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STMicroelectronics STM32L051C8T7
- Part No.:
- STM32L051C8T7
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
STM32L051C8T7.pdf
- Description:
- IC MCU 32BIT 64KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:22,292
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Product details
Overview
STM32L051C8T7 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in LQFP32 package, featuring 64 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 performance at up to 32 MHz and supports 45 5V-tolerant I/Os - ideal for battery-powered sensor nodes and portable medical devices requiring long runtime and robust analog sensing.
For engineers reviewing the STM32L051C8T7 datasheet, STM32L051C8T7 pinout, STM32L051C8T7 application, or STM32L051C8T7 equivalent, key selection considerations include its sub-1 µA Stop mode + RTC retention, dual ultra-low-power comparators with wake-up capability, integrated 32 kHz RTC oscillator with calibration, and SW-DP debug support for low-power firmware validation.
Technical Context
The STM32L051C8T7 implements a tightly coupled Cortex-M0+ core with Memory Protection Unit (MPU), supporting dynamic voltage scaling across three power ranges (1.65–3.6 V) to optimize active and sleep-mode efficiency. Its clock system integrates factory-trimmed 16 MHz HSI (±1%), programmable MSI (65 kHz–4.2 MHz), and PLL for flexible CPU frequency control up to 32 MHz.
Analog subsystem includes a 12-bit ADC with up to 16 channels, two independent comparators operating down to 1.65 V (with window mode and interrupt/wake-up), and internal temperature sensor with factory calibration. Power management features BOR with five thresholds, PVD, and multiple low-power modes - Standby (0.27 µA), Stop (0.4 µA), and Stop+RTC+RAM retention (0.8 µA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | Arm Cortex-M0+ with MPU, 0.95 DMIPS/MHz @ 32 MHz - enables deterministic real-time control in energy-constrained systems. |
| Memory | 64 KB Flash (ECC-protected), 8 KB SRAM, 2 KB EEPROM (ECC-protected) - supports firmware updates and data logging without external memory. |
| ADC | 12-bit, 1.14 Msps, up to 16 channels, min. supply 1.65 V - allows high-resolution sensor acquisition directly from coin-cell or single-LiSOCl₂ sources. |
| Low-Power Modes | Standby: 0.27 µA (2 wakeup pins); Stop: 0.4 µA (16 wakeup lines); Stop+RTC+8KB RAM: 0.8 µA - enables multi-year battery life in intermittent-sensing applications. |
| Timers | 9x timers including 1x 16-bit ultra-low-power timer (LPTIM), 1x RTC, 2x watchdogs - provides precise timekeeping, event scheduling, and fail-safe supervision without waking CPU. |
| I/O | Up to 51 fast I/Os (45 5V-tolerant), configurable as GPIO, UART, SPI, I²C, or ADC inputs - simplifies interface to legacy peripherals and mixed-voltage sensors. |
| Debug | Serial Wire Debug (SW-DP) only - enables full firmware inspection and low-overhead tracing without dedicated JTAG pins. |
Pinout & Package
LQFP32 (7 × 7 mm, 0.8 mm pitch) package with 32-pin quad flat leaded outline - compatible with standard reflow processes and manual prototyping; RoHS-compliant and ECOPACK2 certified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Main 1.65–3.6 V supply for digital and analog domains; decoupling required per datasheet layout guidelines. |
| VSS | Ground reference | Digital ground return; separate analog ground (VSSA) is internally connected but requires external star-point routing for ADC accuracy. |
| NRST | Active-low reset input | Asynchronous reset pin with internal pull-up; accepts external push-button or supervisor IC assertion. |
| PA0–PA15 | General-purpose I/O | Configurable as GPIO, ADC_IN0–IN15, USART_TX/RX, SPI/I²C functions; PA0–PA7 support 5V-tolerant inputs in all modes. |
| PC13–PC15 | Low-power oscillator pins | Connect external 32.768 kHz crystal for RTC; PC14/PC15 require load capacitors (12.5 pF typical) and are not 5V-tolerant. |
| BOOT0 | Boot mode selection | Pulled low by default; high at reset forces system memory bootloader entry via USART1 or SPI. |
Key Features
| Feature | Design Value |
|---|---|
| ECC-protected memories | 64 KB Flash and 2 KB EEPROM include hardware error correction - prevents silent data corruption in field-deployed firmware and calibration storage. |
| Ultra-low-power comparators | Two independent comparators with window mode, 1.65 V min. operation, and wake-up capability - enables zero-CPU event detection (e.g., battery voltage threshold crossing). |
| Integrated RTC with calibration | 32 kHz LSE oscillator with ±10 ppm accuracy and software calibration register - eliminates need for external timing components in metering or logging applications. |
| Pre-programmed bootloader | Factory-loaded USART/SPI bootloader accessible via BOOT0 - allows field firmware updates without debugger hardware. |
| 96-bit unique ID | One-time-programmable silicon serial number - supports secure device authentication and license binding in IoT endpoints. |
Applications
| Smart Utility Metering | Portable Medical Sensors |
|---|---|
Use Scenario: Battery-powered gas/water meter with pulse counting, temperature compensation, and periodic RF transmission. IC Role / Device Role / Timing Role: Main controller managing sensor acquisition (ADC + temp sensor), RTC-based wake-up scheduling, and low-power UART-to-LoRaWAN bridge. Use Value: 0.8 µA Stop+RTC+RAM mode extends 10-year battery life; ECC Flash ensures firmware integrity over decades of OTA updates. |
Use Scenario: Disposable ECG patch with 3-lead analog front-end, motion artifact filtering, and Bluetooth LE telemetry. IC Role / Device Role / Timing Role: Signal processor running FIR filters on ADC samples, managing ultra-low-power sleep between heartbeats, and synchronizing BLE advertising intervals. Use Value: Dual comparators detect R-wave peaks without CPU involvement; 12-bit ADC resolves microvolt-level biopotentials at 1.65 V supply. |
| Industrial Wireless Sensor Node | Asset Tracking Beacon |
Use Scenario: Vibration/temperature node in predictive maintenance system, sampling every 5 minutes and transmitting via NB-IoT. IC Role / Device Role / Timing Role: System-on-chip handling MEMS sensor interface (SPI), self-calibration routines, and deep-sleep coordination with cellular modem. Use Value: 3.5 µs wake-up from RAM enables rapid sensor readout; 45 5V-tolerant I/Os simplify connection to legacy industrial transducers. |
Use Scenario: GPS-denied indoor asset tag using RSSI triangulation, accelerometer-triggered reporting, and coin-cell power. IC Role / Device Role / Timing Role: Low-power state machine monitoring motion (LIS3DH via I²C), managing backup SRAM retention, and controlling BLE radio duty cycle. Use Value: 0.27 µA Standby mode with 2-wakeup-pin flexibility minimizes quiescent drain; 96-bit UID enables tamper-proof fleet inventory tracking. |
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 - adds USB 2.0 FS device support and more DMA channels. | Required when firmware size exceeds 64 KB or USB connectivity is needed for configuration/diagnostic port. | Select if future firmware expansion or host-side USB provisioning is anticipated; otherwise, STM32L051C8T7 offers lower cost and identical power profile. |
| EFM32PG12B500F1024GL125 | ARM Cortex-M4, 1024 KB Flash, 256 KB RAM, 12-bit ADC (1 Msps), 0.5 µA Deep Sleep - higher performance but larger footprint (QFN64) and no EEPROM. | Suitable for complex edge processing (e.g., FFT-based vibration analysis) where code size and compute throughput outweigh EEPROM dependency. | Choose only when >100 KB firmware or floating-point math is mandatory; STM32L051C8T7 remains optimal for EEPROM-backed calibration and compact LQFP32 layout. |
Compared with STM32L071C8T7, the STM32L051C8T7 trades Flash capacity for cost and footprint efficiency while retaining identical low-power behavior and peripheral set; versus EFM32PG12B500, it offers smaller package, integrated EEPROM, and proven ST ecosystem tooling - critical for rapid certification in medical and utility markets.
Availability
STM32L051C8T7 is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, industrial wireless sensor nodes, and asset tracking beacons requiring stable component supply across multi-year production cycles.
Supply support for STM32L051C8T7 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 automotive semiconductors since 1987.
The STM32L0 series targets ultra-low-power embedded applications - optimized for battery-operated devices demanding sub-µA sleep currents, integrated analog precision, and long-term firmware reliability in harsh environments.
FAQ
What is the minimum operating voltage for the STM32L051C8T7 ADC?
The ADC operates down to 1.65 V supply voltage, enabling direct interfacing with single-cell LiSOCl₂ (3.6 V nominal) or two-cell alkaline (3.0 V nominal) batteries without regulation. At this voltage, full 12-bit resolution and 1.14 Msps sampling rate are maintained, with INL/DNL specified per Table 58 in DS10184 Rev 10.
Does the STM32L051C8T7 support hardware encryption or secure boot?
No - the STM32L051C8T7 lacks dedicated cryptographic accelerators or ROM-based secure boot. It provides a 96-bit unique ID and ECC on Flash/EEPROM for basic integrity, but secure key storage and AES/SHA operations require external ICs or software libraries with trade-offs in performance and side-channel resistance.
Can the internal 32 kHz RTC oscillator be used without an external crystal?
Yes - the LSI (37 kHz RC) can drive the RTC, but with ±50% accuracy and temperature drift. For time-critical applications like metering or alarm scheduling, the external 32.768 kHz crystal on PC14/PC15 is required; its calibration register (address 0x4000 2420) allows software trimming to ±10 ppm after soldering.
How many I/O pins support 5V tolerance on the STM32L051C8T7?
45 of the 51 I/Os are 5V-tolerant (PA0–PA15, PB0–PB15, PC0–PC13), confirmed in Section 3.7 and Table 54 of DS10184 Rev 10. Pins PC14, PC15, and OSC32_IN/OUT are excluded - applying 5V to these damages the oscillator circuit and invalidates RTC functionality.
STM32L051C8T7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 48-LQFP
- 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:
- 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:
STM32L051C8T7 FAQ
1.How can I place an order for STM32L051C8T7 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L051C8T7 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 STM32L051C8T7 reliable?
The price and inventory of STM32L051C8T7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L051C8T7 is usually 5 days.
3.What payment methods are accepted for STM32L051C8T7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L051C8T7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L051C8T7?
STM32L051C8T7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L051C8T7 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 STM32L051C8T7?
For technical support, including STM32L051C8T7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L051C8T7 requirements.
6.How does Aetrix verify that STM32L051C8T7 is sourced from the original manufacturer or authorized distributors?
All STM32L051C8T7 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 STM32L051C8T7 meets industry standards.
7.What is the process for return or replacement of STM32L051C8T7?
All STM32L051C8T7 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L051C8T7, 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 STM32L051C8T7 part is unused and in its original packaging.
Return procedure for STM32L051C8T7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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