STMicroelectronics STM32L152R8H6

Overview

STM32L152R8H6 from STMicroelectronics is an ultra-low-power 32-bit ARM® Cortex®-M3 microcontroller featuring 128 KB Flash, 16 KB SRAM, 4 KB EEPROM with ECC, integrated LCD controller (up to 8×40 segments), and USB 2.0 interface. It operates from 1.65 V to 3.6 V across -40°C to +85°C, supports 32 MHz max CPU frequency, and delivers 214 µA/MHz active current consumption - optimized for battery-powered industrial sensors and portable medical devices.

For engineers reviewing the STM32L152R8H6 datasheet, STM32L152R8H6 pinout, STM32L152R8H6 application, or STM32L152R8H6 equivalent, key selection criteria include ultra-low-power mode timing (e.g., 0.57 µA Stop mode), dual 12-bit DAC channels with buffers, 24-channel 1 Msps ADC, USB 2.0 compliance with internal 48 MHz PLL, and 73 I/Os (5V-tolerant) mappable to 16 external interrupt vectors.

Technical Context

The STM32L152R8H6 integrates a Cortex-M3 core with MPU, dynamic voltage scaling, and five low-power modes (Run, Sleep, Low-power Run/Sleep, Stop, Standby) governed by programmable voltage detector (PVD) and ultra-safe BOR with five thresholds. Its clock system combines HSE (1–24 MHz), LSE (32.768 kHz RTC), HSI (16 MHz ±1%), LSI (37 kHz), and MSI (65 kHz–4.2 MHz), plus a dedicated USB PLL generating 48 MHz.

Analog subsystem includes two independent 12-bit DACs with output buffers, a 24-channel 12-bit ADC (1 Msps), two ultra-low-power comparators with window mode and wake-up capability, and on-chip temperature sensor/VREFINT. The LCD controller supports contrast adjustment, blinking, and integrated step-up converter - exclusive to STM32L152 variants.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad; 64-pin quad flat configuration supporting full peripheral remapping and 5V-tolerant I/Os.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power ARM Cortex-M3 microcontroller applications.

Compared with STM32L072RBT6, the STM32L152R8H6 adds LCD, dual DAC, and true EEPROM - critical for display-driven medical devices; versus STM32L432KCU6, it trades M4F compute for guaranteed EEPROM endurance and lower active current, favoring long-life battery operation over raw throughput.

Availability

STM32L152R8H6 is available at Aetrix Electronics and suitable for smart utility meters, portable ECG monitors, industrial wireless sensor nodes, and asset tracking beacons requiring stable component supply across extended product lifecycles.

Supply support for STM32L152R8H6 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 since 1987.

The STM32L1 series targets ultra-low-power embedded applications demanding multi-year battery life, robust analog integration, and secure firmware execution - especially in metering, wearables, and industrial IoT edge nodes.

FAQ

What is the maximum operating frequency and corresponding power consumption of the STM32L152R8H6?

The STM32L152R8H6 achieves a maximum CPU frequency of 32 MHz in Run mode, consuming 214 µA/MHz at 3.3 V and 25°C. At full speed, total active current is approximately 6.85 mA. Dynamic voltage scaling allows reduced Vcore in Low-power Run mode (down to 9 µA) at lower frequencies, enabling optimal energy-per-instruction trade-offs.

Does the STM32L152R8H6 support USB without an external crystal?

Yes. The STM32L152R8H6 integrates a USB 2.0 Full-Speed transceiver with an internal 48 MHz PLL that locks to the HSE (1–24 MHz) or HSI (16 MHz) clock source. No external 48 MHz crystal is required - the PLL synthesizes the precise USB clock, reducing BOM cost and board area while maintaining full USB compliance.

How many I/O pins are 5V tolerant, and what is their safe operating voltage range?

All 73 general-purpose I/Os on the STM32L152R8H6 are 5V tolerant when VDD is powered (1.65–3.6 V). They accept input voltages up to 5.5 V regardless of VDD level, enabling direct interfacing with legacy 5V logic, sensors, and displays without level shifters - verified per I/O AC/DC characteristics in Section 6.3.13 of the datasheet.

What is the endurance and data retention specification for the integrated EEPROM?

The STM32L152R8H6's 4 KB true EEPROM supports 100,000 write/erase cycles and guarantees data retention for 20 years at 85°C or 40 years at 25°C. Each byte is independently erasable, and ECC circuitry detects and corrects single-bit errors - making it suitable for mission-critical parameter storage in medical and industrial equipment without external memory.