QB50 System Requirements Document

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