compatible with both SMBus 2.0 'high power' and I2C Vdd based power and drive. This bus operates at 3.3V. The SMBus pull-ups are located on the server board. The SMBus provides power monitoring, failure conditions, warning conditions, and FRU data. Two pins have been reserved on the connector to provide this information. One pin is the Serial Clock (PSM Clock). The second pin is used for Serial Data (PSM Data). Both pins are bidirectional and are used to form a serial bus. There are two usage models depending on the system. The system shall control the usage model by setting the Usage Mode bit. Default Mode: In this mode, the LEDs and registers must automatically clear when a warning event has occurred, because there is no software, BIOS, or other agent that will access the power supply via the SMBus to do any clearing. Intelligent Mode: A system management controller or BIOS agent exists that can read and clear status. In this mode, the LEDs and registers should latch when a warning event occurs so that the system and user can read their status before it changes during transient events. There should also be a mechanism to allow the system management or BIOS to 'force' the LED states in order to identify which power supply should be replaced. Critical events will cause the power supply to shutdown and latch the LED and SMBAlert signal no matter what mode the power supply is in; "default" or Intelligent." Revision 1.31 47