Texas Instruments Stellaris LM3S6965, User Manual, Page: 14 / 27

Hardware Description
14 January 6, 2010
Control Interface
The OLED display has a built-in controller IC with synchronous serial and parallel interfaces.
Synchronous serial (SSI) is used on the EVB as it requires fewer microcontroller pins. Data cannot
be read from the OLED controller; only one data line is necessary. Note that the SSI port is shared
with the microSD card slot. The Stellaris® Firmware Development Package (included on the
Documentation and Software CD) contains complete drivers with source-code for the OLED
display.
Power Supply
A +15-V supply is needed to bias the OLED display. A FAN5331 device from Fairchild combines
with a few external components to complete a boost converter. When the OLED display is
operating, a small amount of power can be drawn from the +15-V rail to power other devices.
Design Guidelines
The OLED display has a lifetime of about 13,000 hours. It is also prone to degradation due to
burn-in, similar to CRT and plasma displays. The quickstart application includes both a screen
saver and a power-down mode to extend display life. These factors should be considered when
developing EVB applications that use the OLED display.
When using the EVB as an in-circuit debug interface (ICDI), the OLED display is held in reset to
reduce power consumption and eliminate display wear-out.
Further Reference
For additional information on the RiT OLED display, visit www.ritekdisplay.com .
Other Peripherals
Speaker
A small, magnetic audio transducer connects through a MOSFET to
PD1/PWM1
, allowing a range
of options for generating simple and complex tones. Use of the +5-V rail reduces switching noise
on the +3.3-V rail.
MicroSD Card Slot
Removable Flash cards are an ideal media for storing data such as web page content. The source
code on the CD includes example code for reading data from standard FAT formatted SD cards.
All data and control transactions use the SD card’s SPI mode. Note that the SD card specification
does not require that a card supports the SPI mode, but most cards do so in practice. Cards from
several vendors have been used with the EVB.
MicroSD cards are very small and require careful handling. the SD card slot on the EVB is a push-
push type (push to insert; push again to eject).
Note: To avoid damage, remove power before inserting or removing cards.The EVB does not
implement SD card power control.
Push Switches
The EVB has five general-purpose input switches. Four are arranged in a navigation-style
configuration. The fifth functions as a Select switch.