Clock Source MEMS

vandiwa
Posts: 1
Joined: Fri Sep 25, 2015 12:04 am

Clock Source MEMS

Postby vandiwa » Thu Mar 03, 2016 2:52 pm

I'm trying to use a MEMS oscillator to drive the clock of the ESP8266EX, but it appears that this is not working well at all. Compared to a module with a crystal, I am producting all malformed frames. The general center frequency of transmission is good, but the data in all my packets is corrupt. I've tried putting a MEMS on a working module and it won't start running with the MEMS output applied to the ESP Pin 28. It will communicate over the UART when the MEMS output is connected to pin 27, but still produces mostly corrupt RF packets. Is there some kind of feedback loop going on with the crystal so that a strict clock input is not enough to maintain the internal clock? Has anyone successfully used an external clock source to drive the ESP?

Espressif_Kelly
Posts: 140
Joined: Mon Oct 27, 2014 10:40 am

Re: Clock Source MEMS

Postby Espressif_Kelly » Thu Mar 17, 2016 11:07 am

Hi vandiwa,

Please help provide the model and the datasheet for this MEMS oscillator.

The output of the oscillator should be connected to XTAL_IN(Pin28) of ESP8266EX.

Thanks.

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