STMicroelectronics STM32L152CBT6A

Overview

STM32L152CBT6A 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 delivers 1.25 DMIPS/MHz performance-ideal for battery-powered medical sensors and portable industrial monitors.

For engineers reviewing the STM32L152CBT6A datasheet, STM32L152CBT6A pinout, STM32L152CBT6A application, or STM32L152CBT6A equivalent, key selection criteria include standby current (0.28 µA), ADC resolution (12-bit, 1 Msps, 24 channels), DAC channel count (2), LCD driver capability, and USB 2.0 support with internal 48 MHz PLL.

Technical Context

This MCU implements a multi-voltage-domain architecture with dynamic voltage scaling (DVS) enabling three power-performance operating ranges: ULP (ultra-low-power), LP (low-power), and HP (high-performance). Its memory protection unit (MPU), ECC-protected Flash/SRAM/EEPROM, and dual watchdog timers (IWDG + WWDG) support functional safety in Class B applications.

The clock system integrates six independent sources: HSE (1–24 MHz), LSE (32.768 kHz), HSI (16 MHz ±1%), LSI (37 kHz), MSI (65 kHz–4.2 MHz), and USB PLL (48 MHz). All peripherals-including USB, ADC, DAC, comparators, and capacitive sensing-are accessible in low-power run mode (10.9 µA) with sub-8 µs wakeup latency.

Key Specifications

Pinout & Package

LQFP48 package (7 × 7 mm, 0.5 mm pitch), 48-pin quad flat lead-free package with exposed thermal pad; RoHS-compliant, 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 ARM Cortex-M3 microcontroller applications.

Compared with STM32L152CBT6A, STM32L432KCU6 trades LCD/EEPROM integration for higher compute throughput and deeper sleep, while EFM32PG12B500F1024GL125 offers massive memory headroom at the cost of peripheral consolidation-making STM32L152CBT6A optimal for display-centric, battery-constrained designs requiring on-chip analog and timing resources.

Availability

STM32L152CBT6A is available at Aetrix Electronics and suitable for wearable health monitors, portable gas detectors, industrial panel meters, and smart meter display modules requiring stable component supply across extended product lifecycles.

Supply support for STM32L152CBT6A 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 demanding extended battery life, robust analog integration, and industrial temperature resilience-designed specifically for portable instrumentation, energy metering, and medical wearables.

FAQ

What is the maximum operating frequency and corresponding power consumption in Run mode?

The STM32L152CBT6A achieves a maximum CPU frequency of 32 MHz. At this speed, typical current consumption is 185 µA/MHz when executing code from Flash, resulting in ~5.92 mA total. This value assumes VDD = 3.3 V, ambient temperature = 25°C, and all peripherals disabled except core logic and Flash interface.

Does STM32L152CBT6A support USB device functionality without external components?

Yes. The part integrates a full-speed USB 2.0 transceiver with internal pull-up resistors and 48 MHz PLL clock generation. Only a standard USB Type-A connector and proper PCB layout (impedance-controlled D+/D− traces) are required-no external PHY, oscillator, or level-shifting components are needed for basic HID or CDC device operation.

How does the LCD controller handle contrast and bias voltage requirements?

The integrated LCD controller provides programmable contrast adjustment via software-controlled internal resistor ladder and includes an on-chip step-up converter generating VLCD from VDD. This eliminates need for external charge pumps or bias supplies, supporting direct connection to common 3.3 V or 5 V systems while maintaining stable segment drive voltage across battery discharge.

What are the key differences between STM32L152CBT6A and STM32L151CBT6A?

The STM32L152CBT6A includes an LCD controller (supporting up to 8×40 segments), USB 2.0 interface, and two 12-bit DACs-features absent in the STM32L151CBT6A. Both share identical Flash/RAM/EEPROM sizes, core, and low-power architecture, but only the 'L152' variant supports display-driven applications and USB-based firmware updates.