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S940 | 3U CompactPCI Digital I/O Board

The S940 radiation tolerant digital I/O board provides a variety of discrete TTL, opto-isolated RS422 and RS232 serial ports. It is designed to interface with typical satellite guidance, navigation and control sensors such as Space Integrated GPS/INS (SIGI), torque rods, solar array drive electronics, separate switches, reaction wheels and payloads with a UART interface.

  • Designed for LEO, Mars Terrestrial with an Option for GEO Environments
  • Single-Slot Conduction-Cooled 3U CompactPCI card
  • Twelve RS422 Outputs and Four RS422 Inputs: Space Integrated GPS/INS (SIGI) Interface – Sync Timer and Telemetry Serial Input, Star Tracker: Telemetry Serial Input and Command Serial Output
  • Two RS232 UART ports
  • Reaction Wheel Tachometer Interface
  • Separation Switch Closure Interface
  • Three 2A Rated H-Bridge Torque Rod Interface
  • Logic Discrete Output Drivers: SADE Pulse Generator and Registered Output
  • Two Opto-Isolated Discrete Output Drivers
  • Triple-Voted Buffered Memory for Serial Interface
  • 33 MHz, 32-bit PCI 2.1 Compliant CompactPCI Interface
  • Nominal Power Consumption is Less Than 14 Watts
  • Level-2 Components per NASA GSFC 311-INST-001A Specification are available

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