SimCom SIM548C HD V1.01 Hardware Design page 20

SIM548C Hardware Design
GND
Power on or power off
PIN NAME
PWRKEY
Audio interface
PIN NAME
MIC1P
MIC1N
MIC2P
MIC2N
SPK1P
SPK1N
SPK2P
SPK2N
BUZZER
AGND
Display interface
DISP_DATA
DISP_CLK
DISP_D/C
DISP_CS
DISP_RST
GERNERAL PURPOSE input/output
PIN NAME
NETLIGHT
STATUS
GPIO0
GPIO1
SIM548C_HD_V1.01
Digital ground
I/O DESCRIPTION
Voltage input
I
PWRKEY should be pull low
power on or power off the system.
The user should keep pressing the
key for a moment when power on or
power off the system. because the
system need margin time in order to
assert the software.
I/O DESCRIPTION
I Positive and negative voice-band
input
I Auxiliary positive
voice-band input
O Positive and negative voice-band
output
O Auxiliary positive
voice-band output
O Buzzer output
Analog ground
I/O LCD display interface
O
O
O
O
I/O DESCRIPTION
O Network status indication
O Another indication for system on/off
I/O General purpose input/output port
I/O General purpose input/output port
20
DC CHARACTERISTICS
for PWRKEY. VILmax=0.2*VBAT
to VIHmin=0.6*VBAT
VImax=VBAT
DC CHARACTERISTICS
Audio DC Characteristics
refer to chapter 3.9.4
and negative
and negative
VILmin=0V
VILmax=0.9V
VIHmin=2.0V
VIHmax= 3.2V
VOLmin=GND
VOLmax=0.2V
VOHmin=2.7V
VOHmax=2.9V
DC CHARACTERISTICS
VILmin=0V
VILmax=0.9V
VIHmin=2.0V
VIHmax= 3.2V
VOLmin=GND
VOLmax=0.2V
VOHmin=2.7V
VOHmax=2.9V
09.05.2008