MAX31760 tachometer not working

Question

Hello, 
 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? 
 Thanks,

GenevaC · Accepted Answer

Thank you for your inquiry. 
 For support regarding this product, please visit one of the technical support pages on our website below for assistance. 
 EN - https://www.analog.com/en/support/technical-support.html# CN - https://support.analog.com/zh-CN/technical-support/ JP - https://support.analog.com/ja-JP/technical-support/ 
 Also, here is the link to the MAX31760 datasheet that may help in the meantime.)

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MAX31760 tachometer not working

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