The LM3S2139 microcontroller is based on the ARM Cortex-M3 controller core operating at 25 MHz, with 64 kB single-cycle flash, 16 kB single-cycle SRAM, CAN controller, Systick timer, three 32-bit or six 16-bit general purpose timers, watchdog timer, SSI / SPI controller, I2C interface, three analog comparators, two UARTs, 10-bit analog-to-digital converter (ADC) with 4 input channels, low drop-out voltage regulator, brown-out reset, power-on reset controller, and up to 56 GPIOs.

32-Bit RISC Performance

• 25-MHz operation with 32-bit ARM® Cortex™-M3 architecture
• Thumb®-compatible Thumb-2-only instruction set, with hardware-division and single-cycle-multiplication
• Integrated Nested Vectored Interrupt Controller (NVIC)
• Memory protection unit (MPU)

On-Chip Memory

• 64-KB single-cycle flash
• 16-KB single-cycle SRAM

Flexible Timer Capability

• Three general-purpose timers, each configurable as one 32-bit or two 16-bit timers
• Real-Time Clock (RTC) capability
• 24-bit system (SysTick) timer
• 32-bit watchdog timer

CAN Controller

• One CAN controller supporting CAN protocol version 2.0 A/B
• 32 message objects, each with its own identifier mask
• Bit rates up to 1 Mb/s
• Disable automatic retransmission mode for TTCAN

Serial Interfaces

• One synchronous serial interfaces (SSI) with master and slave modes for SPI, Microwire, or TI synchronous serial
• One I2C interfaces (master and slave)
• Two 16C550-type UARTs with IrDA support

Analog-to-Digital Converter (ADC)

• Single- and differential-input configurations
• Four 10-bit channels (inputs) when used as single-ended inputs
• Sample rate up to two hundred fifty thousand/second

Analog Comparators

• Three independent integrated analog comparators
• Configurable for output to: drive an output pin, generate an interrupt, or initiate an ADC sample sequence
• Compare external pin input to external pin input or to internal programmable voltage reference

GPIOs

• Up to fifty-six 5-V-tolerant input/outputs
• Programmable interrupt generation
• Fast toggle capable of a change every two clock cycles
• Programmable slew-rate control
• Programmable drive strength

Power

• On-chip Low Drop-Out (LDO) voltage regulator
• 3.3-V supply brown-out detection

Package

• 100-pin RoHS-compliant LQFP
• Industrial operating temperature (-40°C to +85°C)