QB50 System Requirements Document

Appendix 1. The CubeSat connector shall provide the signals as shown in Table 4-1.4.1 Science Unit Connector Definition+5V123456781415 16 1718 19 20+5V+3V3+3V3STM_TH_GO_1STM_TH_GO_3NC9101112132122 23 2425STM_TH_RET_0STM_TH_RET_1STM_TH_RET_2STM_TH_RET_3STM_TH_RET_4SU_TH_RETNCTX_SCNRX_SCNGNDSTM_TH_GO_0STM_TH_GO_2STM_TH_GO_4SU_TH_GOTXRXHV_DisarmGNDFigure 4-1 R/A MDM25_F Connector Pin-OutPin Signal Name Comment1 +5 SWITCHED Power for +5V logic2 +3V3 SWITCHED Power for +3V3 logic3 STM_TH_GO_0 Surface Thermal Monitor THERMISTOR – signal for CH04 STM _TH_GO_1 Surface Thermal Monitor THERMISTOR – signal for CH15 STM _TH_GO_2 Surface Thermal Monitor THERMISTOR – signal for CH26 STM _TH_GO_3 Surface Thermal Monitor THERMISTOR – signal for CH37 STM _TH_GO_4 Surface Thermal Monitor THERMISTOR – signal for CH48 SU_TH_GO Science Unit THERMISTOR – signal GO9 NC No connection10 TX Serial line to SEND data from SU to CubeSat11 RX Serial line to RECEIVE data from CubeSat to SU12 HV_Disarm RED TAG plug situated in CubeSat Access Hatch to DISABLE HV13 GND System GROUND14 +5 SWITCHED Power for +5V logic15 +3V3 SWITCHED Power for +3V3 logic16 STM _TH_RET_0 Surface Thermal Monitor THERMISTOR - RETURN for CH017 STM _TH_RET_1 Surface Thermal Monitor THERMISTOR - RETURN for CH118 STM _TH_RET_2 Surface Thermal Monitor THERMISTOR - RETURN for CH219 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 NC No connection23 TX_SCN Screen for TX24 RX_SCN Screen for RX25 GND System GROUNDTable 4-1 Instrument Connector Pin Assignment