PRELIMINARY PCB LAYOUTSeraj DosenbachGreg LammersBeau MorrisonAnanya 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(14.4-12 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 Hbridge

Micro-Controller

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?