STMicroelectronics STM32L152R6H6A

Overview

STM32L152R6H6A 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 targets battery-powered portable instrumentation, smart sensors, and energy-harvesting edge nodes.

For engineers reviewing the STM32L152R6H6A datasheet, STM32L152R6H6A pinout, STM32L152R6H6A application, or STM32L152R6H6A equivalent, key selection considerations include standby current (0.28 µA), 12-bit ADC with 24 channels and 1 Msps, dual DAC output buffers, ultra-low-power comparators with wake-up capability, and LCD driver integration - all in LQFP64 package.

Technical Context

The STM32L152R6H6A implements a 32 MHz ARM Cortex-M3 core with MPU, dynamic voltage scaling, and five low-power modes (Run, Sleep, Low-power Run, Stop, Standby) optimized for sub-µA retention. Its clock system integrates HSE (1–24 MHz), LSE (32.768 kHz), HSI (16 MHz ±1%), LSI (37 kHz), and MSI (65 kHz–4.2 MHz), plus a dedicated 48 MHz PLL for USB.

Analog subsystem includes a 12-bit ADC (24 channels, 1 Msps), two buffered 12-bit DACs, two ultra-low-power comparators with window mode and wake-up, and an on-chip temperature sensor. The LCD controller supports up to 8×40 segments with contrast adjustment and on-board step-up converter - exclusive to STM32L152 variants.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad; 51 general-purpose I/Os (45 5V-tolerant), 16 external interrupt lines, and dedicated LCD segment/common pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L152R6H6A, the R8H6A offers identical functionality at potentially higher unit cost, while the STM32L432KCU6 trades LCD/ECC EEPROM for M4F performance and nanoamp standby - making it suitable only when those specific features are unnecessary.

Availability

STM32L152R6H6A is available at Aetrix Electronics and suitable for portable medical sensors, smart utility meters, and industrial wireless nodes requiring stable component supply, long-term lifecycle assurance, and qualified automotive-grade temperature range (-40°C to +105°C).

Supply support for STM32L152R6H6A 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 ICs, sensors, and analog products for industrial, automotive, and consumer markets.

The STM32L1 series targets ultra-low-power embedded applications demanding extended battery life, robust operation across extreme temperatures, and high integration - especially where LCD, EEPROM, and analog precision are critical.

FAQ

Does STM32L152R6H6A include an integrated LCD controller?

Yes. Unlike the STM32L151 series, the STM32L152R6H6A includes a full-featured LCD controller supporting up to 8 commons and 40 segments (320 total), with on-chip step-up converter, contrast adjustment, and blinking mode - eliminating need for external LCD bias circuitry.

What is the maximum operating frequency and associated power consumption?

The STM32L152R6H6A runs at up to 32 MHz using its internal 16 MHz HSI RC oscillator (±1%) with PLL multiplication or external crystal. At 32 MHz in Run mode, typical current is 185 µA/MHz (≈5.92 mA), dropping to 10.9 µA in Low-power Run mode with reduced voltage scaling.

How many I/O pins are 5V-tolerant, and which packages support them?

45 of the 51 GPIOs on the STM32L152R6H6A are 5V-tolerant, enabling direct interfacing with legacy 5V peripherals without level shifters. This applies specifically to the LQFP64 package (H6A suffix), as confirmed in Section 3.6 of the datasheet and Table 9 (pin definitions).

Is the 4 KB EEPROM truly EEPROM or emulated in Flash?

It is true hardware EEPROM - a dedicated memory block with separate erase/write cycles, ECC protection, 100,000 write endurance, and 40-year data retention at 85°C. It is not Flash-emulated; electrical characteristics are specified separately in Table 36 and Table 37 of the datasheet.