User's Manual
Table Of Contents
- Copyright
- Attention
- Trademark
- Versions
- Foreword
- Product Overview
- Structure
- Hardware Introduction
- Hardware Interface
- Power Interface
- Power on/off and Reset Signal
- Status Indicating Signal
- USB /SSIC Interface
- USIM Interface
- Digital Audio
- Win8/Android Switch Control Interface
- W_DISABLE# Interface
- TX_BLANKING Interface
- WAKEUP_Host Interface
- BODY_SAR Interface
- I2C Interface
- Clock Interface
- Config Interface
- RF Interface
- Other Interfaces
- Electrical and Environmental Features
- RF Interface
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）