Please note if the headphone you select is A-type or B-type. The connections of ① and ② are reversed
for the two type of headphones. The HPH_DET pin (⑤ in the above figure) is not connected (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.
PCB Design Guidelines
⚫
The audio signal traces should be wide enough on the PCB to bear large current when audios
are outputted at the highest volume. Isolate the traces from high-speed digital signals and clocks
as well as other analog signal traces. No signal trace crossing is allowed. Reserve enough
grounding holes and ground protection.
⚫
Keep audio traces far away from antenna to reduce jamming. Avoid parallel layout between
power supply traces and audio traces.
⚫
It is important to route the audio signal traces as differential pairs.
5.5 Video Interfaces
5.5.1 LCD
N715-EA provides an LCD-dedicated SPI interface, supporting frame rates up to QVGA@30fps. The
following shows the LCD interface description. The following shows the LCD interface pin description.
Table 5-3 LCD interface pin description
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