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Start date: 2018-06-23

Goal: Design and produce a Linux-based handheld gamestation.

Roadmap

Set up

• Create the folder structure.
• Choose e-cad software. Eagle
• Create the e-cad project.
• Choose development environment.
• Create the software project.

Identify critical components

• Choose microcontroller. OSD3358-512M-BSM
• Choose LCD. Midas MCT050TC12W800480LML (FPC-connector)
• Choose LCD backlight driver MIC2287CYD5
• Choose controller method. PSP-like. Tactile buttons + joystick (FPC-connector)
• Choose battery. 2x cylindrical lithium batteries. Battery holders
• Choose power controller. Not needed as the OSD3358 has an internal Li-Ion battery circuit.
• Choose audio. Speaker using i2s codec with integrated mono amplifier. 3-pole 3mm jack Alternativ CODEC: TLV320DA
• Choose memory method. SD-Card (push-pull, bar or push-push) + Flash Memory

Schematic design

• Design the MCU circuit.

  • Make MCU symbol/footprint.
  • Design boot circuit.

• Design the power circuit.

  • Understand MCU power circuit.
  • Design clamping circuit between VDDSHV and SYS_VDD.
  • Design battery footprints.

• Design connectors.

  • Make USB connector symbol/footprint.
  • Make audio connector symbol/footprint.
  • Design USB ESD protection.
  • Design audio ESD protection.
  • Design SD card ESD protection.
  • Chassis ESD shielding.

• Design the display circuit.

  • Make LED driver symbol/footprint.
  • Make LCD symbol/footprint.
  • Design LED driver circuit.
  • Design LCD circuit.

• Design the controller circuit.

  • Make button symbol/footprint.
  • Make joystick symbol/footprint.
  • Design button circuit.
  • Design joystick circuit.

• Design the audio circuit.

  • Make DAC symbol/footprint.
  • Make amplifier symbol/footprint.
  • Make speaker symbol/footprint. JST PH 2.0mm connector.
  • Design amplifier circuit.
  • Design audio circuit.

• Design the memory circuit.

  • Make SD-card holder symbol/footprint.
  • Make flash symbol/footprint.
  • Design memory circuit.

PCB Design

Software