User's Manual

M50 Hardware Design
M50_HD_V2.0 - 24 -
MIC2P
MIC2N
7, 8 I Channel two for
positive and
negative voice-band
input
SPK1P
SPK1N
12, 11 O Channel one for
positive and
negative voice-band
output
1. If unused,
keep these pins
open.
2. Support both
voice and
ringtone output.
SPK2P 5 O Channel two for
voice-band output
AGND 6 Analog ground.
Constitute a pseudo
differential channel
with SPK2P.
LOUDSPKN
LOUDSPKP
13,
14
O Channel three of
positive and
negative voice-band
output
1. If unused,
keep these pins
open.
2. Embedded
amplifier of class
AB internally.
3. Support both
voice and
ringtone output.
Net status indicator
PIN NAME PIN
NO.
I/O DESCRIPTION DC
CHARACTERISTICS
COMMENT
NETLIGHT 4 O Network status
indication
VOHmin=
0.85×VDD_EXT
VOLmax=
0.15×VDD_EXT
If unused, keep
this pin open.
UART Port
PIN NAME PIN
NO.
I/O DESCRIPTION DC
CHARACTERISTICS
COMMENT
DTR 47 I Data terminal ready VILmin=0V
VILmax=
0.25×VDD_EXT
VIHmin=
0.75×VDD_EXT
VIHmax=
VDD_EXT+0.3
VOHmin=
0.85×VDD_EXT
VOLmax=
If only use TXD,
RXD and GND
to communicate,
recommend
pulling down
RTS and keeping
other pins open.
RXD 50 I Receive data
TXD 49 O Transmit data
RTS 51 I Request to send
CTS 48 O Clear to send
RI 46 O Ring indicator
DCD 45 O Data carrier
detection
Quecctel
Confidential