frequency counter with I2C interface

[wat007]

Hi All,
I would like to read the speed of 8 fans. Any partnumber of ICs that has I2C interface that can do the job? I have been searching for parts but cannot find it.

Thanks,
Regards,
wat007

 

[schmitt trigger]

How do you plan to sense the speed? with the tach output some fans have?

The tach output is a digital pulse that you can feed directly to a microcontroller input and read with the internal counter.
You may select a micro with enough I/O pins, or use a front end multiplexer like the CD4051 if you want to use a smaller micro.

That microcrocontroller can then become an I2C slave that will feed the fan data to upon request.

 

[wat007]

Thanks. I am considering that option also but I am looking for a separate ICs that counts the pulse with I2C bus to minimized parts and easy implementation.

Thanks for your reply.

 

[schmitt trigger]

When Philips still owned the semiconductor division, prior to it becoming NXP, they used to have a list of "approved" I2C devices, both their own devices and third party offerings.
This was required to maintain a semblance of order for the addresses.

They may still have a similar list. have you searched the NXP website?

 

[wat007]

No, cannot find it. So probably stick with MUX to micro solution. Thanks again for the help.