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Description 17
Hardware Management ASIC
The Hardware Management ASIC provides low-cost instrumentation capabilities. The features of
the component include:
• Internal ambient temperature sensing
• Remote thermal diode sensing for direct monitoring of processor temperature
• Power supply monitoring (+5 V, +3.3 V, +1.5 V, 3.3 VSB, and Vccp) to detect levels above or
below acceptable values
• SMBus interface
Fan Monitoring
The Hardware Management ASIC provides four fan tachometer inputs. Monitoring can be
implemented using Intel
®
LANDesk Client Manager or third-party software.
Chassis Intrusion and Detection
The S845WD1-E server board supports a chassis security feature that detects if the chassis cover is
removed. For the chassis intrusion circuit to function, the chassis’ power supply must be connected
to AC power. The security feature uses a mechanical switch on the chassis that attaches to the
chassis intrusion connector. When the chassis cover is removed the mechanical switch is in the
closed position.
✏
NOTE
Chassis intrusion detection may be implemented using Intel LANDesk Client
Manager or third-party software.
Real-Time Clock, CMOS SRAM, and Battery
The real-time clock provides a time-of-day clock and a multi-century calendar with alarm features.
The real-time clock supports 256 bytes of battery-backed CMOS SRAM in two banks that are
reserved for BIOS use.
A coin-cell battery (CR2032) powers the real-time clock and CMOS memory. When the computer
is not plugged into a wall socket, the battery has an estimated life of three years. When the
computer is plugged in, the standby current from the power supply extends the life of the battery.
The clock is accurate to ± 13 minutes/year at 25 ºC with 3.3 VSB applied.
The time, date, and CMOS values can be specified in the BIOS Setup program. The CMOS values
can be returned to their defaults by using the BIOS Setup program.
✏ NOTE
If the battery and AC power fail, custom defaults, if previously saved, will be
loaded into CMOS RAM at power-on.