User's Manual

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L850-GL Hardware User Manual Page
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3.7.3 TX_BLANKING
When the module operates in LTE TDD Band 39, TX_BLANKING outputs the pulse signal synchronous
with TDD burst TX timing.
As TDD TX may interfere the receiving of GPS signal, AP will disable GPS or stop GPS data receiving
when detecting TX_BLANKING pulse signal, so as to avoid abnormal operation of GPS.
Operating Mode of Module
TX_BLANKING Signal
Default state
Low level
TDD burst TX(Band38)
Output the pulse signal synchronous with TDD burst TX
TX_BLANKING timing is shown in Figure 3-16:
Figure 3-16 TX_BLANKING Timing
3.8 Interrupt Control
The L850 module provides four 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
CMOS 3.3V
25
DPR
I
PU
Body SAR detection
CMOS 1.8V
26
W_DISABLE2#
I
PU
GNSS Disablesignal,
Reserved
CMOS 1.8V
44
GNSS_IRQ
I
PD
GNSS Interrupt Request,
Reserved
CMOS 1.8V
3.8.1 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 the Flight mode afterthe RF function is disabled. The
definition of W_DISABLE1# signal is as follows:
W_DISABLE1# signal
Function
High/Floating
WWAN function is enabled, the module exits the Flight mode.
Low
WWAN function is disabled, the module entersFlight mode.