Product Overview
The STMicroelectronics STM32L072RBT6 is an ultra-low-power ARM Cortex-M0+ microcontroller from the STM32L0 series. Operating at up to 32 MHz, it features 128 KB Flash, 20 KB SRAM, 6 KB EEPROM, and a crystal-less USB 2.0 full-speed interface. Packaged in LQFP-64 with 51 I/O pins, it achieves 0.29 µA standby current and 93 µA/MHz run-mode current, making it ideal for battery-powered and energy-harvesting applications.
Key Specifications
| Core | ARM Cortex-M0+ (32-bit) |
| Max Frequency | 32 MHz |
| Flash Memory | 128 KB (dual-bank, ECC, Read-While-Write) |
| SRAM | 20 KB |
| EEPROM | 6 KB (with ECC) |
| I/O Pins | 51 (78 5V-tolerant in full device) |
| ADC | 12-bit, 1.14 MSPS, up to 16 channels |
| DAC | 2× 12-bit with output buffers |
| Comparators | 2× ultra-low-power (window mode) |
| Communication | 4× USART, 1× LPUART, 2× SPI, 1× I2S, 3× I2C |
| USB | 2.0 Full-Speed (crystal-less) |
| Touch Sensing | Up to 24 capacitive sensing channels |
| Supply Voltage | 1.65 V ~ 3.6 V |
| Package | LQFP-64 (10×10 mm) |
| Operating Temperature | -40°C ~ +85°C |
| Standby Current | 0.29 µA |
| Run Mode Current | 93 µA/MHz |
Features
- Ultra-low-power platform: 0.29 µA standby, 0.43 µA stop, 93 µA/MHz run
- Crystal-less USB 2.0 full-speed with battery charging detection and LPM
- 6 KB true data EEPROM with ECC for non-volatile parameter storage
- True Random Number Generator (RNG) and firewall protection
- Low-power UART (LPUART) for communication in Stop mode
- Gas and water metering with smart communication
- Industrial sensors and remote monitoring
- Healthcare and fitness wearable devices
- Smart home and building automation
- PC peripherals and gaming controllers
- Smart metering: Gas, water, and heat meters with ultra-long battery life and USB data download capability
- Industrial sensors: Battery-powered wireless sensor nodes with capacitive touch user interface
- Wearable health: Fitness trackers and medical monitoring devices requiring months of battery operation
- Smart home: Battery-powered door/window sensors, smart locks, and environmental monitors
- USB peripherals: Custom HID devices, data loggers, and PC accessories with crystal-less USB connectivity
Applications
The STM32L072RBT6 from STMicroelectronics is an ultra-low-power microcontroller from the STM32L0 series, based on the ARM Cortex-M0+ 32-bit RISC core operating at up to 32 MHz. The device incorporates high-speed embedded memories including 128 KB of dual-bank Flash with ECC and Read-While-Write capability, 20 KB of SRAM, and 6 KB of data EEPROM with ECC. A key differentiator is the integrated crystal-less USB 2.0 full-speed interface, which eliminates the need for an external crystal for USB operation. The STM32L072RBT6 achieves industry-leading low-power figures: 0.29 µA in Standby mode, 0.43 µA in Stop mode, and just 93 µA/MHz in Run mode. The rich analog peripheral set includes a 12-bit ADC at 1.14 MSPS, two 12-bit DACs, two ultra-low-power comparators, and up to 24 capacitive touch sensing channels.
The STM32L072RBT6 is built around the ARM Cortex-M0+ processor core, which implements the ARMv6-M architecture with a 2-stage pipeline and Thumb instruction set for efficient code density. The memory subsystem uses a modified Harvard architecture with separate instruction and data buses to the Flash and SRAM. The dual-bank Flash allows Read-While-Write operation, enabling firmware updates without halting application execution. The 6 KB true EEPROM with ECC provides reliable non-volatile storage for calibration data and configuration parameters without the wear-leveling complexity of Flash-based EEPROM emulation. The crystal-less USB uses an internal 48 MHz RC oscillator that is automatically calibrated against the USB frame timing (Start-of-Frame packets) to maintain the ±0.25% frequency accuracy required by the USB specification. The ultra-low-power design employs multiple techniques: clock gating for unused peripherals, voltage scaling, and specialized low-power peripherals (LPUART, LPTIM) that can operate in Stop mode while the CPU is sleeping.
| Pin | Name | Type | Function |
|---|---|---|---|
| 1-2 | VSS, VDD | Power | Ground and 3.3V digital supply |
| 3-4 | PA13, PA14 | Debug | SWDIO, SWCLK (Serial Wire Debug) |
| 5-12 | PA15, PB3-PB9 | I/O | Port A/B, JTAG, SPI1, I2C1, TIM2 |
| 13-18 | PC13-PC15, PD0-PD2 | I/O | Port C/D, OSC32, USART, TIM3 |
| 19-20 | VSS, VDD | Power | Additional ground and supply pins |
| 21-36 | PB10-PB15, PA0-PA7 | I/O | Port B/A, I2C2, USART, SPI, ADC, TIM |
| 37-38 | VSSA, VREF+ | Analog | Analog ground and ADC reference |
| 39-44 | PA8-PA12 | I/O | Port A, MCO, TIM1, I2C, USART1, USB DM/DP |
| 45-48 | VDDUSB, VSS, VDD, BOOT0 | Power/Ctrl | USB supply, digital supply, boot config |
| 49-64 | PB0-PB7, VDD, VSS | I/O/Power | Port B, ADC, TIM, LPUART, additional supply |
| Manufacturer | Part Number | Package | Notes |
|---|---|---|---|
| ST | STM32L073RBT6 | LQFP-64 | Same with LCD controller (up to 8×40 segments) |
| ST | STM32L072RZH6 | UFQFPN-48 | Smaller package (48-pin), fewer I/O |
| ST | STM32L082RBT6 | LQFP-64 | Higher Flash (192KB), same features |
| Silicon Labs | EFM32TG11B120F64GQ64 | QFP-64 | Gecko M0+, 48MHz, similar low-power |
| NXP | LPC824M201JHI33 | HVQFN-33 | M0+ at 30MHz, compact, no USB |
| Microchip | SAML21J18B-AUT | TQFP-64 | M0+ at 48MHz, ultra-low-power competitor |
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We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.
Service & Packaging
All electronic components we source from our partnered supply chains go through strict incoming inspections.Through careful testing, we ensure everything delivered to customers is genuine original parts and meets quality requirements.In addition, we keep complete inspection records to make the entire supply chain process clear and traceable.
Certification
We have obtained a number of professional certifications and built our own professional testing laboratory.This ensures that every product we deliver to our customers meets the highest quality requirements.We conduct tests in strict accordance with procedures to ensure stable product quality and accurate parameters.To guarantee genuine original parts, we also cooperate with reliable third-party testing institutions for strict quality inspection.We always attach great importance to quality and fully comply with industry standards, relevant regulations, and ISO 9001:2015 requirements.