Item specifics
Description
STM32L071RZT6 Product Overview
STM32L071RZT6 is a Cortex-M0+ MCU at 32 MHz, LQFP-64. 192 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 51 x 5 V-tolerant I/Os. 1.65–3.6 V, -40–85 °C. Compared to the STM32L071RBT6 (128 KB Flash), this model increases Flash to 192 KB, providing even larger program storage for battery-powered IoT nodes and portable devices requiring USB communication and rich analog features.
STM32L071RZT6 Core Features
Core: Cortex-M0+ 32 MHz, low-power design
Memory: 192 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: 51 (5 V-tolerant)
Package: LQFP-64
Temperature Range: -40°C to 85°C
STM32L071RZT6 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
STM32L071RZT6 Key Advantages
192 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
51 I/Os in LQFP-64 Package: Rich pins for multi-peripheral connectivity
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 STM32L071RZT6 and what does it focus on within the STM32L0 series?
STM32L071RZT6 is an ultra-low-power 32-bit MCU from STMicroelectronics' STM32L0 series, built around an Arm® Cortex®‑M0+ core in an LQFP‑64 package. Running at 32 MHz, it provides 192 KB Flash and 20 KB SRAM, and integrates a USB 2.0 full‑speed device controller and a 12‑bit ADC. As a cost‑optimized member of the L0 family, it omits the segment LCD driver and DAC to deliver outstanding energy efficiency, USB connectivity, and essential analog acquisition at a highly attractive price point, targeting battery‑powered devices that do not need a segment display or analog output.
2. What are the key specifications of STM32L071RZT6?
Core: Arm® Cortex®‑M0+, up to 32 MHz
Memory: 192 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 51
Package: LQFP‑64 (10 mm × 10 mm)
3. Why doesn't the STM32L071 have a segment LCD driver or DAC? How do I choose among the L071, L072, and L073?
This is a deliberate product differentiation within the STM32L0 family: 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 require a segment display, analog voltage output, or touch keys, the L071 provides powerful processing and a generous 192 KB Flash at the most optimized budget.
4. What kind of applications can the 192 KB Flash and 20 KB SRAM combination support? Will memory become a bottleneck?
The 192 KB Flash, one of the largest in the L0 series, can easily accommodate FreeRTOS, USB device stacks (CDC virtual COM port or HID), complex sensor drivers, and communication middleware. The 20 KB SRAM is typically sufficient for data‑acquisition, protocol‑conversion, and wireless gateway applications that do not require large display buffers. If larger RAM is needed, external PSRAM can be added via SPI, or you can migrate to the L1 series (e.g., L151/152) with more SRAM.
5. How low is the 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
6. What communication modes does the USB 2.0 full‑speed device interface support, and what are the mandatory clock requirements?
The USB controller can be configured as a CDC virtual COM port (for serial communication with a PC or mobile device), an HID keyboard/mouse, or an MSC mass storage device. Because the USB protocol demands clock accuracy within 0.25%, the internal RC oscillator is insufficient. An external high‑precision 8 MHz or 16 MHz crystal must be used; otherwise, the device will fail enumeration or exhibit unstable communication.
7. What are the characteristics of the built‑in 12‑bit ADC? Can it meet typical sensor acquisition needs?
It offers multiple external input channels with a maximum sampling rate of 1.14 Msps, 12‑bit resolution, and supports single, continuous, and scan modes, plus a built‑in window comparator. It is fully capable of acquiring common sensor signals such as temperature, pressure, and light. The ADC can remain active in low‑power modes and wake the CPU via an analog watchdog, making it ideal for battery‑powered devices that need periodic analog monitoring.
8. If my project requires a segment display or analog output, can the L071 be externally expanded?
Yes. For segment displays, you can connect an external segment LCD driver chip (e.g., HT1621) via I²C or SPI. For analog output, you can use a PWM channel with an external RC low‑pass filter to generate low‑frequency analog voltages, or connect a low‑cost DAC chip (e.g., MCP4725) via SPI/I²C. If these features are essential, upgrading directly to the L073 series, which integrates a segment LCD and DAC on‑chip, is a more streamlined solution.
9. What development tools are needed for the STM32L071RZT6? 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 is highly compatible—though it carries an L073 chip, the L071 shares the same core and many peripherals, so code can be ported with minimal adjustments.
10. What upgrade paths are available if I later need richer peripherals or higher performance?
If you simply need to add segment display, DAC, or touch sensing, you can drop‑in upgrade to the pin‑compatible STM32L073RZT6 (same 192 KB Flash, plus LCD, DAC, and TSC). If significantly higher computing power or color TFT displays are desired, the STM32L4 series is an excellent direction, although most L4 devices no longer integrate a segment LCD or DAC. For applications that continue to rely on ultra‑low power, USB, and ADC, the L071 remains a highly cost‑effective choice.