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STMicroelectronics STM32L051C6U6
- Part No.:
- STM32L051C6U6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-UFQFN Exposed Pad
- Datasheet:
-
STM32L051C6U6.pdf
- Description:
- IC MCU 32BIT 32KB FLASH 48UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:2,334
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Product details
Overview
STM32L051C6U6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN32 (5×5 mm) package, featuring 32 KB Flash, 8 KB SRAM, 2 KB EEPROM with ECC, 12-bit ADC (1.14 Msps), and operation down to 1.65 V. It delivers 0.95 DMIPS/MHz at up to 32 MHz and supports 45 5V-tolerant I/Os - deployed in battery-powered sensor nodes and portable medical devices requiring sub-µA standby current.
For engineers reviewing the STM32L051C6U6 datasheet, STM32L051C6U6 pinout, STM32L051C6U6 application, or STM32L051C6U6 equivalent, key selection criteria include verified ultra-low-power mode timing (3.5 µs RAM wakeup), integrated ECC for Flash/EEPROM, dual ultra-low-power comparators with wake-up capability, and support for ISO 7816/IRDA via USART.
Technical Context
The STM32L051C6U6 integrates an Arm Cortex-M0+ core with Memory Protection Unit (MPU), operating from 32 kHz to 32 MHz using multiple clock sources: HSI16 (±1%), LSE (32 kHz RTC), MSI (65 kHz–4.2 MHz), and PLL. Its power architecture enables five low-power modes - Standby (0.27 µA), Stop (0.4 µA), and Stop+RTC+RAM retention (0.8 µA) - all with configurable wakeup sources including 16 lines and 2 pins.
Analog subsystem includes a 12-bit ADC with 16-channel multiplexing, two independent ultra-low-power comparators (operable down to 1.65 V, window mode + wake-up), and internal voltage reference (VREFINT). Peripherals are interconnected via a dedicated matrix supporting concurrent DMA transfers to ADC, SPI, I²C, USART, and timers without CPU intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M0+, 32-bit, with MPU - enables secure task isolation in resource-constrained firmware. |
| Max Clock Frequency | 32 MHz - supports real-time control loops and communication stacks at full speed with 0.95 DMIPS/MHz efficiency. |
| Memory | 32 KB Flash (ECC-protected), 8 KB SRAM, 2 KB EEPROM (ECC-protected) - ensures data integrity in long-life industrial logging. |
| ADC | 12-bit, 1.14 Msps, 16-channel - captures fast transients in sensor fusion applications with minimal external signal conditioning. |
| Low-Power Modes | Standby: 0.27 µA (2 wakeup pins); Stop: 0.4 µA (16 wakeup lines); Stop+RTC+8KB RAM: 0.8 µA - extends coin-cell battery life to >10 years. |
| I/O Voltage Tolerance | 45 of 51 I/Os are 5V tolerant - simplifies interface with legacy peripherals without level-shifting circuitry. |
| Wakeup Time | 3.5 µs from RAM, 5 µs from Flash - meets hard real-time response requirements in fault-monitoring systems. |
Pinout & Package
STM32L051C6U6 is housed in a 32-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN32) package measuring 5×5 mm with 0.5 mm pitch, optimized for space-constrained PCB layouts and automated assembly. Thermal pad on underside enhances thermal dissipation in sealed enclosures.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply (1.65–3.6 V) | Primary core and I/O domain supply; requires local 100 nF decoupling per VDD pin. |
| VSS | Ground reference | Dedicated analog/digital ground pins must be connected to low-impedance plane to maintain ADC accuracy. |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; accepts 1.65–3.6 V logic; supports external push-button or supervisor IC. |
| PA0–PA15 | General-purpose I/O / Alternate functions | Supports UART, SPI, I²C, ADC_INx, comparator inputs - configurable as 5V-tolerant digital I/O or analog input. |
| PB0–PB11 | General-purpose I/O / Alternate functions | Includes LPTIM1_IN1, RTC_REFIN, USART2_CK - enables precise timing and low-power wake-up from deep sleep. |
| BOOT0 | Boot mode selection | High at reset enables system memory bootloader (USART/SPI); tied low for normal Flash execution. |
Key Features
| Feature | Design Value |
|---|---|
| ECC on Flash & EEPROM | Single-bit error correction and double-bit error detection - prevents silent data corruption in field-deployed firmware and calibration storage. |
| Dual Ultra-Low-Power Comparators | Operate down to 1.65 V with window mode and independent wake-up capability - replaces external comparator ICs in battery voltage monitoring. |
| Programmable Voltage Detector (PVD) | 5 selectable thresholds (2.0–2.8 V) - enables adaptive brownout response before critical supply collapse in energy-harvesting systems. |
| 7-Channel DMA Controller | Offloads ADC, USART, SPI, I²C, and timer data movement - reduces CPU load and active time, directly lowering system power. |
| Serial Wire Debug (SW-DP) | 2-pin debug interface with full SWD protocol support - enables non-intrusive firmware validation and low-pin-count production programming. |
Applications
| Smart Utility Metering | Portable Medical Sensors |
|---|---|
|
Use Scenario: Battery-powered gas/water meter with pulse counting, temperature compensation, and RF telemetry. IC Role / Device Role / Timing Role: Main controller executing metrology algorithms, managing LoRaWAN stack, and scheduling periodic wake-ups via LPTIM and RTC. Use Value: 0.27 µA Standby current and 3.5 µs wakeup enable >15-year battery life while maintaining sub-second response to tamper events. |
Use Scenario: Disposable ECG patch with analog front-end, motion artifact filtering, and Bluetooth LE transmission. IC Role / Device Role / Timing Role: Signal acquisition controller interfacing 12-bit ADC and dual comparators for R-peak detection and lead-off monitoring. Use Value: Integrated 2 KB EEPROM stores patient-specific calibration; 5V-tolerant I/Os simplify connection to op-amp stages without level shifters. |
| Industrial Wireless Sensor Node | Asset Tracking Beacon |
|
Use Scenario: Vibration and temperature monitor in predictive maintenance system, transmitting data via NB-IoT every 10 minutes. IC Role / Device Role / Timing Role: Host processor managing sensor fusion (accelerometer + thermistor), CRC-verified data logging, and cellular modem handshaking. Use Value: 0.8 µA Stop+RTC+RAM mode preserves context across transmissions; 88 µA/MHz Run-mode efficiency minimizes duty-cycle energy loss. |
Use Scenario: GPS-denied indoor asset tracker using BLE beaconing and accelerometer-triggered location updates. IC Role / Device Role / Timing Role: Low-power state manager activating GPS/BLE only on motion detection via comparator-driven wakeup from Stop mode. Use Value: Dual comparators with window mode detect threshold-crossing motion events while consuming <100 nA - extending CR2032 life beyond 2 years. |
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 |
|---|---|---|---|
| STM32L071C8T6 | 64 KB Flash, 20 KB RAM, same package - adds USB 2.0 FS device, more timers, and enhanced crypto acceleration. | Required when USB connectivity or larger firmware footprint is needed; higher BOM cost and power in active mode. | Select if future firmware expansion or host-side USB enumeration is required; not drop-in due to different Flash/RAM map. |
| EFM32PG12B500F1024GL125 | ARM Cortex-M4, 1024 KB Flash, 256 KB RAM, 1.25 µA deep-sleep - superior compute density but larger QFN64 package and no integrated EEPROM. | Suited for complex edge AI inference or multi-protocol stacks where Flash size and DSP extensions outweigh EEPROM need. | Choose when algorithm complexity demands M4 FPU or >512 KB Flash; requires external EEPROM for parameter storage. |
Compared with STM32L051C6U6, STM32L071C8T6 offers greater memory headroom and USB capability at higher static power, while EFM32PG12B500F1024GL125 delivers higher computational throughput but lacks on-chip EEPROM and increases PCB area - making STM32L051C6U6 optimal for cost-sensitive, EEPROM-dependent, space-constrained designs.
Availability
STM32L051C6U6 is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, and industrial wireless sensor nodes requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across temperature ranges.
Supply support for STM32L051C6U6 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, MEMS, and automotive semiconductors since 1987.
The STM32L0 series targets ultra-low-power embedded applications - emphasizing sub-µA standby, fast wakeup, integrated analog, and robust Flash/EEPROM reliability for battery-operated and energy-harvesting systems.
FAQ
What is the maximum operating temperature range for STM32L051C6U6?
The STM32L051C6U6 is rated for operation from –40 °C to +125 °C ambient temperature, validated per JEDEC JESD22-A108. This extended range supports deployment in automotive under-hood modules, industrial motor drives, and outdoor utility infrastructure without derating.
Does STM32L051C6U6 support hardware encryption?
No - the STM32L051C6U6 does not integrate hardware AES, DES, or SHA accelerators. It relies on software libraries for cryptographic operations. For hardware-accelerated security, consider STM32L07x or STM32L4x series with CryptoCell or AES engines.
Can STM32L051C6U6 run code directly from RAM?
Yes - the device supports execution from SRAM via remapping the memory address 0x00000000 to SRAM using SYSCFG_MEMRMP register. This enables fast interrupt response and deterministic timing-critical routines, though RAM size limits total executable footprint to ~8 KB.
Is the internal 32 kHz LSE oscillator calibrated for RTC accuracy?
Yes - the LSE oscillator supports RTC calibration via the RTC_CALIBR register (±511 ppm adjustment range), enabling ±1 ppm typical accuracy after factory calibration and temperature compensation using the internal temperature sensor and lookup table.
STM32L051C6U6 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 48-UFQFN Exposed Pad
- Series:
- STM32L0
- Packaging:
- Tray
- 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:
- 32KB (32K 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L051C6U6 FAQ
1.How can I place an order for STM32L051C6U6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L051C6U6 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 STM32L051C6U6 reliable?
The price and inventory of STM32L051C6U6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L051C6U6 is usually 5 days.
3.What payment methods are accepted for STM32L051C6U6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L051C6U6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L051C6U6?
STM32L051C6U6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L051C6U6 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 STM32L051C6U6?
For technical support, including STM32L051C6U6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L051C6U6 requirements.
6.How does Aetrix verify that STM32L051C6U6 is sourced from the original manufacturer or authorized distributors?
All STM32L051C6U6 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 STM32L051C6U6 meets industry standards.
7.What is the process for return or replacement of STM32L051C6U6?
All STM32L051C6U6 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L051C6U6, 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 STM32L051C6U6 part is unused and in its original packaging.
Return procedure for STM32L051C6U6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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