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BQ79614-Q1: BQ79614-Q1

Guillaume Degroote
Prodigy 100 points
Part Number: BQ79614-Q1
Other Parts Discussed in Thread: USB2ANY

Hi,

I have a problem where communication is not working on my stack devices.

I had it working before but suddenly some stack modules are only listening to wake tone and then wont turn off again until i fully disconnect them from the battery. 

I have the evaluation board and usb2any connector. I checked connections and have the correct voltage on the LDOIN pin, on VC pins I also have the correct voltage. 

My setup i use to connect comm high and comm low are with isolation capacitors and 2 common mode chokes in series.

Do you guys have any tips to solve or find the problem. because i already have 3 chips with not fully working communication it seems like.

Edit:

Normally I leave the UART unconnected (RX connected with CVDD and TX floating). Now i tried to debug the module by connecting the UART again and everything seems to work fine again after i connected the the UART. even the differential communication suddenly started workign again on the different modules. Is here an explanation for? Is there something I am missing from the datasheet?