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5.11 BODY_SAR Interface
L831-EA module supports BODY_SAR (DPR pin) function.
BODY_SAR is input signal (the signal is output directly by the AP end), with high level by default, and low
level is effectively. While the human nearing, AP can detect it through the distance sensor, then output the
BODY_SAR signal with low level. While the module detected the signal through the interruption, the
module `s Tx power will be reduced and the threshold value can be set by the AT commands.
Pin#
Name
25
DPR
5.12 Description of I2C Interface
L831-EA module supports one 12C interface, default configuration is I2C master. The I2C can used for
driving external 12C slave device, such as Audio codes and so on.
Pin#
Name
42
GNSS_SDA
40
GNSS_SCL
The signal connection between L831-EA module and external 12C slave device ( such as Audio Codec）
as listed below:
L831-EA
GNSS_SDA
GNSS_SCL
5.13 Clock Interface
L831-EA module supports one 26MHz clock output and one 32KHz clock output.
Pin#
Name
68
CLK32K
46
SYSCLK
5.14 Config Interface
L831-EA module provides four config pins and with the configuration of WWAN-USB3.0-0.
PIN#
Name
L831-EA Module Hardware User Manual
I/O
Description
I
BODY_SAR detection
I/O
Description
I/O
I2C control signal input/output ,1.8V signal
O
I2C control clock signal, 1.8V signal
Direction
I/O
Description
O
32K clock output ,
26Mclock output , (recommend used for external GPS, and can
O
also used as audio codec`s MCLK)
I/O
Audio Codec I2C Port
I2C_SDA
I2C_SCL
Description
Value
Page 36 of 43
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