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?