User Manual

GSM/GPRS Module Series
GC10 Hardware Design
GC10_Hardware_Design Confidential / Released 18 / 76
EMERG_
OFF 40 I
Emergency off. Pulled
down for at least 10ms,
which will turn off the
module in case of
emergency. Use it only
when shutdown via
PWRKEY or AT
command cannot be
achieved.
VILmax=
0.3×VDD_EXT
VIHmin=
0.7×VDD_EXT
Pulled up to VDD_EXT
internally. OC/OD
driver required in
cellular device
application. If unused,
keep this pin open.
Module Indicator
Pin Name
Pin
NO.
I/O Description DC Characteristics Comment
NETLIGHT 14 O Network status indication
VOLmin=0V
VOLmax=
0.3×VDD_EXT
VOHmin=
0.7×VDD_EXT
VOHmax=
VDD_EXT
If unused, keep this
pin open.
Audio Interfaces
Pin Name
Pin
NO.
I/O Description DC Characteristics Comment
MIC1P
MIC1N
19,20 I
Channel 1 positive and
negative voice input
For Audio DC
characteristics refer
to Chapter 3.9.
Main audio channel.
Recommended to add
ESD protection
components at the
MIC1P/N lines. If
unused, keep these
pins open.
SPK1P
SPK1N
21,22 O
Channel 1 positive and
negative voice output
MIC2P
MIC2N
17,18 I
Channel 2 positive and
negative voice input
Auxiliary audio
channel.
Recommended to add
ESD protection
components at the
MIC2P/N lines. If
unused, keep these
pins open.
SPK2P 16 O
Channel 2 single-ended
voice output
AGND 15 Audio analog ground.
Separate ground
connection for external
audio circuits.