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CPCI-810 User’s Manual
Revision 1.1, June 2001
Figure 3-2. POWER SUPPLY #1 STATUS REGISTER (READ ONLY)
3.6
FAN MONITORING
Two circuits are provided for the monitoring of two fan frequencies inputs. As in the case of the power
supply monitoring signals, additional inputs to J2 have been defined for the two fan inputs. Refer to
Appendix B for their pin locations. The fan monitoring circuits will provide an interrupt to the
processor if the frequency of the fan output falls below approximately 8K RPM. Green LEDs are
provided for fan interrupt status. If a fan frequency input causes an interrupt, the corresponding LED is
turned off. Figure 3-3. shows the register bit definition for the fan status register.
Figure 3-3. FAN STATUS REGISTER (READ ONLY)
PS1 Failed (1)
PS1 Detected
(Read Only)
7
6
5
4
3
2
1
0
Fan 0
Fan 1
(Read Only)
(1) Failed
7
6
5
4
3
2
1
0
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