ISIS On Board Computer
Price on request – €4,400
- 400 MHz, power efficient ARM9 processor
- Multiple OS options available:
- FreeRTOS operating system for simple and lightweight cooperative multitasking
- KubOS Linux
- On-board telemetry: voltages, power-controller, and real time clock
- High reliability data storage and fail safe filesystem
- Flexible daughterboard architecture
- Robust design
- Includes Hardware Abstraction Layer Library
- Compliant with CubeSat standard
Brochure
Option Sheet
IGS
STEP
Availability: 8 – 12 weeks
- Description
- Properties
- Performance
- Interfaces
- Testing
- Software
- Daughter Boards
- In the box
Description
The ISIS On Board computer (IOBC) is a flight-proven, high-performance processing unit based around an ARM9 processor with a speed of 400 MHz, making it one of the most capable on-board computers for CubeSats, currently available on the market within the same price range. Its pluggable daughter board offers additional flexibility and customizability by providing a wide range of extra interfaces for payloads, sensors or actuators in a compact form factor.
- Operating Temperature: -25 degC to +65 degC
- Power Supply: 3.3V
- Dimension: 96 x 90 x 12.4 [mm] (including FM daughter board)
- Mass: 94g mainboard only, 100g with EM daughter board
- Power Consumption: 400mW average
- Processor: 400MHz 32-bit ARM9 processor
- Volatile Memory: 64MB SDRAM
- Code Storage: 1MB NOR Flash
- Critical Data Storage: 512kb FRAM
- Mass Data Storage: 2 x 2GB high reliability SD cards for fail safe data storage (up to 32 GB on request) or 2x any size standard SD cards
- I2C master or slave mode
- SPI master mode up to 8 slaves
- 2x UART (RS232 + RS232 / RS485 / RS422)
- General Purpose Input / Output pins (GPIO)
- ADC: 8 channel, 10-bit
- PWM: 6 channel
- JTAG for programming and debugging
- Dedicated debug LEDs and UART
- USB host and device
- Image sensor interface
Qualification and Acceptance testing
| Test | QT | AT |
| Functional | ✔ | ✔ |
| Vibration | ✔ | ‐ |
| Mechanical Shock | ✔ | ‐ |
| Thermal Cycling | ✔ | ✔ |
| Thermal Vacuum | ✔ | ‐ |
*QT is performed on the design/qualification model
*AT is performed on the unit to be shipped
Hardware Abstraction Layer Library
This library supports the following peripherals:
- I2C master mode
- I2C slave mode
- Pulse Width Modulation (PWM)
- UART (RS232, RS422, RS485)
- SPI master mode
- FRAM read and write
- SD card using failsafe FAT journalling filesystem
- Real-Time Clock (RTC) and OBC internal timer (RTT)
- Debug LED control
This library offers the following additional functionality:
- Checksumming (CRC-8, CRC-16, CRC-32)
- Interface to iOBC Supervisor
- Watchdog kicking
- Timekeeping
- FreeRTOS operating system
- AT91 library from Atmel
Example Daughter boards:
ISIS CORE DAUGHTER BOARD
- compatible with ISIS bus
- supported in ISIS Subsystems Library
- provides interfaces to ISIS solar panels (photodiode and temperature sensors)
- provides data interfaces (RS-422 and RS-232)
- provides power interfaces (switchable 3V3 and 5V lines)
GYROSCOPE DAUGHTER BOARD
- includes all ISIS Core daughter board functionalities and interfaces
- includes low-power MEMS gyro
MAGNETIC CONTROL DAUGHTER BOARD
- includes all ISIS Core daughter board functionalities and interfaces
- includes 3-axis magnetometer
- includes 6 PWM and H-bridges to control magnetorquers
EXAMPLE USE CASES
PEASSS
- provides various payload control signals and interfaces while performing simultaneous data acquisition for several payloads
NCLE
- provides hot redundant CAN interface and solid state recorder data output to Chang’e-4 relay satellite currently at the Earth-Moon L2 point
PicSat
- provides power and data interfaces to the payload and ADCS subsystems
- iOBC main board
- JTAG programmer / debugger + USB cable
- Adapter board (including debugging UART to USB conversion) + USB cable
- 2 x 2 GB high-reliability SD cards
- Power break-out board for easy connection to the power supply
- USB drive containing manuals, iOBC SDK installer, and applicable software libraries
