STMicroelectronics STM32L151R6H6A

Overview

STM32L151R6H6A 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 monitors, and smart utility meters requiring sub-µA standby operation.

For engineers reviewing the STM32L151R6H6A datasheet, STM32L151R6H6A pinout, STM32L151R6H6A application, or STM32L151R6H6A equivalent, key selection criteria include verified 0.28 µA Standby current, 10.9 µA Low-power Run mode, USB 2.0 full-speed support with internal 48 MHz PLL, and 73 5V-tolerant I/Os with 16 external interrupt vectors.

Technical Context

The device implements a Cortex-M3 core operating from 32 kHz to 32 MHz with 1.25 DMIPS/MHz performance and integrated Memory Protection Unit (MPU). It supports dynamic voltage scaling across six power modes - including Stop mode (0.44 µA) and Standby mode (0.28 µA) - with hardware-accelerated wakeup in under 8 µs.

Clock architecture includes multiple sources: 1–24 MHz HSE crystal, 32 kHz LSE for RTC calibration, 16 MHz HSI RC (±1%), and programmable PLL for CPU/USB clock generation. Analog subsystem integrates two ultra-low-power comparators with window mode and wake-up capability, alongside temperature sensor and VREFINT reference.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with 64 leads; RoHS-compliant, industrial temperature range (−40°C to +105°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L151R6H6A, STM32L071RBT6 reduces BOM cost and footprint but sacrifices EEPROM reliability and dual DAC precision; STM32L431RCT6 adds FPU and memory headroom at the expense of verified sub-µA standby and analog feature parity.

Availability

STM32L151R6H6A is available at Aetrix Electronics and suitable for portable medical sensors, smart utility meters, and industrial wireless nodes requiring stable component supply across extended product lifecycles.

Supply support for STM32L151R6H6A 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-grade components since 1987.

This device belongs to the STM32L1 ultra-low-power MCU product line, engineered specifically for energy-constrained applications demanding multi-year battery life, robust memory integrity, and integrated analog functionality without external support components.

FAQ

Does STM32L151R6H6A include an integrated LCD controller?

No. The STM32L151R6H6A is part of the STM32L151x6/8/B-A series, which explicitly excludes the LCD driver block per ST's device summary table. Only STM32L152 variants integrate the 8×40-segment LCD controller with on-board step-up converter and contrast adjustment.

What is the maximum operating frequency and associated power consumption in Run mode?

The STM32L151R6H6A operates up to 32 MHz. At 32 MHz with code executing from Flash, typical current consumption is 185 µA/MHz - resulting in ~5.92 mA total. This value assumes VDD = 3.3 V, all peripherals disabled, and no I/O switching activity.

How many external interrupt lines does this MCU support in Stop mode?

The device supports 16 wakeup lines from Stop mode, mapped across GPIO ports (PA–PE) and select peripheral events (RTC alarm, comparator output, USB wakeup). These are configurable via EXTI registers and retain state during Stop entry/exit.

Is the USB interface fully self-contained without external components?

Yes. The USB 2.0 full-speed interface uses internal 48 MHz PLL clocking and integrated transceiver circuitry. Only standard USB D+/D− routing and ESD protection (recommended but not mandatory) are required - no external PHY, resistors, or crystal needed for basic enumeration.