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The electronics package for this device consists of a
mainboard/display controller and a single board computer, plus
an auxillary button board with 4 microswitches.
Main Board/Display Controller
The main board has the following features:
- Header for Gumstix single board computer
- 10 pin FPC connector with serial I/F for Gumstix and JTAG
for display controller CPLD
- 10 pin FPC connector for button board I/F
- 2 series cell Li-ion/Li-polymer switching charger
- Auto input power source selection (via LTC4412)
- Low battery detect circuit
- Battery disconnect switch
- Power management/conversion circuits
A Metrnonome 834 display controller is also implemented on the
board. This display controller is centered on a Xilinx CPLD
and also includes bias voltage generation and common plane
driving circuits.
Single Board Computer
The single board computer used is the Gumstix 400f-bt,
available from Gumstix,
Inc. This board is very compact, affordable, and packed with
features:
- 400MHz Xscale running Linux
- MMC card slot
- Bluetooth, USB, and serial interfaces
- Enough flash and RAM to do the job
- Excellent community support and documentation
Button Board
A very simple board with 4 switches mounted, which eventually
end up with laser cut acrylic buttons glued on top of
them. Interfaces to the main board using a 10 pin 0.5mm flat
cable.
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