Technical Communication Skills Practicum Hardware

Two Boards Our design features two boards: a System Board and a Daughter Board. The System Board (a development kit) includes the Cirrus Microprocessor, RAM, Audio, and USB peripherals. The Daughterboard, interfaced directly to the System Board, contains power management ICs and I/O peripherals, including several LCD ICs.

LCD Backplane Voltage

Clock Speed Divider The LCD Controller and microcontroller are interfaced through the uC’s external memory interface. The SDRAM clock output is 100 MHz, but the LCD controller data clock speed needs to be about 6 MHz. Dividing the SDRAM clock by 16 gives 6.25 MHz. A 4-bit clock divider is implemented on a PLD.

LCD Control Voltage LCD requires inputs of +16V and -10V for switching pixels, with current in the uA range. 7.2V, 5V, 3.3V, and 2.5V sources available. Charge pump will be used to generate the high-voltage inputs.

Questions?