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LM80 Datasheet(PDF) 17 Page - Texas Instruments

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Part # LM80
Description  Serial Interface ACPI-Compatible Microprocessor System Hardware Monitor
PDF  35 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM80 Datasheet(HTML) 17 Page - Texas Instruments

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LM80
www.ti.com
SNIS102F – JUNE 1999 – REVISED MARCH 2013
Alternatives for Fan Inputs
Fan with Tach Pull-Up to +5V
Fan with Tach Pull-Up to +12V, or Totem-Pole Output and Resistor Attenuator
Fan with Tach Pull-Up to +12V and Diode Clamp
Fan with Strong Tach Pull-Up or Totem Pole Output and Diode Clamp
Counts are based on 2 pulses per revolution tachometer outputs.
RPM
Time per Revolution
Counts for “Divide by 2”
Comments
(Default) in Decimal
4400
13.64 ms
153 counts
Typical RPM
3080
19.48 ms
219 counts
70% RPM
2640
22.73 ms
255 counts
60% RPM
(maximum counts)
Copyright © 1999–2013, Texas Instruments Incorporated
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