STMicroelectronics STM32L152CBT6

Overview

STM32L152CBT6 from STMicroelectronics is an ultra-low-power 32-bit ARM Cortex-M3 microcontroller with 128 KB Flash, 16 KB SRAM, 4 KB EEPROM, integrated LCD driver (up to 8×40 segments), USB 2.0 interface, 12-bit ADC (1 Msps, 24 channels), and dual 12-bit DACs - deployed in battery-powered medical sensors, portable industrial meters, and smart utility endpoints requiring sub-1 µA standby current and RTC retention.

For engineers reviewing the STM32L152CBT6 datasheet, STM32L152CBT6 pinout, STM32L152CBT6 application, or STM32L152CBT6 equivalent, key selection criteria include ultra-low-power mode timing (e.g., 0.3 µA Standby + 3 wakeup pins), LCD controller support (exclusive to STM32L152xx), USB 2.0 compliance with internal 48 MHz PLL, and capacitive touch sensing (20 channels) for human-interface designs.

Technical Context

The STM32L152CBT6 implements a 32-bit ARM Cortex-M3 core operating up to 32 MHz with 1.25 DMIPS/MHz performance and a memory protection unit (MPU). It supports dynamic voltage scaling across five low-power modes - including Stop mode (0.57 µA) and Standby mode (0.3 µA) - each with configurable wakeup sources and RTC backup capability.

Clock architecture integrates multiple oscillators: 1–24 MHz external crystal, 32 kHz LSE for RTC calibration, 16 MHz HSI RC (±1%), and a programmable PLL for USB clock generation. Analog subsystem includes two ultra-low-power comparators with window mode and wake-up capability, plus temperature sensor and VREFINT reference.

Key Specifications

Pinout & Package

LQFP48 package (7 × 7 mm, 0.5 mm pitch), 48-pin quad flat lead-free package with exposed thermal pad - optimized for compact PCB layouts and thermal dissipation in space-constrained embedded systems.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L152CBT6, STM32L072CBT6 trades LCD/USB for lower cost and simpler architecture, while STM32L432KCU6 upgrades CPU and memory at the expense of integrated display support - making STM32L152CBT6 optimal for self-contained, ultra-low-power display-centric designs.

Availability

STM32L152CBT6 is available at Aetrix Electronics and suitable for battery-powered medical sensors, portable industrial meters, and smart utility endpoints requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.

Supply support for STM32L152CBT6 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-grade components since 1987.

The STM32L1 series targets ultra-low-power embedded applications - emphasizing energy efficiency, integrated peripherals (LCD, EEPROM, capacitive sensing), and extended battery life in portable and remote monitoring systems.

FAQ

Does STM32L152CBT6 support USB device mode without external components?

Yes. The STM32L152CBT6 integrates a full-speed USB 2.0 transceiver with internal 48 MHz PLL and pull-up resistors. Only standard USB termination (1.5 kΩ pull-up on D+ and 22-Ω series resistors) and proper PCB layout are required - no external PHY or clock oscillator needed for basic device-mode operation.

What is the maximum number of LCD segments supported, and does it require external bias?

The STM32L152CBT6 supports up to 8 common lines and 40 segment lines (8×40 segments) via dedicated LCD_COM and LCD_SEG pins. It includes an on-chip step-up converter and contrast control register - eliminating the need for external LCD bias generators or external voltage multipliers.

How many capacitive sensing channels are available, and what sensor types are supported?

The device provides 20 dedicated capacitive sensing channels using its CSD (Capacitive Sensing Controller). It natively supports touchkey, linear touch sliders, and rotary touch wheels - with built-in de-bounce, auto-calibration, and low-power scan modes configurable via HAL drivers.

Is the 4 KB EEPROM truly independent of Flash, and what is its endurance rating?

Yes. The 4 KB EEPROM is a separate memory block with dedicated ECC logic, distinct from Flash. ST specifies 100,000 write/erase cycles and 20-year data retention at 85°C - validated per JEDEC JESD22-A117, enabling reliable storage of calibration coefficients and device-specific parameters.