QB50 System Requirements Document

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TITLE: QB50 m-NLP Science Unit Interface Control DocumentDoc. No. MSSL-QB50-ID-12001-DRAFT a4.2 Power PinsTable 4-1 Instrument Connector Pin AssignmentThe +5, +3V3 and the GND connections are duplicated to provide redundancy in theharness.4.3 GroundingThe Science Unit electronics shall be electrically grounded to the CubeSat structure viaGND. The Science Unit Chassis is electrically connected to the CubeSat structure at itspoints of attachment. The electrical resistance shall be
TITLE: QB50 m-NLP Science Unit Interface Control DocumentDoc. No. MSSL-QB50-ID-12001-DRAFT aThe I2C I/F shall operate at 100 kHz clock speed.The I2C interface shall use a 7-bit address field.The I2C address of the Science Unit shall be fixed as TBC.The capacitance of the I2C bus shall be as specified in ND2.The only asynchronous signal from the SU to OBC is the RDY.All other SU communication is in response to explicit commands issued by the OBC.4.8.1 Science Unit I2C Command Packet StructureThe following packet structure shall be used to transmit commands from the OBC to theSU:CMD_ID:LEN:Param_n:one BYTE value for command identifierone BYTE value representing the number of 8-bit BYTES tofollow the LEN parameterparameters sent in BYTE format - LS BYTE is sent first ifparameter is a 16-bit WORDSee section 0 for details of commands.4.8.2 Science Unit I2C Reponses Packet StructureThe following packet structure shall be used to transmit responses from the SU to theOBC:RSP_ID:LEN:data_n:one BYTE value for command identifierone BYTE value representing the number of 16-bit WORDS tofollow the LEN parameterdata represented in 16-bit WORD format - LS BYTE is sent firstSee section 0 for details of commands/responses.Page 10 of 27
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QB50System Requirementsand Recommen
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Science Payload Interface Control D
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1. CubeSat System Requirements1.1 S
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Figure 3: 3U CubeSat extended volum
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possibility of using other team’s
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QB50-SYS-1.5.11. Every science pack
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3. Display which ground station is
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2.3 Spacecraft ContaminationQB50-SY
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4.1 MechanicalAs shown in Figure 5,
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Attachment A: INMS Interface Contro
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CHANGE RECORDIssue Date Sections ch
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5.9.4 OBC_SU_ON (0xFB) ............
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2 Normative and Informative documen
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CUBESAT side connector to attach to
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4.1.1 SWITCHED Power PinsThe +5, +3
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4.4 Power BudgetThe power budget is
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5.3 Command & Response Handling5.3.
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Page 43 and 44: 5.7 SU State Transition DiagramThe
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Page 47 and 48: 5.9.9 SU_STIM (0x04)This command wi
Page 49 and 50: 5.9.12 SU_CALM (0x07)This command r
Page 51 and 52: 5.9.14 SU_HK (0x09)The HOUSE_KEEPIN
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Page 55 and 56: 7 Attitude ControlThe CubeSat shall
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QB50 System Requirements Document

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