Sun Microsystems CP2500 manual Hardware Environmental Monitoring Functions, 3I2C Components

TABLE 2-2

Hardware Environmental Monitoring Functions

This section summarizes the hardware environmental monitoring features on the

Netra CP2500 board. lists the environmental monitoring functions on a Netra CP2500 board.

TABLE 2-2Typical Netra CP2500 Board Hardware Environmental Monitoring Functions

Function	Capability
Board Exhaust Air	Senses the air temperature at the trailing edge of the board.
Temperature	Assumes air direction from the PMC slots toward the
	processor/heatsink.
CPU Diode	Senses a diode temperature in the processor junction.
Temperature
Board Inlet Air	Senses the air temperature at the leading edge of the board under
Temperature	the solder-side cover. Assumes air direction from the PMC slots
	toward the processor/heatsink.
TABLE 2-3shows the I2C components.
TABLE 2-3I2C Components
Component	Function
DS80CH11	SMC I2C controller – IPMB
PCF9545	4 channel I2C multiplexor
AT24C64	I2C EEPROM – motherboard FRUID
AT24C01	I2C EEPROM – RTM FRUID and external I2C header
ADM1026	System monitor and general purpose I/O
AT24C64	I2C EEPROM – NVRAM/Ethernet MAC ID
AT24Cxx	I2C EEPROM – DIMM 1 SPD (add-on dependent)
AT24Cxx	I2C EEPROM – DIMM 0 SPD (add-on dependent)
ALi1535D+	Southbridge – SMBUS and I2C controller

FIGURE 2-2shows the location of the environmental monitoring hardware on the Netra CP2500.

28 Netra CP2500 Board Programming Guide • March 2007