Team 3 Humphrey's Treasure Chest Design Constraint Analysis Roy Scheck Tony Liechty Charles Lan Steve Kingsley
MIDI-phone Volume Control PreAmp Filter DSP D+ USB interface Buttons Microphone PreAmp Filter DSP ATD USB interface D+ Buttons 2 GPIO SPI D- GPIO 10 LCD Parallel
USB Controllers MAX3420E ($2.65) USB Peripheral Controller with SPI Interface Allows any microcontroller with SPI to be connected over USB. All software/firmware put in DSP Communicated to USB controller over SPI http://datasheets.maxim-ic.com/en/ds/MAX3420E.pdf
DSP requirements 1 ATD converter At least 8 bits Needs an SPI interface for SPI to USB controller 12 GPIO pins 2 pins for buttons 10 pins for parallel LCD interface
DSP Freescale’s 56F8014 ($3.15) 32 total pins Two 12-bit ATDs SPI, SCI, I2C, PWM interface 21 GPIO When only SPI and 1 ATD is used http://www.freescale.com/files/dsp/doc/data_sheet/56f8014.pdf