13
MEB-1000 User Manual
software.
RXB
This is the auxiliary receiving channel and is used to input differential
corrections to the board to enable DGPS navigation.(Option)
TXA
This is the main transmitting channel and is used to output navigation and
measurement data to PowerGPS or user written software.
TXB
For user’s application (not currently used).
RF_ON
This pin indicates state of RF voltage.
GPS_RF_IN
This pin receives GPS analog signal. The line on the PCB between the
antenna(or antenna connector) has to be a controlled impedance line
(Microstrip at 50
Ω
).
V_ANT_IN
This pin is reserved as external DC power supply input for active antenna.
If using 2.85V active antenna, pin 20 has to be connected to pin 19.
If using 3.3V or 5V active antenna ,this pin has to be connected to 3.3V or
5V power supply.
PS: The current must be
≦
100mA and voltage
≦
12V,if using external
power supply.
VCC_RF_OUT
This pin can provide power 35mA@2.85V for active antenna.
Reset
This pin provides an active-low reset input to the board. It causes the board
to reset and start searching for satellites. If not utilized, it may be left open.
PPS
This pin provides one pulse-per-second output from the board, which is
synchronized to GPS time. This is not available in Trickle Power mode.
V_RTC_3V3 (Backup battery )
This is the battery backup input that powers the SRAM and RTC when
main power is removed. Typical current draw is 10uA.
The supply voltage should be between 1.6V and 3.6V.
GPIO Functions
