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Sponsored by the RIT EE Department

P08331 – Microcontroller Board and Tutorial. Adam Geboff – Team Lead, PCB Layout Jason Marini – Software Development, Documentation Rob Dunn – Power Systems, PCB Layout Prof. Slack – The Man In Charge. Sponsored by the RIT EE Department. Purpose. Problem

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Sponsored by the RIT EE Department

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  1. P08331 – Microcontroller Board and Tutorial Adam Geboff – Team Lead, PCB Layout Jason Marini – Software Development, Documentation Rob Dunn – Power Systems, PCB Layout Prof. Slack – The Man In Charge Sponsored by the RIT EE Department

  2. Purpose Problem • Senior Design teams panic when it comes to microcontrollers Solution • Have a powerful evaluation board available to students in order to build quick prototypes, allowing them to modify the design of the board for their final product.

  3. Requirements • Ready-made layout • Bill of Materials for board population • Recent TI DSP • Debug capabilities • CD containing • Plenty of documentation • Sample code • Schematic and layout files

  4. Selected Concept TI TMS320F2809 processor • 128K Flash • 18K RAM • 100MHz PLL frequency • 32-bit integer operations • 16 PWM outputs • Multiple interfaces • SPI, SCI, CAN, I2C • 16 12-bit ADC channels • 35 GPIO pins • C/C++ support with Code Composer

  5. Selected Concept MatchPort embedded webserver • 802.11b/g support • Eight CPs (configurable pins) • Can provide remote-control inputs to DSP • Two CPs are used for I2C communication with on-board temperature, voltage, and current sensors. • RS-232 and 100-BaseT support • Telnet debug, TFTP upgradeability • SCI used to program DSP

  6. Selected Concept Onboard Sensors • MAX6652 temperature/voltage monitor • Monitors four voltage levels • LTC2481 • High-resolution voltage monitor • Used to calculate current across sense resistor All sensors use I2C to communicate with the MatchPort. The MatchPort acts as master, addressing each IC one at a time to obtain status updates. Current status is displayed on a custom webpage.

  7. Wireless Debug MatchPort TI controller

  8. Scalability Designed for scalability • PC104 interface used in anticipation of future DSPs with higher pin counts • Schematics have already been created for two additional (stackable) boards • Playground board (I/Os, debounced switches, LEDs) • Probe board (test points for each signal)

  9. Documentation Board Manual • Documents all features and board layouts • Diagram of processor and I/O boards • How to program the DSP • Application suggestions • Do’s and Don’ts • Extending the design to a new PCB • Schematics and sample code provided on a CD • “Quick start” guide to get user up and running • Correct power input • Example code from TI

  10. Challenges/Solutions Challenges • PCB manufacturer had poor quality control (2 out of 5 boards had bad traces) • Team member destroyed DSP with solder • Lack of intimate knowledge of process or technology • Only one team member with programming skills Solutions • Thoroughly tested each PCB before population • Begged and pleaded for overnight delivery of a new DSP, revoked said member’s soldering privileges • Consulted knowledgeable professors • Other members looked up relevant information

  11. Testing Layout Errors • GPIO lines connected directly to the MatchPort as well as through the CPLD • CPLD I/Os are set to 1.8V instead of 3.3V • 10K pullup needed on I2C Data line • Test Point 5 mysteriously disappeared • CPLD JTAG header is proprietary Xilinx 6-pin • Source and Drain swapped on P-channel FETs for active low LED’s • Clock too fast on the CPLD (1MHz instead of 10Hz) Power Regulation • PTCs take too long to respond • Reset signals on regulators are outputs, not inputs • PCB manufacturer does not plate non-round holes on prototypes

  12. Successes/Failures Successes • All discovered problems with the PCB layout have been corrected in the layout and back-annotated in the schematics. • I2C interface only took eight hours to implement correctly. • CPLD state machine. • MatchPort to DSP hardware interface. • Functional and polished Web interface. Failures • Power system does not respond quickly to improper voltage situations. • Replace PTCs with fast-acting resettable fuses. • PCB costs prohibited the production of revision 2 of the DSP board as well as Playground and Probe boards. • TI does not yet have a kernel we can use for upload of binary code wirelessly to DSP. • Not enough time for GPIO Pin Packet idea (web interface displays status of all DSP I/Os)

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