N1_Hardware_User_Guide
Copyright © Neoway Technology Co., Ltd
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Please note if the headphone is CTIA or OMTP. The connections of
①
and
②
are reverse for the two
type of headphones. The CDC_HS_DET pin (
⑤
in the above figure) is left unconnected (pulled up
internally) if the headphone is not plugged. After the headphone is plugged, this pin is connected to GND
through the left channel (8/16/32 Ω) loudspeaker of the headphone.
5.4 Audio Design Precautions
The audio signal traces should be wide enough on the PCB to bear large current when the module outputs
audio at the highest volume.
The traces should be isolated from digital signals and clock as well as other analog signal traces.
No
signal trace crossing is allowed.
Reserve enough grounding holes and ground protection.
Do not connect the audio output pins to GND.
Antennas should be located far away from audio components and traces to reduce radiation interference.
