Seraj Dosenbach Greg Lammers Beau Morrison Ananya Panja Printed Circuit Board Layout Narrative plus Preliminary PCB Layout

PCB LAYOUT 3.45 inches 3.7 inches

MAIN PCB COMPONENTS TOP LAYER  2 H- Bridges  Microcontroller  Level Translator  Headers BOTTOM LAYER  Power supply

LAYOUT 1 – μC, MAX3232,HEADERS,CRYSTAL

TOP LAYER LAYOUT

BOTTOM LAYER LAYOUT

LAYOUT CONSIDERADTIONS-POWER SUPPLY  Using decoupling capacitors between the GND &VDD terminals of IC (Voltage Regulators)  Using bulk capacitors between the power terminals to decouple high frequency noise  Using PI filter (14.4 v-5v VRegulator) and LC filter( v VRegulator )  Have a single point power system- 1 main ground and power trace  Shorter and wider traces for power supply  Gnd and Power traces running parallel  Gnd trace very wide( >200 mils) because of high current

LAYOUT CONSIDERADTIONS-μC  Placing the crystal close to the MCU  Oscillator and reset line should not run parallel to the high current traces  Reference voltage of ADC lines should be connected to the direct power supply and not to digital Vcc & Gnd

LAYOUT CONSIDERADTIONS-OTHERS Hbridge Micro- Contro ller High switching current circuit Digital circuit Analog  Components placed according to the package design  Using 45 degree angle trace turns instead of 90 degrees to prevent acid trapping

Questions?