Specifications

INTELLIGENT PLATFORM MANAGEMENT INTERFACE
PP 41x/03x 7-9
7.4.4.1 Board and CPU Temperature Sensors
An Analog Devices ADT7461 device measures the local board and CPU die temperature with a
resolution of 0.125°C. The device has a quoted accuracy of +/- 1°C over a range of +60°C to
+100°C, and of +/- 3°C outside this range.
NOTE: A National Semiconductor LM86 device was fitted on Rev A and Rev B boards.
The ADT7461 and LM86 are software compatible.
7.4.4.2 Fan Monitor
Fan failure is detected by a single change in the state of the fan monitor input on the J5 connector.
The signal state that indicates failure is set in the Sensor Data Record (SDR) for this sensor. The
Assertion Event Mask / Lower Threshold Reading Mask and De-assertion Event Mask / Upper
Threshold Reading Mask fields are used to set these parameters. The default settings for these
fields select an active low fan failure indication. To select an active high fan failure indication, the
pre-defined SDR must be deleted and replaced by one which sets these fields to 0002h.
7.4.4.3 Board Voltage Sensors
The microcontroller measures various on-board voltages, namely: +12V, +5V, +3.3V, 1.5V, 1.8V,
VTT (memory bus terminations), VCPU (processor core), VCCP (front side bus terminations). The
sensor reading is a raw value and must be converted to Volts by application software. The
formulas are (where x is the raw sensor reading):
+12V = 0.0740x
+5V = 0.0237x
+3.3V = 0.0190x
+1.5V = 0.0096x
+1.8V = 0.0096x
CPU CORE = 0.0096x
VCCP = 0.0096x
VTT = 0.0096x
These conversion factors are also in the SDR associated with each sensor so application software
can read them from there rather than hardcode them.
7.4.4.4 CompactPCI Slot Number
This sensor reading indicates board slot number, which is read from geographic address pins on
the CPCI backplane. The possible values are from 0 to 31.
7.4.4.5 CompactPCI BDSEL Signal
This sensor reading indicates status of the BDSEL# pin on the CPCI backplane. The board is fully
seated if the value is 1. If the value is 0, the board is not fully seated.
7.4.4.6 CompactPCI SYSEN Signal
This sensor reading indicates status of the SYSEN# pin on the CPCI backplane. The board is in
the system controller slot if the value is 1. If the value is 0, the board is not in the system controller
slot.
7.4.4.7 CompactPCI PRESENT Signal
This sensor reading indicates status of the PCI_PRESENT# pin on the CPCI backplane. The PCI
bus is present at this slot if the value is 1. If the value is 0, the PCI bus is not present at this slot.
This sensor is provided mainly for use with PICMG 2.16 backplanes.
7.4.4.8 Hot Swap Control Power Good
This sensor reading indicates status of power supply voltages from the backplane. If the value is 0,
the power supply voltages are within specification. If the value is 1, one or more voltages are out of
specification.
7.4.4.9 Hot Swap Control Power Fail
This sensor reading indicates status of power supply currents from the backplane. If the value is 0,
the power supply currents are good. If the value is 1, an over-current has occurred.