Led_Wwan# Signal - Quectel EC25 Hardware Design

3.8.5. LED_WWAN# Signal

The LED_WWAN# signal of EC25 Mini PCIe is used to indicate the network status of the module, which
can absorb the 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 active low.
Figure 11: LED_WWAN# Signal Reference Circuit Diagram
The following table shows the network status indications of the LED_WWAN# signal.
Table 12: Indications of Network Status
LED_WWAN#
Low Level (Light on)
High-impedance (Light off)
EC25_Mini_PCIe_Hardware_Design
VCC_3V3
≥150ms
PERST#
Module
Running
Status
Figure 10: Timing of Resetting Module
LED_WWAN#
Description
Registered on network

No network coverage or not registered

W_DISABLE# signal is at low level. (Disable the RF)

AT+CFUN=0, AT+CFUN=4
EC25 Mini PCIe Hardware Design
≤460ms
≥2.3V
V
IH
≤0.5V
V
IL
Resetting
Restart
R
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VCC
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