Quectel EC25 Mini PCIe - LED_WWAN# Signal

LTE Standard Module Series
EC25 Mini PCIe Hardware Design
EC25_Mini_PCIe_Hardware_Design 34 / 79
V
IL
≤0.5V
V
IH
≥2.3V
VCC_3V3
≥150ms
Resetting
Module
Status
Running
PERST#
Restart
≤460ms
Figure 12: Timing of Resetting Module
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.
LED_WWAN#
VCC
R
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.