Perst# Signal; Led_Wwan# Signal - Quectel UC200T-GL Hardware Design

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3.10.4. PERST# Signal

The PERST# signal can be used to force a hardware reset on the card. Customers can reset the module
by driving PERST# signal low for more 300ms and then releasing it. The reset scenario is illustrated in the
following figure.
VCC_3V3
PERST#
Module
Status

3.10.5. LED_WWAN# Signal

The LED_WWAN# signal of UC200T-GL 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
UC200T-GL_Mini_PCIe_Hardware_Design
RF disabled
≥300ms
V
≤0.5V
IL
Running
Baseband resetting
Figure 12: Timing of Resetting Module
UMTS/HSPA+ Standard Module Series
UC200T-GL Mini PCIe Hardware Design
Airplane mode
Baseband restart
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