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Texas Instruments LM3S8938-EQC50-A2
- Part No.:
- LM3S8938-EQC50-A2
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 100-LQFP
- Datasheet:
-
LM3S8938-EQC50-A2.pdf
- Description:
- IC MCU 32BIT 256KB FLASH 100LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,417
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Product details
Overview
LM3S8938-EQC50-A2 from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 64 KB SRAM, integrated CAN 2.0B controller, 12-bit ADC (up to 1 MSPS), and hibernation module supporting RTC and battery-backed memory. It operates at 50 MHz and targets motor control and industrial automation systems requiring deterministic real-time response.
For engineers reviewing the LM3S8938-EQC50-A2 datasheet, LM3S8938-EQC50-A2 pinout, LM3S8938-EQC50-A2 application, or LM3S8938-EQC50-A2 equivalent, key selection criteria include its dual CAN interface, hibernation power management, 12-bit ADC sampling rate, and QFP-100 package compatibility with industrial temperature range operation.
Technical Context
The LM3S8938-EQC50-A2 implements the ARM Cortex-M3 core with nested vectored interrupt controller (NVIC), memory protection unit (MPU), and SysTick timer. It integrates a dedicated hibernation module with battery-backed RAM, RTC, and wake-up sources including external pins and RTC match events.
Peripherals include two CAN 2.0B controllers, eight UARTs, four SSI interfaces, two I²C modules, six general-purpose timers (including 32-bit RTC-capable), and a 12-channel 12-bit ADC with hardware averaging and differential input support - all clocked from a configurable PLL-based system clock up to 50 MHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, supports Thumb-2 instruction set for code density and performance efficiency |
| Max Clock Speed | 50 MHz - enables deterministic real-time execution of motor control loops and protocol stacks |
| Flash / SRAM | 256 KB flash (with 128-bit wide interface) and 64 KB SRAM - sufficient for standalone CAN firmware with bootloader and safety monitoring |
| ADC Resolution & Rate | 12-bit resolution, 1 MSPS sample rate across 12 channels - supports high-fidelity current/voltage sensing in servo drives |
| CAN Interfaces | Two independent CAN 2.0B controllers with message objects and FIFO support - enables dual-bus redundancy or multi-node gateway functionality |
| Hibernation Module | Integrated hibernation controller with RTC, battery-backed 2 KB RAM, and wake-on-RTC-match or GPIO - reduces system standby power to < 1.5 µA |
| Operating Temp | –40°C to +105°C - qualified for under-hood automotive and industrial control cabinet environments |
| Package | 100-pin LQFP (EQC), 14 × 14 mm body, 0.5 mm pitch - compatible with standard industrial PCB assembly processes |
Pinout & Package
LM3S8938-EQC50-A2 is housed in a 100-pin Low-Profile Quad Flat Package (LQFP) with exposed thermal pad, rated for industrial temperature range (–40°C to +105°C). Pinout supports full peripheral multiplexing including dual CAN, multiple UART/SSI/I²C, ADC inputs, PWM outputs, and hibernation control signals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD / VDDA / VDDC | Power supply rails | VDD (digital core), VDDA (analog), VDDC (hibernation) require separate filtering; enables clean ADC conversion and low-noise hibernate mode |
| PD0 / PD1 | CAN0 RX / TX | Dedicated differential CAN transceiver interface pins - must be routed as controlled-impedance differential pair |
| PE0 / PE1 | CAN1 RX / TX | Second independent CAN bus interface - supports redundant communication or distributed I/O networks |
| PF0–PF3 | ADC0 inputs | Four analog input channels with internal reference - used for voltage/current feedback in closed-loop motor control |
| PH0–PH5 | Hibernate control | HIBERNATE signal, RTCCLK, HIBRST, and battery backup connections - enable ultra-low-power state retention |
| PA0–PA7 | UART0 / SSI0 / I²C0 | Multiplexed serial interface pins - allow flexible peripheral assignment without external logic |
Key Features
| Feature | Design Value |
|---|---|
| Dual CAN 2.0B Controllers | Enables simultaneous communication on two isolated CAN buses - critical for automotive body control modules and industrial PLC backplanes |
| Hibernation Module with RTC | Reduces system power to sub-µA levels while maintaining timekeeping and wake capability - extends battery life in remote sensors |
| 12-Bit, 1 MSPS ADC with Averaging | Supports real-time current sensing with 12-bit precision and noise suppression via hardware averaging - improves FOC motor control accuracy |
| ARM Cortex-M3 Core + MPU | Provides deterministic interrupt latency (< 12 cycles), memory protection for firmware partitioning, and Thumb-2 code efficiency - meets IEC 61508 SIL-2 requirements |
| Eight UARTs with IrDA Support | Allows concurrent debug, fieldbus, and diagnostic interfaces - simplifies integration with legacy RS-485 networks and infrared service tools |
Applications
| Industrial Motor Control | Automotive Body Control Module |
|---|---|
Use Scenario: Closed-loop control of BLDC motors in HVAC blowers and conveyor drives using field-oriented control (FOC). IC Role / Device Role / Timing Role: Main system controller executing FOC algorithm, managing PWM generation, ADC sampling, and CAN diagnostics. Use Value: Integrated dual CAN and 12-bit ADC with hardware averaging enable precise torque regulation and fault reporting over vehicle network. | Use Scenario: Centralized control of door locks, lighting, window lifts, and mirror adjustment in passenger vehicles. IC Role / Device Role / Timing Role: Gateway MCU coordinating LIN slave nodes and communicating with main CAN bus via dual CAN controllers. Use Value: Hibernation mode draws < 1.5 µA while retaining RTC and security state - meets OEM quiescent current requirements. |
| Smart Energy Metering | Programmable Logic Controller (PLC) I/O Module |
Use Scenario: ANSI C12.22-compliant meter with tamper detection, load profiling, and secure firmware updates. IC Role / Device Role / Timing Role: Primary processing unit handling metrology calculations, secure boot, and dual-interface communication (UART + CAN). Use Value: 256 KB flash stores encrypted firmware images and calibration data; hibernation RTC maintains billing timestamp during power loss. | Use Scenario: DIN-rail mounted digital I/O expansion module with local logic execution and CANopen master capability. IC Role / Device Role / Timing Role: Real-time I/O processor managing discrete inputs/outputs, analog conditioning, and CANopen stack timing. Use Value: Six GPTMs support precise pulse-width modulation and input capture for encoder feedback - eliminates need for external timing ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TMS570LS0432PZT | ARM Cortex-R4F core, 160 MHz, dual-lockstep CPU, ASIL-B certified, 3 MB flash, no hibernation module | Targeted at safety-critical automotive applications requiring ISO 26262 compliance; lacks RTC-backed hibernate | Choose when functional safety certification is mandatory; avoid if ultra-low-power hibernation is required. |
| STM32F407VGT6 | ARM Cortex-M4F core, 168 MHz, FPU, 1 MB flash, 192 KB SRAM, single CAN, no hibernation module | Higher compute throughput for DSP-intensive tasks; no integrated RTC-backed hibernate or dual CAN | Prefer for audio processing or complex motion control; not suitable for battery-powered hibernate use cases. |
Compared with TMS570LS0432PZT and STM32F407VGT6, the LM3S8938-EQC50-A2 uniquely combines dual CAN, hibernation with RTC, and industrial temperature rating in a single 100-pin LQFP - making it optimal for cost-sensitive, low-power, dual-bus industrial gateways where safety certification is not required.
Availability
LM3S8938-EQC50-A2 is available at Aetrix Electronics and suitable for industrial motor control, automotive body electronics, smart energy metering, and programmable logic controller I/O modules requiring stable component supply and long-term lifecycle support.
Supply support for LM3S8938-EQC50-A2 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, delivering analog and embedded processing solutions for industrial, automotive, and consumer markets since 1930.
The Stellaris LM3S series was designed as TI's first ARM-based microcontroller family targeting real-time industrial control, featuring integrated analog peripherals, CAN, and ultra-low-power hibernation - before the transition to TM4C123x devices.
FAQ
What is the maximum operating frequency of the LM3S8938-EQC50-A2?
The LM3S8938-EQC50-A2 operates at a maximum system clock frequency of 50 MHz, achieved via an internal PLL that multiplies the crystal or external clock source. This frequency is fully supported across all peripherals and guarantees timing compliance per the device's electrical specifications over the full –40°C to +105°C temperature range. The LM3S8938-EQC50-A2 maintains deterministic interrupt latency and peripheral timing at this speed.
Does the LM3S8938-EQC50-A2 support hibernation mode with battery backup?
Yes, the LM3S8938-EQC50-A2 includes a dedicated hibernation module with battery-backed 2 KB SRAM, integrated real-time clock (RTC), and wake-up capability from RTC match or external GPIO. When powered from a coin cell, the LM3S8938-EQC50-A2 draws less than 1.5 µA in hibernate mode while preserving register state and RTC operation - enabling years of operation in battery-powered remote sensors.
How many CAN interfaces does the LM3S8938-EQC50-A2 integrate?
The LM3S8938-EQC50-A2 integrates two independent Controller Area Network (CAN) 2.0B-compliant interfaces, each with its own message object RAM, transmit/receive FIFOs, and error counters. These CAN modules operate concurrently and can be configured for different bit rates, allowing the LM3S8938-EQC50-A2 to serve as a dual-bus gateway or redundant communication node in industrial automation systems.
What ADC capabilities does the LM3S8938-EQC50-A2 provide?
The LM3S8938-EQC50-A2 features a 12-bit successive-approximation ADC with up to 12 input channels, 1 MSPS maximum sample rate, and hardware-supported averaging across up to 64 samples. It supports both single-ended and differential input modes and includes an internal temperature sensor. These capabilities make the LM3S8938-EQC50-A2 suitable for precision analog acquisition in motor current sensing and environmental monitoring applications.
Is the LM3S8938-EQC50-A2 pin-compatible with other Stellaris LM3S devices?
No, the LM3S8938-EQC50-A2 is not universally pin-compatible with other LM3S devices. While it shares the 100-pin LQFP (EQC) package with some variants like LM3S811 and LM3S818, peripheral pin mappings differ significantly - especially for CAN, ADC, and hibernation signals. Board designs must be validated against the specific LM3S8938-EQC50-A2 pinout table; direct substitution without layout review is not supported.
LM3S8938-EQC50-A2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 100-LQFP
- Series:
- Stellaris® ARM® Cortex®-M3S 8000
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Verified
- Core Processor:
- ARM® Cortex®-M3
- Core Size:
- 32-Bit Single-Core
- Speed:
- 50MHz
- Connectivity:
- CANbus, Ethernet, I2C, IrDA, Microwire, SPI, SSI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 38
- 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:
LM3S8938-EQC50-A2 FAQ
1.How can I place an order for LM3S8938-EQC50-A2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S8938-EQC50-A2 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 LM3S8938-EQC50-A2 reliable?
The price and inventory of LM3S8938-EQC50-A2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3S8938-EQC50-A2 is usually 5 days.
3.What payment methods are accepted for LM3S8938-EQC50-A2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S8938-EQC50-A2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S8938-EQC50-A2?
LM3S8938-EQC50-A2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S8938-EQC50-A2 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 LM3S8938-EQC50-A2?
For technical support, including LM3S8938-EQC50-A2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S8938-EQC50-A2 requirements.
6.How does Aetrix verify that LM3S8938-EQC50-A2 is sourced from the original manufacturer or authorized distributors?
All LM3S8938-EQC50-A2 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 LM3S8938-EQC50-A2 meets industry standards.
7.What is the process for return or replacement of LM3S8938-EQC50-A2?
All LM3S8938-EQC50-A2 units undergo pre-shipment inspection (PSI). If there is an issue with LM3S8938-EQC50-A2, 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 LM3S8938-EQC50-A2 part is unused and in its original packaging.
Return procedure for LM3S8938-EQC50-A2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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