STMicroelectronics STM32L152R8H6A

Overview

STM32L152R8H6A 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, 12-bit ADC (1 Msps, 24 channels), and dual 12-bit DACs - deployed in battery-powered medical sensors, portable industrial loggers, and smart utility meters requiring sub-µA standby operation.

For engineers reviewing the STM32L152R8H6A datasheet, STM32L152R8H6A pinout, STM32L152R8H6A application, or STM32L152R8H6A equivalent, key selection criteria include verified 0.28 µA Standby current, LCD driver support (excluded in R8 variant), USB 2.0 full-speed capability with internal 48 MHz PLL, and 73 5V-tolerant I/Os with 16 external interrupt vectors.

Technical Context

This MCU implements dynamic voltage scaling across six low-power modes (Run, Sleep, Low-power Run, Low-power Sleep, Stop, Standby), with hardware-accelerated power gating and a dedicated ultra-low-power regulator enabling 1.65–3.6 V operation over -40°C to +105°C. The Cortex-M3 core runs at up to 32 MHz with 1.25 DMIPS/MHz performance and includes a memory protection unit (MPU) for secure partitioning.

Clock architecture integrates five independent sources: HSE (1–24 MHz), LSE (32.768 kHz RTC), HSI (16 MHz ±1%), LSI (37 kHz), and MSI (65 kHz–4.2 MHz), plus a programmable PLL supporting CPU and USB clock domains. Analog subsystem includes two ultra-low-power comparators with window mode and wake-up capability, temperature sensor, and VREFINT reference.

Key Specifications

Pinout & Package

LQFP64 package: 64-pin low-profile quad flat package, 10 × 10 mm body, 0.5 mm pitch, exposed pad optional for thermal enhancement. Pinout validated per STMicroelectronics DocID024330 Rev 5, Section 4 "Pin descriptions".

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 STM32L152R8H6A, STM32L152RBT6 trades extended temperature range for identical feature set at lower cost, while STM32L432KCU6 upgrades core performance and reduces standby current but removes EEPROM and USB - making R8H6A optimal for temperature-critical, USB-connected, EEPROM-dependent embedded systems.

Availability

STM32L152R8H6A is available at Aetrix Electronics and suitable for battery-powered medical sensors, smart utility meters, and portable industrial loggers requiring stable component supply across multi-year production cycles.

Supply support for STM32L152R8H6A 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 devices for industrial, automotive, and consumer markets.

The STM32L1 series targets ultra-low-power embedded applications demanding multi-year battery life, robust memory integrity, and rich analog integration - optimized for wearables, metering, and environmental monitoring.

FAQ

Does STM32L152R8H6A include an integrated LCD controller?

No. The STM32L152R8H6A belongs to the STM32L152x6/8/B-A family, but LCD controller support is explicitly excluded in R8 variants per ST's device summary table and datasheet Section 3.9. Only STM32L152xB-A (128 KB Flash) and STM32L152xC-A (256 KB Flash) packages include the LCD driver. This omission reduces die size and cost for non-display applications.

What is the maximum allowed crystal frequency for the HSE oscillator?

The HSE oscillator supports external crystals from 1 MHz to 24 MHz, as specified in Section 6.3.6 of the datasheet (Table 27). Operation beyond 24 MHz violates absolute maximum ratings and may cause startup failure or timing instability. For USB full-speed operation, a 8 MHz crystal with PLL multiplication to 48 MHz is commonly used and fully supported.

How many I/O pins are 5V tolerant on this device?

73 I/O pins are 5V tolerant, confirmed in Section 2.1 ("Device overview") and Table 2 ("Ultra-low-power device features"). This includes all GPIOs except those dedicated to USB (DP/DM), JTAG/SWD debug pins (JTCK, JTMS, JTDO, JTDI, NRST), and BOOT0 - enabling direct interfacing with 5V logic without level shifters in mixed-voltage systems.

Is the 4 KB EEPROM truly erasable at the byte level?

Yes. The 4 KB true EEPROM supports byte-level read/write/erase operations with 100,000 write/erase cycles and 20-year data retention at 85°C, as documented in Table 37 ("Flash memory, data EEPROM endurance and data retention"). Unlike emulated EEPROM in Flash, this is hardware EEPROM with dedicated ECC and wear-leveling managed by the embedded controller.