Intel® Server System S7000FC4UR TPS Main Board Server Management
Revision 1.0
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3.3 Supported Features
3.3.1 Fan Speed Control
The BMC monitors and controls system fans, with each fan having a tachometer sensor used to
determine cooling system health. The fan subsystem has three states:
Sleep
Nominal
Boost
Nominal is the default state. In this state, fan speeds are based on the ambient system
temperature. A system temperature threshold is set via an SDR. When the threshold is
exceeded, it linearly ramps the fan speeds either until the fan speed reaches maximum
saturation or the temperature reduces below the threshold.
If the system temperature stays below the threshold, fan speed ramps back to the default
speed. If system temperature remains above the threshold, the system (through Closed Loop
Thermal Throttling – CLTT) may throttle memory to reduce heat dissipation.
Fan settings are configurable via SDRs to allow for the specific cooling requirements needed by
system integrators. A test command can also be issued to manually force the fan speed to a
selected value, overriding any other control or policy.
3.3.2 Hardware Monitoring (LM94*)
The main board platform design uses two LM94* hardware monitoring devices. The LM94*’s
can be controlled/monitored by BMC over the System Management Bus (SMBus). Please see
Figure 9 for LM94* SMBus connectivity. The following LM94* features are supported on the
main board.
CPU monitoring (PROCHOT#, THERMTRIP#, IERR#)
CPU Vreg monitoring (VRHOT#)
Fan control/monitoring (PWM, Tach)
3.3.3 PECI (ADT7490*)
The main board implements the Platform Environment Control Interface (PECI) to monitor
processor temperature. PECI is a one-wire bus interface that provides a communication channel
between an Intel processor (and potentially future chipset components) and an external
monitoring device. In the case of main board, the monitoring device has been chosen to be the
ADT7490*.
Note: The ADT7490* will complement other fan control and temperature monitoring devices and
is in addition to two National (Winbond*) LM94* devices.
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