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FIBOCOM L850-GL Series Hardware Guide Page 41 of 59
3.7 Interrupt Control
The L850 module provides three interrupt signals, and the pin definition is as follows:
Pin Pin Name I/O Reset Value Pin Description Type
8 W_DISABLE1# I PD
Enable/Disable RF network
3.3/1.8V
25 DPR I PU
BodySAR detection
3.3/1.8V
26 W_DISABLE2# I PU
GNSS disable signal,
3.3/1.8V
3.7.1 W_DISABLE1#
The module provides a hardware pin to enable/disable WWAN RF function, and the function can also be
controlled by the AT command. The module enters into flight mode after the RF function is disabled. The
definition of W_DISABLE1# signal is as follows:
High/Floating WWAN function is enabled, the module exits the flight mode.
Low WWAN function is disabled, the module enters into flight mode.
Note：
The function of W_DISABLE1# is enabled by default. It can be disabled by customer’s request.
3.7.2 BODYSAR
The L850 module supports BodySAR function by detecting the DPR pin. The voltage level of DPR is high
by default, and when the SAR sensor detects the closing human body, the DPR signal will be pulled down.
As the result, the module then lowers down its emission power to its default threshold value, thus reducing
the RF radiation on the human body. The threshold of emission power can be set by the AT Commands.
The definition of DPR signal is shown in the following table:
3.8 Clock Interface
The L850 module supports a clock interface. It can output 26MHz clock.
Pin Pin Name I/O Reset Value Pin Description Type
46 SYSCLK O -
26M clock output used for external audio
codec and GNSS, etc., default disabled
1.8V
DPR signal Function
High/Floating The module keeps the default emission power
Low Lower the maximum emission power to the threshold value of the module.
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