Quectel M20

M20 Hardware Design
MIC2P
MIC2N
I Audio input channel 2.
Positive and negative voice
input.
Microphone
bias voltage
supplied
internally. If
unused, keep
these pins
open.
SPK1P
SPK1N
O Audio output channel 1.
Positive and negative voice
output.
If unused
keep these
pins open.
SPK2P O Audio output channel 2.
Auxiliary voice output.
If unused
keep this pin
open.
AGND AGND is a separate ground
connection for external audio
circuit.
If unused
keep this pin
open.
General purpose input/output
PIN NAME I/O DESCRIPTION DC CHARACTERISTICS COMMENT
NETLIGHT O Network status indication VILmin=0V
VILmax=0.67V
VIHmin=1.7V
VIHmax= VDD_EXT+0.3
VOLmin=GND
VOLmax=0.34V
VOHmin=2.0V
VOHmax= VDD_EXT
If unused
keep this
open.
DAI interface
PIN NAME I/O DESCRIPTION DC CHARACTERISTICS COMMENT
RXDDAI I Receive digital audio data
TFSDAI O Frame synchronization
SCLK O Serial bit clock
TXDDAI O Transmit digital audio data
VILmin=0V
VILmax=0.67V
VIHmin=1.7V
VIHmax= VDD_EXT+0.3
VOLmin=GND
VOLmax=0.34V
VOHmin=2.0V
VOHmax= VDD_EXT
If unused
keep these
pins open.
Serial Port 0
PIN NAME I/O DESCRIPTION DC CHARACTERISTICS COMMENT
DTR0 I Data terminal ready
RXD0 I Receiving data
TXD0 O Transmitting data
RTS0 I Request to send
CTS0 O Clear to send
VILmin=0V
VILmax=0.67V
VIHmin=1.7V
VIHmax= VDD_EXT+0.3
VOLmin=GND
If only use
TXD0 and
RXD0 to
communicate,
recommend to
M20_HD_V1.01 - 20 -
Quectel