LM93 datasheet(5/92 Pages) NSC

5 / 92 page

Table of Contents (Continued)

15.6 ERROR STATUS REGISTERS ............................................................................................................. 27

15.6.1 ASF Mode ........................................................................................................................................ 27

15.7 MASKING, ERROR STATUS AND ALERT ........................................................................................... 27

15.8 LAYOUT AND GROUNDING ................................................................................................................ 27

15.9 THERMAL DIODE APPLICATION ......................................................................................................... 27

15.9.1 Accuracy Effects of Diode Non-Ideality Factor ................................................................................ 28

15.9.2 PCB Layout for Minimizing Noise .................................................................................................... 28

15.10 FAN CONTROL ................................................................................................................................... 28

15.10.1 Automatic Fan Control Algorithm ................................................................................................... 28

15.10.2 Fan Control Temperature Resolution ............................................................................................ 30

15.10.3 Zone 1-4 to PWM1-2 Binding ........................................................................................................ 31

15.10.4 Fan Control Duty Cycles ............................................................................................................... 31

15.10.5 Alternate PWM Frequencies .......................................................................................................... 31

15.10.6 Fan Control Priorities ..................................................................................................................... 31

15.10.7 PWM to 100% Conditions ............................................................................................................. 31

15.10.8 VRDx_HOT Ramp-Up/Ramp-Down .............................................................................................. 32

15.10.9 PROCHOT Ramp-Up/Ramp-Down ............................................................................................... 32

15.10.10 Manual PWM Override ................................................................................................................ 32

15.10.11 Fan Spin-Up Control .................................................................................................................... 32

15.11 XOR TREE TEST ................................................................................................................................ 33

16.0 Registers .................................................................................................................................................. 34

16.1 REGISTER WARNINGS ....................................................................................................................... 34

16.2 REGISTER SUMMARY TABLE ............................................................................................................. 34

16.3 FACTORY REGISTERS 00h–3Fh ........................................................................................................ 40

16.3.1 Register 00h

XOR Test ................................................................................................................. 40

16.3.2 Register 01h

SMBus Test ............................................................................................................. 40

16.3.3 Register 3Eh

Manufacturer ID ...................................................................................................... 40

16.3.4 Register 3Fh

Version/Stepping ..................................................................................................... 40

16.4 BMC ERROR STATUS REGISTERS 40h–47h .................................................................................... 41

16.4.1 Register 40h

B_Error Status 1 ...................................................................................................... 41

16.4.2 Register 41h

B_Error Status 2 ...................................................................................................... 42

16.4.3 Register 42h

B_Error Status 3 ...................................................................................................... 42

16.4.4 Register 43h

B_Error Status 4 ...................................................................................................... 43

16.4.5 Register 44h

B_P1_PROCHOT Error Status ............................................................................... 43

16.4.6 Register 45h

B_P2_PROCHOT Error Status ............................................................................... 44

16.4.7 Register 46h

B_GPI Error Status .................................................................................................. 44

16.4.8 Register 47h

B_Fan Error Status .................................................................................................. 45

16.5 HOST ERROR STATUS REGISTERS .................................................................................................. 45

16.5.1 Register 48h

H_Error Status 1 ...................................................................................................... 45

16.5.2 Register 49h

H_Error Status 2 ...................................................................................................... 46

16.5.3 Register 4Ah

H_Error Status 3 ..................................................................................................... 47

16.5.4 Register 4Bh

H_Error Status 4 ..................................................................................................... 48

16.5.5 Register 4Ch

H_P1_PROCHOT Error Status ............................................................................... 49

16.5.6 Register 4Dh

B_P2_PROCHOT Error Status ............................................................................... 50

16.5.7 Register 4Eh

H_GPI Error Status ................................................................................................. 51

16.5.8 Register 4Fh

H_Fan Error Status ................................................................................................. 52

16.6 VALUE REGISTERS ............................................................................................................................. 52

16.6.1 Registers 50–53h

Unfiltered Temperature Value Registers ......................................................... 52

16.6.2 Registers 54–55h

Filtered Temperature Value Registers ............................................................. 52

16.6.3 Register 56–65h

A/D Channel Voltage Registers ........................................................................ 53

16.6.4 Register 67h

Current P1_PROCHOT ........................................................................................... 53

16.6.5 Register 68h

Average P1_PROCHOT .......................................................................................... 54

16.6.6 Register 69h

Current P2_PROCHOT ........................................................................................... 54

16.6.7 Register 6Ah

Average P2_PROCHOT ......................................................................................... 54

16.6.8 Register 6Bh

GPI State ................................................................................................................. 55

16.6.9 Register 6Ch

P1_VID .................................................................................................................... 55

16.6.10 Register 6Dh

P2_VID .................................................................................................................. 55

16.6.11 Register 6E–75h

Fan Tachometer Readings .............................................................................. 56

16.7 LIMIT REGISTERS ................................................................................................................................ 57

16.7.1 Registers 78–7Fh

Temperature Limit Registers ........................................................................... 57

16.7.2 Registers 80–83h

Fan Boost Temperature Registers .................................................................. 57

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