OBC User Manual Rev1
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USER MANUAL Onboard Computer (OBC) Type II ONBOARD COMPUTER OBC TYPE II – USER MANUAL 1 Change Log........................................................................................................................4 2 Acronyms List.....................................................................................................................5 3 Description .........................................................................................................................6 4 Product Performance And Properties..................................................................................6 5 Electrical Characteristic.......................................................................................................7 6 Interface Diagram ...............................................................................................................8 7 Communication Interfaces ................................................................................................10 7.1 7.2 7.3 7.4 7.5 8 CAN ..................................................................................................................................... 10 USART and UART ................................................................................................................ 11 SPI ....................................................................................................................................... 13 I2C........................................................................................................................................ 14 Six General Purpose Outputs................................................................................................ 14 Attitude determination and control system ........................................................................14 8.1 8.2 8.3 8.4 8.5 9 Compass ............................................................................................................................. 14 Accelerometers .................................................................................................................... 15 Sun sensors ......................................................................................................................... 15 Temperature sensors............................................................................................................ 15 Magnetorquers control ......................................................................................................... 15 OBC ProtoBoard Area ......................................................................................................16 9.1 9.2 9.3 9.4 9.5 USB interface ....................................................................................................................... 16 External PCB (Payload) ......................................................................................................... 17 Stripboard grid ..................................................................................................................... 18 Atomic Clock Ready ............................................................................................................. 19 SD Card Holder .................................................................................................................... 19 10 Connector pinout..............................................................................................................20 10.1 10.2 10.3 10.4 10.5 10.6 10.7 10.8 10.9 10.10 10.11 Connectors location ............................................................................................................. 20 H1 & H2 Stack Connector .................................................................................................... 21 PAN1, PAN2 and PAN3........................................................................................................ 23 PAN4, PAN5 and PAN6........................................................................................................ 23 JP2 ...................................................................................................................................... 24 JP14 .................................................................................................................................... 26 J1 ........................................................................................................................................ 26 JP15 .................................................................................................................................... 27 CN1 ..................................................................................................................................... 28 SD1 .................................................................................................................................. 28 P1 .................................................................................................................................... 29 ENDUROSAT 2 ONBOARD COMPUTER OBC TYPE II – USER MANUAL 11 Mechanical Characteristics ...............................................................................................30 12 Assembling.......................................................................................................................31 13 Envinronmental And Mechanical Tests ..............................................................................31 14 Included In The Shipment .................................................................................................31 15 Handling And Storage.......................................................................................................31 16 Warnings ..........................................................................................................................32 ENDUROSAT 3 ONBOARD COMPUTER OBC TYPE II – USER MANUAL ONBOARD COMPUTER (OBC) TYPE II USER MANUAL This user manual is specially designed to detail the EnduroSat onboard computer (OBC) type II, functions and features. Please read carefully the manual before unpacking the OBC in order to ensure safe and proper use. Figure 1 – Onboard computer (OBC) type II 1 CHANGE LOG Date 20/06/2018 ENDUROSAT Version Rev 1 Note Initial document 4 ONBOARD COMPUTER OBC TYPE II – USER MANUAL 2 ACRONYMS LIST ASIC Application Specific Integrated Circuit CAN Controller Area Network COM-port Communication Port CSAC Chip Scale Atomic Clock ECSS European Cooperation Space Standardization ESA European Space Agency ESD Electrostatic Discharge GEVS General Environmental Verification Standard. GND Ground GPS Global Positioning System I2C Inter-Integrated Circuit OBC Onboard Computer PCB Printed Circuit Board PWM Pulse Width Modulation RAM Random-Access Memory RBF Remove Before Flight RF Radio Frequency SD card Secure Digital Card SPI Serial Peripheral Interface UART Universal Asynchronous Receiver/Transmitter UHF Ultra-High Frequency USART Universal Synchronous Asynchronous Receiver Transmitter USB Universal Serial Bus ENDUROSAT 5 ONBOARD COMPUTER OBC TYPE II – USER MANUAL 3 DESCRIPTION The EnduroSat onboard computer type II is a low power consumption and high performance computing platform for nanosatellites, fully compatible with the CubeSat standard. It is based on ARM Cortex M4 with frequency rate up to 180MHz or optionally on ARM Cortex M7 processor with frequency rate up to 216 MHz. It comes with integrated double redundancy sensors: 3-Axis accelerometers and compass. PWM drivers for magnetorquers and inputs for sun sensors, temperature sensors and gyroscope allow the implementation of the attitude determination and control systems. Customized interfaces and connectors allow high flexibility of the unit. A Protoboard area on the PCB allows high customization ideal for test bed and fast prototyping. It is possible to connect additional PCB through connectors and mounting holes and to integrate easily additional sensors and chips such as atomic clocks, GPS receiver and so on. 4 PRODUCT PERFORMANCE AND PROPERTIES • • • • • • • • • • • • • • • • • ARM Cortex M4/M7 processor; Frequency rate: up to 180 MHz for M4, up to 216 MHz for M7; 2MB Program Memory Size; 256kB RAM for M4, 2MB RAM for M7; 2048kB flash memory; MicroSD card slot; Integrated double redundancy sensors: 3-axis accelerometer and compass; 3x PWM drivers for magnetorquers; 6x analog inputs for sun sensor; 6x external temperature sensors can be connected; Three external gyroscope can be connected Interfaces: CAN, 2x USART, UART, 2x I2C, 2x SPI, USB (VCP); Real Time Clock Flexible frequency eco-mode; Weight: 58 g. 1Gbit Serial NOR Flash Memory 64Mbit Static RAM (Optional) Connector for antenna deployment ProtoBoard area for easy connection of payload and access to main power and communication busses. ENDUROSAT 6 ONBOARD COMPUTER OBC TYPE II – USER MANUAL 5 ELECTRICAL CHARACTERISTIC Parameter Unit Supply voltage V Supply current mA Condition Min Typ 3 Max 3.3 3.6 STM32F427 @185Mhz 104 123 mA STM32F427 @120Mhz 58 72 mA STM32F427 @60Mhz 30 38 mA STM32F427 @16Mhz 13 27 1 µA 3-Axis Accelerometer – Normal Mode µA 3-Axis Accelerometer – Low Power Mode1 1 µA 3-Axis Accelerometer – Power Down Mode µA 3-Axis Digital Compass – Power Down Mode2 200 400 8 12 0.1 2 1 2 280 mA 3-Axis Digital Compass - Measurement Mode – Low Power Mode 3-Axis Digital Compass - Measurement Mode2 – High Resolution Mode Ext. 64M-bit Static RAM (Opt.), F = 18Mhz 45 55 mA Ext. 64M-bit Static RAM (Opt.), F = 1Mhz 7.5 9 µA Ext. 64M-bit Static RAM (Opt.), Stand-By Mode Ext. 1Gbit NOR Flash Memory Operational Mode @108Mhz 8 48 4 15 6 6 µA mA 40 (fast-read extended I/O) mA Ext. 1Gbit NOR Flash Memory Operational Mode @54Mhz (fast-read extended I/O) mA mA Ext. 1Gbit NOR Flash Memory Operational Mode @108Mhz (fast-read dual I/O) Ext. 1Gbit NOR Flash Memory Operational Mode @108Mhz (Operating current (fast- 18 20 read quad I/O) µA Bi-directional PWM Outputs Operating Temperature Storage Temperature 1 mA °C °C Ext. 1Gbit NOR Flash Memory Operational Mode Stand by Mode @3.3V 200 3000 -30 85 25 - Current consumption is for one 3-Axis Accelerometer. The OBC has two identical sensors on the same location, but on opposite sides of the PCB. 2 - Current consumption is for one 3-Axis Digital Compass. The OBC has two identical sensors on the same location, but on opposite sides of the PCB ENDUROSAT 7 ONBOARD COMPUTER OBC TYPE II – USER MANUAL 6 INTERFACE DIAGRAM ENDUROSAT 8 ONBOARD COMPUTER OBC TYPE II – USER MANUAL Two 3-Axis Accelerometer I2C 64-Mbit Static RAM (Opt.) Two 3-Axis Digital Compass I2C Six Outputs for Sun Sensors Analog Three H-Bridges Outputs for Magnetorquers PWM/Direction Six Outputs for Temperature Sensors SPI Three Outputs for Gyroscopes SPI MCU ARM Cortex-M4/M7 SPI 1-Gbit Flash Memory SD Card Holder Figure 2 – OBC microcontroller periphery ENDUROSAT 9 ONBOARD COMPUTER OBC TYPE II – USER MANUAL 7 COMMUNICATION INTERFACES 7.1 CAN The EnduroSat On-board computer has a CAN bus interface using a 3.3-V CAN transceiver. External modules can be connected throughout H1-1 and H1-3 of the PC/104 connector. Same interface can be reached from the ProtoBoard area through JP2 and JP14 connectors (TLE-110-01G-DV), for this purpose zero Ohm resistors R72 and R73 should be mounted as shown in Figure 4. Figure 3 – Protoboard area customization Figure 4 ENDUROSAT 10 ONBOARD COMPUTER OBC TYPE II – USER MANUAL 7.2 USART and UART The EnduroSat onboard computer provides two USART and one UART interfaces. The first USART interface (H1-33 and H1-35) is used by the UHF transceiver of the EnduroSat platform. Second USART interface is left free for the payload (H1-19 and H1-20). If the USB peripheral is mounted (Figure 5), this interface is used for UART to USB communication (Virtual COM Port). Figure 5 – USB peripheral location Mounting zero Ohm resistors on R62 and R63 gives access to this interface through the connectors JP2 or JP14 on the ProtoBoard as shown in Figure 6. Figure 6 ENDUROSAT 11 ONBOARD COMPUTER OBC TYPE II – USER MANUAL For USB (VCP) R62, R63, R67 & R68 as shown on figure 7 Figure 7 For USART on “P1-USB” R82, R81 as shown on figure 8. Figure 8 Moreover, the same interface can be used for communication with atomic clock if it is mounted on the ProtoBoard area (Microsemi Quantum™ SA.45s CSAC). To realize the communication with the atomic clock, zero ohm resistors – R62, R63, R64 and R65 have to be mounted as shown in Figure 9. ENDUROSAT 12 ONBOARD COMPUTER OBC TYPE II – USER MANUAL Figure 9 UART – is free for payload and it can be access through H1-39 / H1-40 (EnduroSat EPS Opt.). 7.3 SPI Two 3.3V SPI interfaces are provided. In the EnduroSat CubeSat platform the first SPI interface (H2-9, H2-10, H2-11, H2-15 and H2-16 of the PC104 connector) is used for the EnduroSat S-Band transceiver. The second SPI interface (H2-47, H2-48, H2-49 and H2-50 of the PC104 connector) can be used for the payload or for generic user needs. The second SPI interface also can be accessed through JP2 or JP14 of the ProtoBoard area mounting zero Ohm resistors R74, R75, R76 and R77 as shown in Figure 10. Figure 10 ENDUROSAT 13 ONBOARD COMPUTER OBC TYPE II – USER MANUAL 7.4 I2C Two 3.3V I2C interfaces are provided. First I2C interface (H1-41 and H1-43 of the PC104 connector) can be used as main interface among all the subsystems of the satellite. Second I2C interface (H1-21 and H1-23 of the PC104 connector) can be used for the payload and to control the deployment of the EnduroSat UHF Antenna through the connector J1 located on the ProtoBoard area. To realize the access through JP2 or JP14, zero Ohm resistors R69 and R70 and have to be mounted (Figure 11). Figure 11 7.5 Six General Purpose Outputs The OBC Module has five general purpose outputs. Each output can be switched between 3.1V and Ground. All outputs are protected with diodes. In this way other modules can control the same outputs (there are 10k pull-down resistors on the EnduroSat EPS Type I Module). Diode OR gate can be realized. 8 ATTITUDE DETERMINATION AND CONTROL SYSTEM The EnduroSat Onboard computer comes with an embedded array of sensors for the attitude determination and outputs for magnetorquers control. 8.1 Compass Two 3-axis digital compass designed for low-field magnetic sensing with high-resolution are added to the OBC periphery. Both sensors are located at the same place, but on opposite sides of the OBC. The compass is based on magneto-resistive sensors plus an ASIC containing amplification, automatic ENDUROSAT 14 ONBOARD COMPUTER OBC TYPE II – USER MANUAL degaussing strap drivers, offset cancellation, and a 12-bit ADC that enables 1° to 2° compass heading accuracy. Compass utilizes Anisotropic Magneto-resistive (AMR) technology that provides advantages over other magnetic sensor technologies. These anisotropic, directional sensors feature precision in-axis sensitivity and linearity. These sensors’ solid-state construction with very low crossaxis sensitivity is designed to measure both the direction and the magnitude of Earth’s magnetic fields, from milli-gauss to 8 gauss. 8.2 Accelerometers Two high-performance ultra low-power 3-axis accelerometers are added to OBC periphery. Both of them are placed at the same location but on opposite site of the PCB. Accelerometers has dynamic user-selectable full-scales of ±2g/±4g/±8g and is capable of measuring accelerations with output data rates from 0.5 Hz to 1 kHz 8.3 Sun sensors Six analog inputs for sun sensors. At the current OBC design filters and amplification is optimized to EnduroSat Solar Panels Sun Sensors. 8.4 Temperature sensors Six external temperature sensors with SPI communication interface can be connected to the OBC. 8.5 Magnetorquers control Three independent outputs for control the magnetorquers. The control of magnetorquers is realised with H-Bridge with 3.3V and maximum output current of 3A. Sensor Parameter Unit Condition gauss Full scale Min Typ Max Two 3-Axis Digital Compass Measurement Range Sensitivity LSb/gauss -16 +16 ±4 6842 ±8 3421 ±12 2281 ±16 1711 1370 Two 3-Axis Accelerometer Measurement range Output Data Rate ENDUROSAT ±2g/±4g/±8g Hz 0.5 1000 15 ONBOARD COMPUTER OBC TYPE II – USER MANUAL 9 OBC PROTOBOARD AREA 9.1 USB interface Additional USB interface can be provided on the ProtoBoard area. This interface gives accessibility to an external device/PC (Master device) to communicate with the OBC Microcontroller (Slave device). OBC USB interface is based on IC FT232RL - UART to USB interface (Virtual COM Port). Full driver support can be found at http://www.ftdichip.com. The EnduroSat On-Board Computer type II comes with electronic components for USB Interface already mounted on it. The USB interface can be accessed from PC/104 connector (Tx) H-19 and (Rx) H-20. Moreover, it can be also accessed from 20pin headers “JP2” of the top side of the OBC through 11pin Rx/12pin Tx or “JP14” from bottom side through 12pin Rx / 11pin Tx. To realize the access through “JP2” and “JP14”, zero Ohm resistors R62, R63, R67 and R68 have to be mounted as shown in Figure 7. Two types of connectors can be used to access the USB Interface: standard USB Mini B Connector (USB1) or Molex 53398-0471 (P1). When EnduroSat Solar Panel with RBF and interface connector are used in the platform, connection through it and the OBC Molex 53398-0471 can be realized with EnduroSat 4 pin cable. In this way the OBC USB interface can be accessed with the external EnduroSat USB adapter also when the CubeSat is fully assembled. Both USB connectors can be connected to the ProtoBoard Connectors “JP2” (DM – pin3 / DP – pin4) and “JP14” (DM – pin4 / DP – pin3) when zero Ohm resistors are mounted on R83 and R84 (Figure 12). Figure 12 ENDUROSAT 16 ONBOARD COMPUTER OBC TYPE II – USER MANUAL 9.2 External PCB (Payload) External PCB (Payload) can be connected to the connector located on the ProtoBoard Area. Additional mounting holes аrе also provided. The ProtoBoard connector is the 20pin SAMTEC TLE-110-01-GDV. One is on the top side (JP2) of the OBC and the other on the bottom (JP14 -Not Mounted). This allows to minimize the used space inside the satellite and easily access to different communication interfaces and power supply. The interfaces on the ProtoBoard connectors should be chosen very carefully, because they are shared between with main PC/104 connector. All pins of ProtoBoard connectors are separated from the rest of the OBC when zero Ohm resistors are not mounted. Each pin of the ProtoBoard connector has its own testing point located just next to it for research and developing purposes. All test points are plated holes with pitch 0.1inch (2.54mm) and diameter of 0.060inch. Figure 13 – External PCB ENDUROSAT 17 ONBOARD COMPUTER OBC TYPE II – USER MANUAL 9.3 Stripboard grid For developing and prototyping purposes an area of OBC is left as a stripboard grid with 11 holes on 16 strips. All holes are plated with grid spacing of 0.1inch(2.54mm) and diameter of 0.060inch. All holes in the first strip are connected to the 5V BUS, in the second strip to 3.3V BUS and the last one to GND. These power strips can be recognized by the square rings. Figure 14 ENDUROSAT 18 ONBOARD COMPUTER OBC TYPE II – USER MANUAL 9.4 Atomic Clock Ready On the protoboard area, there are mounting holes for Quantum™ SA.45s Chip Scale Atomic Clock (CSAC) from Microsemi. UART interface can be connected through zero Ohm resistors. Access to other pins of the atomic clock can be realized with plated holes next to each pin. Figure 15 9.5 SD Card Holder Direct access to SD Card holder is enable through 12pin connector JP15 – Molex 53398-1271. The SD card is shared between high speed data payload and OBC to resend trough the RF communication module. ENDUROSAT 19 ONBOARD COMPUTER OBC TYPE II – USER MANUAL 10 CONNECTOR PINOUT 10.1 Connectors location Figure 16 - OBC - top side - Connectors location ENDUROSAT 20 ONBOARD COMPUTER OBC TYPE II – USER MANUAL Figure 17 - OBC – bottom side - Connectors location 10.2 H1 & H2 Stack Connector ENDUROSAT 21 ONBOARD COMPUTER OBC TYPE II – USER MANUAL H1 Pin Mnemonic Description H1-1 CANL CAN communication Low (3.3V) H1-3 CANH CAN communication High (3.3V) H1-19 H1-20 PAY_TX PAY_RX USART payload transmit data USART payload receive data H1-21 H1-23 H1-33 H1-35 H1-39 PAY_SCL PAY_SDA UHF RX UHF TX SYS_TX I2C for payload I2C for payload USART UHF module transmit data (optional EnduroSat EPS) USART UHF module receive data (optional EnduroSat EPS) UART transmit data H1-40 SYS_RX UART receive data H1-41 SYS_SDA I2C between sub-systems H1-43 SYS_SCL I2C between sub-systems H2 Pin Mnemonic Description H2-3 OBC_OUT1 Universal Output 1 H2-4 OBC_OUT2 Universal Output 2 H2-5 H2-6 OBC_OUT3 EN_OBC Universal Output 3 Enable OBC (to turn on the OBC) H2-7 H2-8 H2-9 H2-10 OBC_OUT5 OBC_OUT6 SPI MISO SPI MOSI Universal Output 5 Universal Output 6 SPI MISO SPI MOSI H2-11 SPI SCK SPI SCK H2-13 SPI TR SPI TR H2-15 SPI CS SPI CS H2-16 H2-25 SPI IRQ +5V SPI IRQ +5V BUS H2-26 H2-27 H2-28 H2-29 H2-30 H2-31 H2-32 +5V 3V3 3V3 GND GND GND GND +5V BUS +3.3V BUS +3.3V BUS Ground Ground Ground Ground ENDUROSAT 22 ONBOARD COMPUTER OBC TYPE II – USER MANUAL H2-47 H2-48 H2-49 H2-50 PAY_MISO PAY_MOSI PAY_SCK PAY_NCS SPI Payload SPI Payload SPI Payload SPI Payload 10.3 PAN1, PAN2 and PAN3 Picoblade 12 pins connectors PAN1, PAN2 and PAN3 are located on the top side of the OBC as shown in Figure 16. Pin Mnemonic Description 1 NC Not connected 2 NC Not connected 3 GND Vgyro Ground Power for gyroscope 9 SPI CS1 SPI MOSI AGND PhotoDiode SPI SCK SPI chip select for gyroscope SPI (for gyroscope and temperature sensor) Photodiode Analog Ground Photodiode signal SPI (for gyroscope and temperature sensor) 10 SPI MISO SPI (for gyroscope and temperature sensor) 11 12 +3.3V +3.3V BUS power supply for sensors SPI CS2 SPI chip select for temperature sensor 4 5 6 7 8 10.4 PAN4, PAN5 and PAN6 ENDUROSAT 23 ONBOARD COMPUTER OBC TYPE II – USER MANUAL Picoblade 12 pins connectors PAN4, PAN5 and PAN6 are located on the bottom side of the OBC as shown in Figure 17. Pin Mnemonic Description 1 PWMB PWM (in/out) 2 PWMA PWM (out/in) 3 GND Vgyro Ground Power for gyroscope 9 SPI CS1 SPI MOSI AGND PhotoDiode SPI SCK SPI chip select for gyroscope SPI (for gyroscope and temperature sensor) Photodiode Analog Ground Photodiode signal SPI (for gyroscope and temperature sensor) 10 SPI MISO SPI (for gyroscope and temperature sensor) 11 12 +3.3V +3.3V BUS power supply for sensors SPI CS2 SPI chip select for temperature sensor 4 5 6 7 8 10.5 JP2 ENDUROSAT 24 ONBOARD COMPUTER OBC TYPE II – USER MANUAL JP2 Mnemonic Description 1 +5V +5V BUS 2 +3.3V +3.3V BUS 3 USB D- USB data - 4 USB D+ USB data + Pin Not connected 5 6 PAY SCL I2C payload 7 CAN L CAN Low (3.3V) 8 PAY SDA I2C payload 9 CAN H CAN High (3.3V) 10 GND Ground 11 PAY Rx USART receive data 12 PAY Tx USART transmit data 13 GND Ground 14 OUT1 Universal output 1 15 PAY MISO SPI payload 16 GND Ground 17 PAY MOSI SPI payload 18 GND Ground 19 PAY NCS SPI payload 20 PAY SCK SPI payload ENDUROSAT 25 ONBOARD COMPUTER OBC TYPE II – USER MANUAL 10.6 JP14 JP14 Mnemonic Description 1 +3.3V +3.3V BUS 2 +5V +5V BUS 3 USB D+ USB data + 4 USB D- USB data - 5 PAY SCL I2C payload Pin Not connected 6 7 PAY SDA I2C payload 8 CAN L CAN Low (3.3V) 9 GND Ground 10 CAN H CAN High (3.3V) 11 PAY Tx USART transmit data 12 PAY Rx USART receive data 13 OUT1 Universal output 1 14 GND Ground 15 GND Ground 16 PAY MISO SPI payload 17 GND Ground 18 PAY MOSI SPI payload 19 PAY SCK SPI payload 20 PAYNCS SPI payload 10.7 J1 Figure 18 ENDUROSAT 26 ONBOARD COMPUTER OBC TYPE II – USER MANUAL J1 Mnemonic Description 1 +5V +5V BUS 2 Ant_SCL / OUT1 I2C UHF antenna / Universal output 1 3 Ant_SDA GND I2C UHF antenna Ground Mnemonic Description 1 GND Ground 2 GND Ground 3 SD_EN SD_D2 SD Enable SD data 2 9 SD_D3 SD_CMD SD_DET SD_CK SD_D0 SD data 3 SD command I/O SD detect SD clock SD data 0 10 SD_D1 SD data 1 11 GND Ground Pin 4 10.8 JP15 Pin 4 5 6 7 8 ENDUROSAT 27 ONBOARD COMPUTER OBC TYPE II – USER MANUAL GND Ground Mnemonic Description 1 +3.3V +3.3V BUS 2 NJRST JTAG Test nReset 3 JTDI JTMS-SWDIO JTAG Test Data Input JTAG Test Mode Selection / Serial Wire Data I/O 9 JTCK-SWCLK JTDO NRST BOOT0 GND JTAG Test Clock / Serial Wire Clock JTAG Test Data Output External Reset Boot Configuration Ground 10 GND Ground Pin Signal Description 1 Data2 Data signal 1 2 Data3 Data signal 2 3 4 CMD I/O GND input and output command supply voltage negative 5 VDD supply voltage positive 6 CLK clock signal 7 GND supply voltage negative 8 Data0 data signal 0 9 Data1 data signal 1 12 10.9 CN1 Pin 4 5 6 7 8 10.10 SD1 ENDUROSAT 28 ONBOARD COMPUTER OBC TYPE II – USER MANUAL 10.11 P1 Figure 19 Pin Mnemonic Description 1 +5V +5V USB 2 USB_DM USB data - 3 USB_DP GND USB data + Ground 4 ENDUROSAT 29 ONBOARD COMPUTER OBC TYPE II – USER MANUAL 11 MECHANICAL CHARACTERISTICS In the following paragraphs main dimensions of the Onboard Computer are shown. All dimensions are in mm. STEP file can be provided upon request. Figure 20 - OBC top view Figure 21 - OBC side view Figure 22 - OBC - side view ENDUROSAT 30 ONBOARD COMPUTER OBC TYPE II – USER MANUAL 12 ASSEMBLING Production process follows quality standard: • • • • • PC-A-610E, class 3 (Acceptability of Electronic Assemblies) IPC-A-600 (Acceptability of printed boards) J-STD-001 (Requirements for Soldered Electrical and Electronic Assemblies) ISO 14644 (Cleanrooms and associated controlled environments) IEC 61340 (Electrostatics ESD: Protection of electronic devices from electrostatic phenomena) Conformal coating: • • Outgassing requirements: NASA SP-R-0022A Thickness tolerance: NASA-STD-8793. 13 ENVINRONMENTAL AND MECHANICAL TESTS A full campaign of tests at qualification level was performed on the onboard computer qualification engineering model. Qualification tests level and duration follow the ESA standard ECSS-E-ST-10-03C and GEVS: GSFC-STD-7000A. Test performed: • • • • • Thermal Cycling Thermal Vacuum Random Vibration Sine Vibration Shock Test Space qualification campaign link: https://www.endurosat.com/space-qualification/ 14 INCLUDED IN THE SHIPMENT EnduroSat provides along with the Onboard computer: • • 15 USB drive with user manual JTAG programming cable HANDLING AND STORAGE Particular attention shall be paid to the avoidance of damage to the onboard computer during handling, storage and preservation. The handling of the on board computer module should be performed in compliance with the following instructions: • Handle using PVC, latex, cotton (lint free) or nylon gloves. ENDUROSAT 31 ONBOARD COMPUTER OBC TYPE II – USER MANUAL • • • 16 The environment where on board computer module will be handled shall meet the requirements for a class 100,000 environment, free of contaminants such dust, oil, grease, fumes and smoke from any source. Store in such a manner as to preclude stress and prevent damage. To prevent the deterioration, the power module must be stored in a controlled environment, i.e. the temperature and humidity levels shall be maintained in the proper ranges: o Ideal storage temperature range: 15ºC to 27ºC o Ideal storage humidity range: 30% to 60% relative humidity (RH) WARNINGS This product uses very fragile components. Observe precautions for Handling. This product uses semiconductors that can be damaged by electrostatic discharge (ESD). Observe precautions for Handling Sensitive Electronic device. Do not ship or store near strong electrostatic, electromagnetic, magnetic or radioactive fields. ENDUROSAT 32 ONBOARD COMPUTER OBC TYPE II – USER MANUAL ENDUROSAT 33
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