STMicroelectronics STM32L152R8T6

Overview

STM32L152R8T6 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, USB 2.0 interface, 12-bit ADC (1 Msps, 24 channels), and dual 12-bit DACs - deployed in battery-powered medical sensors, portable industrial loggers, and smart utility meters requiring sub-1 µA standby current and RTC retention.

For engineers reviewing the STM32L152R8T6 datasheet, STM32L152R8T6 pinout, STM32L152R8T6 application, or STM32L152R8T6 equivalent, key selection criteria include ultra-low-power mode timing (e.g., 0.9 µA Standby + RTC), LCD driver support (exclusive to STM32L152xx), USB 2.0 full-speed capability with internal 48 MHz PLL, and capacitive touch sensing up to 20 channels.

Technical Context

The STM32L152R8T6 integrates a 32 MHz ARM Cortex-M3 core with MPU, dynamic voltage scaling, and five low-power modes (Run, Sleep, Low-power Run, Stop, Standby) governed by an ultra-safe BOR with five threshold levels and programmable voltage detector (PVD). Its clock system combines HSE (1–24 MHz), LSE (32.768 kHz), HSI (16 MHz ±1%), LSI (37 kHz), and MSI (65 kHz–4.2 MHz) sources, plus a USB-capable PLL.

Analog subsystem includes two ultra-low-power comparators with window mode and wake-up capability, temperature sensor, VREFINT reference, and dedicated LCD controller supporting up to 8×40 segments - a feature distinguishing STM32L152 from STM32L151 variants. Memory protection unit (MPU), ECC on Flash and EEPROM, and 96-bit unique ID enhance reliability for certified embedded applications.

Key Specifications

Pinout & Package

LQFP64 package (10 × 10 mm, 0.5 mm pitch), 64-pin quad flat lead frame with exposed thermal pad - compatible with standard reflow profiles and cost-effective PCB assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L152R8T6, STM32L432KCU6 trades ultra-low-power analog integration for computational throughput, while STM32L151R8T6 reduces BOM cost by removing LCD and DAC - making the R8T6 optimal for display-equipped, mixed-signal edge nodes needing long battery life and on-chip EEPROM.

Availability

STM32L152R8T6 is available at Aetrix Electronics and suitable for smart utility meters, portable medical diagnostics, and industrial wireless sensor nodes requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for ISO 13485 and IEC 62304 compliance.

Supply support for STM32L152R8T6 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, MEMS, and automotive semiconductors since 1987.

The STM32L1 series targets ultra-low-power embedded applications demanding multi-year battery life, robust analog integration, and certified functional safety - optimized for metering, portable healthcare, and environmental monitoring systems.

FAQ

Does STM32L152R8T6 support USB device mode without external crystal?

Yes. The STM32L152R8T6 integrates an internal 48 MHz PLL fed by the HSE or MSI oscillator, enabling full-speed USB 2.0 device operation without an external 48 MHz crystal. PA11/PA12 serve as native D+/D− pins with internal pull-ups, and the USB library supports CDC ACM and HID classes out-of-box with ST's HAL drivers.

What is the maximum operating temperature for industrial use?

The STM32L152R8T6 is qualified for operation from –40°C to +85°C ambient temperature, with extended variants (e.g., STM32L152R8T6X) rated to +105°C. All electrical characteristics in the datasheet (DocID17659 Rev 12) are guaranteed across this range, including ADC accuracy, RTC stability, and Flash write endurance.

How does the LCD controller differ between STM32L151 and STM32L152 variants?

The LCD controller is exclusive to STM32L152x6/8/B devices and absent in STM32L151x6/8/B. It supports up to 8 commons × 40 segments, on-chip step-up converter, contrast adjustment via software, and blinking mode - eliminating external bias generation circuitry. Pin assignments (VLCD, COM/SEG) are dedicated and not shared with general-purpose I/O.

Can the 4 KB EEPROM be used for firmware over-the-air (OTA) update storage?

Yes. The 4 KB true EEPROM (with ECC) is designed for frequent read/write cycles (100k erase/write cycles, 20-year data retention) and supports byte-level writes. It is commonly used to store OTA update metadata, cryptographic keys, and configuration parameters - separate from the main Flash, enabling safe dual-bank update schemes without risking bootloader corruption.