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LM93 Datasheet(PDF) 63 Page - Texas Instruments

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Part # LM93
Description  Hardware Monitor with Integrated Fan Control for Server Management
PDF  95 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM93 Datasheet(HTML) 63 Page - Texas Instruments

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LM93
www.ti.com
SNAS210E – DECEMBER 2003 – REVISED MARCH 2013
SPACER
UPPER_OFFSET1 or
Upper Offset
UPPER_OFFSET2
0h
12.5 mV
1h
25 mV
2h
37.5 mV
3h
50 mV
~ ~
~ ~
Dh
175 mV
Eh
187.5 mV
Fh
200 mV
3.17.7.6 Register B4–BBh
Fan Tach Limit Registers
Register
Read/
Register
Default
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Address
Write
Name
Value
Fan Tach
RES
B4h
R/W
1
TLIMIT1[5:0]
FCh
Limit LSB
Fan Tach
1
B5h
R/W
TLIMIT1[13:6]
FFh
Limit
MSB
Fan Tach
B6h
R/W
2
TLIMIT2[5:0]
RES
FCh
Limit LSB
Fan Tach
2
B7h
R/W
TLIMIT2[13:6]
FFh
Limit
MSB
Fan Tach
B8h
R/W
3
TLIMIT3[5:0]
RES
FCh
Limit LSB
Fan Tach
3
B9h
R/W
TLIMIT1[13:6]
FFh
Limit
MSB
Fan Tach
BAh
R/W
4
TLIMIT4[5:0]
RES
FCh
Limit LSB
Fan Tach
4
BBh
R/W
TLIMIT4[13:6]
FFh
Limit
MSB
If a tachometer reading exceeds its limit (as defined by these registers) the corresponding bit is set in the
Host and BMC Error Status registers. The fan tachometer readings can be associated with a particular
PWM output, but the tach errors are not automatically masked when a PWM is at 0% or set to level that
causes the fan RPM to be below the limit purposely. In order to prevent false errors, care needs to be
taken to make sure that the Fan Tach Limits are properly set. Errors are never generated for a fan if its
limit is set to 3FFFh.
Copyright © 2003–2013, Texas Instruments Incorporated
Functional Description
63
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Product Folder Links: LM93



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