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Rgm-3550lp user manual – RoyalTek RGM-3550LP User Manual

Page 9

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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.