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LM96163: How to calculate RPM for tach count

Part Number: LM96163


Hello Team,

Let me ask you how to calculate RPM from the tacho count.
The datasheet shown an example calculation at ’Computing RPM of the fan from the TACH count’.
In the example, it seems to include 0x46[1:0], but Register 0x46[1:0] is the tachometer Edge count.
Is it correct to include Register 0x46[1:0]?

And is it correct to understand that Tach_Count_multiple is not required to calculate RPM from the TACH Count? 

Best regards,

Sato