Описание
The Stellaris® LM3S2939 microcontroller is based on the ARM® Cortex-M3 controller core operating at up to 50 MHz, with 256 kB flash and 64 kB SRAM.The LM3S2939 also features real-time industrial connectivity, with a CAN controller, an SSI / SPI controller, an I2C interface, and 3 UARTs.The LM3S2939 microcontroller also features advanced motion control features, including 4 motion-control PWM outputs with dead-band, a quadrature encoder input for precise position monitoring,and a fault protection input for low-latency shutdown.The microcontroller also features intelligent analog capability, including 3 analog comparators and 3 channels of highly accurate 10-bit analog-to-digital conversion – with the ability to sample at speeds of 500K samples per second.Finally, the LM3S2939 microcontroller provides a 24-bit systick timer, 3 32-bit or 6 16-bit general-purpose timers, a watchdog timer, a battery-backed hibernation module with RTC and 256 bytes of non-volatile state-saving memory, a low drop-out voltage regulator so that only one supply voltage is required, brown-out reset, power-on reset controller, and up to 57 GPIOs.
32-bit ARM® Cortex™-M3 50-MHz processor core with System Timer (SysTick), integrated Nested Vectored Interrupt Controller (NVIC), Memory Protection Unit (MPU), and Thumb-2 instruction set
Full-featured debug solution with debug access via JTAG and Serial Wire interfaces, and IEEE 1149.1-1990 compliant Test Access Port (TAP) controller
256 KB single-cycle flash and 64 KB single-cycle SRAM
Lower-power battery-backed Hibernation module with Real-Time Clock
18-57 GPIOs (depending on configuration) with programmable control for GPIO interrupts and pad configuration
ARM FiRM-compliant Watchdog Timer ; plus three General-Purpose Timer Modules (GPTM), each of which provides two 16-bit timers/counters and can be configured to operate independently
10-bit Analog-to-Digital Converter (ADC) with three analog input channels and a sample rate of 500 thousand samples/second
Three fully programmable 16C550-type UARTs with IrDA support
Synchronous Serial Interface (SSI), supporting operation for Freescale SPI, MICROWIRE, or Texas Instruments synchronous serial interfaces
Inter-Integrated Circuit (I2C) Interface, providing Standard (100 Kbps) and Fast (400 Kbps) transmission and support for sending and receiving data as either a master or a slave
Controller Area Network (CAN) Interface using CAN protocol version 2.0 part A/B and with bit rates up to 1 Mbps
Three integrated analog comparators configurable for output to initiate an ADC sample sequence, drive an output pin or generate an interrupt
Two PWM generator blocks, each with one 16-bit counter, two PWM comparators, a PWM signal generator, a dead-band generator, and an interrupt/ADC-trigger selector
Quadrature Encoder Interface (QEI) featuring position integrator to track encoder position and velocity capture using built-in timer
Industrial and extended temperature RoHS-compliant 100-pin LQFP package and industrial-range RoHS-compliant 108-ball BGA package
