STMicroelectronics STM32L152RBH6A

Overview

STM32L152RBH6A from STMicroelectronics is an ultra-low-power 32-bit ARM® Cortex®-M3 microcontroller featuring 128 KB Flash, 32 KB SRAM, 4 KB EEPROM with ECC, integrated LCD controller (up to 8×40 segments), USB 2.0 interface, and dual 12-bit DACs. It operates from 1.65 V to 3.6 V across –40°C to +105°C and targets battery-powered industrial sensors, portable medical devices, and smart metering endpoints requiring long runtime and mixed-signal integration.

For engineers reviewing the STM32L152RBH6A datasheet, STM32L152RBH6A pinout, STM32L152RBH6A application, or STM32L152RBH6A equivalent, key selection considerations include standby current (0.28 µA), 12-bit ADC with 24 channels and 1 Msps sampling, USB 2.0 full-speed support with internal 48 MHz PLL, LCD driver capability, and ultra-low-power comparators with wake-up functionality.

Technical Context

The STM32L152RBH6A implements a 32-bit ARM Cortex-M3 core running at up to 32 MHz with MPU, dynamic voltage scaling, and five low-power modes (Run, Sleep, Low-power Run, Stop, Standby). Its clock system integrates multiple 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 USB PLL generating 48 MHz for full-speed operation.

Analog subsystem includes a 12-bit ADC with 24 input channels and 1 Msps conversion rate, two buffered 12-bit DACs, two ultra-low-power comparators with window mode and wake-up capability, and an on-chip temperature sensor. The LCD controller supports up to 8×40 segments with contrast adjustment and blinking mode, and includes an integrated step-up converter.

Key Specifications

Pinout & Package

LQFP64 package (10 × 10 mm, 0.5 mm pitch), 64-pin quad flat lead-free package with exposed thermal pad; RoHS compliant and rated for industrial temperature range (–40°C to +105°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L152RBH6A, the STM32L432KCU6 offers superior computational throughput and lower static power but sacrifices LCD and EEPROM integration; the EFM32PG12B500F1024GL125 provides larger memory and robust sleep retention but requires external USB/LCD solutions and consumes more active power.

Availability

STM32L152RBH6A is available at Aetrix Electronics and suitable for smart metering, portable diagnostics, industrial sensor nodes, and building automation systems requiring stable component supply, extended temperature operation, and long-term lifecycle support.

Supply support for STM32L152RBH6A 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 extended battery life, high analog integration, and industrial-grade reliability - optimized for metering, wearables, and environmental monitoring.

FAQ

Does STM32L152RBH6A support USB device mode without external components?

Yes. The STM32L152RBH6A integrates a full-speed USB 2.0 transceiver with internal pull-up resistors and a dedicated 48 MHz PLL. Only standard USB termination (22 Ω series resistors on DP/DM) and proper PCB layout are required - no external PHY, level shifter, or oscillator is needed for basic device-mode operation.

What is the maximum segment count supported by the LCD controller?

The STM32L152RBH6A LCD controller supports up to 8 commons and 40 segments (8×40 = 320 segments total), with software-configurable duty and bias ratios. It includes an on-chip step-up converter (VLCD output up to 5.3 V), contrast adjustment, and blinking mode - eliminating external LCD bias circuitry.

How does the 4 KB EEPROM differ from standard Flash emulation?

This is true hardware EEPROM (not Flash-emulated), implemented as a separate memory block with dedicated ECC logic. It supports byte-level writes, 100 kcycle endurance, and 20-year data retention at 85°C - enabling reliable storage of calibration coefficients, serial numbers, or usage counters without wear-leveling overhead or erase-block constraints.

Can the ultra-low-power comparators wake the MCU from Stop mode?

Yes. Both comparators support wake-up capability from Stop mode (0.44 µA) and Standby mode (0.28 µA). Each can be configured in window mode or basic compare mode, with programmable hysteresis and selectable input sources - enabling autonomous sensor threshold monitoring without CPU intervention.