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24 GPIO6 I/O General purpose I/O
VVVV
VCCVVVCCVV
OLOH
ILIH
4.0 4.2
*3.0 *7.0
≤≥
≤≥
25 GPIO5 I/O General purpose I/O
VVVV
VCCVVVCCVV
OLOH
ILIH
4.0 4.2
*3.0 *7.0
≤≥
≤≥
26 GPIO7 I/O General purpose I/O
VVVV
VCCVVVCCVV
OLOH
ILIH
4.0 4.2
*3.0 *7.0
≤≥
≤≥
27 GPIO13 I/O General purpose I/O
VVVV
VCCVVVCCVV
OLOH
ILIH
4.0 4.2
*3.0 *7.0
≤≥
≤≥
28 GPIO15 I/O General purpose I/O
VVVV
VCCVVVCCVV
OLOH
ILIH
4.0 4.2
*3.0 *7.0
≤≥
≤≥
29 PPS O One pulse per second
VVVV
OLOH
4.0 4.2 ≤≥
30 GND G Digital Ground Digital Reference Ground
12
REB-3300 Operational Manual
Definition of Pin assignment
VCC(+3.3V DC power Input)
This is the main DC power supply input pin. It provides voltage to module.
GND
GND provides the ground for digital part.
Bootselect
Set this pin to high for programming flash.
RXA
This is the main receiver channel and is used to receive software commands to
the board from SIRFdemo software or from user written software.
PS: Pull up if not used.
RXB
This is the auxiliary receiving channel and is used to input differential
corrections to the board to enable DGPS navigation.
PS: Pull up if not used.
TXA
This is the main transmitting channel and is used to output navigation and
measurement data to SiRFdemo or user written software.
TXB
For user’s application (not currently used).
RF_ON
This pin indicates state of RF voltage.
RF_IN
This pin receiver signal of GPS analog .due to the RF characteristics of the
signal the design has to certain criteria. The line on the PCB from the