STMicroelectronics STM32L152CBU6A

Overview

STM32L152CBU6A 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 12-bit ADC (1 Msps, 24 channels), and dual 12-bit DACs with output buffers. It operates from 1.65 V to 3.6 V across –40°C to 105°C and supports USB 2.0, three USARTs, two SPIs, two I²Cs, and up to 83 fast I/Os - deployed in battery-powered medical sensors and portable industrial data loggers.

For engineers reviewing the STM32L152CBU6A datasheet, STM32L152CBU6A pinout, STM32L152CBU6A application, or STM32L152CBU6A equivalent, key selection criteria include standby current (0.28 µA), RTC-enabled stop mode (1.38 µA), 10.9 µA low-power run mode, 7-channel DMA support, and LCD driver capability exclusive to STM32L152 variants.

Technical Context

The STM32L152CBU6A implements dynamic voltage scaling and multiple low-power modes (Stop, Standby, Low-power Run) managed by an ultra-safe BOR with five thresholds and programmable voltage detector (PVD). Its clock system integrates a 32 kHz RTC oscillator with calibration, 16 MHz HSI RC (±1%), and PLL for USB 48 MHz generation.

Analog subsystem includes two ultra-low-power comparators with window mode and wake-up capability, temperature sensor, internal VREFINT, and true EEPROM with ECC - all functional down to 1.8 V supply. The device supports capacitive touch sensing on up to 20 channels for rotary/linear/touchkey interfaces.

Key Specifications

Pinout & Package

STM32L152CBU6A is housed in a 48-pin UFQFPN package (7 × 7 mm, 0.5 mm pitch) with exposed thermal pad. This compact, lead-free RoHS-compliant package supports high-density PCB layouts and efficient thermal dissipation in space-constrained portable electronics.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L152CBU6A, STM32L432KCU6 trades EEPROM and ultra-low-power analog features for floating-point performance, while STM32L072CBT6 reduces feature set and cost but omits critical peripherals like USB and dual DAC - making STM32L152CBU6A optimal for mixed-signal, battery-critical designs requiring integrated precision analog and display support.

Availability

STM32L152CBU6A is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, portable gas detectors, and industrial wireless sensor nodes requiring stable component supply across extended product lifecycles.

Supply support for STM32L152CBU6A 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.

The STM32L1 series targets ultra-low-power embedded applications - optimized for battery-operated devices demanding long runtime, robust analog integration, and industrial-grade reliability from –40°C to 105°C.

FAQ

What is the maximum operating frequency and core architecture of STM32L152CBU6A?

The STM32L152CBU6A uses an ARM Cortex-M3 32-bit core with a maximum CPU frequency of 32 MHz. It achieves 1.25 DMIPS/MHz (Dhrystone 2.1) and includes a Memory Protection Unit (MPU) for secure memory partitioning. The core supports Thumb-2 instruction set and operates across the full 1.65 V–3.6 V supply range.

Does STM32L152CBU6A include an integrated LCD controller, and which variants support it?

Yes - the STM32L152CBU6A includes an integrated LCD controller supporting up to 8×40 segments, contrast adjustment, blinking mode, and on-board step-up converter. This feature is exclusive to STM32L152x6/8/B-A devices; STM32L151 variants do not include LCD hardware per the official datasheet (Section 3.9).

What are the key low-power mode current specifications for STM32L152CBU6A?

Key low-power currents are: 0.28 µA in Standby mode (3 wakeup pins), 1.11 µA in Standby + RTC, 0.44 µA in Stop mode (16 wakeup lines), 1.38 µA in Stop + RTC, 10.9 µA in Low-power Run mode, and 185 µA/MHz in Run mode. All values are measured at 25°C per datasheet Table 24 and Table 23.

Is the STM32L152CBU6A pin-compatible with other STM32L152 packages, and what is its package type?

STM32L152CBU6A uses the UFQFPN48 (7 × 7 mm, 0.5 mm pitch) package and is not pin-compatible with LQFP48 or TFBGA64 variants due to differing pin assignments and thermal pad layout. Pin mapping must be verified against Table 9 (Pin Definitions) in the official datasheet - mechanical compatibility does not imply electrical or functional equivalence.