UMTS/HSPA+ Standard Module Series
UC200T-GL Mini PCIe Hardware Design
UC200T-GL_Mini_PCIe_Hardware_Design 30 / 51
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.
V
IL
≤
0.5V
Module
Status
Running
PERST#
Baseband restart
Baseband resetting
≥
300ms
VCC_3V3
Figure 12: Timing of Resetting Module
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
4
RF disabled
Airplane mode
