Team 2 Bluetooth Mass Storage Device By Ryan

Team 2: Bluetooth Mass Storage Device By Ryan Weaver Preliminary PCB Layout and Design Narrative Ryan Weaver Scott Pillow Yucel Parsak Yuri Kubo 1

Team 2: Bluetooth Mass Storage Device By Ryan Weaver Review of Design Constraints • Connect a host PC via Bluetooth • Connect a host PC via USB • Transfer data to/from PC via Bluetooth or USB • Automatically charge onboard battery via USB • Manage file system (browse, select, delete) Ryan Weaver Scott Pillow Yucel Parsak Yuri Kubo 2

Team 2: Bluetooth Mass Storage Device By Ryan Weaver PCB Design Constraints • USB (D+/ D- Lines) • Bluetooth Module • Oscillators • Power Supply Ryan Weaver Scott Pillow Yucel Parsak Yuri Kubo 3

Team 2: Bluetooth Mass Storage Device By Ryan Weaver USB • D+/ D- Lines • Full Speed Transfer Rate of 12 Mbit/s • Susceptible to EMI (0. 0– 0. 3 V for low and 2. 8– 3. 6 V for high) • Isolate the D+/ D- traces (Preferred spacing >10 mm) • Trace lengths within 2 mm of each other (Preferred length 20– 30 mm) • Ground plane under D+/ D- traces Ryan Weaver Scott Pillow Yucel Parsak Yuri Kubo 4

Team 2: Bluetooth Mass Storage Device By Ryan Weaver Bluetooth Module • Antenna • Influenced by other components and metal • 2 mm proximity clearance • Mounting • Stacked above board • Mechanical security Ryan Weaver Scott Pillow Yucel Parsak Yuri Kubo 5

Team 2: Bluetooth Mass Storage Device By Ryan Weaver Oscillators • Low-power nature • Sensitive to rapidly changing signals • Located as close as possible to microcontroller • No traces passing within the oscillator circuit (other than VSS or VDD) • Grounded guard ring can be used Ryan Weaver Scott Pillow Yucel Parsak Yuri Kubo 6

Team 2: Bluetooth Mass Storage Device By Ryan Weaver Power Supply • DC to DC Converter • Minimize ground bounce and noise • Keep IC’s GND and ground leads of I/O filter capacitors < 5 mm apart • Maximize output power and efficiency/ Minimize output ripple voltage • Use a GND plane and solder the IC’s GND pin to GND plane • High-frequency output noise reduced by a 0. 1μF ceramic capacitor in parallel with the output filter capacitor Ryan Weaver Scott Pillow Yucel Parsak Yuri Kubo 7

Team 2: Bluetooth Mass Storage Device By Ryan Weaver Preliminary PCB Layout Overview Ryan Weaver Scott Pillow Yucel Parsak Yuri Kubo 8

Team 2: Bluetooth Mass Storage Device By Ryan Weaver Questions? Ryan Weaver Scott Pillow Yucel Parsak Yuri Kubo