Product Info

LTE Module Series
EG21-G MINIPCIE Hardware Design
EG21-G_MINIPCIE_Hardware_Design 27 / 48
Table 12: Airplane Mode Controlled by Software Method
3.8.4. PERST# Signal
The PERST# signal can be used to force a hardware reset on the card. Customers can reset the module
by driving the PERST# to a low level voltage with the time frame of 150ms~460ms and then releasing it.
The reset scenario is illustrated in the following figure.
V
IL
≤0.5V
V
IH
≥2.3V
VCC_3V3
≥150ms
Resetting
Module
Status
Running
PERST#
Restart
≤460ms
Figure 11: Timing of Resetting Module
3.8.5. LED_WWAN# Signal
The LED_WWAN# signal of EG21-G MINIPCIE is used to indicate the network status of the module, and
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 12: LED_WWAN# Signal Reference Circuit Diagram
AT+CFUN=?
RF Function status
Module Operation mode
Conditions
0
RF and (U)SIM disabled
Minimum functionality mode
Keep W_DISABLE# at
high level.
1
RF enabled
Normal mode
4
RF disabled
Airplane mode