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STMicroelectronics STM32L071CBT3TR
- Part No.:
- STM32L071CBT3TR
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
STM32L071CBT3TR.pdf
- Description:
- IC MCU 32BIT 128KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,003
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Product details
Overview
STM32L071CBT3TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in LQFP48 package, featuring 192 KB Flash, 20 KB SRAM, 6 KB EEPROM with ECC, 12-bit ADC (1.14 Msps), and operation down to 1.65 V. It delivers 0.86 µA Stop mode + RTC + RAM retention and 5 µs wakeup from Flash-enabling battery-powered sensor nodes and portable medical devices.
For engineers reviewing the STM32L071CBT3TR datasheet, STM32L071CBT3TR pinout, STM32L071CBT3TR application, or STM32L071CBT3TR equivalent, key selection criteria include verified low-power mode current specs (e.g., 0.43 µA Stop), Flash/ECC configuration, 78 I/Os with 5V tolerance, and dual ultra-low-power comparators with wake-up capability.
Technical Context
This MCU implements a single-core Arm Cortex-M0+ with Memory Protection Unit (MPU), operating from 32 kHz to 32 MHz with 0.95 DMIPS/MHz performance. Its power architecture integrates five low-power modes-including Standby (0.29 µA), Stop (0.43 µA), and Run (93 µA/MHz)-with hardware-accelerated voltage scaling and brownout reset (BOR) with five threshold levels.
The peripheral interconnect matrix enables concurrent use of up to 4 USARTs (2 ISO 7816/IrDA-capable), 6 SPIs (16 Mbit/s), 3 I2Cs (2 SMBus/PMBus), 11 timers (including ultra-low-power LPTIM), and 7-channel DMA-supporting deterministic real-time control in energy-constrained systems without external clock conditioning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M0+ @ up to 32 MHz; 0.95 DMIPS/MHz - enables efficient firmware execution with minimal clock cycles per instruction. |
| Flash / EEPROM | 192 KB Flash with ECC & read-while-write; 6 KB EEPROM with ECC - supports robust firmware updates and nonvolatile data logging without external memory. |
| RAM | 20 KB SRAM with full retention in Stop mode - preserves context across deep sleep for rapid system recovery. |
| ADC | 12-bit, 1.14 Msps, 16-channel; operational down to 1.65 V - allows high-resolution analog sensing directly from coin-cell or single-LiSOCl₂ supply rails. |
| Low-Power Modes | 0.29 µA Standby (3 wakeup pins); 0.43 µA Stop (16 wakeup lines); 0.86 µA Stop+RTC+20KB RAM - enables multi-year battery life in intermittent-sensing applications. |
| Timers | 11 timers including 2x 16-bit advanced (4-channel), 1x ultra-low-power LPTIM, RTC, SysTick, and 2 watchdogs - provides precise timing, pulse generation, and safety monitoring in one die. |
| I/O Voltage | 78 I/Os 5V tolerant - simplifies interface with legacy peripherals and industrial sensors without level-shifting circuitry. |
Pinout & Package
LQFP48 (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant, ECOPACK2 certified.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply (1.65–3.6 V) | Main digital/analog supply rail; requires local 100 nF decoupling per VDD pin for stable low-power operation. |
| VSS | Ground reference | Digital and analog ground return; must be connected to low-impedance PCB plane to minimize noise coupling into ADC/comparators. |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; accepts 1.65–3.6 V logic; supports external reset button or supervisor IC assertion. |
| PA0–PA15 | General-purpose I/O (GPIO) | 5V-tolerant; configurable as analog input, EXTI interrupt source, or alternate function (e.g., USART2_TX, ADC_IN0). |
| PC13–PC15 | Low-power oscillator pins | Connect 32.768 kHz crystal for RTC calibration; PC14/PC15 support ±20 ppm accuracy with internal load capacitance tuning. |
| BOOT0 | Boot mode selection | High at reset forces system memory boot (USART/I2C/SPI bootloader); tied low for normal Flash execution. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power BOR | 5 selectable thresholds (1.6–2.8 V) - ensures reliable reset during battery voltage sag without external supervisor IC. |
| Pre-programmed bootloader | Supports UART, I2C, SPI interfaces - enables field firmware updates without JTAG/SWD debug probe. |
| Dual ultra-low-power comparators | Operational down to 1.65 V with window mode and wake-up capability - replaces discrete comparator + microcontroller combos in threshold-detection circuits. |
| Hardware CRC unit | 32-bit polynomial (0x04C11DB7) acceleration - offloads checksum computation from CPU during OTA update verification or sensor data integrity checks. |
| Serial wire debug (SW-DP) | 2-pin debug interface with SWO trace - enables real-time code profiling and low-overhead debugging in space-constrained PCB layouts. |
Applications
| Smart Utility Metering | Wearable Health Monitor |
|---|---|
Use Scenario: Battery-powered gas/water meter with hourly pressure/temperature sampling and LoRaWAN transmission. IC Role / Device Role / Timing Role: Main system controller managing sensor acquisition, RTC-based scheduling, AES-128 encryption, and low-power radio interface. Use Value: 0.43 µA Stop mode extends 2xAA alkaline battery life beyond 10 years; 6 KB EEPROM stores calibration coefficients and usage logs with ECC protection. |
Use Scenario: ECG patch recording heart rate variability and motion artifacts over 72-hour clinical sessions. IC Role / Device Role / Timing Role: Signal acquisition hub synchronizing 12-bit ADC sampling, accelerometer data fusion, and Bluetooth LE packetization. Use Value: 1.14 Msps ADC captures high-fidelity bio-potentials; 5 µs wakeup from Flash ensures sub-millisecond response to arrhythmia detection triggers. |
| Industrial Wireless Sensor Node | Asset Tracking Beacon |
Use Scenario: DIN-rail mounted vibration/temperature node transmitting via NB-IoT every 15 minutes. IC Role / Device Role / Timing Role: Power-aware coordinator handling MEMS sensor SPI reads, temperature-compensated RTC wakeups, and modem control. Use Value: 78 5V-tolerant I/Os simplify connection to legacy 5 V industrial sensors; ultra-low-power comparators monitor supply rail faults without CPU intervention. |
Use Scenario: GPS-denied indoor logistics tag using BLE proximity and accelerometer-based motion detection. IC Role / Device Role / Timing Role: Low-duty-cycle state manager activating GPS/BLE only on motion-triggered wake-up via LPTIM and comparator events. Use Value: 0.29 µA Standby mode with 3 dedicated wakeup pins enables >5-year CR2032 operation; 20-byte backup registers retain last known location during power loss. |
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 |
|---|---|---|---|
| STM32L072CBT3TR | Same core, memory, and peripherals but adds AES-128 hardware accelerator and true random number generator (TRNG) | Required for secure firmware updates or cryptographic key generation in regulated medical/industrial deployments | Select when FIPS 140-2 compliance or secure boot chain is mandatory; otherwise, STM32L071CBT3TR offers identical low-power performance at lower cost. |
| STM32L031K6T6 | Smaller footprint (LQFP32), 32 KB Flash, 8 KB SRAM, no EEPROM, fewer peripherals (2x USART, 1x SPI, 1x I2C) | Suitable for simpler sensor endpoints where memory and interface count are constrained | Choose for cost-sensitive, size-limited designs lacking RTC/data logging requirements; not drop-in due to pin count and peripheral reduction. |
Compared with STM32L072CBT3TR, this part omits crypto accelerators but matches all power/performance specs-making it optimal for non-secure sensing. Versus STM32L031K6T6, it delivers 6× more Flash, EEPROM persistence, and expanded connectivity for feature-rich edge nodes.
Availability
STM32L071CBT3TR is available at Aetrix Electronics and suitable for smart utility metering, wearable health monitors, industrial wireless sensor nodes, and asset tracking beacons requiring stable component supply across multi-year production cycles.
Supply support for STM32L071CBT3TR 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, and sensors for industrial, automotive, and consumer markets.
This device belongs to the STM32L0 Access line-engineered specifically for ultra-low-power embedded applications demanding multi-year battery life, robust memory integrity, and integrated analog signal conditioning without external components.
FAQ
What is the maximum operating frequency and corresponding power consumption in Run mode?
The STM32L071CBT3TR operates up to 32 MHz with dynamic voltage scaling. At 32 MHz and 3.3 V, typical Run mode current is 93 µA/MHz (≈3.0 mA total), measured with code executing from Flash and peripherals active. This value scales linearly with clock frequency and drops to 65 µA/MHz in low-voltage range (1.65–2.2 V).
Does this MCU support hardware encryption or secure boot features?
No-STM32L071CBT3TR lacks dedicated cryptographic accelerators (AES, PKA) and secure boot ROM. It supports software-based encryption libraries and standard boot modes (system memory, Flash, SRAM). For hardware security, consider STM32L072CBT3TR, which integrates AES-128 and TRNG.
Can the 6 KB EEPROM be used for parameter storage without wear-leveling firmware?
Yes-the integrated 6 KB EEPROM includes built-in ECC and endurance rated for 100,000 write/erase cycles with 20-year data retention at 85 °C. ST provides HAL drivers (HAL_FLASHEx_DATAEEPROM_Unlock/Write) that abstract page management, eliminating need for custom wear-leveling in most applications.
What debug interfaces are supported, and is SWD compatible with standard J-Link probes?
It supports Serial Wire Debug (SWD) via SWCLK/SWDIO pins (PA14/PA13) and does not require JTAG. Standard SEGGER J-Link, ST-LINK/V2-1, and CMSIS-DAP debuggers are fully compatible-enabling breakpoints, memory inspection, and real-time variable watch without additional hardware.
STM32L071CBT3TR 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:
- 128KB (128K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 6K x 8
- RAM Size:
- 20K x 8
- Voltage - Supply (Vcc/Vdd):
- 1.65V ~ 3.6V
- Data Converters:
- A/D 13x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L071CBT3TR FAQ
1.How can I place an order for STM32L071CBT3TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L071CBT3TR 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 STM32L071CBT3TR reliable?
The price and inventory of STM32L071CBT3TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L071CBT3TR is usually 5 days.
3.What payment methods are accepted for STM32L071CBT3TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L071CBT3TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L071CBT3TR?
STM32L071CBT3TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L071CBT3TR 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 STM32L071CBT3TR?
For technical support, including STM32L071CBT3TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L071CBT3TR requirements.
6.How does Aetrix verify that STM32L071CBT3TR is sourced from the original manufacturer or authorized distributors?
All STM32L071CBT3TR 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 STM32L071CBT3TR meets industry standards.
7.What is the process for return or replacement of STM32L071CBT3TR?
All STM32L071CBT3TR units undergo pre-shipment inspection (PSI). If there is an issue with STM32L071CBT3TR, 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 STM32L071CBT3TR part is unused and in its original packaging.
Return procedure for STM32L071CBT3TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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