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NXQ1TXH5 CNF_IN and LED Red/Green not working

Question asked by Labib Lartey on Aug 13, 2019
Latest reply on Aug 14, 2019 by Jose Alberto Reyes Morales

I have made a custom PCB board with an NXQ1TXH5. Wireless charging is working, however at quite low current being supplied to the receiver coil. Investigating the board shows that CNF_IN goes between VDD (~5V rail) and 0V, even though the resistor network is present and should work as a potential divider.


I have been following the app note AN117755 and have varied the resistance values of CNF1-4 which has resulted in absolutely no change in the response of CNF_IN. It continues to pulse to 0V from VDD every ~3secs. 


As a result I cannot set the LED Mode and therefore have both Red and Green floating. Anyone seen these issues before on CNF_IN and/or LED Red/Green?