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GSPS Core Module 2.0 VAM-CM HW

Description

Version 0.9

Publication Date: 13-Jan-2017

INMARSAT> GSPS

Summary of content (32 pages)

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AF T INMARSAT > GSPS GSPS Core Module 2.0 VAM-CM HW Description DR Version 0.
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Contents 1: Purpose 4 2: Scope 5 2.1: References 5 3: VAM-CM Overview 6 6 3.2: VAM-CM Concept 6 AF T 3.1: VAM Terminal Architecture 3.2.1: Evaluation module 3.3: VAM-CM Architecture 7 7 3.3.1: High Level System Design 7 3.3.2: VAM Control interface 9 4: VAM-CM interfaces DR 4.1: Absolute maximum ratings 4.2: VAM Control interface description 11 11 12 4.2.1: System USB description 12 4.2.2: USIM interface description 13 4.2.3: VAM control UART interface description 13 4.2.3.
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4.3.1: GMR2 transceiver antenna interface 18 4.3.1.1: External antenna requirements. 18 4.3.2: GPS receiver antenna interface 4.3.2.1: External GPS antenna requirements. 4.4: VAM-CM Power Management Handling AF T 4.4.0.1: VAM-CM USB interface PM Handling 4.4.0.2: VAM-CM UART interface PM Handling 19 19 20 20 20 4.5: Mechanical interface 20 4.6: Environmental conditions 21 5: Evaluation tools 22 5.1: Evaluation kit 22 5.2: Evaluation module 22 23 5.2.
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1: Purpose 1: Purpose DR AF T The purpose of this document is to describe the VAM-CM HW external interfaces. 4: GSPS Core Module 2.0 VAM-CM HW Description Confidential and Proprietary – Inmarsat Global Limited inmarsat.
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2: Scope 2: Scope This document describes the HW Interfaces of VAM-Core Module (VAM-CM). Interfaces of VAM-CM are dedicated for VAM manufacturers to interface their own satellite terminal UI and control electronics. The intended audiences are engineers from Inmarsat, LM, manufacturing partners, VAM manufacturers and Sasken and a working knowledge of the Inmarsat space segment and GMR2+ 2.1: References AF T specification is assumed. Reference Document Version VAM Tool User Guide 1.
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3: VAM-CM Overview 3: VAM-CM Overview The main goal in VAM-CM design is to utilize the IsatPhone 2 high level architecture and provide a compact core module with a simple single connector control interface to enable board to board connection. 3.1: VAM Terminal Architecture A GSPS VAM terminal shall consist of a VAM-CM that is interfaced via and controlled by a VAM AF T controller board.
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Figure 2. VAM-CM AF T 3: VAM-CM Overview Due to the simple and compact interfaces, testing and evaluation of the VAM-CM requires interface extension to enable easier access to control and indication signals. The VAM-CM Evaluation Module available from Inmarsat provides easier and more convenient interfacing to the VAM-CM during terminal test and evaluation phases. 3.2.
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DR AF T 3: VAM-CM Overview Figure 3. Block diagram of IsatPhone 2v1 VAM-CM 8: GSPS Core Module 2.0 VAM-CM HW Description Confidential and Proprietary – Inmarsat Global Limited inmarsat.
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3: VAM-CM Overview DR AF T 3.3.2: VAM Control interface Figure 4. VAM control interface The VAM control interface is marked with a blue dashed line in Figure 3 above.Figure 4 shows the VAM Control and ID interface and pin header connector. VAM Control and ID interface includes the following baseband interfaces; for more detail, see VAMCM interfaces on page 11. > System USB > Direct USB interface to access VAM-CM for direct controls and firmware updates.
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3: VAM-CM Overview > Analog Audio interface > Analog audio in (Ext Mic) and audio out (Ex Ear) signals. > Digital Audio interface > Digital PCM audio interface > Power Supply interface AF T > Power supply for VAM-CM > Control and ID interface > Digital operating mode controls > This interface includes VAM CM boot mode pins to initialize VAM CM in correct operating mode. (Control interface, audio interface, modem reset etc.) DR > This interface also includes some informative data from VAM CM.
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4: VAM-CM interfaces 4: VAM-CM interfaces This chapter describes all VAM-CM external interfaces. These interfaces are divided into three sections; VAM Control and ID interface, radio interface and mechanical interface. In addition there are also several test points located in the PWB which can be used for debugging and verification purposes. Pin numbers for signals are subject to change during the development phase of the device. DR AF T Figure 5 shows the location of the interfaces in the VAM-CM.
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4: VAM-CM interfaces Signal Description Min Max Unit PWR on/off Power on/off control 0 4,5 V Supply Supply voltage 2,1 4,5 V Vio IO system voltage -0,5 5,5 V Table 1. Absolute maximum ratings 4.2: VAM Control interface description AF T The VAM control interface is a combination of digital and analog baseband interfaces dedicated to control the VAM-CM. The Interface also includes other user interface related signals like USIM and audio.
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4: VAM-CM interfaces Pin Signal Description #21 VBUS Supply voltage, 5,5V max #23 Dp Digital data #25 Dm Digital data #27 GND Signal GND Table 3. System USB interface pins AF T 4.2.2: USIM interface description The USIM interface provides USIM interface from the VAM-CM to VAM terminal for easier user access. The USIM reader in VAM terminal should be placed so that trace length from VAM control interface to USIM reader shall not exceed 300mm.
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4: VAM-CM interfaces 4.2.3.1: Voltage levels The UART control bus is equipped with level shifter in VAM-CM board. This solution enables VAM to adjust I/O voltage system by applying own V_io voltage to VAM control interface connector. Voltage requirements for logic levels are shown in Table 2. More details in chapter Power Supply interface description on page 16. 4.2.3.2: Interface control UART control interface operation modes can be set using AT commands.
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4: VAM-CM interfaces Pin Signal In/Out Description #33 dig_Au_Dr In Data in #37 GND GND Table 7. Digital audio interface pins 4.2.5.1: Voltage levels The Digital audio bus is equipped with level shifter in the VAM-CM board. This solution enables VAM to adjust I/O voltage system by applying own V_io voltage to VAM control interface connector. AF T Voltage requirements for logic levels are shown in Table 2. For more details, see Power Supply interface description on page 16. 4.2.5.
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AF T 4: VAM-CM interfaces Figure 8. PCM Protocol – Mode 2 Data Format 4.2.6: Power Supply interface description The Power supply interface contains multiple pins to share high current flow of one pin to several pins. Additional grounding pins are spread out for different sub-interfaces. Digital interfaces to VAM-CM processor (DM3725) are connected via level shifters. VAM terminal can determine the interface voltage level by applying interface voltage in V_io pin (#15) of VAM-CM system connector.
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4: VAM-CM interfaces Back-up voltage is internally supplied in VAM-CM meaning that if 3v9 Supply is available for VAMCM, also internal back-up voltage is present. Powering off the VAM-CM does not shut down internal back-up voltage supply. Omission of Ext Vrtc supply has influence only in case that 3v9 Supply is cut off for some reason. Back-up voltage keeps on the slow clock (32kHz), RTC date information and GPS satellite status information.
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4: VAM-CM interfaces 4.2.8.1: Signal conditions The Control and ID interface is equipped with level shifter in VAM-CM board. This solution enables VAM to adjust I/O voltage system by applying own V_io voltage to VAM control interface connector. For more details, see Power Supply interface description on page 16. Power on/off is not controlled via level shifter. Power on/off is pull down type control having internal pull-up resistor for "HIGH-state" implemented in VAM-CM board.
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4: VAM-CM interfaces min max Unit Pass band impedance 50 50 Ohms Pass band gain 2 dBic Extended band gain 0 dBic Axial ratio 4 dB Extended band Axial ratio 6 dB Extended band frequencies: RX 1518…1525MHz, TX 1668…1675MHz AF T Table 11. GMR external antenna requirements 4.3.2: GPS receiver antenna interface The GPS receiver Antenna interface uses snap on SMB connector JAE SMB003D00 to provide cost efficient and robust interfacing for RF signal.
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4: VAM-CM interfaces 4.4: VAM-CM Power Management Handling The VAM-CM power management handling is based on VAM-CM control interface, UART or USB. This is required to put CM in low power mode to reduce CM power consumption. 4.4.0.1: VAM-CM USB interface PM Handling In the VAM-CM USB control interface, core module (CM) supports USB suspend/resume feature as per USB2.0 standards to put in low power mode.
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4: VAM-CM interfaces DR AF T Figure 12. Side view dimensions Figure 13. Rear view dimensions 4.6: Environmental conditions Environmental operating conditions for VAM-CM are shown in Table 14. Min Nominal Max Unit Operating temperature -20 +25 +70 Celsius degrees Humidity 90 Vibration 0 % 0,96 m2/s2 5 Hz to 20 Hz 0,96 m2/s2 20 Hz to 100 Hz (30 minutes/axis) (thereafter -3dB/octave) Table 14. Environmental requirements 21: GSPS Core Module 2.
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5: Evaluation tools 5: Evaluation tools This chapter gives more detailed information concerning the evaluation module and control software included in evaluation kit. 5.1: Evaluation kit The VAM-CM evaluation kit includes VAM-CM evaluation module, control software and documentation. VAM terminal manufacturer can use evaluation kit to verify the VAM-CM functionality AF T by controlling VAM-CM directly with control SW.
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AF T 5: Evaluation tools DR Figure 15. VAM-CM Evaluation module break down 5.2.1: Evaluation module size The evaluation board is designed to hold the VAM-CM module and standard interface connectors, control switches and indicators. Dimensions of Evaluation board shown in Figure 16 are 80mm by 130mm by 14,4mm excluding the extension length of parts reaching through the mechanical structure. 23: GSPS Core Module 2.0 VAM-CM HW Description Confidential and Proprietary – Inmarsat Global Limited inmarsat.
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5: Evaluation tools Figure 16. VAM-CM Evaluation board dimensions Mechanical structure of evaluation module is milled aluminium. Dimensions of mechanical structure DR AF T shown in Figure 17 are 90mm by 140mm by 20,6mm excluding the rubber feet. Figure 17. VAM-CM Evaluation module dimensions 5.2.2: Evaluation module interfaces This chapter describes the outer Indicators and interfaces of VAM-CM evaluation module. Interface location can be seen in Figure 18.
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DR AF T 5: Evaluation tools Figure 18. VAM-CM Evaluation module interface locations Each interface is described in following chapters. Following chapters also indicate the special arrangements when pin headers are applied instead of standard interfaces. Pin numbers for signals are subject to change during R&D phase of the device. 5.2.2.1: Indicators Evaluation module includes LED indicators showing the status information of the system. Available status information is shown in Table 15.
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5: Evaluation tools Boot selection switch S2003 is located at bottom side of PWB available only with pin tool via small hole in mechanics. This button is used to make VAM-CM to boot from USB device to start firmware upgrade tool or enable direct USB flashing. Boot selection is required during R&D phase firmware updates. VAM-CM control buttons are shown in Table 16. SW Control Description S1001 PWR on/off Power on/off switching of VAM-CM. AF T S1002 Modem RST Warm reset for VAM-CM.
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5: Evaluation tools 5.2.2.3: USB Interface USB interface is implemented with Keystone Electronics 924 B-type USB connector CN-1001. Signal order in connector is. Pin Control Description USB Bus voltage #2 Dm Negative data line #3 Dp Positive data line #4 GND AF T #1 VBUS Table 18. USB interface signals 5.2.2.4: VAM control interface The evaluation module control interface CN1005 includes most of VAM-CM controls. Only audio interface is separated to its own pin header.
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5: Evaluation tools Pin Control Description #18 VAM_ Modem OK MODEM_ OK #19 Modem Warm reset for VAM-CM RST "LOW" Warm reset for VAM-CM "HIGH" (Float) no action TTA Not OK #21 VAMCM Sleep Modem has no GPS location or channel assignment AF T #20 Indicates VAM-CM sleep mode status “HIGH” – Modem Active “LOW” – Modem Sleep #22 SIM_V SIM supply voltage output #23 VAM_ Control interface selection (UART/USB) during power-up BOOT_1 "HIGH" (Float) UART control mode (default) "LOW" USB contr
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5: Evaluation tools 5.2.2.5: UART Interface UART interface is implemented with single row 6 way pin header CN1007. Applied interface is commonly used interface and allows commercially available USB/UART cable e.g. FTDI TTL-232R3v3 adapter cable. Pin header type is Harwin M20-9730645. Signal order in pin header is shown in following Table 20. Pin organization is shown in Figure 21. Pin Control Description #1 GND AF T #2 NC #3 NC #4 RXD Received data #5 TXD Transmit data #6 NC DR Table 20.
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5: Evaluation tools Signal Description #10 AN_AUD_EXT_MIC Analog audio input #2 AN_AUD_EXT_EAR Analog audio output #3 AGND_1 GND for analog audio #4 AGND_1 GND for analog audio #5 GND GND for digital audio #6 GND GND for digital audio #7 DIG_AU_DX Digital audio transmit data #8 DIG_AU_CLK #9 DIG_AU_DR #10 DIF_AU_FS AF T Pin Digital audio clock Digital audio receive data Digital audio frame sync DR Table 22. Audio pin header interface Figure 22.
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5: Evaluation tools Supply voltage requirement for evaluation module is 5V with 1A continuous current supply capability (4A peak). Power supply interface is protected with 2A SMD fuse. Pin configuration of power supply interface is shown in Table 24. Pin Signal Description #1 Center Vsupply +5 V, 4A peak #2 Body GND GND Table 24. ower supply interface signals AF T 5.2.2.
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DR AF T 5: Evaluation tools Figure 23. VAM-CM Control tool screen shot 32: GSPS Core Module 2.0 VAM-CM HW Description Confidential and Proprietary – Inmarsat Global Limited inmarsat.