QB50 System Requirements Document

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4.1.4 Surface Thermal Monitor Thermistor LocationsChannels STM_TH[0,1,2,3,4] are located at TBD positions on the CubeSat solarpanels.Channels STM_TH[5] is located at TBD position on inside of the Science Unit.4.1.5 Science Unit ThermistorThe Instrument Connector provides connections to an internal Science Unit thermistor.This allows the OBC to monitor the temperature of the SU, even when the SU isswitched OFF.The position of the Thermistor inside the SU is TBD.4.1.6 Science Unit Serial InterfaceThe 3V3 I/O standard UART serial interface shall be used to control the SU from theOBC.The serial I/F settings to use shall be:BAUD Rate: 38400Data Width: 8-bitParity bit: No ParitySTART bit: ONESTOP bit: ONEThis BAUD rate is the minimum required in order to meet the science requirement forBURST mode, where data packets can be will be generated at up to every 259 msec.NOTE: The CubeSat team should account for the relatively slow times required to writeSU data packets to MASS-STORAGE cards in their design.Serial interface packet formats and ERROR handling are described in section 5.4.2 Sun SensorThe trade-off carried out for the INMS has shown that It is not feasible to mount thesun-sensor on the top surface of the SU (ram-direction).4.3 EMC requirementsTBI
4.4 Power BudgetThe power budget is shown in Table 4-2. These numbers are preliminary and are TBC.Mode Power at +5V (mW) Power at +3.3V (mW)Orbit average(Duty cycleaveraged)Maximum duringUnit operationsOrbit average(Duty cycleaveraged)Maximum duringUnit operationsStandby 3 279 1 100Full/BURSTState499 640 77 200Table 4-2 - Power BudgetSome further power saving may be possible by disabling internal power convertermodules (TBC).The maximum current capability will be approximately 0.2A for the power supply(including connector.)
Page 1 and 2: QB50System Requirementsand Recommen
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Page 7 and 8: 1. CubeSat System Requirements1.1 S
Page 9: Figure 3: 3U CubeSat extended volum
Page 12 and 13: possibility of using other team’s
Page 14 and 15: QB50-SYS-1.5.11. Every science pack
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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: 4.1.1 SWITCHED Power PinsThe +5, +3
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