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STMicroelectronics STM32L071CBT7
- Part No.:
- STM32L071CBT7
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
STM32L071CBT7.pdf
- Description:
- IC MCU 32BIT 128KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,254
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Product details
Overview
STM32L071CBT7 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller with 128 KB Flash, 20 KB SRAM, and 6 KB EEPROM; operates from 1.65–3.6 V across –40 to +125 °C; delivers 93 µA/MHz in Run mode and 0.29 µA in Standby mode with RTC active; used in battery-powered IoT sensors and portable medical monitors.
For engineers reviewing the STM32L071CBT7 datasheet, STM32L071CBT7 pinout, STM32L071CBT7 application, or STM32L071CBT7 equivalent, key selection criteria include ultra-low-power sleep current, integrated EEPROM endurance (100k cycles), 12-bit ADC accuracy (±2 LSB INL), and LQFP48 package compatibility with industrial-grade PCB assembly.
Technical Context
The STM32L071CBT7 implements a Cortex-M0+ core with Memory Protection Unit (MPU), supporting dynamic voltage scaling and multiple low-power modes including Stop mode with 0.43 µA consumption and RTC retention. Its clock system integrates factory-trimmed 16 MHz HSI (±1%), 32 kHz LSE for RTC calibration, and PLL for CPU frequency up to 32 MHz.
Analog subsystem includes a 12-bit ADC (1.14 Msps, 16-channel), two ultra-low-power comparators (wake-up capable down to 1.65 V), and internal temperature sensor with factory calibration. Peripherals are managed via an interconnect matrix enabling concurrent DMA transfers to ADC, USART, SPI, and timers without CPU intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M0+, 32-bit, 0.95 DMIPS/MHz - enables deterministic real-time control at low clock speeds for energy-constrained firmware. |
| Flash / SRAM / EEPROM | 128 KB Flash (ECC, read-while-write), 20 KB SRAM, 6 KB EEPROM (ECC) - supports robust firmware updates and nonvolatile data logging without external memory. |
| Power Consumption | 0.29 µA Standby (3 wakeup pins), 0.86 µA Stop+RTC+20KB RAM - extends coin-cell battery life to >10 years in periodic-sensing applications. |
| ADC Performance | 12-bit, 1.14 Msps, ±2 LSB INL, 16-channel - sufficient for precision analog signal acquisition in portable ECG or gas sensors. |
| Operating Voltage / Temp | 1.65–3.6 V supply, –40 to +125 °C - validated for automotive cabin modules and industrial edge nodes without external thermal management. |
| Timers & Interfaces | 11 timers (including LPTIM, RTC, watchdogs); 4x USART (2 ISO 7816/IrDA), 3x I2C (2 SMBus), 6x SPI - enables multi-protocol sensor hub and secure peripheral communication. |
Pinout & Package
LQFP48 (7 × 7 mm, 0.5 mm pitch), ECOPACK2-compliant, with 42 general-purpose I/Os (37 5V-tolerant), VDD/VSS power pairs, dedicated reset (NRST), and dedicated SWDIO/SWCLK debug pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual VDD/VSS pairs ensure stable core and I/O domain regulation; decoupling required per datasheet layout guidelines. |
| NRST | Active-low reset input | Internal pull-up; accepts external push-button or supervisor IC assertion; supports programmable PVD-triggered reset. |
| SWDIO / SWCLK | Serial Wire Debug interface | Two-pin debug port enabling full flash programming, breakpoint debugging, and real-time variable inspection without JTAG overhead. |
| PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD2 | General-purpose I/Os | 42 GPIOs support alternate functions (USART, SPI, I2C, ADC, timers); 37 tolerate 5 V - simplifies level-shifting in mixed-voltage systems. |
| VBAT | Battery backup supply | Connects to coin cell to retain RTC and 20-byte backup registers during main power loss - critical for time-stamped event logging. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power standby | 0.29 µA with 3 wakeup pins active - enables sub-millisecond wake on motion or environmental trigger without external interrupt controller. |
| Integrated EEPROM | 6 KB with ECC and 100k write/erase cycles - eliminates need for external serial EEPROM in firmware parameter storage or calibration data retention. |
| ADC with hardware oversampling | 12-bit resolution, 1.14 Msps, configurable oversampling ratio up to 256× - achieves 16-bit effective resolution for high-accuracy sensor digitization. |
| Low-power timer (LPTIM) | 16-bit counter running from 32 kHz LSE or ultra-low-power RC - provides precise timing for periodic wakeups or PWM generation while consuming <1 µA. |
| Programmable voltage detector (PVD) | Configurable threshold monitoring of VDD - triggers interrupt or reset before brownout, protecting firmware integrity during battery sag or supply transients. |
Applications
| Smart Utility Meter | Portable Medical Monitor |
|---|---|
Use Scenario: Battery-operated water/gas meter reading data every 15 minutes and transmitting via NB-IoT. IC Role / Device Role / Timing Role: Main controller managing sensor polling, RTC-based scheduling, AES encryption, and low-power RF interface timing. Use Value: 0.29 µA Standby current and integrated 6 KB EEPROM enable >15-year battery life and secure firmware update storage without external components. | Use Scenario: Wearable pulse oximeter acquiring SpO₂ and heart rate continuously for 72 hours on a single CR2032 cell. IC Role / Device Role / Timing Role: Signal acquisition controller driving LED drivers, sampling ADC at 100 Hz, and processing IR/red photodiode signals in real time. Use Value: 12-bit ADC with ±2 LSB INL and hardware oversampling ensures clinical-grade saturation accuracy; LPTIM synchronizes LED pulsing to minimize power. |
| Industrial Sensor Node | Automotive Cabin Controller |
Use Scenario: Wireless vibration/temperature node mounted on HVAC motors, reporting condition data hourly via LoRaWAN. IC Role / Device Role / Timing Role: Edge intelligence unit performing FFT preprocessing, RTC-triggered wake, and SPI-connected MEMS accelerometer interfacing. Use Value: 0.86 µA Stop+RTC+RAM retention preserves context across sleep; 7-channel DMA offloads CPU during burst ADC reads. | Use Scenario: Dashboard ambient light and occupancy controller using capacitive touch and ambient light sensing in vehicle cabins. IC Role / Device Role / Timing Role: System manager handling I²C-connected ALS/proximity sensors, PWM dimming, and CAN bus status reporting via USART-to-CAN bridge. Use Value: –40 to +125 °C rating and 5V-tolerant I/Os eliminate level shifters; dual comparators enable windowed light detection with wake-on-change. |
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 |
|---|---|---|---|
| STM32L072CBT6 | Same package and pinout; adds USB 2.0 FS device interface and 1 KB additional SRAM. | Required where host-controlled firmware updates or HID-class peripherals are needed. | Select when USB connectivity is mandatory; otherwise identical power/performance profile. |
| STM32L031K6T6 | Smaller footprint (UFQFPN32); 32 KB Flash, 8 KB SRAM, no EEPROM; same core and low-power architecture. | Suitable for cost-sensitive, space-constrained designs with simpler firmware and no persistent data logging. | Choose for minimal BOM cost and PCB area; trade EEPROM and memory capacity for size reduction. |
Compared with STM32L072CBT6, the STM32L071CBT7 lacks USB but offers identical low-power performance and EEPROM - ideal for standalone sensor nodes. Versus STM32L031K6T6, it provides 4× more Flash, full EEPROM, and 2.5× more RAM - essential for field-upgradable firmware and complex sensor fusion algorithms.
Availability
STM32L071CBT7 is available at Aetrix Electronics and suitable for smart utility meters, portable medical monitors, industrial sensor nodes, and automotive cabin controllers requiring stable component supply across extended product lifecycles.
Supply support for STM32L071CBT7 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 MEMS sensors for industrial, automotive, and consumer markets.
The STM32L0 series targets ultra-low-power embedded applications demanding long battery life, robust security, and integrated analog peripherals - optimized for IoT endpoints and portable electronics where energy efficiency defines system viability.
FAQ
What is the maximum operating frequency and corresponding power consumption in Run mode?
The STM32L071CBT7 runs at 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), verified per DS10690 Rev 7 Table 29. This value assumes code execution from Flash with active peripherals disabled; adding ADC or UART increases current by measured increments documented in Tables 39–40.
Does the STM32L071CBT7 support hardware encryption or secure boot features?
No - the STM32L071CBT7 does not integrate hardware cryptographic accelerators (AES, SHA, PKA) or secure boot ROM. It relies on software-based encryption libraries and external secure elements for advanced security. For built-in crypto, consider STM32L4/L5 series or STM32G071 with AES-128 engine.
Can the integrated EEPROM be used for storing calibration coefficients across power cycles?
Yes - the 6 KB data EEPROM supports 100,000 write/erase cycles and 20-year data retention at 85 °C (DS10690 Section 6.3.9). Calibration values written during factory test or field adjustment persist through power loss and are accessible via standard HAL_EEPROM APIs without external memory.
What debug interfaces are supported, and is JTAG available?
Only Serial Wire Debug (SWD) is supported via SWDIO and SWCLK pins; JTAG is not implemented on this device. SWD provides full debug functionality - flash programming, breakpoints, register inspection - using two pins and standard tools like ST-LINK/V2 or SEGGER J-Link. No JTAG header or TDI/TDO pins exist.
STM32L071CBT7 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:
- 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 ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L071CBT7 FAQ
1.How can I place an order for STM32L071CBT7 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L071CBT7 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 STM32L071CBT7 reliable?
The price and inventory of STM32L071CBT7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L071CBT7 is usually 5 days.
3.What payment methods are accepted for STM32L071CBT7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L071CBT7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L071CBT7?
STM32L071CBT7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L071CBT7 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 STM32L071CBT7?
For technical support, including STM32L071CBT7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L071CBT7 requirements.
6.How does Aetrix verify that STM32L071CBT7 is sourced from the original manufacturer or authorized distributors?
All STM32L071CBT7 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 STM32L071CBT7 meets industry standards.
7.What is the process for return or replacement of STM32L071CBT7?
All STM32L071CBT7 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L071CBT7, 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 STM32L071CBT7 part is unused and in its original packaging.
Return procedure for STM32L071CBT7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM32L071CBT7 Tags
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