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LM93 Datasheet(PDF) 59 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) 59 Page - Texas Instruments

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LM93
www.ti.com
SNAS210E – DECEMBER 2003 – REVISED MARCH 2013
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
75h
R
4
TACH4[13:6]
N/D
MSB
The 14-bit fan tach readings indicate the number of 22.5 kHz clock periods that occurred during two full
periods of the tachometer input signal. Most fans produce two tachometer pulses per full revolution. These
registers must be updated at least once every second.
The fan tachometer reading registers must always return an accurate fan tachometer measurement, even
when a fan is disabled or non-functional. 3FFFh indicates that the fan is stalled, not spinning fast enough
to measure, or the tachometer input is not connected to a valid signal.
If the pulses per revolution of the fan is known, the RPM can be calculated with the following equation:
RPM= 22500 cycles/sec * 60 sec/min * 2 pulses / COUNT cycles / PULSES_PER_REV
where:
•
PULSES_PER_REV = the number of pulses that the fan produces per revolution
•
COUNT = The 14-bit value read from the tach register
(8)
3.17.7 LIMIT REGISTERS
3.17.7.1 Registers 78–7Fh
Temperature 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
Processo
r 1
78h
R/W
(Zone1)
7
6
5
4
3
2
1
0
80h
Low
Temp
Processo
r 1
79h
R/W
(Zone1)
7
6
5
4
3
2
1
0
80h
High
Temp
Processo
r 2
7Ah
R/W
(Zone2)
7
6
5
4
3
2
1
0
80h
Low
Temp
Processo
r 2
7Bh
R/W
(Zone2)
7
6
5
4
3
2
1
0
80h
High
Temp
Internal
(Zone3)
7Ch
R/W
7
6
5
4
3
2
1
0
80h
Low
Temp
Internal
(Zone3)
7Dh
R/W
7
6
5
4
3
2
1
0
80h
High
Temp
External
Digital
7Eh
R/W
(Zone4)
7
6
5
4
3
2
1
0
80h
Low
Temp
External
Digital
7Fh
R/W
(Zone4)
7
6
5
4
3
2
1
0
80h
High
Temp
Copyright © 2003–2013, Texas Instruments Incorporated
Functional Description
59
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Product Folder Links: LM93



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