Quectel Wireless Solutions Company Limited 201404UC15M User Manual
UMTS/HSDPA Module Series
UC15 Mini PCIe Hardware Design
UC15_Mini_PCIe_Hardware_Design Confidential / Released 30 / 40
3.8.2. PERST# Signal
The PERST# signal can be used to force a hardware reset on the card. You can reset the module by
driving the PERST# to a low level voltage for 0.05~0.2s and then release it. The reset scenario is
illustrated in the following figure.
V
IL
≤ 0.35V
V
IH
≥ 2.3V
VCC_3V3
0.05~0.2s
RESETTING
Module
Status
Status
RUNNING
PERST#
RUNNING
≥ 5s
Figure 16: Timing of Resetting Module
3.8.3. LED_WWAN# Signal
The LED_WWAN# signal of UC15 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 17: Reference Circuit of LED_WWAN#
The following table shows the indications of network status of the LED_WWAN# signal.
High Level
AT+CFUN=0
AT+CFUN=4
Disabled
Low Level
AT+CFUN=0
AT+CFUN=1
AT+CFUN=4
Disabled