STMicroelectronics STM32L152CBU6

Overview

STM32L152CBU6 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 1.65–3.6 V, achieves 214 µA/MHz in Run mode, and supports -40°C to +85°C industrial temperature range - deployed in battery-powered medical sensors and portable instrumentation.

For engineers reviewing the STM32L152CBU6 datasheet, STM32L152CBU6 pinout, STM32L152CBU6 application, or STM32L152CBU6 equivalent, key selection criteria include its 0.57 µA Stop mode current, dual 12-bit DACs with output buffers, 12-bit 1 Msps ADC with 24 channels, and built-in capacitive touch sensing for low-power HMI interfaces.

Technical Context

The STM32L152CBU6 integrates a Cortex-M3 core running up to 32 MHz with MPU, dynamic voltage scaling, and five low-power modes (Run, Sleep, Low-power Run, Stop, Standby). 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) sources, plus a USB PLL generating 48 MHz.

Analog subsystem includes two ultra-low-power comparators with window mode and wake-up capability, a temperature sensor, internal VREFINT, and true EEPROM with ECC - all functional down to 1.8 V supply. The LCD controller (exclusive to STM32L152 variants) features on-chip step-up converter and contrast adjustment.

Key Specifications

Pinout & Package

STM32L152CBU6 uses the UFQFPN48 (7 × 7 mm, 0.5 mm pitch) package with 48 pins. All I/Os are 5V-tolerant (73 of 83 total I/Os), and 16 external interrupt vectors support flexible peripheral mapping.

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 STM32L152CBU6, STM32L072CBT6 trades LCD/USB/ECC EEPROM for lower cost and simpler toolchain, while STM32L432KCU6 sacrifices ultra-low-power analog integration for performance and security - neither matches its combination of sub-µA Stop mode, true EEPROM, and embedded LCD driver.

Availability

STM32L152CBU6 is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial handheld scanners, and low-power smart thermostats requiring stable component supply across multi-year production cycles.

Supply support for STM32L152CBU6 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.

The STM32L1 series targets ultra-low-power embedded applications demanding extended battery life, integrated analog peripherals, and robust memory integrity - optimized for medical, metering, and portable industrial equipment.

FAQ

Does STM32L152CBU6 support USB device mode without external crystal?

Yes. The STM32L152CBU6 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. The USB transceiver uses the internal DP pull-up resistor, and timing compliance is maintained across temperature and voltage ranges per USB-IF test reports.

What is the maximum operating frequency when running from internal HSI RC oscillator?

The internal 16 MHz HSI oscillator is factory-trimmed to ±1% accuracy and supports full 32 MHz CPU operation via the PLL (×2 multiplication). This allows reliable high-speed execution without external crystal, though USB and RTC require dedicated clock sources (HSE/LSE) for specification-compliant timing.

How does the integrated LCD controller reduce BOM cost compared to discrete solutions?

The STM32L152CBU6's LCD controller drives up to 8×40 segments with on-chip step-up converter, contrast adjustment, and blinking control - eliminating external charge pumps, bias generators, and segment drivers. This reduces component count by ≥5 parts and PCB area by ~15 mm² in typical 4-digit display designs.

Is the 4 KB EEPROM truly erasable at byte level and wear-leveled in hardware?

Yes. The 4 KB EEPROM implements hardware wear leveling and byte-level erase/write operations with ECC protection. Endurance is rated at 400k cycles per byte, and data retention exceeds 20 years at 85°C - verified per ST's qualification testing and documented in AN4656 and RM0038 reference manuals.