Digi M130 User manual

52 Omnin

Digi

®

m130

™

Hardware Reference Manual

90001178_B

Release date: April 2011

Omni Product

Technical Specification

Digi

®, Digi International®, the Digi logo, a Digi International Company, Digi m130 are trademarks or registered

trademarks of Digi International, Inc. in the United States and other countries worldwide. All other trademarks are the

property of their respective owners. All other trademarks mentioned in this document are the property of their

respective owners.

Information in this document is subject to change without notice and does not represent a commitment on the part of

Digi International.

Digi provides this document “as is,” without warranty of any kind, either expressed or implied, including, but not

limited to, the implied warranties of fitness or merchantability for a particular purpose. Digi may make improvements

and/or changes in this manual or in the product(s) and/or the program(s) described in this manual at any time.

This product could include technical inaccuracies or typographical errors. Changes are periodically made to the

information herein; these changes may be incorporated in new editions of the publication.

Document History

Revision Date Changes

A October 2010 Initial release

B April 2011

Detailing the DC ground characteristics in Section

3.19.1.2.3 and Table 42 in Section 3.19.1.1.3

Omni Product

Technical Specification

Contents

1 About This Document .................................................................................... 8

1.1 . Documentation Updates ........................................................................................................... 8

1.2 . Contact Information ................................................................................................................. 8

1.3 . Reference Documents .............................................................................................................. 8

1.3.1 Sierra Wireless Reference Documentation ................................................................. 8

1.3.2 General Reference Documentation ............................................................................. 8

1.4 . List of Abbreviations ............................................................................................................... 9

2 General Description ..................................................................................... 12

2.1 . General Information ............................................................................................................... 12

2.1.1 RoHS Compliance .................................................................................................... 12

2.1.2 Digi m130 Features ................................................................................................... 13

2.1.3 Primary Interfaces ..................................................................................................... 13

2.1.4 Operating System ...................................................................................................... 13

2.2 . Functional Description ........................................................................................................... 14

2.2.1 GSM Functionality ................................................................................................... 15

2.2.2 Orbcomm Functionality ............................................................................................ 15

2.2.3 GPS Functionality ..................................................................................................... 15

2.3 . Operating System ................................................................................................................... 15

3 Interfaces ...................................................................................................... 16

3.1 . Antenna Connectors ............................................................................................................... 16

3.2 . System Connector .................................................................................................................. 17

3.2.1 Reference Part Numbers ........................................................................................... 17

3.2.2 Pinout ........................................................................................................................ 18

3.3 . Power Supply ......................................................................................................................... 20

3.3.1 Power Supply Description ........................................................................................ 20

3.3.2 Recommendations for Reduced Consumption .......................................................... 29

3.4 . Electrical Information for Digital I/O .................................................................................... 30

3.5 . Serial Interface ....................................................................................................................... 31

3.5.1 SPI Bus ..................................................................................................................... 31

3.5.2 I2C Bus ..................................................................................................................... 33

3.6 . Main Serial Link (UART1) .................................................................................................... 35

3.6.1 Features ..................................................................................................................... 35

3.6.2 Pin Description of UART1 Interface ........................................................................ 35

3.7 . Auxiliary Serial Link (UART2) ............................................................................................. 39

3.7.1 Features ..................................................................................................................... 39

3.8 . General Purpose Input/Output ............................................................................................... 40

3.9 . Analog to Digital Converters ................................................................................................. 41

3.9.1 Features ..................................................................................................................... 41

3.9.2 Pin Description ......................................................................................................... 41

Omni Product

Technical Specification

3.10 Digital to Analog Converter ............................................................................................... 42

3.10.1 Features ..................................................................................................................... 42

3.10.2 Pin Description ......................................................................................................... 42

3.11 Analog Audio Interface ...................................................................................................... 43

3.11.1 Microphone Input ..................................................................................................... 43

3.11.2 Speaker Output Characteristics ................................................................................. 45

3.11.3 Design Recommendation .......................................................................................... 46

3.11.4 Buzzer Output ........................................................................................................... 49

3.12 PWR_ENB_N ..................................................................................................................... 51

3.12.1 Features ..................................................................................................................... 51

3.12.2 Pin Description ......................................................................................................... 51

3.12.3 Application ................................................................................................................ 51

3.13 HW_SD Signal ................................................................................................................... 54

3.14 External Interrupt ................................................................................................................ 56

3.15 BOOT Signal ...................................................................................................................... 56

3.15.1 Features ..................................................................................................................... 57

3.15.2 Pin Description ......................................................................................................... 57

3.15.3 Application ................................................................................................................ 57

3.16 VREF_2V8 Output ............................................................................................................. 58

3.17 BAT-RTC (Backup Battery) ............................................................................................... 59

3.17.1 Interface Description ................................................................................................. 59

3.18 FLASH-LED Signal ........................................................................................................... 60

3.19 RF Interface ........................................................................................................................ 61

3.19.1 RF Performance ........................................................................................................ 61

3.20 Environmental Specifications ............................................................................................. 70

3.21 Mechanical Specifications .................................................................................................. 71

3.22 Antenna Suppliers ............................................................................................................... 71

3.23 Standards and Recommendations ....................................................................................... 73

3.24 Declaration of Conformity .................................................................................................. 77

3.25 Safety Recommendations (for Information Only) .............................................................. 78

3.25.1 RF Safety .................................................................................................................. 78

3.25.2 General Safety ........................................................................................................... 79

Omni Product

Technical Specification

List of Figures

Figure 1: Top Level Architecture .................................................................................................................................... 14

Figure 2: Power supply during burst emission ................................................................................................................ 20

Figure 3: Connected Mode Current Waveform .............................................................................................................. 24

Figure 4: Slow Idle Mode Current Waveform ................................................................................................................ 25

Figure 5: Fast Idle Mode Current Waveform .................................................................................................................. 25

Figure 6: Transfer Mode Class 10 Current Waveform ................................................................................................... 26

Figure 7: SPI Timing diagrams, Mode 0, Master, 4 wires .............................................................................................. 32

Figure 8: I²C Timing diagrams, Master .......................................................................................................................... 34

Figure 9: Example of V24/CMOS serial link implementation for UART1 .................................................................... 37

Figure 10: Example of full modem V24/CMOS serial link implementation for UART1 .............................................. 38

Figure 11: Example of MIC input connection with LC filter ......................................................................................... 44

Figure 12: Example of MIC input connection without LC filter .................................................................................... 44

Figure 13: Example of Speaker connection .................................................................................................................... 46

Figure 14: Capacitor near Microphone ........................................................................................................................... 46

Figure 15: Audio track design ........................................................................................................................................ 48

Figure 16: Example of buzzer implementation ............................................................................................................... 50

Figure 17: Example of LED driven by the BUZZ-OUT output ..................................................................................... 50

Figure 18: Example of ON/~OFF pin connection ........................................................................................................... 51

Figure 19: Power-ON sequence (no PIN code activated) ............................................................................................... 52

Figure 20: Power-OFF sequence .................................................................................................................................... 54

Figure 21: Proper shut down sequence ........................................................................................................................... 55

Figure 22: Shut down timing diagram ............................................................................................................................ 55

Figure 23: Boot Selection Application Example ............................................................................................................ 57

Figure 24: Real Time Clock power supply ..................................................................................................................... 59

Figure 25: GPS TTFF, Hot Start Configuration ............................................................................................................. 64

Figure 26: GPS TTFF, Warm Start Configuration ......................................................................................................... 65

Figure 27: GPS TTFF, Simulator Cold Start Configuration ........................................................................................... 66

Figure 28: First Position Fix Accuracy Chart 01 ............................................................................................................ 67

Figure 29: First Position Fix Accuracy Chart 02 ............................................................................................................ 68

Figure 30: First Position Fix Accuracy Chart 03 ............................................................................................................ 69

Figure 31: Environmental classes ................................................................................................................................... 70

Omni Product

Technical Specification

List of Tables

Table 1: GSM /GPRS Frequency .................................................................................................................................... 15

Table 2: Antenna Connectors (Coding, Keying) ............................................................................................................. 16

Table 3: System Connector Reference Part Numbers ..................................................................................................... 17

Table 4: System connector pinout ................................................................................................................................... 19

Table 5: Power Supply Voltage ...................................................................................................................................... 20

Table 6: GSM power consumption without Open AT processing .................................................................................. 22

Table 7: Power consumption with Dhrystone benchmark Open AT application ........................................................... 23

Table 8: Power Supply Pin-out ....................................................................................................................................... 28

Table 9: CMOS Output / Input Electrical Characteristics for 2.8 volt signals ................................................................ 30

Table 10: CMOS Output / Input Electrical Characteristics for 1.8 volt signals .............................................................. 30

Table 11: Open Drain Electrical Characteristics ............................................................................................................. 30

Table 12: SPI Bus AC characteristics ............................................................................................................................. 32

Table 13: SPI Bus Configuration .................................................................................................................................... 32

Table 14: SPI Bus Pin description .................................................................................................................................. 33

Table 15: I²C Bus AC characteristics ............................................................................................................................. 34

Table 16: IC Bus Pin Description ................................................................................................................................... 34

Table 17: UART1 Pin Description .................................................................................................................................. 35

Table 18: UART2 Pin Description .................................................................................................................................. 39

Table 19: GPIOs Pin Description ................................................................................................................................... 40

Table 20: ADCs Electrical Characteristics ..................................................................................................................... 41

Table 21: ADCs Pin Description .................................................................................................................................... 41

Table 22: DAC Electrical Characteristics ...................................................................................................................... 42

Table 23: DAC Pin Description ...................................................................................................................................... 42

Table 24: MIC2 Pin Description

..................................................................................................................................... 43

Table 25: MIC2 Electrical Characteristics ..................................................................................................................... 43

Table 26: SPK Pin Description ....................................................................................................................................... 45

Table 27: SPK Electrical Characteristics ....................................................................................................................... 45

Table 28: Audio filtering Examples with Murata Components ...................................................................................... 47

Table 29: PWM/Buzzer Output Electrical Characteristics ............................................................................................. 49

Table 30: PWM/Buzzer Output Pin Description ............................................................................................................ 49

Table 31: External Interrupt Pin description .................................................................................................................. 56

Table 32: External Interrupt Electrical Characteristics ................................................................................................... 56

Table 33: Boot Signal Mode ........................................................................................................................................... 57

Table 34: Boot Pin Description ...................................................................................................................................... 57

Table 35: VREF_2V8 Pin Description ........................................................................................................................... 58

Omni Product

Technical Specification

Table 36: VREF_2V8 Electrical Characteristics ............................................................................................................ 58

Table 37: Bat-RTC Pin Description ............................................................................................................................. 59

Table 38: Bat-RTC Electrical Characteristics ................................................................................................................ 59

Table 39: Flash-LED Status ........................................................................................................................................... 60

Table 40: Flash-LED Pin Description ............................................................................................................................ 60

Table 41: Flash-LED Electrical Characteristics ............................................................................................................. 60

Table 42: GSM Antenna Specifications ......................................................................................................................... 62

Table 43: GPS Performance ........................................................................................................................................... 64

Omni Product

Technical Specification

1 About This Document

This document outlines the technical specifications and design integration related aspects of the Digi m130 dual-mode

modem.

The Digi m130 product, formerly known as Wavecom

®

Q52 Omni / Sierra Wireless

™

AirPrime

™

Q52 Omni, is owned

and sold by Digi International, Inc. All regulatory related certifications are in the process of being transferred to Digi

International as part of the official product rebranding process. The product design was not modified. Customers are

able to use the product based on existing certifications while the regulatory ownership transition is in progress.

1.1 Documentation Updates

Please always check the product specific section on the Digi support website at www.digiembedded.com/support for

the most current revision of this guide and other product related documents.

1.2 Contact Information

For more information about Digi products, or for customer service and technical support, please contact us.

World Wide Web

http://www.digiembedded.com/support

E-Mail

support.wizards@digi.com

Telephone (U.S.)+1 952 912-3444 or (877) 912-3444

Telephone (other locations)+1 952 912-3444 References

1.3 Reference Documents

For more details, several reference documents may be consulted. The Sierra Wireless reference documents are

provided in the Sierra Wireless document package, which are not authored by Digi International.

1.3.1 Sierra Wireless Reference Documentation

[1] ADL User Guide for OS v6.00 or later. Reference: WM_DEV_OAT_UGD_080

[2] DWLWin Download Application User. Guide. Reference: WM_DEV_TOO_UGD_010

[3] AT Command Interface Guide for Open AT

®

Firmware v7.0 or later. Reference: WM_DEV_OAT_UGD_059

1.3.2 General Reference Documentation

[4] “I²C Bus Specification”, Version 2.0, Philips Semiconductor 1998

[5] ISO 7816-3 Standard

Omni Product

Technical Specification

1.4 List of Abbreviations

Abbreviation

Definition

AC

Alternating Current

ADC

Analog to Digital Converter

A/D

Analog to Digital conversion

AF

Audio-Frequency

AT

ATtention (prefix for modem commands)

AUX

AUXiliary

CAN

Controller Area Network

CB

Cell Broadcast

CEP

Circular Error Probable

CLK

CLocK

CMOS

Complementary Metal Oxide Semiconductor

CS

Coding Scheme

CTS

Clear To Send

DAC

Digital to Analog Converter

dB

Decibel

DC

Direct Current

DCD

Data Carrier Detect

DCE

Data Communication Equipment

DCS

Digital Cellular System

DR

Dynamic Range

DSR

Data Set Ready

DTE

Data Terminal Equipment

DTR

Data Terminal Ready

EFR

Enhanced Full Rate

E-GSM

Extended GSM

EMC

ElectroMagnetic Compatibility

EMI

ElectroMagnetic Interference

EMS

Enhanced Message Service

EN

ENable

ESD

ElectroStatic Discharges

FIFO

First In First Out

FR

Full Rate

FTA

Full Type Approval

GND

GrouND

Omni Product

Technical Specification

Abbreviation

Definition

GPI

General Purpose Input

GPC

General Purpose Connector

GPIO

General Purpose Input Output

GPO

General Purpose Output

GPRS

General Packet Radio Service

GPS

Global Positioning System

GSM

Global System for Mobile communications

HR

Half Rate

I/O

Input / Output

LED

Light Emitting Diode

LNA

Low Noise Amplifier

MAX

MAXimum

MIC

MICrophone

MIN

MINimum

MMS

Multimedia Message Service

MO

Mobile Originated

MT

Mobile Terminated

na

Not Applicable

NF

Noise Factor

NMEA

National Marine Electronics Association

NOM

NOMinal

NTC

Negative Temperature Coefficient

PA

Power Amplifier

Pa

Pascal (for speaker sound pressure measurements)

PBCCH

Packet Broadcast Control CHannel

PC

Personal Computer

PCB

Printed Circuit Board

PDA

Personal Digital Assistant

PFM

Power Frequency Modulation

PSM

Phase Shift Modulation

PWM

Pulse Width Modulation

RAM

Random Access Memory

RF

Radio Frequency

RFI

Radio Frequency Interference

RHCP

Right Hand Circular Polarization

RI

Ring Indicator

RST

ReSeT

Omni Product

Technical Specification

Abbreviation

Definition

RTC

Real Time Clock

RTCM

Radio Technical Commission for Maritime services

RTS

Request To Send

RX

Receive

SCL

Serial CLock

SDA

Serial DAta

SIM

Subscriber Identification AirPrime WMP100 CPU

SMS

Short Message Service

SPI

Serial Peripheral Interface

SPL

Sound Pressure Level

SPK

SPeaKer

SRAM

Static RAM

TBC

To Be Confirmed

TDMA

Time Division Multiple Access

TP

Test Point

TVS

Transient Voltage Suppressor

TX

Transmit

TYP

TYPical

UART

Universal Asynchronous Receiver-Transmitter

USB

Universal Serial Bus

USSD

Unstructured Supplementary Services Data

VSWR

Voltage Standing Wave Ratio

Omni Product

Technical Specification

2 General Description

2.1 General Information

The Digi m130 is a dual-mode GSM/Orbcomm transceiver consisting of an E-GSM/GPRS 900/1800 and 850/1900

quad-band GSM transceiver combined with a full function Orbcomm transceiver. An optional high performance GPS

receiver is also available, giving a system integrator the ability to design a global coverage asset tracking device with

minimal external circuitry.

A Digi m130 user always has complete control of the active communication modes and GPS receiver operations. One

or both communication transceivers can be active while the AirPrime WMP100 CPU

is performing continuous GPS

location.

The internal ARM9 microcontroller runs a multi-tasking OS to execute all GSM functionality while transparently

providing up to 80 MIPS of excess processing power for the user’s embedded firmware application. Five megabytes

of flash memory and 1.5 megabytes of RAM are available for the user specific C language application code.

2.1.1 RoHS Compliance

The Digi m130 is compliant with RoHS (Restriction of Hazardous Substances in Electrical and Electronic Equipment)

Directive 2002/95/EC which sets limits for the use of certain restricted hazardous substances. This directive states that

“from 1st July 2006, new electrical and electronic equipment put on the market does not contain lead, mercury,

cadmium, hexavalent chromium, polybrominated biphenyls (PBB) or polybrominated diphenyl ethers (PBDE)”.

Omni Product

Technical Specification

2.1.2 Digi m130 Features

• Cellular Connectivity

o 2-Watt EGSM 900/GSM 850 radio

o 1-Watt GSM1800/1900 radio

o GPRS class 10 capable

• Satellite Connectivity

o 5-Watt Orbcomm Satellite Transceiver

o Digi ASIC Transceiver Technology

• Optional GPS Receiver

2.1.3 Primary Interfaces

• Power supply

• 2

*

• GSM Analog audio

UARTs Serial links

• Serial Protocol Interface (SPI)

• I

2

C Interface

• 2 A/D inputs and 1 D/A output

• Digital I/Os

• GSM , GPS

†

2.1.4 Operating System

and Orbcomm antenna ports

• Real Time Clock with calendar

• Echo Cancellation + noise reduction (quadri codec)

• Full GSM and GPRS support

• Full Orbcomm protocol stack

• Full GPS protocol stack

†

*

On Digi m130 variant without GPS functionality

†

Depending on product variant in use

Omni Product

Technical Specification

2.2 Functional Description

The top level architecture of the Digi m130 is described below:

Digi Satellite

RF/Baseband

ASIC

40-Pin

System

Connector

AirPrime

WMP100

Wireless CPU

Blackfin DSP

SDRAM

DSP Program Memory

RF

Transmitter

RF

Receiver

T/R Switch

Orbcomm

TCXO

External

Synthesizer

Power Supply Regulators

Serial UART 1

I2C Interface

Power Enable

11 -16 Vdc

External Interrupt

Serial UART 2*

SPI Interface

Orbcomm

Antenna

Connection

GSM/GPRS

Antenna

Connection

GND

3.6V

RTC Battery

VREF

32 kHz

XTAL

GSM SIM

ON/OFF

+3.6Vdc

Temp

sensor

3.3 V

9.5V

Orbcomm Transceiver

LED Driver

Buzzer Driver

DAC

ADC0

ADC1

Audio Interface

Reset

Watchdog

Interruption

Power On

Flash

Memory

PSRAM

Memory

Acquisition

OPUS

State Machine

Tracking

Prelude III

RF

Receiver

Serial UART 2*

3.6V

GPS

Antenna

Connection

GPS

Optional

*: Serial UART 2 is available on connector only on variants without GPS

Figure 1: Top Level Architecture

Omni Product

Technical Specification

2.2.1 GSM Functionality

The Radio Frequency (RF) range of the GSM transceiver complies with the Phase II EGSM 900/DCS 1800 and GSM

850/PCS 1900 recommendations. The frequencies are:

Transmit band (Tx) Receive band (Rx)

GSM 850

824 to 849 MHz 869 to 894 MHz

E-GSM 900

880 to 915 MHz 925 to 960 MHz

DCS 1800

1710 to 1785 MHz 1805 to 1880 MHz

PCS 1900

1850 to 1910 MHz 1930 to 1990 MHz

Table 1: GSM /GPRS Frequency

Voice, SMS, and GPRS data services are available either by employing the Digi m130 as a modem device connected

to a user’s external processor by the UART1 link, or available through a C API to the user’s embedded Open AT

software application running on the Digi m130 ARM9 microprocessor.

2.2.2 Orbcomm Functionality

The Digi m130 Orbcomm transceiver provides a wide area packet switched two-way communication capability.

Communication between the Digi m130 and the Orbcomm Gateway is accomplished through a constellation of low-

Earth orbit satellites, orbiting approximately 500 miles above the earth.

Radio frequency communication within the Orbcomm system operates in the VHF portion of the frequency spectrum

between 137 and 150 Megahertz.

Orbcomm packet data services can be accessed via a user’s external application over the UART1 link or from a user’s

embedded Open AT software application running on the Digi m130 ARM9 microprocessor.

2.2.3 GPS Functionality

The optional Digi m130 GPS receiver provides position location and tracking capabilities that can be accessed by an

external application over a NMEA UART link or from a C API available to the user’s embedded Open ATsoftware

application running on the Digi m130 ARM9 microprocessor.

2.3 Operating System

The Operating System offers an extensive set of AT commands to control both the GSM and Orbcomm functionality

of the AirPrime WMP100 CPU.

The Operating System of the AirPrime WMP100 CPU is Open AT. This enables customers to implement market and

application specific functionality.

Omni Product

Technical Specification

3 Interfaces

3.1 Antenna Connectors

The Digi m130 provides FAKRA-type RF antenna connectors with double-locking mechanism, keying, and interface

specific color-coding. See table below for additional information.

Interface Color Key Diagram

GSM Bordeaux Violet D

GPS Blue C

Satellite Curry K

Table 2: Antenna Connectors (Coding, Keying)

Omni Product

Technical Specification

3.2 System Connector

The main system connector is a keyed ODU MINI-FLAKAFIX 40-pin connector with 1.27 mm pitch.

3.2.1 Reference Part Numbers

The table below provides corresponding ODU reference part numbers.

Description ODU P/N

Delivery Option (nnn)

002

(Tube)

003

(Tube)

010

(Box)

050

(Tape)

System Connector 515.569.035.040.nnn 14 530

Mating Ribbon

Connector

525.060.035.040.nnn

15

30

SMT Mating Header 525.041.035.040.nnn 15 400

Ribbon Cable (AWG 30) 921.659.031.040.000

Table 3: System Connector Reference Part Numbers

Please visit the ODU website at

www.odu.de for detailed technical specifications as well as regional contact and order

information

Omni Product

Technical Specification

3.2.2 Pinout

Pin Signal Description Dir Pin Type Alternate

Function

1

BUZZ-OUT

Buzzer Output

O

Open Drain

2

VREF_2V8

Logic Voltage Reference

O

V-Ref

3

FLASH-LED

Flash LED Driver

O

Open Drain

4

BAT-RTC

Battery for RTC

I/O

Power

5

GND

Chassis Ground

Ground

6

GND

Chassis Ground

Ground

7

SPK2

Speaker Audio from AirPrime

WMP100 CPU

O

Audio

8

GND

Chassis Ground

Ground

9

AGND

Analog Reference

Ground

10

MIC2

Microphone Audio to AirPrime

WMP100 CPU

I

Audio

11

DAC0

8 bit D/A Converter Output

O

0 - 2 volts

12

PWR_ENB_N

Switches the AirPrime WMP100

CPU ON

I

CMOS_2V8

13

ADC0

10 bit A/D Converter Input

I

0 - 2 volts

14

ADC1

10 bit A/D Converter Input

I

0 - 2 volts

15

HW_SD

Hardware Shutdown

I/O

CMOS_2V8

16

EXT-INT

External Interrupt Signal

I

CMOS_2V8

GPIO46

17

SPI-I

SPI Input (four wire interface)

I

CMOS_2V8

GPIO30

18

SPI1-IO

SPI1 Out (four wire interface)

SPI1 IO (three wire interface)

O

I/O

CMOS_2V8

GPIO29

19

SPI-CLK

SPI1 Clock

I/O

CMOS_2V8

GPIO28

20

SPI-CS

SPI1 Chip Select

O

CMOS_2V8

GPIO31

21

GND

Chassis Ground

Ground

22

GND

Chassis Ground

Ground

23

DCD1

Data Carrier Detect_UART1

O

CMOS_2V8

GPIO43

24

RI1

Ring Indicator_UART1

O

CMOS_2V8

GPIO42

25

CTS1

Clear to Send_UART1

O

CMOS_2V8

GPIO39

26

DTR1

Data Terminal Ready_UART1

I

CMOS_2V8

GPIO41

27

TXD1

Transmit Data_UART1

I

CMOS_2V8

GPIO36

28

RTS1

Request to Send_UART1

I

CMOS_2V8

GPIO38

29

VCC_12V

12 VDC supply input

I

Power

30

RXD1

Receive Data_UART1

O

CMOS_2V8

GPIO37

Omni Product

Technical Specification

Pin Signal Description Dir Pin Type Alternate

Function

31

VCC_12V

12 VDC supply input

I

Power

32

VCC_12V

12 VDC supply input

I

Power

33

VCC_3V8

3.8 VDC regulated supply

I

Power

34

VCC_3V8

3.8 VDC regulated supply

I

Power

35

SDA_I2C

I

2

C Data

I/O

Open Drain

GPIO27

36

SCL_I2C

I

2

C Clock

O

Open Drain

GPIO26

37

TXD2

Transmit Data_UART2

I

CMOS_1V8

GPIO14

38

CTS2

Clear to Send_UART2

O

CMOS_1V8

GPIO16

39

RXD2

Receive Data_UART2

O

CMOS_1V8

GPIO15

40

RTS2

Request to Send_UART2

I

CMOS_1V8

GPIO17

Table 4: System connector pinout

Omni Product

Technical Specification

3.3 Power Supply

3.3.1 Power Supply Description

The power supply required for the Digi m130 is a dual rail supply; VCC_3V8 and VCC_12V. VCC_12V is only

required to support Orbcomm mode operation. VCC_3V8 is used for GSM/GPRS, Orbcomm and GPS operation.

The power supply is one of the key issues in the design of a dual mode terminal. Getting full performance from the

AirPrime WMP100 CPU requires particularly careful attention to the ability of the power supplies to provide clean

DC power.

Due to the burst emission modes used in GSM/GPRS, and Orbcomm communication, the VCC_3V8 and VCC_12V8

power supplies must be able to deliver high current peaks in a short time. During the peaks, the ripple (U

ripp

) on these

supply voltages must not exceed a certain limit (see Table 5: Power Supply Voltage).

Figure 2 below shows a typical current waveform during a GSM voice transmission.

Uripp

VCC 3V8

Uripp

T = 4,615 ms

t = 577 µs

Figure 2: Power supply during burst emission

VCC_3V8

Supplies the GSM, Orbcomm, and GPS RF components. It is essential to keep a minimum voltage ripple at this

connection in order to avoid any degradation in system performance.

Supplies the GSMRF Power Amplifier current (2.0 A peak) flows with a duty factor of 1/8 of the time (around 577µs

every 4.615ms for GSM /GPRS cl. 2) and 2/8 of the time (around 1154µs every 4.615ms for GSM /GPRS cl. 10) with

a typical rise time of 10µs.

VCC_12V8

Supplies the Orbcomm transmitter current (2.0 A peak). Transmit burst duration is 450ms worst case with a maximum

duty factor of less than 10%. In typical applications only a few burst transmissions occur per day.

V

min

V

nom

V

max

Ripple max (U

ripp

)

VCC_12V 11.0 13.6 16.0 TBD mVpp

VCC_3V8

1,2

3.6 3.8 4.0 200mVrms

Table 5: Power Supply Voltage

(1): This value has to be guaranteed during the burst (with 2.0A Peak in GSM or GPRS mode)

(2): Max operating Voltage Stationary Wave Ratio (VSWR) 2:1

When the AirPrime WMP100 CPU is in Alarm mode, no voltage must be applied on any pin of the 40-pin

connector except on VRTC (pin 4) for RTC operation or PWR_EN (pin 12) to power ON the dual mode

Transceiver.

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Digi M130 User manual

Digi M130 User manual

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