LM3S2939 Datasheet, PDF (43/749 Pages) Texas Instruments – Stellaris® LM3S2939 Microcontroller

Stellaris^® LM3S2939 Microcontroller
■ QEI
– Position integrator that tracks the encoder position
– Velocity capture using built-in timer
– The input frequency of the QEI inputs may be as high as 1/4 of the processor frequency (for
example, 12.5 MHz for a 50-MHz system)
– Interrupt generation on:
• Index pulse
• Velocity-timer expiration
• Direction change
• Quadrature error detection
■ Power
– On-chip Low Drop-Out (LDO) voltage regulator, with programmable output user-adjustable
from 2.25 V to 2.75 V
– Hibernation module handles the power-up/down 3.3 V sequencing and control for the core
digital logic and analog circuits
– Low-power options on controller: Sleep and Deep-sleep modes
– Low-power options for peripherals: software controls shutdown of individual peripherals
– 3.3-V supply brown-out detection and reporting via interrupt or reset
■ Flexible Reset Sources
– Power-on reset (POR)
– Reset pin assertion
– Brown-out (BOR) detector alerts to system power drops
– Software reset
– Watchdog timer reset
– Internal low drop-out (LDO) regulator output goes unregulated
■ Industrial temperature 100-pin RoHS-compliant LQFP package
■ Industrial-range 108-ball RoHS-compliant BGA package
1.2 Target Applications
■ Remote monitoring
■ Electronic point-of-sale (POS) machines
June 18, 2012
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Texas Instruments-Production Data