Texas Instruments LM96080 Evaluation Board LM96080EB/NOPB LM96080EB/NOPB Datenbogen
Produktcode
LM96080EB/NOPB
SNAS465D – SEPTEMBER 2009 – REVISED MARCH 2013
Alternatives for Fan Inputs
Figure 15. Fan with Tach Pull-Up to +5V
Figure 16. Fan with Tach Pull-Up to +12V, or Totem-Pole Output and Resistor Attenuator
Figure 17. Fan with Tach Pull-Up to +12V and Diode Clamp
Figure 18. Fan with Strong Tach Pull-Up or Totem Pole Output and Diode Clamp
The table below shows example calculation for Count with different divisor and frequency. Counts are based on 2
pulses per revolution tachometer outputs.
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)
18
Copyright © 2009–2013, Texas Instruments Incorporated
Product Folder Links: