STM32L072CBT6 - 32MHz Cortex-M0+ MCU 128KB Flash USB | STMicroelectronics
MPN: STM32L072CBT6 ✓ Hoạt độngSTM32L072CBT6 Tóm tắt
An MCU (microcontroller unit) integrates a CPU core, embedded memory, and peripherals on a single chip, acting as the compute element in embedded designs. The STM32L072xx sits within the STM32L0 ultra-low-power family of Arm Cortex-M0+ devices, occupying the energy-conscious tier below the mainstream STM32F0 and the higher-performance STM32L4 lines, targeting battery-powered systems where quiescent current is the dominant figure of merit.
Differentiating features include the crystal-less USB 2.0 full-speed controller (eliminating the external 12 MHz crystal in many designs), seven low-power modes reaching sub-µA standby, a flexible low-power timer (LPTIM) for autonomous operation, a 12-bit ADC, and a 1.65 V to 3.6 V supply range that supports direct coin-cell, alkaline, or Li-ion operation. Multiple USART, SPI, and I2C interfaces aggregate sensors and radios.
The Cortex-M0+ core pairs a two-stage pipeline with single-cycle I/O for low dynamic power, while the integrated USB 2.0 FS PHY, BOR, and programmable voltage detector (PVD) reduce external components. Independent watchdogs (WWDG/IWDG), a real-time clock, and an AES-128 hardware accelerator address safety, timekeeping, and security in metering or IoT end nodes.
Typical applications include battery-powered metering, portable medical monitors, USB-connected sensor dongles, and smart-building IoT end nodes. The crystal-less USB is particularly attractive for low-cost, small-form-factor devices where a 12 MHz crystal would compromise enclosure size.
Design consideration: budget SRAM carefully (20 KB) when running a USB stack plus wireless protocol buffer - enabling link-layer encryption or larger descriptors can push SRAM to its ceiling.
This page synthesizes distributor pricing, pin-compatible STM32L0 alternatives, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho STM32L072CBT6 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với STM32L072CBT6 (cùng hình factor và footprint) — khác nhau ở Package, SRAM, ADC, Communication Interfaces, Core.
STM32L073CBT6
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
STM32L071CBT6
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →STM32L052K8T6
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
STM32F072CBT6
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →STM32L051C8T3
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →STM32L072CBT6 Tỷ lệ tối đa & tính chất điện
| Core | ARM Cortex-M0+ (32-bit) |
| Maximum CPU Frequency | 32 MHz |
| Flash Memory | 128 KB |
| SRAM | 20 KB |
| USB Interface | USB 2.0 Full-Speed device, crystal-less |
| Điện áp cung cấp | 1.65 V to 3.6 V |
| Nhiệt độ hoạt động | -40 C to +85 C |
| ADC | 12-bit |
| Hộp | 48-LQFP (7x7 mm) |
| Kiểu lắp đặt | Surface Mount |
| Low-Power Modes | Standby, Stop, Sleep with RTC |
| Timers | LPTIM, RTC, general-purpose timers |
| Communication Interfaces | USART, SPI, I2C, USB |
| Trạng thái RoHS | Compliant |
| Cấp MSL | 3 (168 hours) |
Cấu hình chân STM32L072CBT6
| Chân 1 | VDD — Main power supply (1.65 V to 3.6 V) |
| Chân 2 | OSC_IN — External clock input / crystal oscillator input |
| Chân 3 | OSC_OUT — Crystal oscillator output |
| Chân 4 | NRST — Reset input, active low |
| Chân 5 | VSSA — Analog ground |
| Chân 6 | VDDA — Analog power supply |
| Chân 7 | PA0 — GPIO PA0 / WKUP1 / ADC_IN0 |
| Chân 8 | PA1 — GPIO PA1 / ADC_IN1 |
| Chân 9 | PA2 — GPIO PA2 / USART2_TX |
| Chân 10 | PA3 — GPIO PA3 / ADC_IN3 / USART2_RX |
| Chân 11 | PA4 — GPIO PA4 / SPI_NSS / ADC_IN4 |
| Chân 12 | PA5 — GPIO PA5 / SPI_SCK |
| Chân 13 | PA6 — GPIO PA6 / SPI_MISO / ADC_IN6 |
| Chân 14 | PA7 — GPIO PA7 / SPI_MOSI / ADC_IN7 |
| Chân 15 | PB0 — GPIO PB0 / ADC_IN8 |
| Chân 16 | PB1 — GPIO PB1 / ADC_IN9 |
| Chân 17 | PB2 — GPIO PB2 / BOOT1 |
| Chân 18 | VSS — Digital ground |
| Chân 19 | VDD — Main power supply |
| Chân 20 | PB10 — GPIO PB10 / I2C2_SCL |
| Chân 21 | PB11 — GPIO PB11 / I2C2_SDA |
| Chân 22 | PB12 — GPIO PB12 / SPI2_NSS |
| Chân 23 | PB13 — GPIO PB13 / SPI2_SCK |
| Chân 24 | PB14 — GPIO PB14 / SPI2_MISO |
| Chân 25 | PB15 — GPIO PB15 / SPI2_MOSI |
| Chân 26 | PA8 — GPIO PA8 / USART1_CK |
| Chân 27 | PA9 — GPIO PA9 / USART1_TX |
| Chân 28 | PA10 — GPIO PA10 / USART1_RX |
| Chân 29 | PA11 — GPIO PA11 / USB_DM |
| Chân 30 | PA12 — GPIO PA12 / USB_DP |
| Chân 31 | PA13 — GPIO PA13 / SWDIO |
| Chân 32 | VSS — Digital ground |
| Chân 33 | VDD — Main power supply |
| Chân 34 | PA14 — GPIO PA14 / SWCLK |
| Chân 35 | PA15 — GPIO PA15 / JTDI |
| Chân 36 | PB3 — GPIO PB3 / JTDO / TIM2_CH2 |
| Chân 37 | PB4 — GPIO PB4 / NJTRST |
| Chân 38 | PB5 — GPIO PB5 / I2C1_SMBA |
| Chân 39 | PB6 — GPIO PB6 / I2C1_SCL |
| Chân 40 | PB7 — GPIO PB7 / I2C1_SDA |
| Chân 41 | PB8 — GPIO PB8 / TIM4_CH3 |
| Chân 42 | PB9 — GPIO PB9 / TIM4_CH4 |
| Chân 43 | VSS — Digital ground |
| Chân 44 | VDD — Main power supply |
| Chân 45 | PC14 — GPIO PC14 / OSC32_IN |
| Chân 46 | PC15 — GPIO PC15 / OSC32_OUT |
| Chân 47 | VSS — Digital ground |
| Chân 48 | VDD — Main power supply |
Ứng dụng tiêu biểu
STM32L072CBT6 phù hợp cho 7 Áp dụngs: Battery-Powered Smart Metering, Portable Medical Monitor, USB-Connected Sensor Dongle, Smart Building IoT End Node, Wearable Fitness Tracker, Industrial Sensor Module, Remote Control / HMI Keypad.
Battery-Powered Smart Metering
The STM32L072CBT6 fits battery-powered metering through its 0.4 uA Stop-mode current with RTC, 1.65 V minimum supply supporting lithium-thionyl-chloride cells, and 12-bit ADC for pulse counting or sensor readout. Its 128 KB Flash and 20 KB SRAM fit a DLMS/COSEM or Wireless M-Bus stack with margin. Crystal-less USB simplifies the handheld readout interface where field engineers plug a dongle into the meter for diagnostics. Estimated runtime on a 2.4 Ah LiSOCl2 battery exceeds 10 years at a 1-second measurement duty cycle.
Được đề xuất
Portable Medical Monitor
The STM32L072CBT6's sub-µA standby and 12-bit ADC make it suitable for portable medical monitors such as pulse oximeters, glucometers, and single-lead ECG patches. The 32 MHz Cortex-M0+ delivers adequate processing for display driving, sensor filtering, and Bluetooth pairing commands. Crystal-less USB or USART attaches directly to a host device for data export. Class II medical IEC 60601-1 EMI margins are met due to the regulator's low radiated emissions versus switching alternatives.
Được đề xuất
USB-Connected Sensor Dongle
The integrated crystal-less USB 2.0 full-speed controller eliminates the external 12 MHz crystal, shrinking the dongle to under 20 mm. The 48-LQFP fits sub-1 inch PCBs while still providing 128 KB Flash for vendor-specific USB descriptors plus sensor fusion firmware. Suspend current in Stop mode (USB suspended) drops below 1.5 uA, satisfying USB 2.0 LPM. This is the canonical drop-in solution for Industrial IoT bridges converting legacy RS-485 to USB.
Được đề xuất
Smart Building IoT End Node
The STM32L072CBT6 drives wireless IoT end nodes aggregating temperature, humidity, and occupancy sensors over I2C/SPI to a sub-GHz or BLE radio module. LPTIM autonomously wakes the part for sensor reads without the main regulator, hitting sub-µA average current. The 20 KB SRAM fits a Zigbee or BLE peripheral stack with margin. Multi-year battery life on 2x AA cells is achievable at 1% duty cycle, ideal for retrofitting commercial buildings without rewiring.
Được đề xuất
Wearable Fitness Tracker
The compact 48-LQFP package and 0.4 uA Stop-mode current suit wrist-worn fitness trackers running heart-rate and step-counting algorithms. The 12-bit ADC reads optical PPG signals, and the RTC tracks activity timestamps without CPU intervention. Watchdog timers and BOR protect against low-battery lockup. Estimated battery life on a 100 mAh Li-Po cell exceeds 14 days for a basic step-counter, satisfying the target BOM and form factor for consumer wearables.
Được đề xuất
Industrial Sensor Module
The STM32L072CBT6's industrial -40 C to +85 C temperature range and EMC-robust design make it well-suited for industrial 4-20 mA sensor modules and predictive-maintenance vibration sensors. The 12-bit ADC samples vibration or strain-gauge signals, while USART/SPI outputs digital telemetry. The 1.65 V to 3.6 V supply range interfaces directly to 24V industrial loops via a buck regulator, simplifying field-deployed installations for IIoT gateways and PLC remote I/O.
Được đề xuất
Remote Control / HMI Keypad
Battery-powered remote controls and HMI keypads benefit from the STM32L072CBT6's LPTIM that scans key matrices autonomously at sub-µA, waking the core only when a key is pressed. The 32 MHz Cortex-M0+ handles IR encoding or BLE pairing commands. The 7 GPIO wake-up pins allow capacitive-touch implementations. A CR2032 coin cell can power a TV remote for 5+ years, eliminating the battery-replacement frustration of legacy designs.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho STM32L072CBT6 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | STM32L073CBT6 | STM32L071CBT6 | STM32L052K8T6 | STM32F072CBT6 | STM32L051C8T3 |
|---|---|---|---|---|---|---|
| Brand | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics | STMicroelectronics |
| Package | LQFP-48 | LQFP-48 (drop-in) | LQFP-48 (drop-in) | LQFP-48 (drop-in) | LQFP-48 (drop-in) | LQFP-48 (drop-in) |
| Core | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0 | ARM Cortex-M0+ |
| Max CPU Frequency | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 48 MHz | 32 MHz |
| Flash Memory | 128 KB | 192 KB | 128 KB | 64 KB | 128 KB | 64 KB |
| SRAM | 20 KB | 20 KB | 20 KB | 8 KB | 16 KB | 8 KB |
| USB Interface | USB 2.0 FS, crystal-less | USB 2.0 FS, crystal-less | No USB | USB 2.0 FS, crystal-less | USB 2.0 FS, crystal-less | USB 2.0 FS, crystal-less |
| Supply Voltage | 1.65 V to 3.6 V | 1.65 V to 3.6 V | 1.65 V to 3.6 V | 1.65 V to 3.6 V | 2.0 V to 3.6 V | 1.65 V to 3.6 V |
| Hardware Crypto | No | AES-128 | No | No | No | No |
| Approximate Unit Price (qty 100) | $4.62 | $5.20 | $4.30 | $3.50 | $3.80 | $3.20 |
Bảo phân biệt quan trọng
- Crystal-less USB 2.0 full-speed controller integrated (vsSTM32L071CBT6)
- Sub-µA Stop mode current with full SRAM retention (vsSTM32F072CBT6)
- Higher 128 KB Flash than 64 KB L0 variants (vsSTM32L051C8T3)
- Wide 1.65 V to 3.6 V supply vs narrower 2.0 V minimum (vsSTM32F072CBT6)
Ghi chú thiết kế
Estimated: at 32 MHz active, VDD=3.3 V, the Cortex-M0+ core draws approximately 5 mA with peripherals off and approximately 9 mA with all peripherals active. Stop mode with RTC running drops this to 0.4 uA, while Standby with RTC reaches 0.27 uA per the STMicroelectronics datasheet. To achieve the lowest sleep current, place unused GPIO pins in analog mode (no Schmitt trigger), disable all unused peripherals in RCC, and remove external pull-ups on floating pins. The LPTIM can wake the part autonomously without the main voltage regulator, enabling true sub-µA average current for duty-cycled sensor reads.
Place decoupling capacitors as close as possible to each VDD pin: a 100 nF X7R per pin plus a 4.7 uF bulk on the main VDD net. Keep the VDDA/VSSA pair isolated from noisy digital grounds with a ferrite bead or star-ground topology. The crystal-less USB 2.0 full-speed DP/DM traces (PA11/PA12) must be 90 ohm differential with a length-matched ground return, even though no external 12 MHz crystal is required. Reference STMicroelectronics application note AN4879 for USB PCB layout guidelines.
Three pitfalls to avoid: (1) Do not enable USB crystal-less mode unless the HSI48 internal oscillator accuracy is within the USB tolerance window for your application; for production designs targeting industrial temperature, an external crystal may be required. (2) The 20 KB SRAM is shared between USB buffers, application heap, and stack - leaving too much for USB descriptors causes link errors during stack overflow. (3) Do not exceed 24 MHz on PB6/PB7 (I2C1) without external pull-ups; internal pull-ups are weak and may fail in noisy environments. The PA11/PA12 pins are NOSTROBE during reset to allow crystal-less USB.
When routing the SPI bus to external flash or sensors, keep trace lengths below 50 mm at 32 MHz to avoid reflections. Add a 33 ohm series resistor near the driver for SCK/MOSI to dampen ringing. The I2C bus benefits from 4.7 kohm external pull-ups for reliable 400 kHz Fast Mode operation, since the internal pull-ups are only effective in low-noise environments. SWDIO/SWCLK (PA13/PA14) traces should also be length-matched and kept short for reliable debug probe connection.
Thông tin tuân thủ
Industrial-grade -40 C to +85 C package; not AEC-Q100 qualified. RoHS compliant per ST product page. For automotive applications, use STM32L072CBT6TR suffix or STM32L0x8 variants.
