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STMicroelectronics STM32L072KBU7TR
- Part No.:
- STM32L072KBU7TR
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
STM32L072KBU7TR.pdf
- Description:
- IC MCU 32BIT 128KB FLSH 32UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:2,737
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Product details
Overview
STM32L072KBU7TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in UFQFPN32 (5×5 mm) package, featuring 192 KB Flash with ECC, 20 KB SRAM, 6 KB EEPROM, USB 2.0 crystal-less interface, and dual 12-bit DACs. It operates from 1.65–3.6 V across –40 to +125 °C and delivers 93 µA/MHz in Run mode-ideal for battery-powered IoT sensor nodes requiring long-term autonomous operation with analog signal conditioning and USB connectivity.
For engineers reviewing the STM32L072KBU7TR datasheet, STM32L072KBU7TR pinout, STM32L072KBU7TR application, or STM32L072KBU7TR equivalent, key selection criteria include ultra-low-power Stop/Standby current (0.43 µA / 0.29 µA), integrated USB clock recovery (HSI48 self-calibration), 12-bit ADC at 1.14 Msps with 16 channels, dual buffered DACs down to 1.8 V, and capacitive touch sensing support for compact wearable or smart meter designs.
Technical Context
The STM32L072KBU7TR implements a dual-bank Flash architecture enabling read-while-write operation and hardware ECC for robust firmware integrity. Its power management includes five BOR thresholds, programmable voltage detector (PVD), and dynamic voltage scaling to optimize performance vs. energy consumption across operating modes.
Clock system integration features factory-trimmed 16 MHz HSI, 48 MHz HSI48 (USB-calibrated), 32 kHz LSE for RTC, and PLL supporting up to 32 MHz CPU frequency. Analog subsystem combines two independent 12-bit DACs with output buffers, two ultra-low-power comparators (with window mode and wake-up capability), and a 12-bit ADC capable of 10 ksps at 41 µA-enabling simultaneous precision measurement and actuation control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core | Arm Cortex-M0+ @ up to 32 MHz; 0.95 DMIPS/MHz - enables real-time control with minimal code footprint and deterministic interrupt latency. |
| Memory | 192 KB Flash (dual-bank, ECC), 20 KB SRAM, 6 KB EEPROM (ECC) - supports secure firmware updates, data logging, and parameter retention without external memory. |
| Power Consumption | 0.29 µA Standby (3 wakeup pins), 0.43 µA Stop (16 wakeup lines), 93 µA/MHz Run - extends battery life in coin-cell or energy-harvesting applications. |
| Analog Peripherals | 12-bit ADC (1.14 Msps, 16 ch), 2×12-bit DACs (buffered, 1.8 V min), 2×ULP comparators - enables closed-loop analog control and sensor signal chain integration. |
| USB Interface | USB 2.0 full-speed, crystal-less with HSI48 self-calibration - eliminates external crystal, reducing BOM cost and PCB area in portable devices. |
| Timers & Connectivity | 11 timers (including LPTIM, RTC, SysTick), 1x USB, 4x USART (2 ISO 7816/IrDA), 6x SPI, 3x I2C - supports multi-protocol communication and precise timing for industrial and consumer edge nodes. |
| Package | UFQFPN32 (5 × 5 mm, 0.5 mm pitch) - compact footprint suitable for space-constrained wearables and smart sensors. |
Pinout & Package
STM32L072KBU7TR is housed in a 32-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN) package measuring 5 × 5 mm with 0.5 mm pitch and exposed thermal pad. The package complies with ECOPACK2 environmental standards and supports reflow soldering per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual VDD/VSS pairs ensure stable core and I/O domain operation; supports 1.65–3.6 V supply range with internal regulator. |
| PA0–PA15, PB0–PB11 | General-purpose I/O | Up to 26 GPIOs (78 total on full variant); 78 I/Os are 5V-tolerant - simplifies level-shifting in mixed-voltage systems. |
| PA2/PA3 | USART2 TX/RX | Dedicated low-power UART interface usable in Stop mode - enables asynchronous wake-up and debug over serial without full MCU activation. |
| PA11/PA12 | USB D+/D− | Crystal-less USB 2.0 full-speed interface with integrated transceivers and HSI48 calibration - eliminates external oscillator and reduces component count. |
| PA4–PA7 | ADC1_IN0–IN3 | Four dedicated analog input channels for 12-bit ADC - supports direct connection of temperature, pressure, or battery monitoring sensors. |
| PA4/PB0 | DAC1_OUT/DAC2_OUT | Buffered analog outputs with rail-to-rail swing down to 1.8 V - drives actuators, reference voltages, or audio transducers directly. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power Stop mode | 0.43 µA with 16 wakeup lines active - enables event-driven operation while preserving RAM and register state for rapid resumption. |
| USB crystal-less operation | HSI48 oscillator calibrated to ±0.25% via USB SOF packets - removes need for external 48 MHz crystal, saving cost and board space. |
| Dual 12-bit DACs with buffers | Output drive capability ≥5 mA, monotonicity guaranteed, 1.8 V minimum supply - supports analog waveform generation and precision biasing without external op-amps. |
| Capacitive touch sensing | 24-channel TSC with built-in charge transfer and noise immunity - enables robust touchkey, slider, and rotary control in humid or noisy environments. |
| Hardware CRC unit & 96-bit UID | Firmware integrity verification and unique device identification - essential for secure boot, OTA updates, and anti-cloning in certified industrial deployments. |
Applications
| Smart Utility Meter | Wearable Health Monitor |
|---|---|
Use Scenario: Battery-powered electricity/water/gas meter with tamper detection, pulse counting, and periodic wireless reporting. IC Role / Device Role / Timing Role: Main controller managing metrology ADC sampling, EEPROM-based tariff storage, RTC-corrected billing intervals, and low-power UART/USB firmware updates. Use Value: 0.29 µA Standby current and 5 µs Flash wakeup enable >10-year battery life; integrated 6 KB EEPROM ensures reliable tariff and calibration data retention without external NV memory. | Use Scenario: Compact wrist-worn device measuring heart rate, skin temperature, and motion via optical/thermal/accelerometer sensors. IC Role / Device Role / Timing Role: Sensor hub aggregating analog inputs (PPG, thermistor), driving OLED display via SPI, and communicating via USB or BLE companion interface. Use Value: Dual 12-bit DACs generate precise LED drive currents; 24-channel TSC supports multi-zone capacitive touch for intuitive UI; 125 °C rating allows safe operation near body heat sources. |
| Industrial Wireless Sensor Node | Smart Building Occupancy Controller |
Use Scenario: Self-powered node monitoring temperature, humidity, and CO₂ in HVAC ducts using energy harvesting (e.g., thermal or RF). IC Role / Device Role / Timing Role: Low-power host managing sensor acquisition, local decision logic (e.g., threshold alarms), and LoRaWAN/Bluetooth LE packet transmission. Use Value: 0.43 µA Stop mode with 16 wakeup lines allows multiple sensor interrupts without leakage penalty; USB interface enables field calibration and firmware recovery without dedicated programmer. | Use Scenario: Wall-mounted occupancy/vacancy detector using PIR + ambient light sensing, controlling lighting and HVAC via DALI or 0–10 V interfaces. IC Role / Device Role / Timing Role: Real-time coordinator handling analog light/PIR signal processing, PWM dimming control, and scheduled occupancy reporting via wired Ethernet or wireless gateway. Use Value: Two ultra-low-power comparators operate in Standby mode to detect motion/light changes; 11 timers provide precise PWM generation and RTC-synchronized reporting windows. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar ultra-low-power microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM32L073RBT6 | LQFP64 package (64-pin), 192 KB Flash, same peripherals but adds CAN 2.0B interface and higher GPIO count (51) | Required where CAN bus integration or expanded I/O for multi-sensor fusion is needed | Select when board layout accommodates larger package and CAN protocol support is mandatory for industrial fieldbus compatibility. |
| STM32L053R8T6 | Same UFQFPN32 package, but reduced resources: 64 KB Flash, 8 KB SRAM, no USB, single DAC, no capacitive touch controller | Suitable for simpler sensor endpoints where USB connectivity and analog richness are not required | Choose for cost-sensitive, lower-complexity designs where USB, dual DAC, or TSC are unnecessary - saves ~30% BOM cost. |
Compared with STM32L073RBT6, the STM32L072KBU7TR trades CAN and pin count for smaller footprint and lower static power; versus STM32L053R8T6, it adds USB, dual DAC, and TSC at modest cost premium-making it optimal for compact, feature-rich edge nodes demanding analog versatility and direct PC connectivity.
Availability
STM32L072KBU7TR is available at Aetrix Electronics and suitable for smart utility meters, wearable health monitors, industrial wireless sensor nodes, and smart building occupancy controllers requiring stable component supply across extended product lifecycles.
Supply support for STM32L072KBU7TR 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 ICs, sensors, and analog components for industrial, automotive, and consumer markets.
The STM32L0 series targets ultra-low-power embedded applications, emphasizing energy efficiency, integrated analog functionality, and secure firmware execution-designed specifically for battery-operated and energy-harvesting IoT endpoints.
FAQ
What is the maximum operating frequency and core type of the STM32L072KBU7TR?
The STM32L072KBU7TR uses an Arm Cortex-M0+ core rated for up to 32 MHz operation, delivering 0.95 DMIPS/MHz. Its maximum frequency is constrained by supply voltage and temperature: 32 MHz is supported at 3.0–3.6 V and ≤85 °C, while 24 MHz applies at 1.65–1.8 V. Dynamic voltage scaling adjusts core voltage to maintain stability across operating ranges.
Does the STM32L072KBU7TR support USB without an external crystal?
Yes-the device integrates a factory-trimmed 48 MHz HSI48 oscillator with automatic calibration using USB Start-of-Frame (SOF) tokens, achieving ±0.25% accuracy. This eliminates the need for an external 48 MHz crystal or oscillator, reducing BOM cost and PCB area while maintaining full USB 2.0 full-speed compliance.
How many analog-to-digital converter (ADC) channels does the STM32L072KBU7TR support, and what is its resolution and speed?
The STM32L072KBU7TR features a single 12-bit ADC with up to 16 input channels (multiplexed across GPIOs), capable of 1.14 Msps sampling rate at full resolution. At lower speeds (e.g., 10 ksps), it consumes only 41 µA-optimized for high-precision, low-power sensor acquisition in battery-constrained applications.
What are the key low-power modes and their typical current consumption values?
The device offers three primary low-power modes: Standby (0.29 µA with 3 wakeup pins), Stop (0.43 µA with 16 wakeup lines), and Stop + RTC + 20 KB RAM retention (0.86 µA). All retain SRAM and register content; Standby disables voltage regulator for lowest leakage, while Stop maintains regulator for faster wake-up (5 µs from Flash).
STM32L072KBU7TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-UFQFN Exposed Pad
- 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, USB
- Peripherals:
- Brown-out Detect/Reset, DMA, POR, PWM, WDT
- Number of I/O:
- 25
- 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 10x12b; D/A 2x12b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM32L072KBU7TR FAQ
1.How can I place an order for STM32L072KBU7TR through Aetrix?
Please submit a Request for Quotation (RFQ) for STM32L072KBU7TR 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 STM32L072KBU7TR reliable?
The price and inventory of STM32L072KBU7TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM32L072KBU7TR is usually 5 days.
3.What payment methods are accepted for STM32L072KBU7TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM32L072KBU7TR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM32L072KBU7TR?
STM32L072KBU7TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM32L072KBU7TR 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 STM32L072KBU7TR?
For technical support, including STM32L072KBU7TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM32L072KBU7TR requirements.
6.How does Aetrix verify that STM32L072KBU7TR is sourced from the original manufacturer or authorized distributors?
All STM32L072KBU7TR 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 STM32L072KBU7TR meets industry standards.
7.What is the process for return or replacement of STM32L072KBU7TR?
All STM32L072KBU7TR units undergo pre-shipment inspection (PSI). If there is an issue with STM32L072KBU7TR, 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 STM32L072KBU7TR part is unused and in its original packaging.
Return procedure for STM32L072KBU7TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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