Name: Fibocom L850-GL Series
Brand: Fibocom
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FIBOCOM L850-GL Series Hardware Guide Page 40 of 59

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 I/O Reset Value Pin Description Type

10 LED1# O PD

System status LED, drain output.

3.3V

23 WOWWAN# O PD

Module wakes up Host (AP)，Reserved

1.8V

48 TX_BLANKING O PD

PA blanking output, external GPS

control signal，Reserved

1.8V

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 LED1# Signal

RF function ON Low level (LED On)

RF function OFF High level (LED Off)

The LED driving circuit is shown in Figure 3-20:

Figure 3-20 LED driving circuit

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 Specifications

General