L831-EA Module Hardware User Manual
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configuration of data transmission.
Supports various audio sample rates (48KHz,44.1KHz,32KHz, 24KHz,22.5KHz,16KHz,12KHz,8KHz,
11.025KHz).
Note: Cause the timing of I2S modes is easier than PCM modes and easier to fit, recommend clients to
use transmission audio of I2S mode. While transmission with PCM modes, the PCM timing sequence is
difficult to fit to make the tone quality become bad.
5.7 Android/Win8Dual System Switch Control Interface
L831-EA module supports Win8/Android dual system switch, check and achieve the dual system switch
through interrupt signal ”GNSS_IRQ”.
Pin#
Name
I/O
Description
44
GNSS_IRQ
I
Win8/Android dual system switch detection signal,
CMOS 1.8V
The function definition of GNSS_IRQ signal as listed below:
No.
GNSS_IRQ
Function
1
High/Floating
Support Win8 system, the module`s USB ports shall set as MBIM modes.
2
Low
Support Android system, the module`s `USB ports shall set as
3ACM modes.
Description:
1. Check and achieve the Win8/Android system switch through GNSS_IRQ level when the module
power on. Keep the GNSS_IRQ level stability during booting.
2. Check and achieve the Win8/Android system switch through GNSS_IRQ rising edge/ falling edge
while the module power on, the de-bouncing time sets as 100ms. The module will reboot after
meeting the requirements and can switch different system supports.
5.8 W_DISABLE# Interface
5.8.1 Description of WWAN_DISABLE# Interface
L831-EA module provides through hardware to open/close the WWAN RF function signal, this function
can also controlled by AT commands.
Pin#
Name
I/O
Description
8
W_DISABLE1#
I
WWAN open/close signal ,CMOS 3.3V
The definition of W_DISABLE# signal as listed below:
