Technical Product Specification

Intel® Server System SR1695WB TPS Power Sub-System
Revision 1.4 21
Intel order number: E92079-005
will auto recover from this condition, when the temperature is within specification again. In
case of a fan fail, the power supply will latch off.
 Warning: 80°C (+/-6°C)
 Critical shut down: 90°C (+/-6°C)
 Re-start PSU: 75°C (+/-6°C)
3.6.4 Thermal Fan Speed Control(External Control)
The power supply Fan shall be external control able through a hardware pin on the
connector. This function allows overwriting the MCU Fan control due to thermal stress at the
PDB. In normal operation the MCU controls the fan depending on Loading and internal
temperature. The Pin B3 (B/P fail) controls the internal Fan duty depending on voltage level
recognized, corresponding to Table 27.
Table 27. Fan Speed Control
Voltage @ Pin B3 Fan Duty
< 1.00V MCU controlled
1.25V 50%
1.5V 60%
1.75V 70%
2.00V 80%
2.5V 100%
3.7 PMBus*
The PMBus* features are requirements for AC/DC silver box power supply for use in server
systems. It is also required to enable Intel
®
Intelligent Power Node Manager. This
specification is based on the PMBus* specifications part I and II, revision 1.1. The power
supply device address locations are shown below:
Figure 13. Power Supply Device Address