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SIM548C Hardware Design
GPS_VANT
GPS_VCC_RF
GND
Dual serial interface
PIN NAME
GPS_TXA
GPS_RXA
GPS_TXB
GPS_RXB
Control signals
PIN NAME
GPS_BOOTSEL
GPS_M-RST
GPS_TimeMark
SIM548C_HD_V1.01
I
The external DC power supply for an
active GPS antenna. It's input voltage
depends on the type of chosen active
antenna, for the 5V type, it has to be
connected to 5V external power
supply; for the 3V type, it can be
connected to the GPS_VCC_RF pin
directly which provides 2.85V DC.
O
The optional power supply for 3.0V
type active antenna.
Ground, shared with GSM part
I/O
DESCRIPTION
O
Serial data output for port A
I
Serial data input for port A
O
Serial data output for port B
I
Serial data input for port B
I/O
DESCRIPTION
I
For re-programming the Flash, it
must be set to High
I
Reset pin, active low. If used, it
causes the module to reset; if not
used, leave it open .
O
1
PPS
timemark
synchronizing
microsecond of GPS time.
65
Imax=25mA
Vmax=5V
Vmin=2.85V
Vmax=2.9V
Vmin=2.8V
Vnorm=2.85V
Imax=25mA
DC CHARACTERISTICS
VILmin=-0.3V
VILmax=0.84V
VIHmin=1.96V
VIHmax= 3.1
VOLmin=GND
VOLmax=0.7V
VOHmin=2.1V
VOHmax=2.8V
Note, if this pin is pulled
down by a GPIO, then the
GPIO
capability
1.5mA current.
output
for
If not used, leave it open.
to
within
1
must
have
the
of
inputting
09.05.2008
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