9
RGM-3550LP User Manual
RX
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.
TX
This is the main transmitting channel and is used to output navigation and
measurement data to SiRFdemo or user written software.
GPS
Status
GPS Status Pin can be connected to a LED to indicate the status of GPS signal
1.
Solid: Power ON/ Tracking for Satellite
2.
Blinking: 3D Fix Found
GPS status light indicating
Power off
LED off
VoL:0.71(Max)
Power on/search for satellite, voltage is high
LED solid
VoH: 2.13V(min)
3D fix found, voltage is high/low, remain 1
second each
LED blinking
VoH: 2.13V(min) &
VoL:0.71(Max)
External Antenna RF Input
This is the MMCX RF Connector for External Active Antenna signal input
External Active Antenna Spec. Suggestion
1.
Drive Output Voltage:
%
5
.
0
85
.
2
±
=
V
V
OUT
2.
Drive Output Current:
)
(
30
Max
mA
I
Out
=
3.
LNA Gain: 20~26dB
4.
LNA Noise Figure: <1.5dB
How to use RGM-3550LP in 5V main board
The power supply of RGM-3550LP is 3V. If customer would like use RGM-3550LP in
5V system, RoyalTek suggest customer use linear regulator (from 5V to 3.3V) on
customer main board. We could help check the circuit if providing regulator
specification.
