STMicroelectronics STM32L152RET6

Overview

STM32L152RET6 from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M3 microcontroller with 512 KB Flash, 80 KB SRAM, 16 KB EEPROM, integrated LCD driver (8×40 segments), USB 2.0 interface, and dual 12-bit ADCs (1 Msps, up to 40 channels). It operates from 1.65 V to 3.6 V across –40 °C to +105 °C and delivers 195 µA/MHz in Run mode - used in battery-powered medical sensors and portable industrial data loggers requiring long runtime and on-chip analog signal conditioning.

For engineers reviewing the STM32L152RET6 datasheet, STM32L152RET6 pinout, STM32L152RET6 application, or STM32L152RET6 equivalent, key selection considerations include its 116 fast I/Os (102 5V-tolerant), ultra-low-power Stop mode (560 nA), dual operational amplifiers, 2×12-bit DACs with output buffers, and hardware CRC unit for firmware integrity verification.

Technical Context

The STM32L152RET6 implements a full Arm Cortex-M3 core with MPU, supporting dynamic voltage scaling and multiple low-power modes including Standby (290 nA), Stop + RTC (1.4 µA), and Low-power run (11 µA). Its clock system integrates five oscillators: HSE (1–24 MHz), LSE (32.768 kHz), HSI (16 MHz ±1%), LSI (37 kHz), and MSI (65 kHz–4.2 MHz), plus a 48 MHz PLL for USB timing.

Analog subsystem includes two rail-to-rail op-amps, two ultra-low-power comparators with window mode and wake-up capability, a 12-bit temperature sensor, internal VREFINT, and dedicated LCD controller with contrast adjustment and step-up converter - all functional down to 1.8 V supply.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm) package with 64-pin quad flat lead frame; RoHS-compliant, moisture sensitivity level 3 (MSL3).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L152RET6, STM32L432KCU6 trades EEPROM and LCD integration for FPU and lower-cost packaging, while EFM32PG12B500F1024GL125 offers larger memory and deeper sleep at the cost of USB and display support - choice depends on whether on-chip analog display control or cryptographic compute dominates the design.

Availability

STM32L152RET6 is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, portable gas detectors, and industrial predictive maintenance sensors requiring stable component supply across extended product lifecycles.

Supply support for STM32L152RET6 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, integrated analog peripherals, and robust security - designed specifically for portable medical, environmental monitoring, and smart metering systems.

FAQ

What is the maximum operating frequency and core type of the STM32L152RET6?

The STM32L152RET6 features an Arm Cortex-M3 core rated for up to 32 MHz operation, delivering 1.25 DMIPS/MHz (Dhrystone 2.1). It includes a Memory Protection Unit (MPU) and supports dynamic voltage scaling to optimize performance versus power consumption across operating modes.

Does the STM32L152RET6 support USB functionality without external components?

Yes - it integrates a full-speed USB 2.0 device interface with an internal 48 MHz PLL, requiring only passive termination on PA11 (D−) and PA12 (D+) pins. No external PHY or clock crystal is needed for standard HID or CDC-class enumeration and data transfer.

How does the LCD controller in the STM32L152RET6 reduce system-level complexity?

The integrated LCD controller supports up to 8×40 segments with programmable contrast, blinking, and an internal step-up converter. This eliminates the need for external LCD bias generators or driver ICs, reducing BOM count, PCB area, and power conversion losses in portable instrumentation displays.

What are the key low-power modes and their typical current consumption values?

Key low-power modes include Stop mode (560 nA), Standby mode (290 nA), and Low-power run mode (11 µA). All retain SRAM content and allow wake-up via multiple sources: 16 wakeup lines in Stop, 3 wakeup pins in Standby, and configurable EXTI events across all modes - enabling flexible power-state management in battery-critical designs.