STMicroelectronics STM32L152RBT6A

Overview

STM32L152RBT6A 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 Full-Speed via internal 48 MHz PLL - deployed in battery-powered medical sensors and portable industrial data loggers.

For engineers reviewing the STM32L152RBT6A datasheet, STM32L152RBT6A pinout, STM32L152RBT6A application, or STM32L152RBT6A equivalent, key selection criteria include standby current (0.28 µA), LCD driver support (8×40 segments), capacitive touch sensing (up to 20 channels), and ultra-low-power run mode (10.9 µA).

Technical Context

The STM32L152RBT6A implements a full-featured Cortex-M3 core with MPU, dynamic voltage scaling, and five low-power modes (Run, Sleep, Low-power Run, Stop, Standby) optimized for energy-constrained systems. Its clock system integrates multiple oscillators: 1–24 MHz HSE, 32 kHz LSE for RTC, 16 MHz HSI (±1%), and multispeed MSI (65 kHz–4.2 MHz), all feeding a programmable PLL for CPU and USB clocks.

Analog subsystem includes two ultra-low-power comparators with window mode and wake-up capability, temperature sensor, VREFINT reference, and dedicated LCD controller supporting contrast adjustment and on-board step-up converter - exclusive to STM32L152 variants (not present in L151 series).

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad - optimized for compact PCB layout and thermal dissipation in space-constrained industrial modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L152RBT6A, STM32L432KCU6 offers floating-point acceleration and deeper sleep but omits EEPROM and LCD; EFM32PG12B500F1024GL125 provides larger memory and lower deep-sleep current but adds design complexity due to missing USB and LCD peripherals.

Availability

STM32L152RBT6A is available at Aetrix Electronics and suitable for portable medical sensors, smart utility meters, industrial data loggers, and handheld test instruments requiring stable component supply across extended product lifecycles.

Supply support for STM32L152RBT6A 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 - emphasizing energy efficiency, integrated analog peripherals, and long-term reliability in battery-operated and energy-harvesting systems.

FAQ

What is the maximum operating frequency and core architecture of the STM32L152RBT6A?

The STM32L152RBT6A features an ARM Cortex-M3 core rated for up to 32 MHz operation, delivering 1.25 DMIPS/MHz (Dhrystone 2.1). It includes a Memory Protection Unit (MPU) and supports Thumb-2 instruction set. Maximum frequency is achievable within the 1.65–3.6 V supply range and –40°C to 105°C ambient temperature.

Does the STM32L152RBT6A include an integrated LCD controller, and what are its capabilities?

Yes - unlike the STM32L151 series, the STM32L152RBT6A includes a full-featured LCD controller supporting up to 8×40 segments. It provides on-chip step-up converter (VLCD rail), contrast adjustment, blinking mode, and software-controlled bias generation - eliminating need for external LCD bias ICs in portable instrumentation.

How many analog-to-digital converter (ADC) channels does the STM32L152RBT6A support, and what is its resolution and speed?

The device integrates a single 12-bit ADC with up to 24 input channels and 1 Msps sampling rate. It supports hardware oversampling, injected/conversion sequences, and includes built-in temperature sensor and internal voltage reference (VREFINT) - enabling high-accuracy sensor measurements down to 1.8 V supply.

What low-power modes are supported, and what are the typical current draws in each?

Five low-power modes are supported: Run (185 µA/MHz), Low-power Run (10.9 µA), Sleep (16.2 µA), Stop (0.44 µA), and Standby (0.28 µA). All modes retain RAM content except Standby; Stop and Standby support RTC and wakeup pins. Current values are measured at 3.0 V, 25°C, with peripherals disabled per datasheet conditions.