STMicroelectronics STM32L073RZH6

Overview

STM32L073RZH6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M0+ microcontroller in LQFP100 package, featuring 192 KB Flash with ECC, 20 KB SRAM, 6 KB EEPROM, integrated LCD driver (up to 4×52 segments), USB 2.0 crystal-less interface, and dual 12-bit DACs. It operates from 1.65–3.6 V across –40 to +125 °C and targets battery-powered industrial sensors and portable medical devices requiring long runtime and on-chip analog integration.

For engineers reviewing the STM32L073RZH6 datasheet, STM32L073RZH6 pinout, STM32L073RZH6 application, or STM32L073RZH6 equivalent, key selection criteria include its 0.86 µA Stop mode + RTC + 20-KB RAM retention, 12-bit ADC at 1.14 Msps (16 channels), and hardware-accelerated capacitive touch sensing supporting up to 24 channels - critical for low-power HMI and sensor node designs.

Technical Context

The STM32L073RZH6 integrates a Cortex-M0+ core with MPU, running up to 32 MHz via PLL or internal 16 MHz RC (+/−1%), and supports dynamic voltage scaling for optimized power/performance trade-offs. Its interconnect matrix enables concurrent peripheral operation - e.g., ADC conversion while DMA transfers data to SRAM without CPU intervention.

Low-power architecture includes five operational modes: Run (93 µA/MHz), Sleep, Low-power Run/Sleep, Stop (0.43 µA), and Standby (0.29 µA). The embedded 48 MHz HSI48 RC oscillator is self-calibrated for USB timing accuracy, eliminating external crystal requirements for full-speed USB 2.0 communication.

Key Specifications

Pinout & Package

LQFP100 (14 × 14 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 STM32L073RZH6 adds 64 KB Flash and full LCD capability - essential for display-centric designs; versus STM32L433RCT6, it trades FPU and memory for superior ultra-low-power metrics and integrated analog peripherals, making it optimal for battery-limited HMI and sensor edge nodes.

Availability

STM32L073RZH6 is available at Aetrix Electronics and suitable for smart utility meters, portable medical monitors, industrial wireless sensor nodes, and low-power HVAC controllers requiring stable component supply across extended product lifecycles.

Supply support for STM32L073RZH6 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 automotive semiconductors.

The STM32L0 series targets ultra-low-power embedded applications demanding sub-µA standby, integrated analog, and long-term battery operation - optimized for IoT edge nodes, wearables, and energy-harvesting systems.

FAQ

What is the maximum operating frequency and how is it achieved?

The STM32L073RZH6 achieves a maximum CPU frequency of 32 MHz using its PLL, which can be clocked from the 1–25 MHz HSE crystal oscillator or the internally calibrated 16 MHz HSI16 RC oscillator. The PLL supports integer multiplication factors and is fully configurable via RCC registers; factory-trimmed HSI16 offers ±1% accuracy, enabling reliable 32 MHz operation without external crystal in many applications.

Does the part support hardware encryption or secure boot features?

The STM32L073RZH6 includes a true random number generator (RNG) compliant with NIST SP800-90B and a memory protection unit (MPU) for privilege-level access control. While it lacks dedicated AES or SHA accelerators, the RNG and MPU provide foundational security for secure boot implementation, firmware authentication, and protected key storage - validated in ST's AN4821 and UM1723 documentation.

Can the internal 48 MHz RC oscillator meet USB Full-Speed timing requirements without calibration?

Yes - the HSI48 oscillator is factory-calibrated and continuously self-tuned using the USB SOF packet stream, achieving ±0.25% accuracy over temperature and voltage. This meets USB 2.0 Full-Speed (12 MHz) timing tolerance without requiring an external crystal, confirmed in Section 6.3.7 and Figure 135 of DS10685 Rev 7.

What LCD configurations does the integrated driver support, and what external components are needed?

The LCD controller supports up to 4 commons × 52 segments or 8 commons × 48 segments, with programmable bias, frame frequency, and contrast. An on-chip step-up converter generates VLCD from VDD, eliminating external boost ICs; only external capacitors (as specified in Table 123, DS10685) and optional external resistors for contrast tuning are required - no external power supply or driver IC needed.