Posts: 1
Registered: ‎02-21-2017
Accepted Solution


The data sheet for the Si2401 modem chip indicates that this modem can be used to detect and decode DTMF tones on the telephone line; however there is no clear procedure for implementing this function. What is the procedure for detecting DTMF tones with this chip?

Posts: 113
Registered: ‎09-15-2015

Re: Si2401

The Si2401 DTMF detection may not be suitable for applications where the DTMF tones are mixed in with voice or noise. Depending on your usage case, the Si2439 may be more suitable as it has been tested against many different use cases. Another way of putting this is that the DTMF detector of the Si2439 is much more robust. Rather than having you spend your time evaluating the Si2401, then finding that it may not be suitable for what your application, please consider using the Si2439 instead for your application instead.