Sun Microsystems Netra CP2500 - Manual (Page 42)

28 Netra CP2500 Board Programming Guide • March 2007
Hardware Environmental Monitoring
Functions
This section summarizes the hardware environmental monitoring features on the
Netra CP2500 board.
TABLE 2-2 lists the environmental monitoring functions on a
Netra CP2500 board.
TABLE 2-3 shows the I 2 C components.
FIGURE 2-2 shows the location of the environmental monitoring hardware on the
Netra CP2500.
TABLE 2-2 Typical Netra CP2500 Board Hardware Environmental Monitoring Functions
Function Capability
Board Exhaust Air
Temperature Senses the air temperature at the trailing edge of the board.
Assumes air direction from the PMC slots toward the
processor/heatsink.
CPU Diode
Temperature Senses a diode temperature in the processor junction.
Board Inlet Air
Temperature Senses the air temperature at the leading edge of the board under
the solder-side cover. Assumes air direction from the PMC slots
toward the processor/heatsink.
TABLE 2-3 I 2 C Components
Component Function
DS80CH11 SMC I 2 C controller – IPMB
PCF9545 4 channel I 2 C multiplexor
AT24C64 I 2 C EEPROM – motherboard FRUID
AT24C01 I 2 C EEPROM – RTM FRUID and external I 2 C header
ADM1026 System monitor and general purpose I/O
AT24C64 I 2 C EEPROM – NVRAM/Ethernet MAC ID
AT24Cxx I 2 C EEPROM – DIMM 1 SPD (add-on dependent)
AT24Cxx I 2 C EEPROM – DIMM 0 SPD (add-on dependent)
ALi1535D+ Southbridge – SMBUS and I 2 C controller