Texas Instruments Stellaris LM3S1968, User Manual

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Hardware Description
12 January 6, 2010
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Internal debug mode—By the USB device controller (U5 FT2232) when instructed by
debugger
The LM3S1968 microcontroller has an internal power-on reset, so the external circuits used in the
EVB are not required in typical applications.
Power Supplies
In normal operating mode, the LM3S1968 is powered from a +3.3-V supply. A low drop-out (LDO)
regulator co5-V power from the USB cable to +3.3-V. +3.3-V power is available for
powering external circuits.
If +5-V is removed, the Hibernation module will remain powered by the 3-V lithium battery. Other
microcontroller and board functions will not function until power is restored.