Linx GM User Manual

GM Series

Evaluation Module

User's Guide

Warning: Linx radio frequency (“RF”) products may be used to

control machinery or devices remotely, including machinery or devices
that can cause death, bodily injuries, and/or property damage if
improperly or inadvertently triggered, particularly in industrial settings or
other applications implicating life-safety concerns. No Linx Technologies
product is intended for use in any application without redundancies
where the safety of life or property is at risk.

The customers and users of devices and machinery controlled with
RF products must understand and must use all appropriate safety
procedures in connection with the devices, including without limitation,
using appropriate safety procedures to prevent inadvertent triggering by
the user of the device and using appropriate security codes to prevent
triggering of the remote controlled machine or device by users of other
remote controllers.

All RF products are susceptible to RF interference that can prevent
communication. Lack of good sight of the GPS satellites (open sky)

can affect the accuracy of a position fix or prevent a fix entirely.

Do not use any Linx product over the limits in this data guide.
Excessive voltage or extended operation at the maximum voltage could
cause product failure. Exceeding the reflow temperature profile could
cause product failure which is not immediately evident.

Do not make any physical or electrical modifications to any Linx
product. This will void the warranty and regulatory and UL certifications

and may cause product failure which is not immediately evident.

!

Table of Contents

1 Introduction
2 Ordering Information
2 ElectricalSpecications
3 PinAssignments
3 PCB Layout
3 Schematic

– –

1

Introduction

The GM Series GNSS receiver module is a self-contained
high-performance Global Satellite Navigation System receiver. Based on
the MediaTek chipset, it can simultaneously acquire and track multiple
satellite constellations. These include the United States GPS system,
Europe’s GALILEO, Russia’s GLONASS and Japan’s QZSS.

The module provides exceptional sensitivity, even in dense foliage and
urban canyons. It’s very low power consumption helps maximize runtimes
in battery powered applications. Hybrid ephemeris prediction can be used
to achieve cold start times of less than 15 seconds. The module outputs
standard NMEA data.

The evaluation module contains the surface mount GM Series GNSS
module, SMA connector and a ferrite bead (used to supply power to an
external active antenna, such as the Linx SH Series active GPS antenna)
on a single board with through-hole headers. This small board makes
prototyping with the GM Series module very easy.

GM Series Evaluation Module

User's Guide

Revised 9/24/13

Figure 1: GM Series Evaluation Module

– – – –

2 3

Ordering Information

ElectricalSpecications

Warning: This product incorporates numerous static-sensitive

components. Always wear an ESD wrist strap and observe proper ESD
handling procedures when working with this device. Failure to observe
this precaution may result in module damage or failure.

Schematic

2-5

1
2
3
4
5
6
7
8
9
10

J2

GND

GND

VCC

VBACKUP

1
2
3
4
5
6
7
8
9
10

J1

GND

GND

TXD
RXD

1PPS

RESET

TXD

RXD

VCC

RF

1

GND

ANT1

CONSMA001

GND

GND

GND

GND GND

NC

1

NC

2

1PPS

3

TX

4

RX

5

NC

6

NC

7

RESET

8

NC

9

NC10VBACKUP

11

VCC

12

NC

13

NC

14

NC

15

NC

16

VOUT

17

GND

18

RFIN

19

GND

20

GND21GND

22

U1

RXM-GPS-GM

1PPS

VBACKUP

RESET

L1

300ohm BEAD

Ordering Information

Part Number Description

EVM-GNSS-GM GM Series Evaluation Module

RXM-GNSS-GM GM Series GNSS Receiver Module

MDEV-GNSS-GM GM Series GNSS Receiver Master Development System

Figure 2: Ordering Information

Figure 3: Electrical Specifications

1.20”

(47.24)

0.10”

(2.54)

0.10”

(2.54)

0.10”

(2.54)

1.10”

(27.94)

1.00”

(25.40)

Ø0.04” x 10

(1.02)

PCB Layout

GM Series GNSS Receiver Specifications

Parameter Symbol Min. Typ. Max. Units Notes

Power Supply

Operating Voltage V

CC

3.0 3.3 4.3 VDC

Supply Current l

CC

Peak 150 mA 1

Acquisition 24 mA 1

Tracking 16 mA 1

Standby 0.365 mA 1

Backup Battery Voltage V

BAT

2.0 4.3 VDC

Backup Battery Current I

BAT

7 µA 2

Antenna Port

RF Impedance R

IN

50 Ω

Environmental

Operating Temperature
Range

–40 +85 °C

Storage Temperature
Range

–40 +85 °C

1. VCC = 3.3V, without active antenna, ephemeris prediction is off

2. VCC = 0V

PinAssignments

GND
NC
NC
VCC
NC
VBACKUP
NC
NC
NC
GND

GND

NC

NC
TXD
RXD

1PPS

RESET

NC

NC

GND

Figure 4: EVM-GNSS-GM Pin Assignments

Figure 5: EVM-GNSS-GM PCB Layout Dimensions

Figure 6: EVM-GNSS-GM Schematic

Linx Technologies

159 Ort Lane

Merlin, OR, US 97532

3090 Sterling Circle, Suite 200

Boulder, CO 80301

Phone: [phone]

Fax: [phone]

www.linxtechnologies.com

Disclaimer

Linx Technologies is continually striving to improve the quality and function of its products. For this reason, we
reserve the right to make changes to our products without notice. The information contained in this Data Guide
is believed to be accurate as of the time of publication. Specifications are based on representative lot samples.
Values may vary from lot-to-lot and are not guaranteed. “Typical” parameters can and do vary over lots and
application. Linx Technologies makes no guarantee, warranty, or representation regarding the suitability of any
product for use in any specific application. It is Customer’s responsibility to verify the suitability of the part for the
intended application. At Customer’s request, Linx Technologies may provide advice and assistance in designing
systems and remote control devices that employ Linx Technologies RF products, but responsibility for the ultimate
design and use of any such systems and devices remains entirely with Customer and/or user of the RF products.

LINX TECHNOLOGIES DISCLAIMS ANY AND ALL WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE. IN NO EVENT SHALL LINX TECHNOLOGIES BE LIABLE FOR ANY CUSTOMER’S OR
USER’S INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF OR RELATED TO THE DESIGN OR USE
OF A REMOTE CONTROL SYSTEM OR DEVICE EMPLOYING LINX TECHNOLOGIES RF PRODUCTS OR FOR ANY
OTHER BREACH OF CONTRACT BY LINX TECHNOLOGIES. CUSTOMER AND/OR USER ASSUME ALL RISKS
OF DEATH, BODILY INJURIES, OR PROPERTY DAMAGE ARISING OUT OF OR RELATED TO THE USE OF LINX
TECHNOLOGIES RF PRODUCTS, INCLUDING WITH RESPECT TO ANY SERVICES PROVIDED BY LINX RELATED
TO THE USE OF LINX TECHNOLOGIES RF PRODUCTS. LINX TECHNOLOGIES SHALL NOT BE LIABLE UNDER ANY
CIRCUMSTANCES FOR A CUSTOMER’S, USER’S, OR OTHER PERSON’S DEATH, BODILY INJURY, OR PROPERTY
DAMAGE ARISING OUT OF OR RELATED TO THE DESIGN OR USE OF A REMOTE CONTROL SYSTEM OR DEVICE
EMPLOYING LINX TECHNOLOGIES RF PRODUCTS.

The limitations on Linx Technologies’ liability are applicable to any and all claims or theories of recovery asserted
by Customer, including, without limitation, breach of contract, breach of warranty, strict liability, or negligence.
Customer assumes all liability (including, without limitation, liability for injury to person or property, economic loss,
or business interruption) for all claims, including claims from third parties, arising from the use of the Products.
Under no conditions will Linx Technologies be responsible for losses arising from the use or failure of the device
in any application, other than the repair, replacement, or refund limited to the original product purchase price.
Devices described in this publication may contain proprietary, patented, or copyrighted techniques, components,
or materials.

© 2013 Linx Technologies. All rights reserved.

The stylized Linx logo, Wireless Made Simple, CipherLinx, WiSE and the stylized CL logo are trademarks of Linx Technologies.

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