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Texas Instruments LM3S1958-EQC50-A2T
- Part No.:
- LM3S1958-EQC50-A2T
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
LM3S1958-EQC50-A2T.pdf
- Description:
- IC MCU 32BIT 256KB FLASH 100LQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM3S1958-EQC50-A2T from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 64 KB SRAM, integrated hibernation module, 12-bit ADC (8-channel), and dual UARTs + I²C + SSI interfaces. It operates at 50 MHz and supports industrial motor control and sensor-based embedded systems requiring low-power hibernation and real-time analog acquisition.
For engineers reviewing the LM3S1958-EQC50-A2T datasheet, LM3S1958-EQC50-A2T pinout, LM3S1958-EQC50-A2T application, or LM3S1958-EQC50-A2T equivalent, key selection criteria include hibernation current (2 µA), RTC-backed battery operation, 100-pin LQFP package compatibility, and StellarisWare® software support for rapid firmware development.
Technical Context
The LM3S1958-EQC50-A2T integrates an ARM Cortex-M3 core with NVIC, SysTick, and MPU for deterministic real-time execution. It features a dedicated hibernation module with battery-backed RTC and 2 KB RAM, enabling sub-2 µA deep-sleep operation while retaining timekeeping and critical state.
Analog subsystem includes an 8-channel, 12-bit, 1 MSPS ADC with hardware averaging and temperature sensor; communication peripherals comprise two UARTs (one with IrDA/SIR), one I²C master/slave, and one SSI controller supporting SPI/Microwire modes - all independently clocked and interrupt-capable.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, runs at up to 50 MHz - enables deterministic real-time task scheduling and interrupt latency under 12 cycles. |
| Flash Memory | 256 KB on-chip flash with 128-bit wide interface - supports in-application programming and secure code storage with erase/program cycle endurance >10k. |
| SRAM | 64 KB general-purpose SRAM - sufficient for RTOS stacks, buffers, and firmware variables without external memory. |
| Hibernate Current | 2 µA typical with RTC active and 2 KB RAM retained - enables multi-year battery life in remote sensor nodes. |
| ADC | 12-bit, 8-channel, 1 MSPS sampling rate with hardware averaging - delivers high-resolution analog sensing for motor current or temperature monitoring. |
| Package | 100-pin LQFP (14 × 14 mm, 0.5 mm pitch) - compatible with standard reflow processes and accessible for manual prototyping and debug. |
| Operating Temp | –40°C to +105°C - qualified for industrial environments including motor drives and factory automation equipment. |
Pinout & Package
LM3S1958-EQC50-A2T is housed in a 100-pin LQFP package (JEDEC MO-152AC) with exposed thermal pad. Pin assignments follow TI's standardized Stellaris GPIO mapping, supporting multiplexed peripheral functions per pin group.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDC | Power supply inputs | Digital (VDD), analog (VDDA), and core (VDDC) rails require separate 3.3 V filtering - enables noise isolation between logic and ADC sections. |
| GND, GNDA, GNDC | Ground returns | Analog ground (GNDA) must be star-connected to minimize ADC reference noise; digital ground (GND) handles switching currents. |
| PD0–PD7, PE0–PE5, etc. | GPIO bank terminals | Configurable as digital I/O, UART/I²C/SSI signals, or ADC inputs - allows flexible board routing and peripheral sharing without external logic. |
| HIB, RTCCLK, HIBRST | Hibernation control pins | Enable hardware-initiated sleep/wake via external wake-up sources or RTC alarm - eliminates need for external supervisor ICs. |
| U0RX/U0TX, U1RX/U1TX | UART transceiver I/O | Dual independent UARTs support simultaneous host debugging (U0) and fieldbus communication (U1) - no resource contention during firmware updates. |
Key Features
| Feature | Design Value |
|---|---|
| Hibernation Module with RTC | Retains 2 KB SRAM and keeps RTC running on battery backup at 2 µA - enables time-stamped wake-up without external real-time clock IC. |
| Integrated 12-bit ADC | 8-channel, 1 MSPS sampling with hardware averaging and internal temperature sensor - reduces BOM count by eliminating external signal conditioning for thermal monitoring. |
| Dual UART with IrDA/SIR | Second UART supports infrared data transmission (SIR protocol) - enables contactless configuration in sealed industrial enclosures. |
| StellarisWare® Peripheral Driver Library | TI-provided C APIs abstract register-level access for UART, ADC, GPIO, and timers - cuts firmware bring-up time by >40% versus bare-metal development. |
| MPU and NVIC | Memory Protection Unit enforces privilege separation; Nested Vectored Interrupt Controller supports 64 interrupts with configurable priority - ensures robustness in safety-critical motor control loops. |
Applications
| Industrial Motor Control | Smart Sensor Node |
|---|---|
Use Scenario: Closed-loop control of BLDC motors in HVAC blowers with thermal derating and fault logging. IC Role / Device Role / Timing Role: Main system controller executing FOC algorithms, reading current/voltage/temperature sensors, and driving gate drivers via PWM outputs. Use Value: On-chip 12-bit ADC and hibernation-ready RTC allow precise current sensing and scheduled maintenance alerts without external components. | Use Scenario: Battery-powered environmental monitor measuring temperature, humidity, and air quality in remote facilities. IC Role / Device Role / Timing Role: Data acquisition hub that samples sensors, timestamps readings, stores locally, and transmits over UART to gateway. Use Value: 2 µA hibernate current extends 2xAA battery life to >3 years; integrated temperature sensor calibrates other analog readings. |
| Factory Automation I/O Module | Programmable Logic Controller (PLC) Edge Device |
Use Scenario: DIN-rail mounted digital I/O expansion unit with isolated inputs and relay outputs for legacy machine interfaces. IC Role / Device Role / Timing Role: Protocol translator and timing coordinator handling Modbus RTU over UART and local GPIO event capture. Use Value: Dual UARTs enable simultaneous Modbus slave communication and debug port access; GPIO interrupt capability detects fast edge transitions on input lines. | Use Scenario: Compact PLC sub-module performing ladder logic execution and discrete I/O scanning in space-constrained cabinets. IC Role / Device Role / Timing Role: Deterministic real-time executor with 50 MHz Cortex-M3 core, managing scan cycles, watchdog supervision, and nonvolatile parameter storage. Use Value: 256 KB flash stores multiple firmware versions and configuration sets; MPU prevents runtime corruption during field updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3S1968-IQC50-A2T | Same core and peripherals but rated for –40°C to +85°C industrial temp range; lacks hibernation module and battery-backed RTC. | Suitable for cost-sensitive non-battery applications where deep-sleep is unnecessary. | Select when ambient temperature stays below 85°C and ultra-low-power hibernation is not required. |
| TM4C123GH6PM | Successor device with same pinout, 80 MHz CPU, 256 KB flash, 32 KB SRAM, enhanced ADC (12-bit, 1 MSPS, 16 channels), and USB OTG. | Supports USB-based firmware updates and higher-speed control loops; requires minor PCB layout revision for USB routing. | Choose for new designs needing USB connectivity or higher performance; not drop-in due to USB pin additions. |
Compared with LM3S1958-EQC50-A2T, LM3S1968-IQC50-A2T trades hibernation capability for lower cost and wider availability, while TM4C123GH6PM offers USB and higher clock speed but requires design adaptation - making LM3S1958-EQC50-A2T optimal for legacy-compatible, battery-aware industrial controllers.
Availability
LM3S1958-EQC50-A2T is available at Aetrix Electronics and suitable for industrial motor control, smart sensor nodes, factory automation I/O modules, and PLC edge devices requiring stable component supply across extended product lifecycles.
Supply support for LM3S1958-EQC50-A2T 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 leader specializing in analog, embedded processing, and wireless technologies, with decades of experience in industrial and automotive-grade microcontrollers.
The Stellaris LM3S series was designed specifically for cost-sensitive, real-time industrial applications demanding low-power hibernation, integrated analog peripherals, and deterministic ARM Cortex-M3 execution - targeting motor control, sensor hubs, and programmable logic edge devices.
FAQ
What is the maximum operating frequency of the LM3S1958-EQC50-A2T?
The LM3S1958-EQC50-A2T operates at a maximum CPU frequency of 50 MHz, as specified in its production data sheet. This clock speed is achieved using the internal PLL with a 1–25 MHz crystal or external clock source. The 50 MHz rating applies across the full industrial temperature range (–40°C to +105°C) and is validated for sustained operation under worst-case voltage and thermal conditions. LM3S1958-EQC50-A2T maintains consistent timing margins for all on-chip peripherals at this frequency.
Does the LM3S1958-EQC50-A2T support in-system programming (ISP)?
Yes, the LM3S1958-EQC50-A2T supports in-system programming via its built-in UART bootloader, accessible through the primary UART (U0) using TI's Flash Programming Utility. No external programmer is required for initial firmware loading or field updates. The 256 KB flash memory is organized into 2 KB sectors, allowing selective erase and reprogramming without affecting active application code. LM3S1958-EQC50-A2T also supports SWD/JTAG for full debug and programming access.
What power modes does the LM3S1958-EQC50-A2T support, and what is the lowest current draw?
The LM3S1958-EQC50-A2T supports Sleep, Deep-Sleep, and Hibernate power modes. In Hibernate mode with RTC and 2 KB RAM retained, it draws 2 µA typical at 3.3 V and 25°C - verified in production testing. This mode uses the hibernation module's dedicated power domain and battery backup path. LM3S1958-EQC50-A2T exits Hibernate in <10 µs upon RTC match or external wake-up, preserving deterministic real-time response.
Is the LM3S1958-EQC50-A2T pin-compatible with other Stellaris LM3S devices?
LM3S1958-EQC50-A2T is pin-compatible with other 100-pin LQFP Stellaris devices in the LM3S19xx family, including LM3S1968 and LM3S1918, sharing identical mechanical footprint and core peripheral pin mappings. However, differences exist in hibernation-related pins (HIB, RTCCLK) and ADC channel availability. LM3S1958-EQC50-A2T retains full functional compatibility for GPIO, UART, I²C, and SSI signals - enabling direct substitution where hibernation is not used.
What development tools are officially supported for the LM3S1958-EQC50-A2T?
Texas Instruments officially supports Keil MDK-ARM, IAR Embedded Workbench, and GCC-based toolchains (including TI's Code Generation Tools) for LM3S1958-EQC50-A2T firmware development. StellarisWare® peripheral driver library and evaluation boards like EK-LM3S8962 provide tested reference code. LM3S1958-EQC50-A2T is fully compatible with TI's Stellaris ICDI debug interface and JTAG/SWD emulators such as XDS100v3.
LM3S1958-EQC50-A2T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 100-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 1000
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M3
- Core Size:
- 32-Bit Single-Core
- Speed:
- 50MHz
- Connectivity:
- I2C, IrDA, Microwire, SPI, SSI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 52
- Program Memory Size:
- 256KB (256K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- -
- RAM Size:
- 64K x 8
- Voltage - Supply (Vcc/Vdd):
- 2.25V ~ 2.75V
- Data Converters:
- A/D 8x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
LM3S1958-EQC50-A2T FAQ
1.How can I place an order for LM3S1958-EQC50-A2T through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S1958-EQC50-A2T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM3S1958-EQC50-A2T reliable?
The price and inventory of LM3S1958-EQC50-A2T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3S1958-EQC50-A2T is usually 5 days.
3.What payment methods are accepted for LM3S1958-EQC50-A2T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S1958-EQC50-A2T transactions.
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4.How is shipping managed for LM3S1958-EQC50-A2T?
LM3S1958-EQC50-A2T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S1958-EQC50-A2T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM3S1958-EQC50-A2T?
For technical support, including LM3S1958-EQC50-A2T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S1958-EQC50-A2T requirements.
6.How does Aetrix verify that LM3S1958-EQC50-A2T is sourced from the original manufacturer or authorized distributors?
All LM3S1958-EQC50-A2T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM3S1958-EQC50-A2T meets industry standards.
7.What is the process for return or replacement of LM3S1958-EQC50-A2T?
All LM3S1958-EQC50-A2T units undergo pre-shipment inspection (PSI). If there is an issue with LM3S1958-EQC50-A2T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM3S1958-EQC50-A2T part is unused and in its original packaging.
Return procedure for LM3S1958-EQC50-A2T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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