Texas Instruments Stellaris LM3S1968, Руководство пользователя

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Hardware Description
14 January 6, 2010
Serial Wire Out
The evaluation board supports the Cortex-M3 serial-wire output (SWO) trace capabilities. Under
debugger control, the CPLD can route the SWO datastream to the virtual communication port
(VCP) transmit channel. The debugger can then decode and interpret the trace information
received from the VCP. The normal VCP connection to
UART0
is interrupted when using SWO. Not
all debuggers support SWO. Refer to the Stellaris LM3S3748 data sheet for additional information
on the trace port interface unit (TPIU).
Organic LED Display
The EVB features an Organic LED (OLED) graphics display with 128 x 96 pixel resolution. OLED
is a new technology that offers many advantages over LCD display technology. The display is
protected during shipping by a thin, protective plastic film. The film can be removed using a pair of
tweezers.
Features
„
RiT Display P14201 series display
„
128 columns by 96 rows
„
High-contrast (typ. 500:1)
„
Excellent brightness (120 cd/m
2
)
„
Fast 10 us response
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. 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. A GPIO (
PH3/FAULT
) is assigned
to turn on and off the controller as necessary for power rail sequencing. When the OLED display is
operating, a small amount of power can be drawn from the +15-V supply 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.
Further Reference
For additional information on the RiT OLED display, visit www.ritekdisplay.com .