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L830-EA M.2 Module Hardware User Manual
Page 33 of 45
If SIM_DETECT is at low level, which indicates SIM card is not inserted, the module will not register it
to the network.
Note:
the default of +MSMPD parameter is “1”.SIM_DETECT is the detection signal. While the module
first power on or plug after that, SIM_DETECT will detect if the SIM card is existing or not. Just only if the
SIM_DETECT is low level, the module will cannot read SIM card.
5.6 Digital Audio
L830-EA M.2 module supports digital audio I2S interface
④
that supports normal I2S mode and PCM
mode. I2S interface level is 1.8V on average.
I2S signal description:
Pin#
Pin Name
I/O
Description
20
I2S_CLK
O
Bit Clock
28
I2S_WA
O
Left and right channel clock (LRCK)
22
I2S_RX
I
Serial data input
24
I2S_TX
O
Serial data output
Note
④
: The digital audio interface is not supported yet.
5.6.1 I2S Interface
L830-EA M.2
Signal Direction Audio CODEC I2S Port
I2S_CLK
I2S_CLK
I2S_WA
I2S_LRCK
I2S_RX
I2S_SDOUT
I2S_TX
I2S_SDIN
Description:
I2S interface can be configured as client-server work mode.
Suitable for various audio sampling frequencies(48KHz, 44.1KHz, 32KHz, 24KHz, 22.5KHz, 16KHz,
12KHz, 11.025KHz and 8KHz).
5.6.2 PCM Port Description
L830-EA M.2
Signal Direction Audio CODEC PCM Port
I2S_CLK0(PCM_CLK ,PCM clock signal)
PCM_CLK
(
PCM clock signal
)