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Command and Data Handling

Command and Data Handling. Yousef Alyousef Michael Li. Introduction. Command and Data Handling subsystem is responsible for computing and control of subsystem functions. The core of this subsystem is a single-board computer powered by the Motorola PowerPC 823e from Embedded Planet. RPX Lite.

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Command and Data Handling

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  1. Command and Data Handling Yousef Alyousef Michael Li

  2. Introduction • Command and Data Handling subsystem is responsible for computing and control of subsystem functions. • The core of this subsystem is a single-board computer powered by the Motorola PowerPC 823e from Embedded Planet.

  3. RPX Lite • SDRAM: 64M • FLASH: 16M • NVRAM: 128K • Real-Time Clock • Interfaces: • USB • RS-232 Serial • PCMCIA • Ethernet: 10BaseT • SPI, I2C …

  4. Requirements

  5. Power Consumption

  6. System Block Diagram FLIGHT COMPUTER (5V, 1A) General Purpose I/O Pins USB RESET SMC1 SMC2 I2C PCMCIA TIP-MASS RS232 Serial RS232 DRIVER (5V, 7mA) SCIENCE USB Interface 802.11b (5V, 1A) CPLD CPLD (5V, 150mA) MULTIPLEXER (5V) THERMAL THERMAL INTERFACE INTERFACEBOARD ADCS TNC RADIO EPS Multiple Wires COMM Wireless

  7. USB Interface Vcc Select +5V GND Camera0 D+ D+ D- MUX D- +5V GND Camera1 D+ D-

  8. Temp. Sensor Thermal Interface Flight Computer Sensor select for temperature reading Digital Temp. readings select ADC Sensors in different parts of DINO MUX 10k +5V Temp. Sensor

  9. Voltage proportional to temperature change Temperature-controlled Variable Resistor Temperature Sensors

  10. Watchdog and Reset Decoder • These will be implemented in CPLD

  11. Parts List

  12. Test Plans • ADC testing requires accompanying software. • All other interface board functionality can be confirmed with logic analyzer and multimeters.

  13. Issues and Concerns

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