Voltage spikes during hot-plugging can permanently damage the Cx31993 controller.
Using the datasheet-recommended 2.2kΩ resistor can cause clipping or failure to detect standard smartphone headsets. Cx31993 Datasheet Fix
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These capacitors must be placed within 1.5mm of the VREF pin, grounding directly to a solid, uninterrupted analog ground plane (AGND). This suppresses high-frequency switching noise from the internal charge pump. Try again later
Most physical failures of CX31993 dongles stem from cost-cutting measures in PCB layout design or misreading the pinout instructions. The Missing Decoupling Capacitor Fix