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ISUAL Associated Electronics Package

ISUAL Associated Electronics Package. C. Ingraham. Associated Electronics Package (AEP). Associated Electronics Package (AEP) Mechanical Layout Thermal Control Power System Data Processing Unit Mass Memory Imager Interface Spectrophotometer Interface Array Photometer Interface

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ISUAL Associated Electronics Package

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  1. ISUAL Associated Electronics Package C. Ingraham

  2. Associated Electronics Package (AEP) • Associated Electronics Package (AEP) • Mechanical Layout • Thermal Control • Power System • Data Processing Unit • Mass Memory • Imager Interface • Spectrophotometer Interface • Array Photometer Interface • Digital Signal Processor NCKU UCB Tohoku Assoc Elect Package C. Ingraham

  3. AEP Mechanical Layout (1) • Seven Subassemblies • Subass’y = PCB plus Aluminum Frame • PCB Frame = Slice of Enclosure • Top and Bottom Covers • Bottom Subass’y has Mounting Ears • Ten Skewer Rods Secure Stack NCKU UCB Tohoku Assoc Elect Package C. Ingraham

  4. AEP Mechanical Layout (2) NCKU UCB Tohoku Assoc Elect Package C. Ingraham

  5. AEP Mechanical Layout (3) • I/O Connectors in Frame at Board Edge • Stacking Connectors for Inter-Board Connections • No Motherboard Needed • Simple Mechanical Arrangement • Fewer Connections • Short Signal Paths • Good Radiation and EMI Shielding • Good Thermal Path • Easy Assembly/Disassembly • Allows Incremental Development NCKU UCB Tohoku Assoc Elect Package C. Ingraham

  6. AEP Thermal Control • Heat Transfer by Conduction • Component Leads to PCB • PCB to Frame • Frame to Deck • Hottest Subassembly at Deck • Hottest Components at board edge near Frame • At Least One Thermistor per Subass’y • Each Thermistor at Hottest Component NCKU UCB Tohoku Assoc Elect Package C. Ingraham

  7. AEP Power System (1) • DC-to-DC Converters • Power Circuit Switching • Current Limiting • Monitoring NCKU UCB Tohoku Assoc Elect Package C. Ingraham

  8. AEP Power System (2) • Low Voltage Power Supply (1) • Input Filter • d.c.-to-d.c. Converters • Modular Devices 2680R Family • Dual Redundant +/-12 volt Converter • Dual Redundant +5 volt Converter • Independent Inputs • Shunt-Wired Outputs • Ground Isolation • Input Range Exceeds S/C Spec • Output Filter NCKU UCB Tohoku Assoc Elect Package C. Ingraham

  9. AEP Power System (3) • Low Voltage Power Supply (2) • Input Current Monitors • Relay-Switched 28-V to Array Photometer • Nominal or Redundant Power to Array Photometer • Low-Z Thermal Path to Deck • Two Temperature Monitors • Contained in Shielded Cavity • Proven In IMAGE FUV Instrument NCKU UCB Tohoku Assoc Elect Package C. Ingraham

  10. AEP Power System (4) • Power Controller • Receives d.c. Power from LVPS • Individually Switched Power Services • Flexible Power Control • Able to Isolate Abnormal Loads • Voltage and Current Monitors • Valuable Diagnostic Information • Approx. 106 Analog Housekeeping Channels • Fold-back Current Limiting • Protects Load • Protects Power System • Two Thermal Monitors NCKU UCB Tohoku Assoc Elect Package C. Ingraham

  11. AEP Data Processing Unit (DPU) (1) • DPU Functions • Receives Commands • Sends Status • Sends Telemetry • Manages Mass Memory • Manages Power System • Controls Instrument NCKU UCB Tohoku Assoc Elect Package C. Ingraham

  12. AEP Data Processing Unit (DPU) (2) • DPU Organization • 8085 CPU • Rad Hard, Simple, Byte wide, Low Power • Proven in Space Missions • 16 Kilobytes PROM • Baseline Flight Software • Power Switched (High Power) • 128 Kilobytes SRAM • Flight Software Execution • Settings, Stack, Tables • Telemetry DMA Source NCKU UCB Tohoku Assoc Elect Package C. Ingraham

  13. AEP Data Processing Unit (DPU) (3) DPU Block Diagram SpacecraftInterface(RS-422) DPU Board 8085 CPU Science Telemetry Sci Telem To Imager MCP, Imager Phosphor, SP & AP HVPS 4 PR HV Control (FPGA) Engr. Telemetry Engr. Telem 1 PR Daylight Sensor Command Rx Commands Diag. Port (EGSE) 1 PR To ImagerTo SPTo AP Time Rx Timing CDI Sender 1 PR To ImagerTo SP 16 KB PROM STIM To DSP DSP Handshake 128 KB RAM To LVPS and Power Controller Power Control Logic 128 KB EEPROM To Mass Memory Mass Memory I/f NCKU UCB Tohoku Assoc Elect Package C. Ingraham

  14. AEP Data Processing Unit (DPU) (4) • DPU Organization (Continued) • 128 Kilobytes EEPROM • Operating Parameter Tables • Static Settings • Alternate Flight Software Versions • Command Receiver • Status Telemetry Transmitter • Science Telemetry Transmitter • Command & Data Interface NCKU UCB Tohoku Assoc Elect Package C. Ingraham

  15. AEP Data Processing Unit (DPU) (5) • DPU Organization (Continued) • I/O for Instrument Control • High Voltage Control • Bank Switching and Memory Map • Watchdog Reset Timer • Diagnostic Test Port NCKU UCB Tohoku Assoc Elect Package C. Ingraham

  16. AEP Data Processing Unit (DPU) (6) • Command & Data Interface • Three-Wire Serial Interface (Data, Clock, Strobe) • Eight-Bit Address Plus 16-Bit Data • 2 Mb/s; about 14 microseconds per command NCKU UCB Tohoku Assoc Elect Package C. Ingraham

  17. AEP Mass Memory (MM) (1) • One Gigabit • Static RAM • 128 Mbytes • Accessible by 8- or 32-Bit Words • Stores Raw and Compressed Science Data • Multi-Port • DSP • DPU • Array Photometer • Spectrophotometer • Imager NCKU UCB Tohoku Assoc Elect Package C. Ingraham

  18. AEP Mass Memory (MM) (2) Mass Memory Block Diagram NCKU UCB Tohoku Assoc Elect Package C. Ingraham

  19. AEP Mass Memory (MM) (3) • Low Power • Error Detection and Correction • Automatic 1-bit Error Correction • 2-bit Error Detection • Error Counters • Latchup Detection • Power Isolation? • Controlled by DPU NCKU UCB Tohoku Assoc Elect Package C. Ingraham

  20. AEP Mass Memory (MM) (4) • Buffer Allocation • Controlled by DPU • Circular or Linear • Continuous Fill • Freeze on Event • Anywhere in MM • Several Binary Sizes NCKU UCB Tohoku Assoc Elect Package C. Ingraham

  21. AEP Mass Memory (MM) (5) • DSP MM Interface • Fast, Memory Mapped, Direct Access, Read/Write • High Priority • DPU MM Interface • Slower, Memory Mapped, Direct Access, Read/Write • Low Priority • Bank Switched into 8085 Memory Space • Telemetry by PCVF Blocks NCKU UCB Tohoku Assoc Elect Package C. Ingraham

  22. AEP Mass Memory (MM) (6) • Imager MM Interface • Fast, Sequential DMA • Write Only • Circular or Linear Buffer NCKU UCB Tohoku Assoc Elect Package C. Ingraham

  23. AEP Mass Memory (MM) (7) • Spectrophotometer MM Interface • Fast, Sequential DMA • Write Only • Circular Buffer • Array Photometer MM Interface • Fast, Sequential DMA • Write Only • Circular Buffer NCKU UCB Tohoku Assoc Elect Package C. Ingraham

  24. AEP Imager Interface • Controlled by DPU CDI • Imager Status • Start Signal from DPU or Trigger • Fast Transfer to Mass Memory • Buffers in Mass Memory NCKU UCB Tohoku Assoc Elect Package C. Ingraham

  25. AEP Spectrophotometer Interface (1) • Six Channels • Integrates Charge from PMT • 12-bit A/D Converter per Channel • Sampled at 10 kHz per Channel • Continuously Fed to MM Circular Buffer • Digital Processing of Selected Channel for Sprite Trigger • Adjustable Trigger Threshold NCKU UCB Tohoku Assoc Elect Package C. Ingraham

  26. AEP Spectrophotometer Interface (2) Spectrophotometer Interface Block Diagram NCKU UCB Tohoku Assoc Elect Package C. Ingraham

  27. AEP Array Photometer Interface • +28 Volts from Power Controller • DMA Channel to Mass Memory • Circular Buffer in Mass Memory • Interface Characteristics TBD NCKU UCB Tohoku Assoc Elect Package C. Ingraham

  28. AEP Digital Signal Processor (DSP) • Fast, Direct Access to Mass Memory • Command Block Interface with DPU • Details per NCKU NCKU UCB Tohoku Assoc Elect Package C. Ingraham

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