User's Manual

M50 Hardware Design
M50_HD_V2.0 - 23 -
62,
64,
65,
66,
Turn on/off
PIN NAME PIN
NO.
I/O DESCRIPTION DC
CHARACTERISTICS
COMMENT
PWRKEY 15 I Turn on/off control.
PWRKEY should be
pulled down for a
moment to turn on
or off the system.
VILmax=
0.1×VBAT
VIHmin=
0.6×VBAT
VI max=V B AT
Pulled up to
VBAT internally.
Emergency shutdown
PIN NAME PIN
NO.
I/O DESCRIPTION DC
CHARACTERISTICS
COMMENT
EMERG_OFF 17 I Emergency off.
Pulled down for at
least 20ms, which
will turn off the
module in case of
emergency. Use it
only when normal
shutdown through
PWRKEY or AT
command cannot
perform well.
VILmax=0.4V
VIHmin=2.2V
V
open
max=2.8V
Open
drain/collector
driver required in
cellular device
application.
If unused, keep
this pin open.
Module indicator
PIN NAME PIN
NO.
I/O DESCRIPTION DC
CHARACTERISTICS
COMMENT
STAT US 16 O Indicate module
operating status.
High level indicates
module is power-on
and low level
indicates
power-down.
VOHmin=
0.85×VDD_EXT
VOLmax=
0.15×VDD_EXT
If unused, keep
this pin open.
Audio interface
PIN NAME PIN
NO.
I/O DESCRIPTION DC
CHARACTERISTICS
COMMENT
MIC1P
MIC1N
9, 10 I Channel one for
positive and
negative voice-band
input
If unused, keep
these pins open.
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