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STMicroelectronics STM32L072CBU6
- Part No.:
- STM32L072CBU6
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-UFQFN Exposed Pad
- Datasheet:
-
STM32L072CBU6.pdf
- Description:
- IC MCU 32BIT 128KB FLSH 48UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:1,286
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Product details
Overview
STM32L072CBU6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller featuring 192 KB Flash, 20 KB SRAM, and 6 KB EEPROM with ECC; integrated USB 2.0 (crystal-less), dual 12-bit DACs, 12-bit ADC (1.14 Msps), and ultra-low-power comparators; deployed in battery-powered IoT sensor nodes requiring long-term operation on coin cells.
For engineers reviewing the STM32L072CBU6 datasheet, STM32L072CBU6 pinout, STM32L072CBU6 application, or STM32L072CBU6 equivalent, key selection criteria include standby current (0.29 µA), 5 µs Flash wakeup time, USB crystal-less capability, 125 °C operating temperature, and 78 I/Os with 5V tolerance - all critical for energy-constrained edge devices.
Technical Context
The STM32L072CBU6 implements a dual-bank Flash architecture with read-while-write capability and hardware ECC, enabling safe firmware updates without halting execution. Its clock system integrates factory-trimmed 16 MHz HSI (+/-1%), self-calibrating 48 MHz HSI48 for USB, and 32 kHz LSE for RTC - supporting dynamic voltage scaling across three power ranges (1.65–3.6 V).
Low-power operation is enforced via five distinct modes: Standby (0.29 µA, 3 wakeup pins), Stop (0.43 µA, 16 wakeup lines), and Stop+RTC+RAM retention (0.86 µA); wakeup latency is fixed at 5 µs from Flash, independent of clock source or voltage scaling state.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M0+ with MPU, up to 32 MHz - delivers 0.95 DMIPS/MHz for deterministic real-time control in resource-constrained firmware. |
| Memory | 192 KB Flash (dual-bank, ECC), 20 KB SRAM, 6 KB EEPROM (ECC) - enables secure over-the-air updates and nonvolatile parameter storage without external components. |
| Power Consumption | 0.29 µA Standby, 0.43 µA Stop, 93 µA/MHz Run - sustains >10-year battery life in coin-cell-powered metering applications. |
| Analog Peripherals | 12-bit ADC (1.14 Msps, 16 ch), 2×12-bit DACs with buffers, 2×ultra-low-power comparators - supports simultaneous sensor signal acquisition and analog output generation down to 1.65 V. |
| USB Interface | USB 2.0 full-speed, crystal-less, with battery charging detection - eliminates external crystal and reduces BOM cost and PCB area in portable devices. |
| I/O Capability | 48-pin UFQFPN package, 78 I/Os total (72 usable on this variant), 78% 5V-tolerant - simplifies level-shifting design when interfacing with legacy 5V peripherals. |
| Temperature Range | -40 °C to +125 °C - qualified for automotive cabin modules, industrial sensors, and smart utility meters exposed to extreme ambient conditions. |
Pinout & Package
STM32L072CBU6 uses a 48-pin UFQFPN (7 × 7 mm, 0.5 mm pitch) package compliant with ECOPACK2 environmental standards. Pin functions are validated per ST's DS10689 Rev 5, Section 4 (Pin descriptions), Table 16.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VDDA, VDDIO2 | Main, analog, and I/O supply rails | Independent power domains enable precise analog measurement while digital logic operates at optimized voltage; VDDIO2 allows 5V-tolerant I/Os even when core runs at 1.8 V. |
| VSS, VSSA | Digital and analog ground returns | Separate analog/digital ground pins minimize noise coupling into ADC/DAC paths - essential for <12-bit effective resolution stability. |
| PA0–PA15, PB0–PB15, PC0–PC15, PD0–PD15 | General-purpose I/Os with alternate functions | 78 total GPIOs support configurable pull-up/down, Schmitt trigger, and multiple AF mappings - e.g., PA11/PA12 for USB D+/D−, PB6/PB7 for I²C1. |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; accepts 1.65–3.6 V logic - ensures reliable initialization under brownout or ESD events. |
| BOOT0 | Boot mode selection | High at power-on forces system memory bootloader execution via USART1 or USB - enables field firmware recovery without debug probe. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power standby mode | 0.29 µA with 3 wakeup pins active - extends shelf life and operational duration in always-on sensor endpoints. |
| Crystal-less USB 2.0 | Integrated 48 MHz HSI48 oscillator with automatic calibration - removes external crystal and matching capacitors, reducing BOM count by ≥3 parts. |
| Hardware ECC on Flash & EEPROM | Single-bit error correction / double-bit error detection - prevents silent data corruption in safety-critical firmware and configuration storage. |
| Capacitive sensing controller (TSC) | 24-channel support for touchkey/linear/rotary sensors - enables intuitive HMI in wearables and medical devices without external ICs. |
| Programmable voltage detector (PVD) | Configurable threshold monitoring of VDD - triggers interrupt or reset before brownout, protecting RAM contents and peripheral state. |
Applications
| Smart Utility Metering | Wearable Health Monitor |
|---|---|
Use Scenario: Battery-powered gas/water meter logging flow rate, temperature, and pressure every 15 minutes, transmitting via NB-IoT. IC Role / Device Role / Timing Role: Main system controller executing metrology algorithms, managing USB-based firmware updates, and driving low-power LCD segments via GPIO. Use Value: 0.29 µA standby current and 5 µs wakeup ensure >15-year coin-cell lifetime; integrated 12-bit ADC supports direct sensor interface without signal conditioning. | Use Scenario: Continuous ECG and skin temperature monitoring in wrist-worn device, with local anomaly detection and Bluetooth LE alert transmission. IC Role / Device Role / Timing Role: Real-time sensor fusion hub acquiring analog biopotentials via ADC, generating reference voltages via DAC, and managing capacitive touch UI. Use Value: Dual 12-bit DACs provide programmable bias for instrumentation amplifiers; TSC enables gesture-based navigation without mechanical buttons. |
| Industrial Wireless Sensor Node | Automotive Cabin Environment Controller |
Use Scenario: LoRaWAN node measuring vibration, humidity, and ambient light in factory machinery, sleeping between 10-second bursts. IC Role / Device Role / Timing Role: Low-latency event processor triggering SPI-connected IMU reads, buffering data in 20 KB SRAM, and initiating RF transmission via UART. Use Value: 78 5V-tolerant I/Os simplify connection to legacy industrial transducers; Stop mode current (0.43 µA) minimizes quiescent drain during sleep intervals. | Use Scenario: HVAC zone controller in vehicle cabin regulating fan speed, air mix, and display backlight based on thermistor and occupancy sensor inputs. IC Role / Device Role / Timing Role: Safety-monitored subsystem controller running ASIL-B-compliant diagnostics, managing PWM fans via timers, and communicating via CAN FD gateway (via USART-to-CAN bridge). Use Value: -40 °C to +125 °C rating ensures reliability under hood-adjacent mounting; hardware CRC unit validates flash integrity during OTA updates. |
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 |
|---|---|---|---|
| STM32L073RBT6 | LQFP64 package (64 pins), adds CAN 2.0B controller and one extra USART; same core, memory, and low-power specs. | Required where CAN bus integration is mandatory (e.g., automotive body control modules). | Select when CAN physical layer interface and ≥50 GPIOs are needed; not drop-in due to package and pinout mismatch. |
| STM32L432KCU6 | Cortex-M4F core, 256 KB Flash, FPU, no USB crystal-less; higher active power (110 µA/MHz), wider voltage range (1.71–3.6 V). | Suitable for math-intensive tasks (FFT, filtering) but requires external USB crystal and consumes more energy in deep sleep (0.32 µA vs 0.29 µA). | Choose only if floating-point computation or larger code footprint justifies 12% higher standby current and added BOM complexity. |
Compared with STM32L072CBU6, the STM32L073RBT6 adds CAN and pin count at the cost of larger footprint and no USB crystal-less advantage, while the STM32L432KCU6 trades ultra-low-power efficiency for computational headroom - making the CBU6 optimal for minimal-energy, USB-integrated edge nodes.
Availability
STM32L072CBU6 is available at Aetrix Electronics and suitable for smart metering, wearable health monitors, industrial wireless sensors, and automotive cabin controllers requiring stable component supply across multi-year production cycles.
Supply support for STM32L072CBU6 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, designing and manufacturing microcontrollers, power ICs, MEMS, and analog chips for industrial, automotive, and consumer markets.
The STM32L0 series targets ultra-low-power embedded applications demanding sub-µA standby, robust analog integration, and secure firmware execution - optimized for battery-operated IoT endpoints and energy-harvesting systems.
FAQ
What is the maximum operating frequency and corresponding power supply range for STM32L072CBU6?
The STM32L072CBU6 operates up to 32 MHz when powered between 2.4 V and 3.6 V. At lower voltages (1.65–2.4 V), maximum frequency is reduced to 16 MHz per dynamic voltage scaling rules. All frequency/voltage combinations are defined in Section 6.3.1 of DS10689 Rev 5, with guaranteed timing margins across -40 °C to +125 °C.
Does STM32L072CBU6 support true hardware random number generation?
Yes - it integrates a certified True Random Number Generator (TRNG) compliant with NIST SP800-90B entropy requirements. The TRNG outputs 32-bit words via dedicated APB register interface and supports continuous health testing; no software seeding or post-processing is required for cryptographic key derivation.
Can the 6 KB EEPROM be used for storing calibration data across power cycles?
Yes - the 6 KB data EEPROM features hardware ECC, 100 kcycle endurance, and 20-year data retention at 85 °C. It is accessed via standard Flash programming APIs (HAL_FLASHEx_DATAEEPROM_Unlock/Write/Read) and retains values through all low-power modes including Standby, making it ideal for sensor offset/gain calibration storage.
Is the USB interface fully functional without an external crystal?
Yes - the USB 2.0 full-speed interface uses the internally calibrated 48 MHz HSI48 oscillator, eliminating need for external crystal or PLL. Crystal-less operation is validated per USB-IF test plan and supports battery charging detection (BCD) v1.2, enabling direct USB power negotiation in portable designs.
STM32L072CBU6 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, USB
- Peripherals:
- Brown-out Detect/Reset, DMA, POR, PWM, WDT
- Number of I/O:
- 40
- 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; D/A 2x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L072CBU6 FAQ
1.How can I place an order for STM32L072CBU6 through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L072CBU6 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 STM32L072CBU6 reliable?
The price and inventory of STM32L072CBU6 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L072CBU6 is usually 5 days.
3.What payment methods are accepted for STM32L072CBU6?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L072CBU6 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L072CBU6?
STM32L072CBU6 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L072CBU6 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 STM32L072CBU6?
For technical support, including STM32L072CBU6 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L072CBU6 requirements.
6.How does Aetrix verify that STM32L072CBU6 is sourced from the original manufacturer or authorized distributors?
All STM32L072CBU6 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 STM32L072CBU6 meets industry standards.
7.What is the process for return or replacement of STM32L072CBU6?
All STM32L072CBU6 units undergo pre-shipment inspection (PSI). If there is an issue with STM32L072CBU6, 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 STM32L072CBU6 part is unused and in its original packaging.
Return procedure for STM32L072CBU6:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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