Status Indicator; Led#1 Signal - Fibocom L850-GL Series Hardware Manual

least.
The filter capacitors and ESD devices for SIM card signals should be placed near to the SIM card slot,

and the ESD devices with 22~33pF capacitance should be used.

3.6 Status Indicator

The L850 module provides three signals to indicate the operating status of the module, and the status
indicator pins is shown in the following table:
Pin Pin Name
10 LED1#
23 WOWWAN#
48 TX_BLANKING O

3.6.1 LED#1 Signal

The LED#1 signal is used to indicate the operating status of the module, and the detailed description is
shown in the following table:
Module Status
RF function ON
RF function OFF
The LED driving circuit is shown in Figure 3-20:
Note:
The resistance of LED current-limiting resistor is selected according to the driving voltage and the
driving current.
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FIBOCOM L850-GL Series Hardware Guide
I/O Reset Value
O PD
O PD
PD
LED1# Signal
Low level (LED On)
High level (LED Off)
Figure 3-20 LED driving circuit
Pin Description
System status LED, drain output.
Module wakes up Host (AP)，Reserved 1.8V
PA blanking output, external GPS
control signal，Reserved
Type
3.3V
1.8V
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