SEPTENTRIO AsteRx-m3 Manuel utilisateur

AsteRx-m3 Product Group

Hardware Manual

Version 2.2.0

AsteRx-m3 Product Group Hardware Manual

Version 2.2.0

May 28, 2021

Septentrio

Greenhill Campus, Interleuvenlaan 15i

3001 Leuven, Belgium

http://www.septentrio.com

Phone: +32 16 300 800

Fax: +32 16 221 640

@septentrio

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1Table of contents 
1TABLE OF CONTENTS................................................................................................... 3 
2ASTERX-M3 OEM .......................................................................................................... 6 
1 Mounting .................................................................................................................. 7 
2 Environmental ......................................................................................................... 7 
3 Power and Power Consumption ............................................................................ 7 
4 RF Interface.............................................................................................................. 8 
4.1 Electrical Specifications .......................................................................................... 8 
5 I/O Connectors....................................................................................................... 10 
5.1 30-pin Connector.................................................................................................. 11 
5.2 60-pin connector................................................................................................... 12 
6 External Frequency Reference Input (REF IN).................................................... 14 
7 Frequency Reference Output (REF OUT)............................................................. 14 
8 Event/TimeSync Inputs......................................................................................... 14 
9 General Purpose Output (GPx) ............................................................................ 15 
10 Standby Mode ........................................................................................................ 15 
11 SD Memory Card Usage ........................................................................................ 16 
12 USB Interface ......................................................................................................... 17 
13 Ethernet.................................................................................................................. 17 
3ROBOTICS INTERFACE BOARD .................................................................................. 19 
1 Mechanical Drawings............................................................................................ 20 
2 USB Dev................................................................................................................... 20 
3 44-pin Header......................................................................................................... 21 
4 LEDs......................................................................................................................... 22 
5 Log Button Header ................................................................................................ 23 
6 PPS/Event Header.................................................................................................. 23 
7 Power Supply Options........................................................................................... 23 

4DEVELOPMENT KIT .................................................................................................... 25

4.1 Header Types ......................................................................................................... 25

4.2 Powering the DevKit ............................................................................................. 25

4.3 Antenna Connectors ............................................................................................. 26

4.4 LEDs and General Purpose Output Pins ............................................................. 27

4.5 COM Ports............................................................................................................... 27

4.6 PPS Out and Event Inputs..................................................................................... 28

4.7 Ethernet.................................................................................................................. 29

4.8 USB Dev................................................................................................................... 29

4.9 USB Host ................................................................................................................. 29

4.10 REF IN ...................................................................................................................... 29

4.11 Buttons ................................................................................................................... 29

4.12 SD Card Socket ....................................................................................................... 30

APPENDIX A LED STATUS INDICATORS......................................................................... 31

APPENDIX B SYSTEM NOISE FIGURE AND C/N0.......................................................... 33

APPENDIX C EMC CONSIDERATIONS ........................................................................... 34

ROHS/WEEE NOTICE

Septentrio receivers are compliant with the latest WEEE, RoHS and REACH directives. For

more info see www.septentrio.com/en/environmental-compliance.

ESD PRECAUTIONS

The OEM module is sensitive to electrostatic discharge (ESD). Although it has a limited

protection, it should only be manipulated in an ESD-safe environment and using ESD-safe

tools and equipment. These tools are typically marked with the following symbol:

AsteRx-m3 OEM

2AsteRx-m3 OEM

All dimensions in millimeters.

Weight = 27 g

Note: the above pictures and mechanical diagrams show both u.FL and MMCX antenna

connectors. In reality, only one type of connector is available depending on the board

variant.

RF connectors (u.FL or MMCX type) are mounted on top side of the PCB. The 30- and 60-

pin Hirose I/O connectors are mounted on the bottom side.

AUX1

MAIN

REF OUT

AsteRx-m3 OEM

2.1 Mounting

The four mounting holes are compatible with M3 screws. Use M3 3.5mm spacers. An

example of applicable SMD spacer is THF-1.6-3.5-M3 from MAC8.

All mounting holes are grounded, and should preferably be connected to ground on the

host PCB. Note however that the mounting holes should not be relied on as only ground

return connection: a proper ground should be supplied to the GND pins of the I/O

connector(s) as well.

The maximum height of the components at the bottom side of the AsteRx-m3 OEM board

is within the mask shown below. The maximum component height is 1.1mm in the green

area and 1.6mm in the yellow area.

2.2 Environmental

Operational: -40 to +85 °C

Storage: -55 to +85 °C

2.3 Power and Power Consumption

The board is powered through pin#1 and pin#2 of the 30-pin connector. Power supply

voltage must be 3.3V +/-5%.

The power consumption depends on the set of GNSS signals enabled with the

setSignalTracking command.

AsteRx-m3 OEM

The following table shows the typical power consumption for selected sets of signals. The

dual antenna configuration corresponds to a receiver where the option to track from the

AUX1 antenna is enabled.

Signals enabled with setSignalTracking

Power consumption

Dual antenna

Single antenna

GPS L1+L2

1.05 W

0.75 W

GPS L1+L2, GLO L1+L2

1.10 W

0.80 W

All GNSS signals from all GNSS constellations

1.60 W

1.00 W

Enabling the built-in L-Band demodulator with the setLBandSelectMode command adds

100 mW.

Enabling wideband interference mitigation with the setWBIMitigation command adds

160 mW (dual antenna) or 80mW (single antenna).

Consumption in standby mode: 3 mW

Note that the power consumption in the above table are average values. To account for

peak currents, the minimum power supply drive capability should be 1 Ampere.

2.4 RF Interface

For illustration purposes, the above picture shows both u.FL and MMCX connectors. In

reality, only one type of connector is available depending on the board variant.

The main antenna must be connected to the u.FL or MMCX connector marked “MAIN” on

the PCB and the auxiliary antenna must be connected to the AUX1 connector.

2.4.1 Electrical Specifications

Antenna supply voltage

3-5.5V DC, set via pin#18 of the 30-pin connector. The same

voltage is applied to both antennas. If pin#18 is not

connected, there is no DC voltage to the antennas.

DC series impedance

2.7 Ohms

Antenna current limit

150 mA per antenna

Antenna net gain range1

15-50 dB

For optimal performances, the net gain on MAIN and AUX1

must not differ by more than 10dB.

AUX1

MAIN

AsteRx-m3 OEM

Receiver noise figure

10 dB (with 15-dB net gain)

The receiver noise figure increases as the net gain increases,

but its contribution to the system noise figure decreases.

The worse case is for a net gain of 15dB.

RF nominal input impedance

50 Ohms

VSWR

< 2.5:1 in 1200-1251 MHz and 1560-1610 MHz range

1 The net gain is the total pre-amplification of the distribution network in front of the receiver. Typically, this

equals antenna active LNA gain minus coax losses in the applicable GNSS bands.

AsteRx-m3 OEM

2.5 I/O Connectors

The main connector is the 30-pin connector. That connector must always be connected.

The 60-pin connector provides additional signals (IO enable, serial CTS/RTS lines, GPIOs,

Ethernet, 10-MHz reference input, etc). That connector can be ignored and left

unconnected if these signals are not needed.

Warnings

•All ground pins must be connected (not applicable to the 60-pin connector if that

connector is not used).

•Do not drive a non-zero voltage into input pins (pins type “I”in the tables below)

when the receiver is not powered. In addition, if standby mode is applicable, input

pins must remain in high-Z when the IO_EN signal is not set. See section 2.10 for

details.

•When pull-up/down resistors are needed, use 10 k.

•Unused or reserved pins should be left unconnected unless explicitly mentioned

otherwise.

Conventions

•Pin Type: I=Input, O=Output, P=Power, Ctrl=Control, Clk=Reference clock

•LVTTL=3V3 Low Voltage TTL: VIL≤ 0.8V, VIH≥ 2.0V, VOL≤ 0.4V, VOH≥ 2.4V.

•PU: internally pulled up

•PD: internally pulled down

•K: keeper input type

60 pin

30 pin

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