Texas Instruments LM3S301-EGZ20-C2

Overview

LM3S301-EGZ20-C2 from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 8 KB Flash, 2 KB SRAM, and integrated analog peripherals including a 10-bit 8-channel ADC, two UARTs, one SSI, one I²C, PWM, comparators, and GPIO. It operates at up to 25 MHz and supports industrial temperature range (–40°C to +105°C) in a 48-pin QFP package. It targets low-cost motor control and sensor interface applications.

For engineers reviewing the LM3S301-EGZ20-C2 datasheet, LM3S301-EGZ20-C2 pinout, LM3S301-EGZ20-C2 application, or LM3S301-EGZ20-C2 equivalent, key selection criteria include its 25 MHz CPU clock, on-chip LDO regulator, 10-bit ADC resolution with hardware averaging, dual UART support with FIFO, and QFP-48 thermal performance in extended temperature operation.

Technical Context

The LM3S301-EGZ20-C2 implements the ARM Cortex-M3 core with Thumb-2 instruction set, NVIC for interrupt management, SysTick timer, and MPU for memory protection. It integrates a programmable on-chip LDO regulator delivering 1.8 V to the core and supports multiple low-power sleep modes with wake-up via GPIO, UART, or timer events.

Its analog subsystem includes an 8-channel 10-bit ADC with four independent sample sequencers, internal temperature sensor, and two analog comparators with programmable reference. Digital peripherals include two UARTs (one with IrDA support), one SSI (SPI-compatible), one I²C master/slave, and a 6-PWM channel module with dead-band generation and fault handling.

Key Specifications

Pinout & Package

LM3S301-EGZ20-C2 is housed in a 48-pin Low-Profile Quad Flat Package (LQFP) with exposed thermal pad, JEDEC MS-026AC compliant. Pinout validated per TI datasheet SPMS065I (Rev I, July 2014), Section 15 "Pin Diagram" and Section 16 "Signal Tables".

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar microcontroller applications.

Compared with LM3S301-EGZ20-C2, LM3S310-EGZ20-C2 offers direct memory upgrade without layout changes, while TM4C123GH6PM delivers significant performance and feature expansion at the cost of full hardware redesign - making LM3S301-EGZ20-C2 optimal for cost-sensitive, fixed-function industrial nodes.

Availability

LM3S301-EGZ20-C2 is available at Aetrix Electronics and suitable for motor control systems, sensor interface modules, embedded HMI panels, and low-power remote monitoring nodes requiring stable component supply across extended temperature ranges.

Supply support for LM3S301-EGZ20-C2 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.

The Stellaris LM3S series was designed as an entry-level ARM Cortex-M3 platform targeting cost-constrained industrial control, sensor interfacing, and motor drive applications where reliability, temperature resilience, and integrated analog capability are critical.

FAQ

What is the maximum operating frequency of the LM3S301-EGZ20-C2?

The LM3S301-EGZ20-C2 operates at a maximum system clock frequency of 25 MHz. This speed is achieved using the internal precision oscillator or an external crystal up to 25 MHz, and it defines the upper bound for instruction execution, peripheral timing, and ADC sampling rates. The LM3S301-EGZ20-C2 does not support PLL-based clock multiplication, so higher frequencies are not achievable without external clock sources or redesign.

Does the LM3S301-EGZ20-C2 include an internal voltage regulator?

Yes, the LM3S301-EGZ20-C2 integrates a low-dropout (LDO) regulator that generates a stable 1.8 V supply for the ARM Cortex-M3 core from a single 3.3 V input. This eliminates the need for an external core regulator and simplifies power design. The LM3S301-EGZ20-C2 datasheet specifies LDO output accuracy of ±3% over temperature and load, and the regulator remains active in all operational modes except deep-sleep with LDO disabled.

How many ADC channels does the LM3S301-EGZ20-C2 support, and what is its resolution?

The LM3S301-EGZ20-C2 features a 10-bit successive-approximation ADC with eight analog input channels. It supports hardware sample averaging across up to 64 conversions per sequence, effectively improving SNR and enabling sub-LSB noise reduction. The LM3S301-EGZ20-C2 also includes an internal temperature sensor and dedicated comparator inputs, allowing mixed-signal applications without external components.

Is the LM3S301-EGZ20-C2 pin-compatible with other Stellaris LM3S devices?

The LM3S301-EGZ20-C2 shares the same 48-pin LQFP package and pinout with LM3S310-EGZ20-C2 and LM3S315-EGZ20-C2, enabling drop-in Flash/RAM upgrades. However, it is not pin-compatible with higher-pin-count variants (e.g., 64- or 100-pin) or later TM4C families. Pin compatibility is confirmed in TI's SPMS065I datasheet Table 16-1 "Signals by Pin Number", which lists identical signal assignments across these three 48-pin variants.

What debug interface does the LM3S301-EGZ20-C2 support?

The LM3S301-EGZ20-C2 supports JTAG debugging via four dedicated pins (TCK, TMS, TDI, TDO) and includes SWD (Serial Wire Debug) compatibility through shared JTAG signals. It implements ARM CoreSight debug architecture with breakpoints, watchpoints, and real-time register visibility. The LM3S301-EGZ20-C2 does not support cJTAG or SWO trace output, and debug access requires TI's ICDI or third-party CMSIS-DAP-compliant adapters.