RoyalTek RGM-3550LP - Manual (Page 9)

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.