STMicroelectronics STM32L152R6H6

Overview

STM32L152R6H6 from STMicroelectronics is an ultra-low-power 32-bit ARM® Cortex®-M3 microcontroller featuring 32 MHz max CPU frequency, 128 KB Flash with ECC, 16 KB SRAM, 4 KB true EEPROM with ECC, and integrated USB 2.0 interface. It delivers 1.25 DMIPS/MHz performance and supports 0.57 µA Stop mode (16 wakeup lines), making it suitable for battery-powered IoT sensor nodes requiring long runtime and secure firmware storage.

For engineers reviewing the STM32L152R6H6 datasheet, STM32L152R6H6 pinout, STM32L152R6H6 application, or STM32L152R6H6 equivalent, key selection criteria include ultra-low-power operating modes (Stop/Standby), dual 12-bit DACs with output buffers, 12-bit ADC with up to 24 channels, LCD driver support (excluded in R6 variant), and USB 2.0 compliance with internal 48 MHz PLL.

Technical Context

The STM32L152R6H6 implements a full-featured Cortex-M3 core with Memory Protection Unit (MPU), dynamic voltage scaling across multiple low-power modes, and hardware-accelerated cryptographic primitives including CRC calculation unit and 96-bit unique ID. Its clock system integrates five independent sources: HSE (1–24 MHz), LSE (32.768 kHz), HSI (16 MHz ±1%), LSI (37 kHz), and MSI (65 kHz–4.2 MHz), enabling precise RTC operation and fast wake-up from Stop mode (<8 µs).

Analog subsystem includes two 12-bit DACs with output buffers, a 12-bit 1 Msps ADC supporting up to 24 channels, two ultra-low-power comparators with window mode and wake-up capability, and internal temperature sensor/VREFINT. Communication interfaces comprise one USB 2.0 port, three USARTs (with ISO 7816/IrDA), two SPIs (16 Mbit/s), and two I²Cs (SMBus/PMBus).

Key Specifications

Pinout & Package

LQFP64 package: 64-pin low-profile quad flat package, 10 × 10 mm body, 0.5 mm pitch, exposed pad for thermal dissipation. Pin count and I/O mapping align with STM32L152x6 series specification per ST DocID17659 Rev 12 Section 4.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L152R6H6, STM32L432KC offers higher compute throughput at the cost of EEPROM functionality, while EFM32PG12B500F1024GL125 provides superior deep-sleep efficiency and memory scale but omits USB - trade-offs center on firmware persistence, connectivity needs, and power budget constraints.

Availability

STM32L152R6H6 is available at Aetrix Electronics and suitable for smart utility metering, wearable health monitors, industrial sensor nodes, and asset tracking beacons requiring stable component supply across extended production lifecycles.

Supply support for STM32L152R6H6 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, secure firmware execution, and rich analog integration - optimized for metering, portable medical, and environmental monitoring systems.

FAQ

Does STM32L152R6H6 support USB device mode without external crystal?

Yes. The part integrates an internal 48 MHz PLL fed by the HSE or MSI oscillator, enabling full-speed USB 2.0 device operation without requiring an external 48 MHz crystal. USB_DP and USB_DM pins connect directly to the USB connector with appropriate ESD protection and series resistors per ST AN4871 guidelines.

What is the maximum number of 5V-tolerant I/Os on STM32L152R6H6?

73 I/Os are 5V-tolerant, covering all GPIO pins except those dedicated to analog functions (e.g., VREF+, VREF−, VBAT, VDDA, VSSA) and USB signals. This allows direct interfacing with legacy 5V peripherals without level shifters, reducing system complexity in mixed-voltage designs.

How does the 4 KB EEPROM differ from standard Flash memory in this MCU?

The 4 KB EEPROM is implemented as a dedicated memory block with hardware wear-leveling, 100 k-cycle endurance, and guaranteed 40-year data retention at 85°C - unlike Flash, which requires software-managed emulation for EEPROM-like behavior. It supports byte-write operations and ECC protection independently of main Flash.

Can the STM32L152R6H6 drive an LCD segment display?

No. LCD driver support is excluded in the 'R6' variant per ST documentation (Section 2.1, Table 1). Only STM32L152xB and STM32L152xC packages include the LCD controller. For segment-based displays, designers must use external drivers or select STM32L152RB/VB variants instead.