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STMicroelectronics STM32L051C8T7TR
- Part No.:
- STM32L051C8T7TR
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
STM32L051C8T7TR.pdf
- Description:
- IC MCU 32BIT 64KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,391
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Product details
Overview
STM32L051C8T7TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller with 64 KB Flash, 8 KB SRAM, 2 KB EEPROM (with ECC), 12-bit ADC (1.14 Msps), and operating voltage range of 1.65–3.6 V. It delivers 0.95 DMIPS/MHz performance at up to 32 MHz and supports -40 to +125 °C industrial temperature operation. Used in battery-powered sensor nodes requiring long runtime and robust analog sensing.
For engineers reviewing the STM32L051C8T7TR datasheet, STM32L051C8T7TR pinout, STM32L051C8T7TR application, or STM32L051C8T7TR equivalent, key selection criteria include standby current (0.27 µA), RTC + RAM retention in Stop mode (0.8 µA), 45 5V-tolerant I/Os, ultra-low-power comparators with wake-up capability, and integrated 32 kHz RTC oscillator with calibration.
Technical Context
The STM32L051C8T7TR implements a single-core Arm Cortex-M0+ with Memory Protection Unit (MPU), supporting dynamic voltage scaling across three power ranges. Its clock system integrates multiple internal oscillators (HSI16, LSI, MSI) plus external crystal support (1–25 MHz HSE and 32 kHz LSE), enabling precise low-power timing and fast wake-up from Stop/Standby modes.
Analog subsystem includes a 12-bit ADC with up to 16 channels, two ultra-low-power comparators (operable down to 1.65 V), and internal voltage reference (VREFINT). Power management features BOR with five thresholds, programmable voltage detector (PVD), and dedicated low-power regulators for sub-µA sleep states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M0+, 32-bit, with MPU - enables deterministic real-time execution and memory isolation for firmware safety. |
| Max Clock Frequency | 32 MHz - supports high-speed peripheral operation while maintaining sub-1 µA Stop mode current. |
| Flash / SRAM / EEPROM | 64 KB Flash (ECC), 8 KB SRAM, 2 KB EEPROM (ECC) - ensures data integrity in harsh environments and enables field firmware updates with rollback. |
| ADC Resolution & Speed | 12-bit, 1.14 Msps - provides sufficient resolution and sampling rate for precision sensor signal acquisition (e.g., temperature, pressure). |
| Low-Power Modes | 0.27 µA Standby (2 wakeup pins), 0.8 µA Stop + RTC + 8 KB RAM retention - enables multi-year battery life in intermittent-sensing applications. |
| I/O Count & Tolerance | Up to 51 fast I/Os, 45 5V-tolerant - simplifies interface to legacy 5V peripherals without level shifters. |
| Operating Voltage | 1.65 V to 3.6 V - supports direct Li-ion/Li-SOCl₂ battery operation without external regulation. |
Pinout & Package
STM32L051C8T7TR is housed in a 32-pin LQFP package (7 × 7 mm, 0.8 mm pitch), RoHS-compliant and ECOPACK2 certified. Pin layout supports compact PCB design with full GPIO remapping and flexible alternate function routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual VDD/VSS pairs ensure stable core and I/O domain operation; decoupling required per datasheet layout guidelines. |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; accepts external push-button or supervisor IC assertion. |
| BOOT0 | Boot mode selection | High at reset enables system memory bootloader; used for factory programming or recovery via USART/SPI. |
| PA0–PA15, PB0–PB11 | General-purpose I/Os | 45 pins are 5V-tolerant; all support interrupt, event generation, and remappable alternate functions (USART, SPI, I²C, timers). |
| OSC_IN / OSC_OUT | HSE crystal oscillator interface | Supports 1–25 MHz external crystal; enables precise timing for USB, communication, or RTC calibration. |
| LSE_IN / LSE_OUT | 32 kHz RTC crystal interface | Drives low-power real-time clock with ±20 ppm accuracy; supports automatic calibration against HSE. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power Stop mode with RTC + 8 KB RAM retention | 0.8 µA - preserves full context and timekeeping during extended sleep, minimizing wake-up latency and energy overhead. |
| ECC-protected Flash and EEPROM | Single-bit error correction, double-bit error detection - prevents silent data corruption in mission-critical firmware and configuration storage. |
| Two ultra-low-power comparators | Operate down to 1.65 V with window mode and wake-up capability - enables autonomous analog threshold monitoring without CPU intervention. |
| Pre-programmed system memory bootloader | Supports USART and SPI interfaces - allows field firmware updates without debug hardware or external programmer. |
| Serial wire debug (SW-DP) | 2-pin debug interface - reduces PCB footprint vs JTAG while supporting full flash programming and real-time trace. |
Applications
| Smart Utility Metering | Wireless Sensor Node |
|---|---|
Use Scenario: Battery-powered gas/water meter with pulse counting, temperature compensation, and LoRaWAN transmission every 15 minutes. IC Role / Device Role / Timing Role: Main controller managing sensor acquisition, RTC-based scheduling, low-power radio interface, and secure data logging to EEPROM. Use Value: 0.27 µA Standby current extends 10-year battery life; 2 KB EEPROM stores calibration and usage history with ECC protection. |
Use Scenario: Indoor environmental monitor (temp/humidity/CO₂) powered by coin cell, transmitting via BLE only on threshold breach. IC Role / Device Role / Timing Role: System-on-chip handling analog sensor reads, comparator-triggered wake-up, BLE stack offload, and adaptive sleep scheduling. Use Value: Dual ultra-low-power comparators enable immediate wake on sensor alert; 3.5 µs RAM wake-up latency ensures responsive event capture. |
| Industrial Predictive Maintenance | Medical Wearable Patch |
Use Scenario: Vibration sensor node on motor housing, performing FFT analysis on collected accelerometer data and transmitting anomalies weekly. IC Role / Device Role / Timing Role: Real-time data acquisition controller with DMA-driven ADC, timer-triggered processing windows, and secure OTA update support. Use Value: 7-channel DMA offloads CPU during sensor streaming; 64 KB Flash accommodates dual-bank firmware for safe over-the-air updates. |
Use Scenario: Disposable ECG patch with 7-day wear life, measuring heart rate variability and detecting arrhythmia events. IC Role / Device Role / Timing Role: Low-noise analog front-end manager with 12-bit ADC oversampling, real-time QRS detection, and encrypted Bluetooth LE reporting. Use Value: 12-bit ADC with 1.14 Msps supports >1 kHz sampling for accurate waveform reconstruction; 1.65 V minimum supply enables direct use of aging primary cells. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32L071C8T7 | 128 KB Flash, 20 KB SRAM, same peripherals and low-power specs - larger memory footprint without increased current draw. | Suitable for applications requiring larger firmware (e.g., BLE stack + custom logic) or extended data buffering. | Select when firmware size exceeds 64 KB or additional RAM is needed for complex algorithms; identical pinout and software compatibility. |
| STM32L011K4T6 | 16 KB Flash, 2 KB SRAM, no EEPROM, fewer I/Os (25), same core and low-power architecture - scaled-down memory and I/O count. | Targeted at cost-sensitive, minimal-feature devices (e.g., simple switch controllers or basic sensors). | Choose for lowest BOM cost where memory and peripheral count are constrained; shares same LQFP32 footprint but reduced feature set. |
Compared with STM32L051C8T7TR, STM32L071C8T7 offers headroom for future firmware expansion without changing PCB layout, while STM32L011K4T6 reduces cost and size for simpler implementations-both maintain identical low-power behavior and toolchain compatibility.
Availability
STM32L051C8T7TR is available at Aetrix Electronics and suitable for smart metering, wireless sensor networks, industrial predictive maintenance, and medical wearable devices requiring stable component supply across multi-year production cycles.
Supply support for STM32L051C8T7TR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and analog components for industrial, automotive, and consumer markets.
The STM32L0 series targets ultra-low-power embedded applications demanding multi-year battery life, robust analog integration, and secure firmware execution-optimized for IoT edge nodes and portable medical devices.
FAQ
What is the maximum operating temperature for STM32L051C8T7TR?
The STM32L051C8T7TR is rated for operation from -40 °C to +125 °C ambient temperature. This extended industrial grade rating is validated per ST's DS10184 Rev 10 datasheet Section 6.3.1, making it suitable for deployment in harsh environments such as utility meters mounted outdoors or industrial motor control enclosures.
Does STM32L051C8T7TR support hardware encryption?
No, the STM32L051C8T7TR does not integrate dedicated hardware cryptographic accelerators (e.g., AES, SHA, PKA). It relies on software libraries for encryption tasks. For hardware-accelerated security, ST recommends the STM32L4 or STM32L5 series, which include CryptoCell-310 or AES engines.
Can STM32L051C8T7TR drive a standard LCD segment display directly?
Yes, the STM32L051C8T7TR supports static and 2/3/4-mux LCD driving via its integrated LCD controller (available in variants with LCD pins). However, the C8 package (LQFP32) does not expose LCD segment/com drivers - this functionality requires LQFP48 or LQFP64 packages (e.g., STM32L051R8 or STM32L051K8) with dedicated LCD pinouts.
Is the internal 32 kHz LSE oscillator calibrated at factory?
Yes, the internal 32 kHz LSE oscillator is factory-calibrated and stored in system memory. The calibration value is accessible via the RCC_BDCR register and can be used to adjust RTC prescaler for improved timekeeping accuracy. Datasheet Section 6.3.7 confirms typical accuracy of ±20 ppm after calibration against HSE reference.
STM32L051C8T7TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 48-LQFP
- Series:
- STM32L0
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- ARM® Cortex®-M0+
- Core Size:
- 32-Bit Single-Core
- Speed:
- 32MHz
- Connectivity:
- I2C, IrDA, SPI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, DMA, I2S, POR, PWM, WDT
- Number of I/O:
- 37
- Program Memory Size:
- 64KB (64K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 2K x 8
- RAM Size:
- 8K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.65V ~ 3.6V
- Data Converters:
- A/D 10x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L051C8T7TR FAQ
1.How can I place an order for STM32L051C8T7TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L051C8T7TR 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 STM32L051C8T7TR reliable?
The price and inventory of STM32L051C8T7TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L051C8T7TR is usually 5 days.
3.What payment methods are accepted for STM32L051C8T7TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L051C8T7TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L051C8T7TR?
STM32L051C8T7TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L051C8T7TR 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 STM32L051C8T7TR?
For technical support, including STM32L051C8T7TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L051C8T7TR requirements.
6.How does Aetrix verify that STM32L051C8T7TR is sourced from the original manufacturer or authorized distributors?
All STM32L051C8T7TR 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 STM32L051C8T7TR meets industry standards.
7.What is the process for return or replacement of STM32L051C8T7TR?
All STM32L051C8T7TR units undergo pre-shipment inspection (PSI). If there is an issue with STM32L051C8T7TR, 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 STM32L051C8T7TR part is unused and in its original packaging.
Return procedure for STM32L051C8T7TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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