LTE Module Series
EC25 Mini PCIe Hardware Design
EC25_Mini_PCIe_Hardware_Design Confidential / Released 26 / 42
V
IL
≤0.5V
V
IH
≥2.3V
VCC_3V3
≥150ms
Resetting
Module
Status
Running
PERST#
Restart
≤460ms
Figure 10: Timing of Resetting Module
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.
LED_WWAN#
VCC
R
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#
Description
Low Level (Light on)
Registered on network
High-impedance (Light off)
No network coverage or not registered
W_DISABLE# signal is at low level. (Disable the RF)
AT+CFUN=0
,
AT+CFUN=4
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