Mobiletek LYNO L710, Руководство пользователя

Страница: 17 / 35

L710 EVB User Manual
Copyright© Shanghai Mobiletek Communication Ltd
15
Figure5-7: Function module load plate and antenna interface
Note: L710 has only one main antenna interface, and the user can only use ANT_MAIN as
the antenna interface when it is actually used.
5.8 Audio interface
（
TBD
）
The L710 module supports 1-channel PCM channel, which can also be reused as I2S signal. When
using, switch S2 and S3 are needed to cooperate. The switch S2 is a software and hardware switch.
When switching S2 to the top, the software can pull GPIO25 high level to make the power supply
and crystal vibration of CODEC; When switching S2 to the bottom, the hardware automatically
enables the power and crystal oscillator of CODEC. The switch S3 is the selection switch of
CODEC. When switching S3 to the top, CODEC uses MAX chip. When using the
MAX chip, the sound comes from the earphone, the Chinese standard earphone needs to
be plugged in. Switch S3 to the bottom, the CODEC chip is NUA8814. At this time, the sound
comes from the SPK end, and 8 ohm horn can be welded to the SPK end. Toggle switch as shown
in the figure below:
Figure5-8: CODEC SWITCH S2 S3
The default audio solution on EVB development board is NAU8814, so the external audio channel