STMicroelectronics STM32L152RBT6

Overview

STM32L152RBT6 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 V to 3.6 V across –40°C to +85°C, delivers 214 µA/MHz in Run mode, and supports <8 µs wakeup from Stop mode - ideal for battery-powered medical sensors and portable industrial data loggers.

For engineers reviewing the STM32L152RBT6 datasheet, STM32L152RBT6 pinout, STM32L152RBT6 application, or STM32L152RBT6 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 hardware capacitive touch sensing support for up to 20 channels.

Technical Context

The STM32L152RBT6 implements dynamic voltage scaling and multiple low-power modes (Run, Sleep, Low-power Run, Stop, Standby) with dedicated power domains for analog and digital peripherals. Its clock system integrates five oscillators: HSE (1–24 MHz), LSE (32.768 kHz), HSI (16 MHz ±1%), LSI (37 kHz), and MSI (65 kHz–4.2 MHz), plus a USB PLL generating 48 MHz.

Core peripherals include a 7-channel DMA controller, 10 timers (6 general-purpose 16-bit with PWM/IC/OC), two watchdogs (IWDG/WWDG), and rich analog resources: two ultra-low-power comparators with window mode and wake-up capability, temperature sensor, and internal voltage reference (VREFINT).

Key Specifications

Pinout & Package

LQFP64 package (10 × 10 mm, 0.5 mm pitch), 64-pin quad flat leaded package with exposed thermal pad - optimized for manual soldering, thermal dissipation in space-constrained PCB layouts, and compatibility with standard reflow profiles.

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 STM32L152RBT6, STM32L053R8T6 trades LCD/USB/ECC memory for lower cost and marginally lower Stop current, while STM32L432KCU6 sacrifices ultra-low static power for higher performance and security - making STM32L152RBT6 optimal for display-integrated, battery-constrained applications requiring balanced analog/digital capability.

Availability

STM32L152RBT6 is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and portable diagnostic tools requiring stable component supply across extended product lifecycles.

Supply support for STM32L152RBT6 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 demanding extended battery life, integrated analog peripherals, and robust operation across industrial temperature ranges - with emphasis on medical, metering, and portable HMI systems.

FAQ

Does STM32L152RBT6 support USB device mode only, or can it operate as a USB host?

No, the STM32L152RBT6 integrates a USB 2.0 Full-Speed device-only controller with internal PHY and 1.5 kΩ pull-up on DP. It does not support USB host or OTG functionality. External USB host capability requires companion ICs like the USB3300 or CH375B, or migration to STM32F4/F7 series with USB OTG HS/FS IP.

What is the maximum allowed VDDA voltage relative to VDD, and why does it matter?

VDDA must be equal to or less than VDD, and both must remain within 1.65 V–3.6 V. Exceeding VDDA > VDD risks damaging the ADC, DAC, and comparators due to internal level-shifter stress. This constraint ensures analog accuracy and prevents latch-up in mixed-signal operation - critical when using external references or precision sensor interfaces.

Can the built-in LCD controller drive graphic LCDs or only character/segment types?

The STM32L152RBT6 LCD controller supports only static and multiplexed segment-based displays (up to 8 commons × 40 segments). It lacks graphics RAM, pixel-addressable framebuffer, or SPI/I²C interface for TFT or OLED modules. For graphic LCDs, external controllers (e.g., SSD1306, ST7735) or higher-tier MCUs like STM32F469 are required.

Is the 4 KB EEPROM truly independent of Flash, and how is wear leveling handled?

Yes, the 4 KB EEPROM is a physically separate memory array with dedicated ECC logic and independent write/erase cycles (≥300k endurance). ST's HAL library provides emulated EEPROM drivers that implement software wear leveling across pages, but the hardware EEPROM itself requires no emulation - enabling direct byte-write access and guaranteed 20-year data retention at 85°C.