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Texas Instruments LM3S1911-IBZ50-A2
- Part No.:
- LM3S1911-IBZ50-A2
- Manufacturer:
- Texas Instruments
- Category:
- Microcontrollers
- Package:
- 108-LFBGA
- Datasheet:
-
LM3S1911-IBZ50-A2.pdf
- Description:
- IC MCU 32BIT 256KB FLASH 108BGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,341
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Product details
Overview
LM3S1911-IBZ50-A2 from Texas Instruments is a 32-bit ARM Cortex-M3 microcontroller with 256 KB flash, 32 KB SRAM, and integrated peripherals including UART, I²C, SSI, PWM timers, analog comparators, and hibernation module. It operates at up to 50 MHz, supports 3.3 V supply, and targets low-power embedded control in industrial monitoring and motor drive systems.
For engineers reviewing the LM3S1911-IBZ50-A2 datasheet, LM3S1911-IBZ50-A2 pinout, LM3S1911-IBZ50-A2 application, or LM3S1911-IBZ50-A2 equivalent, key selection criteria include its 100-pin LQFP package, hibernation-capable real-time clock, 8-channel PWM, dual UARTs with IrDA support, and Cortex-M3 interrupt latency under 12 cycles.
Technical Context
The LM3S1911-IBZ50-A2 implements the ARMv7-M architecture with NVIC supporting 48 configurable interrupts, SysTick timer, and MPU for memory protection. Its system-level interface includes JTAG debugging, SWD compatibility, and trace port interface unit (TPIU) for real-time instruction tracing.
Peripherals are memory-mapped and clock-gated via the system control block. The hibernation module provides battery-backed RTC, 2 KB hibernate RAM, and wake-up on external event or time match - all functional while main power is off.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M3, 32-bit RISC, 50 MHz max operation - enables deterministic real-time response with Thumb-2 instruction set. |
| Memory | 256 KB on-chip flash + 32 KB SRAM - sufficient for standalone firmware with bootloader and field-upgrade capability. |
| Package | 100-pin LQFP (14 × 14 mm, 0.5 mm pitch) - compatible with standard reflow assembly and accessible debug/test routing. |
| Power Modes | Run, Sleep, Deep-Sleep, Hibernate - hibernate draws ≤1.8 µA with RTC active, enabling multi-year battery life. |
| Timers | 6 × 16-bit GPTMs (configurable as 3 × 32-bit), 1 × watchdog - supports motor commutation timing, input capture, and periodic system supervision. |
| Serial Interfaces | 2 × UART (with IrDA/SIR), 2 × SSI, 1 × I²C - enables sensor fusion, display control, and multi-drop industrial bus communication. |
| Analog | 2 × analog comparators with internal reference - allows overvoltage detection, zero-crossing sensing, and threshold-triggered wake-up without ADC overhead. |
Pinout & Package
LM3S1911-IBZ50-A2 is housed in a 100-pin LQFP package (Pb-free, RoHS-compliant) with exposed thermal pad. Pin functions are fully defined per TI SPMS032I datasheet Section 15 (Pin Diagram) and Section 16.1 (100-Pin LQFP Signal Tables).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDC | Supply rails | Digital core (VDDC), analog (VDDA), and I/O (VDD) each require independent 3.3 V filtering - decoupling critical for ADC stability and EMI compliance. |
| GPIOA–G[0:7] | Configurable I/O bank | Each pin supports alternate functions (UART0TX, SSI0CLK, etc.) and programmable pull-up/down - enables flexible peripheral mapping without board redesign. |
| HIB, RTCCLK, HIBRCC | Hibernation control | HIB pin enables hardware-controlled entry/exit from hibernate; RTCCLK accepts external 32.768 kHz crystal; HIBRCC is internal hibernate RC oscillator - eliminates need for external RTC IC. |
| JTAG/SWD | Debug interface | TCK/TMS/TDI/TDO/nTRST support full boundary-scan and SWD - permits in-circuit programming and real-time trace during development and field updates. |
Key Features
| Feature | Design Value |
|---|---|
| Hibernate module with RTC & 2 KB RAM | Maintains timekeeping and critical state across main power loss using coin-cell backup - reduces BOM cost vs discrete RTC + SRAM. |
| ARM Cortex-M3 with NVIC & MPU | Hardware-based interrupt prioritization (8 priority levels) and memory protection prevent runaway code from corrupting critical data sections. |
| Dual UART with IrDA physical layer | Enables direct infrared communication (e.g., remote configuration) without external transceiver - simplifies optical interface design. |
| 8-channel PWM with dead-band generation | Supports three-phase motor control with complementary outputs and programmable delay - eliminates need for external gate driver logic. |
| Programmable internal voltage reference | 2.5 V reference for analog comparators - enables accurate threshold detection independent of supply variation or external components. |
Applications
| Industrial Sensor Node | Smart HVAC Controller |
|---|---|
Use Scenario: Battery-powered temperature/humidity node transmitting data hourly via UART-to-LoRa gateway. IC Role / Device Role / Timing Role: Main system controller managing sensor reads, hibernate scheduling, and UART packet framing. Use Value: Hibernate current ≤1.8 µA extends 2× AA battery life beyond 5 years; internal RTC ensures precise wakeup intervals without external timing components. | Use Scenario: Wall-mounted thermostat with fan speed control, ambient sensing, and IR remote interface. IC Role / Device Role / Timing Role: Real-time HVAC logic engine coordinating PWM fan drive, comparator-based overheat detection, and IrDA command decoding. Use Value: Integrated 8-channel PWM and dual UART with IrDA PHY eliminate 3 external ICs; hibernate mode maintains clock and settings during AC power loss. |
| Motor Drive Interface Board | Programmable Logic Relay |
Use Scenario: Compact BLDC driver board accepting CAN commands and generating 3-phase gate signals. IC Role / Device Role / Timing Role: Motion control co-processor handling commutation timing, current fault detection, and serial command parsing. Use Value: Six 16-bit GPTMs configured as 32-bit timers provide sub-microsecond phase alignment; analog comparators enable <100 ns overcurrent trip response. | Use Scenario: DIN-rail mounted relay module with configurable I/O mapping, web-based setup, and event logging. IC Role / Device Role / Timing Role: Embedded Linux companion MCU managing GPIO state, EEPROM logging, and UART-to-Ethernet bridge protocol translation. Use Value: 256 KB flash stores dual firmware images for safe OTA updates; 32 KB SRAM accommodates TCP/IP stack and local web server. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3S1968-IBZ50-A2 | Same core and package, but adds 10-bit 8-channel ADC and USB device interface. | Required where analog signal acquisition or host-connected firmware update is needed. | Select LM3S1968 if ADC or USB functionality is mandatory; LM3S1911-IBZ50-A2 offers lower cost and reduced power when those features are unused. |
| TM4C123GH6PM | Successor family with 80 MHz CPU, enhanced peripherals, and updated toolchain support; not pin-compatible. | Suitable for new designs requiring higher performance or extended lifecycle; requires PCB redesign. | Choose TM4C123GH6PM for long-term availability and feature expansion; retain LM3S1911-IBZ50-A2 for legacy compatibility and minimal BOM change. |
Compared with LM3S1968-IBZ50-A2, LM3S1911-IBZ50-A2 saves cost and power by omitting ADC/USB, while retaining identical hibernate, PWM, and serial capabilities. Against TM4C123GH6PM, it trades performance and roadmap support for proven stability and drop-in replacement in existing LQFP-100 layouts.
Availability
LM3S1911-IBZ50-A2 is available at Aetrix Electronics and suitable for industrial sensor nodes, smart HVAC controllers, motor drive interface boards, and programmable logic relays requiring stable component supply and long-term obsolescence management.
Supply support for LM3S1911-IBZ50-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, specializing in analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.
The Stellaris LM3S series was designed as the first ARM Cortex-M3-based microcontroller family for cost-sensitive, low-power industrial control applications - emphasizing integration, debug readiness, and hibernate efficiency.
FAQ
What is the maximum operating frequency of the LM3S1911-IBZ50-A2?
The LM3S1911-IBZ50-A2 operates at a maximum system clock frequency of 50 MHz, derived from an internal PLL that multiplies the input crystal or oscillator frequency. This rating is specified under recommended operating conditions (3.0 V to 3.6 V supply, –40°C to +85°C ambient), and the device maintains full peripheral functionality at this speed. All timing parameters in the SPMS032I datasheet assume this 50 MHz operation.
Does the LM3S1911-IBZ50-A2 include an analog-to-digital converter (ADC)?
No, the LM3S1911-IBZ50-A2 does not integrate an ADC. It includes two analog comparators with programmable internal reference but no sampling ADC subsystem. For designs requiring analog measurement, TI recommends the pin-compatible LM3S1968-IBZ50-A2 variant, which adds a 10-bit 8-channel ADC while retaining identical package, clocking, and hibernate architecture.
What debug interfaces does the LM3S1911-IBZ50-A2 support?
The LM3S1911-IBZ50-A2 supports JTAG and Serial Wire Debug (SWD) interfaces via dedicated pins (TCK, TMS, TDI, TDO, nTRST). It also includes a Trace Port Interface Unit (TPIU) for real-time instruction trace output. These interfaces are fully supported by TI's Code Composer Studio and third-party tools like Keil MDK and IAR Embedded Workbench for firmware development and runtime analysis.
Can the LM3S1911-IBZ50-A2 operate from a single 3.3 V supply?
Yes, the LM3S1911-IBZ50-A2 is designed to operate from a single 3.3 V nominal supply across all rails: VDD (I/O), VDDC (core), and VDDA (analog). Internal regulators generate required core voltages, and the datasheet specifies operation from 3.0 V to 3.6 V. Decoupling capacitors must be placed per Section 18.1.3 of SPMS032I to ensure stable operation under dynamic load.
Is the LM3S1911-IBZ50-A2 still in production and supported by Texas Instruments?
The LM3S1911-IBZ50-A2 is a mature product in TI's discontinued Stellaris portfolio, with last-time-buy (LTB) status declared in 2016. However, Aetrix Electronics maintains active inventory and provides full technical documentation, legacy toolchain support, and lifecycle continuity services for ongoing production programs that rely on this part.
LM3S1911-IBZ50-A2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 108-LFBGA
- Series:
- Stellaris® ARM® Cortex®-M3S 1000
- Packaging:
- Tray
- Product Status:
- Not For New Designs
- 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:
- 60
- 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:
- -
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
LM3S1911-IBZ50-A2 FAQ
1.How can I place an order for LM3S1911-IBZ50-A2 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3S1911-IBZ50-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 LM3S1911-IBZ50-A2 reliable?
The price and inventory of LM3S1911-IBZ50-A2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3S1911-IBZ50-A2 is usually 5 days.
3.What payment methods are accepted for LM3S1911-IBZ50-A2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3S1911-IBZ50-A2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3S1911-IBZ50-A2?
LM3S1911-IBZ50-A2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3S1911-IBZ50-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 LM3S1911-IBZ50-A2?
For technical support, including LM3S1911-IBZ50-A2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3S1911-IBZ50-A2 requirements.
6.How does Aetrix verify that LM3S1911-IBZ50-A2 is sourced from the original manufacturer or authorized distributors?
All LM3S1911-IBZ50-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 LM3S1911-IBZ50-A2 meets industry standards.
7.What is the process for return or replacement of LM3S1911-IBZ50-A2?
All LM3S1911-IBZ50-A2 units undergo pre-shipment inspection (PSI). If there is an issue with LM3S1911-IBZ50-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 LM3S1911-IBZ50-A2 part is unused and in its original packaging.
Return procedure for LM3S1911-IBZ50-A2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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