STMicroelectronics STM32L071RZH6

Overview

STM32L071RZH6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in LQFP64 package, featuring 192 KB Flash with ECC, 20 KB SRAM, 6 KB EEPROM, 12-bit ADC (1.14 Msps), and operation from 1.65 V to 3.6 V across –40 °C to +125 °C. It delivers 0.95 DMIPS/MHz performance and supports battery-powered IoT sensor nodes requiring long runtime and RTC-backed data logging.

For engineers reviewing the STM32L071RZH6 datasheet, STM32L071RZH6 pinout, STM32L071RZH6 application, or STM32L071RZH6 equivalent, key selection criteria include standby current (0.29 µA), 5 µs Flash wakeup time, 78 5V-tolerant I/Os, and integrated ultra-low-power comparators with wake-up capability down to 1.65 V.

Technical Context

The device implements a dual-bank Flash architecture enabling read-while-write operation and hardware ECC for reliability. Its power management includes five BOR thresholds, programmable voltage detector (PVD), and three low-power clock sources (LSI, LSE, MSI) supporting dynamic voltage scaling across Run, Sleep, Stop, and Standby modes.

Clock generation integrates a 16 MHz factory-trimmed HSI RC (+/–1%), PLL for CPU boosting, and dedicated 32 kHz RTC oscillator with calibration. Peripheral interconnect uses a matrix-based AHB/APB bus structure enabling concurrent DMA transfers to ADC, USART, SPI, and timers without CPU intervention.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant, ECOPACK2 certified.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power MCU applications.

Compared with STM32L072RZT6, the STM32L071RZH6 omits hardware crypto but reduces BOM cost and power in non-security-critical deployments; versus STM32L432KCU6, it trades peak performance for significantly lower static and dynamic power-ideal for energy-harvested or coin-cell-powered endpoints.

Availability

STM32L071RZH6 is available at Aetrix Electronics and suitable for smart metering, wearable health monitors, industrial predictive maintenance nodes, and asset tracking beacons requiring stable component supply and long-term lifecycle assurance.

Supply support for STM32L071RZH6 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing microcontrollers, power management ICs, sensors, and analog products for industrial, automotive, and consumer markets.

The STM32L0 series targets ultra-low-power embedded applications, emphasizing energy efficiency, integrated peripherals, and robustness in extended-temperature and battery-constrained environments.

FAQ

What is the maximum operating frequency and corresponding power supply range for STM32L071RZH6?

The STM32L071RZH6 operates up to 32 MHz when powered between 2.4 V and 3.6 V. At lower voltages (1.65–2.4 V), the maximum frequency is reduced to 16 MHz to maintain stability and meet ultra-low-power specifications. This dynamic voltage scaling is managed automatically by the embedded regulator and verified in Section 6.3.1 of the DS10690 datasheet.

Does STM32L071RZH6 support hardware encryption or secure boot features?

No, the STM32L071RZH6 does not include hardware AES, DES, or PKA accelerators, nor does it feature secure boot ROM or tamper-detection circuitry. These capabilities are present in the pin-compatible STM32L072xx variant. The L071 relies on software-based cryptography and standard boot validation via option bytes and readout protection levels.

How many I/O pins support 5V tolerance, and which specific pins are they?

78 I/O pins on the STM32L071RZH6 are 5V tolerant, covering all GPIOs except those assigned to analog functions (e.g., ADC inputs, VREF+, VBAT) and dedicated system pins (NRST, BOOT0). Pin-by-pin tolerance status is defined in Table 15 (pin definition) and confirmed in Section 6.3.13 of the DS10690 datasheet.

Can the internal 32 kHz LSE oscillator be calibrated, and what accuracy is achievable?

Yes, the LSE oscillator supports digital calibration via the RCC_BDCR register's CAL[7:0] field, allowing adjustment in ±128 ppm steps. With factory calibration data stored in system memory (address 0x1FFFF7AC), typical accuracy reaches ±10 ppm over –40 °C to +85 °C, as specified in Table 45 of the DS10690 datasheet.