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RoyalTek Confidential
9
RDR-3100 User Manual
This is the main receiver channel and is used to receive software commands to the
board from SIRFdemo software or from user written software.
l RXD2
This is the auxiliary receiving channel communicated with car pc with can bus
l TXD1
This is the main transmitting channel and is used to output navigation and
measurement data to SiRFdemo or user written software.
l TXD2
This is the auxiliary transmitting channel communicated with car pc with can bus
l ODOMETER
This pin provides for connecting to odometer.
l RTC (Backup voltage)
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 2.5V and 3.6V.
l BACK (Backward)
This pin provides for connecting to backward signal.
l 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.
5.2 RF connector type: MCX STRAIGHT PCB JACK (J1)
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 50Ω). This pin
can provide maximum power 30mA @ 2.85V for active antenna.
6. Product Picture
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