Led_Wwan# Signal - Quectel EC25 Mini PCIe Hardware Design

3.10.5. LED_WWAN# Signal

The LED_WWAN# signal of EC25 Mini PCIe is used to indicate the network status of the module, and can
absorb a current up to 40mA. According to the following circuit, in order to reduce the current of the LED,
a resistor must be placed in series with the LED.
The LED is emitting light when the LED_WWAN# output signal is low.
Figure 13: LED_WWAN# Signal Reference Circuit Diagram
There are two indication modes for LED_WWAN# signal to indicate network status, which can be
switched through following AT commands:

AT+QCFG="ledmode",0 (Default setting)

AT+QCFG="ledmode",2
The following tables show the detailed network status indications of the LED_WWAN# signal.
EC25_Mini_PCIe_Hardware_Design
VCC_3V3
≥150ms
PERST#
Module
Running
Status
Figure 12: Timing of Resetting Module
LED_WWAN#
LTE Standard Module Series
EC25 Mini PCIe Hardware Design
≤460ms
≥2.3V
V
IH
≤0.5V
V
IL
Resetting
Restart
R
VCC
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