I-Bus 0818D, User Manual

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Chapter 6 – Platform Management Option
0818D User’s Guide 6-5
Sensor No. Voltage Resolution (10 bit)
Volt0 +3.3V 20 mV
Volt1 +5V 30 mV
Volt2 Battery 6V 40 mV
Volt3 -12V 53 mV
Volt4 +12V 80 mV
Volt5 and
Volt6 120V AC
-48V DC 2 V
0.5V
Volt7 +5V 36 mV
6.4.3 Fan Sensors
Fans 0, 1, and 2 are the three blowers located at the top of the card
cage. Fan 3, Fan 4, and Fan 5 each consist of a group of fans (total
of 10) located at the bottom of the card cage. In each of these lower
fan groups, if all of the fans are turning at an acceptable speed, the
sensor for that group reads 0. If any of the fans in the group are not
working, the sensor for that group will read 1. By default, a reading
of 1 on any of the digital fan sensor causes a minor alarm.
6.4.4 Power Supply Sensors
Power supply sensors detect the health of individual power supplies.
If a power supply is good, its sensor will read 0. A reading of 1
indicates that the power supply is not healthy. By default, this will
cause a major alarm.
6.4.5 IPMB Power
The +5V DC IPMB Power on the bus is regulated separately from the
rest of the CMC circuit. It is taken from +12 Vdc input and regulated
down to +5 Vdc. Optional battery backup is provided.
The IPMB Power is capable of supplying 1 ampere DC current at +5
Vdc per PICMG 2.9.
Voltage Tolerance: +5V +5%/-3% at backplane, 0A to 0.8A load or
with 500 mA hot swap transient.
The CMC board monitors its own IPMB power voltage. The IPMB
power voltage is shown as Volt7 in Table 6-1. Default SDR
Parameters. Any IPMB_PWR reading outside these thresholds will
set a Major Alarm.