ECE¶

NOTES¶

• Provide ESD protection for all ICs that don't have inbuilt (+/- 15 kilovolts)
• Reverse current protection
• Zener Diodes on stepper driver outputs
• Sonar, encoders, motor drivers, accelerometer cliff sensors, and stepper driver are already included in $220 base system cost and are listed in the spreadsheet for information only.

PROCESSOR¶

• Arm<--->AVR
  • UART
  • ARM programs the AVR, can cycle power to the AVR
  • ARM sends command packets to AVR
  • AVR configured to broadcast data packets at set intervals

• ARCH
  • Charging
    • 2.0A Limit
    • Charging lithium-ion batteries (http://www.batteryuniversity.com/partone-12.htm)
    • Portable Devices Need High-Performance Battery Chargers (http://www.maxim-ic.com/appnotes.cfm/an_pk/721/)
    • Intersil IS16291 LiIon Charging IC
      • Supports USB Charging
      • ($3.30)
    • Maxim
    • National LP3947
    • Only for single cell, so doesn't really meet our needs
  • Protection
    • Our battery packs (Li-Ion 18650) have 2 of these PCBs onboard
      • http://www.batteryspace.com/pcbfor74vli-ion1865018500batterypacks7alimit2round.aspx

ACCESSORIES¶

(See AccessoryDesign for more details)

• Must Identify Type
  • Use analog out to identify type of module
• Networked
  • Can bus multiple modules together on the expansion port

• Smart
  • Uses I2C && AVR Pins

• Dumb
  • Only AVR Pins