STM32L072KBU6 - 32MHz Cortex-M0+ USB MCU | STMicroelectronics
Référence : STM32L072KBU6 ✓ ActifSTM32L072KBU6 Présentation
An ultra-low-power microcontroller is an integrated semiconductor that executes embedded software while minimizing energy consumption during active operation and low-power standby. The STM32L0 product family belongs to the broader hierarchy of 32-bit microcontrollers, embedded processors, and semiconductor devices. Its low-power-oriented architecture makes it suitable for systems that must operate from limited energy budgets while still supporting firmware updates, data acquisition, communications, and real-time control.
Key features include a 32 MHz Arm Cortex-M0+ core, 128 KB of Flash, and 20 KB of SRAM. The analog subsystem provides one 12-bit ADC with hardware oversampling, two DAC channels, and two ultra-low-power comparators. Timing and supervisory resources include four general-purpose 16-bit timers, two basic timers, one low-power timer, one RTC, one SysTick timebase, and two watchdogs. USB 2.0 crystal-less connectivity simplifies designs that need USB device communication without a separate crystal.
The STM32L072xx architecture integrates connectivity and analog functions on a single low-power MCU. Hardware oversampling improves ADC data acquisition by processing multiple conversion samples internally, while the RTC and low-power timer support periodic events that can wake the system. The independent and window watchdog functions help detect lockups and unexpected operating conditions. Crystal-less USB operation can reduce board-level component requirements, although firmware, oscillator configuration, and signal-integrity validation remain essential.
Typical applications include USB-connected sensor nodes, compact industrial data loggers, wearable accessories, battery-powered measurement instruments, low-power control panels, and USB-to-serial or configuration adapters. The 32-pin 5 mm by 5 mm package supports space-constrained products, while the combination of USB, ADC, DAC, comparators, timers, and RTC reduces the number of separate discrete components required in a typical control or measurement design.
Designers should verify supply-voltage limits, USB transceiver requirements, clocking, and low-power mode transitions against the manufacturer datasheet before layout release. Place decoupling capacitors close to the supply pins, maintain the required USB data-routing geometry, and confirm exposed-pad soldering and thermal conditions. Firmware should also exercise watchdog, reset, and sleep-mode behavior because low-power system correctness depends on both electrical design and peripheral configuration.
This page consolidates the manufacturer device specifications with application guidance, strict same-package alternatives, and design-oriented comparisons. It is intended to help engineers evaluate STM32L072KBU6 for low-power embedded designs without overlooking USB connectivity, analog-resource constraints, memory requirements, or package-level implementation details.
Alternatives de remplacement direct pour STM32L072KBU6 — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec STM32L072KBU6 (même facteur de forme et même empreinte) — différant par CPU Core, Flash Memory, Package, USB Interface.
STM32L081KBU6
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
STM32L082KBU6
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
STM32L083KBU6
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
STM32L072KBU6 Valeurs maximales et caractéristiques électriques
| CPU Core | Arm Cortex-M0+, 32-bit |
| Maximum CPU Frequency | 32 MHz |
| Flash Memory | 128 KB |
| SRAM | 20 KB |
| USB Interface | 1 USB 2.0 device interface |
| ADC Resolution | 12-bit |
| ADC Oversampling | Supported hardware oversampling |
| DAC Channels | 2 channels |
| Ultra-Low-Power Comparators | 2 comparators |
| General-Purpose Timers | 4 timers, 16-bit |
| Basic Timers | 2 timers |
| Low-Power Timer | 1 LPTIM |
| Real-Time Clock | 1 RTC |
| Watchdogs | 2 watchdogs |
| Boîtier | 32-pin UFQFPN, 5 mm x 5 mm |
| Type de montage | Surface mount |
Configuration des broches de STM32L072KBU6
| Broche 1 | VBAT — Backup battery supply input |
| Broche 2 | PC14 — General-purpose input/output or tamper detection pin |
| Broche 3 | PC15 — General-purpose input/output or tamper detection pin |
| Broche 4 | NRST — Active-low reset input |
| Broche 5 | VSSA — Analog ground and negative analog reference connection |
| Broche 6 | VDDA — Analog supply and positive analog reference connection |
| Broche 7 | PA0 — General-purpose input/output and ADC input |
| Broche 8 | PA1 — General-purpose input/output and ADC input |
| Broche 9 | PA2 — General-purpose input/output and ADC input |
| Broche 10 | PA3 — General-purpose input/output and ADC input |
| Broche 11 | PA4 — General-purpose input/output and DAC output |
| Broche 12 | PA5 — General-purpose input/output and comparator input |
| Broche 13 | PA6 — General-purpose input/output and comparator input |
| Broche 14 | PA7 — General-purpose input/output and ADC input |
| Broche 15 | PB0 — General-purpose input/output and ADC input |
| Broche 16 | PB1 — General-purpose input/output and ADC input |
| Broche 17 | VSS_1 — Digital ground connection |
| Broche 18 | VDD_1 — Digital supply connection |
| Broche 19 | PA8 — General-purpose input/output |
| Broche 20 | PA9 — General-purpose input/output and USART transmission pin |
| Broche 21 | PA10 — General-purpose input/output and USART reception pin |
| Broche 22 | PA11 — USB negative data and general-purpose input/output pin |
| Broche 23 | PA12 — USB positive data and general-purpose input/output pin |
| Broche 24 | PA13 — Serial wire debugging programming input/output pin |
| Broche 25 | PA14 — Serial wire debugging clock pin |
| Broche 26 | PB3 — Serial wire debugging programming input/output pin |
| Broche 27 | PB4 — General-purpose input/output and timer pin |
| Broche 28 | PB5 — General-purpose input/output and timer pin |
| Broche 29 | PB6 — General-purpose input/output, timer, and USB input/output pin |
| Broche 30 | PB7 — General-purpose input/output and timer pin |
| Broche 31 | VSS_2 — Digital ground connection |
| Broche 32 | VDD_2 — Digital supply connection |
Applications typiques
STM32L072KBU6 convient pour 6 applications: USB-connected Sensor Node, Battery-Powered Data Logger, USB-to-Serial Configuration Adapter, Industrial Control Panel, Wearable Accessory, Precision Measurement Instrument.
USB-connected Sensor Node
The STM32L072KBU6 fits a USB-connected sensor node because it combines a 32 MHz Arm Cortex-M0+ core with USB 2.0 connectivity and a 12-bit ADC with hardware oversampling. The MCU can acquire analog sensor data, apply filtering and calibration, and expose results through a USB interface without requiring a separate USB controller. Its 128 KB of Flash supports embedded firmware, while 20 KB of SRAM provides working memory for buffers and protocol handling. Crystal-less USB operation can reduce external clock components, although the layout must preserve controlled USB trace geometry and the firmware must configure the clock system correctly for reliable enumeration and data transfer.
Recommandé
Battery-Powered Data Logger
The STM32L072KBU6 is suitable for a battery-powered data logger that must balance processing capability with low standby consumption. Its low-power STM32L0 architecture includes an RTC, one low-power timer, two ultra-low-power comparators, and two watchdogs, allowing scheduled wake-ups and autonomous monitoring. The 128 KB Flash stores firmware, calibration tables, and compact event logs, while the 12-bit ADC acquires sensor data. Two DAC channels can generate test or control signals where needed. Design the sleep-state current around the actual operating profile, and verify wake sources and timer settings because firmware configuration directly affects the achievable battery life.
Recommandé
USB-to-Serial Configuration Adapter
The STM32L072KBU6 can implement a compact USB-to-serial configuration adapter by using its USB device interface for communication with a host and its USART peripherals for connection to an external target. The 32 MHz Cortex-M0+ core provides enough performance for protocol conversion, command parsing, and basic diagnostics, while 128 KB of Flash supports application firmware and interface descriptors. USB crystal-less operation can simplify the board, but the host-driver, enumeration, and suspend behavior must be validated together. A 5 mm by 5 mm 32-pin UFQFPN package also supports compact dongle formats where connector clearance and exposed-pad assembly permit.
Recommandé
Industrial Control Panel
The STM32L072KBU6 suits an industrial control panel that combines local logic, analog monitoring, and service connectivity. Four general-purpose 16-bit timers, two basic timers, one LPTIM, and one RTC provide resources for motor timing, debouncing, periodic maintenance, and time-based events. The two DAC channels support analog setpoints, while the ADC and comparators can monitor process signals and fault thresholds. USB connectivity can simplify configuration or diagnostic access from a service laptop. In an industrial enclosure, validate temperature limits, supply tolerances, ESD protection, grounding, and isolation requirements rather than assuming that a compact MCU package alone satisfies the final system requirements.
Recommandé
Wearable Accessory
The STM32L072KBU6 is appropriate for a wearable accessory requiring USB connectivity, analog sensing, and low-power operation in a compact package. Its 32-pin UFQFPN footprint measures 5 mm by 5 mm, while the Cortex-M0+ core provides efficient control without requiring a higher-power application processor. The 12-bit ADC supports body or environmental sensing, two comparators can detect thresholds, and the RTC maintains timekeeping. The 20 KB SRAM limits complex buffering or graphical workloads, so design firmware around local processing and compact data transfer. Use the manufacturer low-power guidance to choose retention states, wake conditions, and peripheral shutdown sequences for the target battery budget.
Recommandé
Precision Measurement Instrument
The STM32L072KBU6 supports compact precision measurement instruments that combine data acquisition with digital control. The 12-bit ADC with hardware oversampling improves effective conversion quality by aggregating multiple samples, while the two DAC channels support excitation, calibration, or signal references. Four 16-bit general-purpose timers provide accurate sampling and output timing, and the two watchdogs add supervision for unattended operation. USB connectivity enables result export, configuration, and firmware updates from a host computer. For laboratory-grade accuracy, characterize offset, gain, noise, reference stability, and analog-layout effects in the completed instrument; the nominal ADC resolution alone does not establish total measurement uncertainty.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour STM32L072KBU6 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | STM32L081KBU6 | STM32L082KBU6 | STM32L083KBU6 |
|---|---|---|---|---|
| Package | 32-pin UFQFPN (5x5 mm) | 32-pin UFQFPN (5x5 mm) | 32-pin UFQFPN (5x5 mm) | 32-pin UFQFPN (5x5 mm) |
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| CPU Core | Arm Cortex-M0+, 32-bit | Arm Cortex-M0+, 32-bit | Arm Cortex-M0+, 32-bit | Arm Cortex-M0+, 32-bit |
| Maximum CPU Frequency | 32 MHz | 32 MHz | 32 MHz | 32 MHz |
| Flash Memory | 128 KB | 128 KB | 128 KB | 128 KB |
| USB Interface | USB 2.0 device interface | USB 2.0 device interface | USB 2.0 device interface | USB 2.0 device interface |
Principaux différenciateurs
- Provides the baseline STM32L0 feature mix without expanded grade resources (vs STM32L081KBU6)
- Balances 128 KB of Flash with 20 KB of SRAM for compact embedded designs (vs STM32L082KBU6)
- Combines USB connectivity with a full 12-bit analog conversion subsystem (vs STM32L083KBU6)
Notes de conception
Follow the STMicroelectronics UFQFPN land pattern and place the required input, output, and analog-supply bypass capacitors directly beside their associated pins. Keep the VDDA and VSSA return path short and quiet, and connect the exposed pad according to the manufacturer package drawing and assembly guidance. Estimated thermal and assembly conditions cannot be finalized without the PCB copper area, airflow, and solder process, so validate those variables during prototype testing.
Route the USB D+ and D- pair as a controlled, impedance-matched differential pair with a continuous return path and minimal stubs. Keep switching regulators, crystals when used, high-current outputs, and analog sources away from the USB and ADC traces. Because the family supports crystal-less USB, clock configuration must be validated by measuring enumeration behavior and eye timing rather than assuming that removing a crystal removes all RF or sensitivity concerns.
Do not treat an STM32L0 family member as a source-identical replacement merely because the package matches. Review startup behavior, clock limits, low-power transitions, SRAM, USB implementation, security peripherals, watchdog topology, and every pin's analog or alternate-function use. Firmware should also be rebuilt and tested against the selected device's peripheral definitions, especially when moving from STM32L072KBU6 to STM32L081KBU6, STM32L082KBU6, or STM32L083KBU6.
Map the device's active, sleep, stop, and standby behavior to the actual product duty cycle. The ADC, comparators, timers, USB PHY, and flash activity can prevent the nominal low-power benefit if they remain enabled or if the firmware wakes frequently. Measure current at the finished board level, validate each wake source, and use the RTC or LPTIM for scheduled events instead of continuous polling when the application permits.
Informations de conformité
The manufacturer product page and datasheet should be consulted for the current declarations and qualification status. No specific compliance declaration is asserted on this page.
