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MAX31760 tachometer not working

Category: Hardware
Product Number: MAX31760


We are using MAX31760 for our fan control.

For some reason readings from tachometer registers 0x52 - 0x55 not changes when we increasing speed of fans.

We checked signals on TACH1 and TACH2 and they ok. Square wave form 0-3v and frequency keep changing when we changing PWUN register 0x50 value.

What could cause this?