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M10 Hardware Design
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GND
TO PC serial port
SP3238
3V
GND
GND
T5OUT
/SHUTDOWN
V+
GND
V-
VCC
T4OUT
T2OUT
T3OUT
T1OUT
R3IN
R2IN
R1IN
/STATUS
3V
ONLINE
R1OUT
R2OUT
R3OUT
/R1OUT
GND
T5IN
T4IN
T3IN
T2IN
T1IN
C2+
C2-
C1-
C1+
MODULE
RXD
DTR
RTS
RI
CTS
TXD
DCD
Figure 20: RS232 level converter circuit
Note 1
:
For detail information about serial port application, please refer to document [10]
Note 2
:
The following pins (VBAT/RXD/TXD/GND/PWRKEY) must be reserved for firmware
upgrade.
3.9 Audio interfaces
The module provides two analogy input channels and two analogy output channels on these SMT
pads.
z
AIN1 and AIN2, which may be used for both microphone and line inputs.The electret
microphone is recommended when the interface used for microphone. One of the two
channels is typically used with a microphone built into a handset. The other channel is
typically used with an external microphone.AIN1 is a differential channel, AIN2 is also a
differential mode. The module analogy input configuration is determined by control register
settings and established using analogy multiplexes.
z
AOUT1 and AOUT2, which may be used for both receiver and speaker outputs. AOUT1
channel is typically used with a receiver built into a handset. AOUT2 channel is typically
used with speaker which is for headset or handsfree audio output . AOUT1 channel is a
differential channel and AOUT2 is a single-ended channel, SPK2P and AGND internal can
establish a pseudo differential mode. There isn’t any capacitor connected with SPK2P line in
the module, so the output of SPK2P is a DC voltage ,user should add a capacitor (The 22uF
M10_HD_V1.00
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Quectel