Item specifics
Description
STM32L071CBT6 Product Overview
STM32L071CBT6 is a Cortex-M0+ MCU at 32 MHz, LQFP-48. 128 KB Flash, 20 KB SRAM, 6 KB EEPROM, USB 2.0 FS device (crystal-less), 12-bit ADC (16 ch), 12-bit DAC, two comparators, capacitive touch channels, LP timers, RTC, 2×USART, 1×UART, 2×SPI, 2×I2C. Up to 41 x 5 V-tolerant I/Os. 1.65–3.6 V, -40–85 °C. Compared to the STM32L051 series, it doubles the Flash to 128 KB, increases SRAM to 20 KB, and adds a DAC and comparators, delivering stronger performance for battery-powered IoT nodes and portable devices needing richer storage, analog features, and USB communication.
STM32L071CBT6 Core Features
Core: Cortex-M0+ 32 MHz, low-power design
Memory: 128 KB Flash, 20 KB SRAM, 6 KB EEPROM
USB: USB 2.0 FS device (crystal-less)
Analog: 12-bit ADC (16 ch), 12-bit DAC, 2×Comparators, capacitive touch
Connectivity: 2×USART, 1×UART, 2×SPI, 2×I2C
Timers: LP Timer, GP Timers, RTC
I/Os: 41 (5 V-tolerant)
Package: LQFP-48
Temperature Range: -40°C to 85°C
STM32L071CBT6 Applications
IoT Sensor Nodes: Battery-powered wireless sensors, USB data acquisition modules
Portable Devices: Wearables, portable medical devices, USB peripherals
Industrial Metering: Water, gas, and electricity meters
Consumer Electronics: Remote controls, e-labels, smart cards
Energy Harvesting Applications: Self-powered sensor nodes
STM32L071CBT6 Key Advantages
128 KB Flash + 20 KB SRAM + 6 KB EEPROM: Massive memory for complex programs and data logging
USB + DAC + Comparators: Crystal-less USB, analog output, and comparators — comprehensive feature set
Capacitive Touch Sensing: Built-in touch channels for easy button and slider implementation
Ultra-Low Power: Multiple low-power modes extend battery life
5 V-tolerant I/Os: Enhanced robustness, simplified level shifting
Full Ecosystem Compatibility: Easy development with STM32CubeIDE/HAL/LL libraries
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FAQ
1. What is STM32L071CBT6 and where does it fit in the STM32L0 series?
STM32L071CBT6 is an ultra-low-power 32-bit MCU from STMicroelectronics' STM32L0 series, built around an Arm® Cortex®‑M0+ core in an LQFP‑48 package (7 mm × 7 mm). Operating at 32 MHz, it provides 128 KB Flash and 20 KB SRAM, along with a USB 2.0 full‑speed device controller and a 12‑bit ADC. As a compact, hand‑solder‑friendly member of the L071 family, it omits the segment LCD driver, DAC, and capacitive touch sensing (TSC) to focus on delivering powerful ultra‑low‑power processing, USB connectivity, and analog acquisition at a highly competitive cost—ideal for PCB‑area‑sensitive, battery‑powered devices that do not require a complex user interface.
2. What are the key specifications of STM32L071CBT6?
Core: Arm® Cortex®‑M0+, up to 32 MHz
Memory: 128 KB Flash, 20 KB SRAM
Operating Voltage: 1.65 V to 3.6 V
Temperature Range: -40 °C to +85 °C (industrial grade)
I/O Count: up to 37
Package: LQFP‑48 (7 mm × 7 mm)
3. Is the LQFP‑48 package easy to solder? Is it suitable for low‑volume hand assembly?
Very easy. The LQFP‑48 has all pins exposed with a 0.5 mm pitch, allowing drag‑soldering with a standard iron and flux—no hot‑air station required. This greatly lowers the barrier for prototyping and small‑batch production, making it an excellent choice for hobbyists, makers, and small teams. The 7 mm × 7 mm size also balances compactness with comfortable manual handling.
4. How does STM32L071CBT6 differ from STM32L071RBT6? How should I choose based on package and I/O needs?
Both share identical cores, Flash, SRAM, and peripherals—USB and ADC are present, while segment LCD, DAC, and touch sensing are absent. The only differences are the package and I/O count: CBT6 uses an LQFP‑48 with 37 I/Os, while RBT6 uses an LQFP‑64 with 51 I/Os. If your application needs no more than 37 I/Os and values a smaller PCB footprint, the CBT6 delivers the same performance and features in a more compact form factor.
5. Why doesn't the STM32L071 series include a segment LCD, DAC, or touch sensing? How should I choose for my project?
This is a deliberate product differentiation: the L071 is the value‑line entry, keeping only USB and ADC to deliver ultra‑low‑power processing and communication at the lowest cost. The L072 adds a segment LCD driver for applications needing a segment display; the L073 further integrates a 12‑bit DAC and capacitive touch sensing (TSC). If your project does not need a segment display, analog output, or touch keys, the L071CBT6 provides powerful processing and USB connectivity at the most optimized budget.
6. What practical applications can the 128 KB Flash and 20 KB SRAM combination support? Will memory be a constraint?
The 128 KB Flash easily accommodates a lightweight RTOS (such as FreeRTOS), USB device stacks (CDC virtual COM port or HID), common sensor drivers, and communication middleware. The 20 KB SRAM is suitable for relatively fixed‑function applications like wireless sensor nodes, USB dongles, portable data loggers, and simple human‑interface devices. If additional RAM is required later, external PSRAM can be added via SPI, or you can migrate to the STM32L1 series with larger SRAM.
7. How does it perform in terms of power consumption? What are the typical currents across its modes?
Temperature Range: -40 °C to +85 °C
Ultra‑low‑power modes:
Standby mode: ~0.27 µA (no RTC)
Stop mode: ~0.4 µA (no RTC), ~0.8 µA with RTC
Run mode: ~88 µA/MHz
8. What can the USB 2.0 full‑speed device interface do, and why must an external crystal be used?
The USB controller can be configured as a CDC virtual COM port (for serial communication with a PC or smartphone), an HID keyboard/mouse, or an MSC mass storage device for data exchange, parameter configuration, and firmware updates. USB protocol demands extremely tight clock accuracy (≤0.25% tolerance), which the internal RC oscillator cannot meet. An external high‑precision 8 MHz or 16 MHz crystal is therefore mandatory; otherwise, the device will fail enumeration or experience unstable communication.
9. What development tools are needed for the STM32L071CBT6? Is there a compatible evaluation board?
ST provides free STM32CubeMX for graphical configuration and STM32CubeIDE as an integrated development environment, along with the STM32CubeL0 firmware library. Debugging and programming are handled by ST‑Link debuggers. For rapid prototyping, the NUCLEO‑L073RZ board (LQFP‑64) is highly compatible—though it carries an L073 chip, the L071 shares the same core architecture and USB/ADC peripherals, so code can be ported to the 48‑pin CBT6 with minimal adjustments.
10. If I later need more I/Os, a segment display, or analog output, what upgrade options are available?
If only more I/Os are needed, choose the LQFP‑64 L071RBT6 (51 I/Os). For a segment display, upgrade to the L072 series (e.g., L072CBT6 or L072RBT6); for both DAC and touch sensing, select the L073 series. In all these upgrade paths, core code is reusable—only pin configuration and peripheral parameters need adjustment in STM32CubeMX.