Quectel Wireless Solutions Company Limited 201404UC15M User Manual
UMTS/HSDPA Module Series
UC15 Mini PCIe Hardware Design
UC15_Mini_PCIe_Hardware_Design Confidential / Released 29 / 40
You can use AT+QMIC to adjust the input gain level of microphone, use AT+CLVL to adjust the output
gain level of receiver and speaker. AT+QSIDET is to set the side-tone gain level. For more details, please
refer to document [2].
The 33pF capacitors and 10pF capacitors are applied for filtering out 850/900/1800/1900MHz RF
interference. However, the self-resonant frequency point of capacitor largely depends on the material and
production technique. Therefore, you should depend on the capacitor vendor to choose the most suitable
capacitor for filtering out GSM850, EGSM900, DCS1800 and PCS1900 separately.
In order to decrease radio or other signal interference, RF antenna should be kept away from audio
interface and audio alignment. Power alignment and audio alignment should not be parallel, and power
alignment should be far away from audio alignment. The differential audio traces should be placed
according to the differential signal layout rules.
3.8. Control Signals
The following table shows the pin definition of control signals.
Table 14: Description of Control Signal Pins
3.8.1. W_DISABLE# Signal
UC15 Mini PCIe provides W_DISABLE# signal to disable wireless communications through hardware
operation. The following table shows the radio operational states of module. Please refer to document [2]
for related AT commands.
Table 15: Radio Operational States
Pin No.
Pin Name
I/O
Power Domain
Description
20
W_DISABLE#
DI
3.3V
Disable wireless communications. Active
low.
22
PERST#
DI
3.3V
Functional reset to the card. Active low
pulse.
42
LED_WWAN#
OC
—
Active-low LED signal for indicating the
state of the card.
W_DISABLE#
AT Commands
Radio Operation
High Level
AT+CFUN=1
Enabled