QB50 System Requirements Document

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FIPEX on QB50 Date: 06.02.2013--- DRAFT---- Issue: 1.0.2ICD Page: 9 / 2519 STM _TH_RET_3- Surface Thermal Monitor THERMISTOR - RETURN for CH320 STM _TH_RET_4 Surface Thermal Monitor THERMISTOR - RETURN for CH421 SU_TH_RET Science Unit THERMISTOR – signal RETURN22 RDY_SCN Screen for RDY23 SDA_SCN Screen for SDA24 SCL_SCN Screen for SCL25 GND System GROUNDTable 2-1 Instrument Connector Pin AssignmentPower PinsThe +5, +3V3 and the GND connections are duplicated to provide redundancy in theharness.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
FIPEX on QB50 Date: 06.02.2013--- DRAFT---- Issue: 1.0.2ICD Page: 10 / 25The CubeSat computer shall read the science data packet and time-stamp the packet within1 second of the RDY flag being asserted2.2 Science Unit I2C Control InterfaceThe I2C interface shall be used to control the SU from the OBC.The I2C interface shall be designed to the specifications given in [AD-3].The CubeSat OBC shall be the I2C MASTER, all other I2C interfaces shall be SLAVES.The 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 [AD-3].The I2C shall have a timeout of 200ms. After this timeout the I2C interface shall be reset.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.Science Unit I2C Command Packet StructureThe following packet structure shall be used to transmit commands from the OBC to the SU:CMD_ID:LEN:Param_n:XOR:one BYTE value for command identifierone BYTE value representing the number of 8-bit BYTES to follow the LENparameter. Value ranging from 2 to 252parameters sent in BYTE format - LS BYTE is sent first if parameter is a 16-bitWORDtwo BYTE XORSee section 0 for details of commands. The packet size is limited to 256 Byte.Science Unit I2C Reponses Packet StructureThe following packet structure shall be used to transmit responses from the SU to the OBC:Name:ILR-RFS_FPXQB50_ICD_1000
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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
Page 16 and 17: 3. Display which ground station is
Page 18 and 19: 2.3 Spacecraft ContaminationQB50-SY
Page 22: 4.1 MechanicalAs shown in Figure 5,
Page 25 and 26: Attachment A: INMS Interface Contro
Page 27 and 28: CHANGE RECORDIssue Date Sections ch
Page 29 and 30: 5.9.4 OBC_SU_ON (0xFB) ............
Page 31 and 32: 2 Normative and Informative documen
Page 33 and 34: CUBESAT side connector to attach to
Page 35 and 36: 4.1.1 SWITCHED Power PinsThe +5, +3
Page 37 and 38: 4.4 Power BudgetThe power budget is
Page 39 and 40: 5.3 Command & Response Handling5.3.
Page 41 and 42: 5.4 Command Packet Structure to Sci
Page 43 and 44: 5.7 SU State Transition DiagramThe
Page 45 and 46: 5.9.2 Script TIME Field - @tTime-ta
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
Page 53 and 54: 5.10 Example SU Command Sequence Sc
Page 55 and 56: 7 Attitude ControlThe CubeSat shall
Page 57 and 58: Attachment B: FIPEX Interface Contr
Page 59 and 60: FIPEX on QB50 Date: 06.02.2013--- D
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Page 85 and 86: TITLE: QB50 m-NLP Science Unit Inte
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QB50 System Requirements Document

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