STMicroelectronics STM32L151VBH6A

Overview

STM32L151VBH6A 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 IoT sensors, portable medical monitors, and smart utility meters requiring sub-µA standby operation.

For engineers reviewing the STM32L151VBH6A datasheet, STM32L151VBH6A pinout, STM32L151VBH6A application, or STM32L151VBH6A equivalent, key selection criteria include ultra-low-power mode timing (0.28 µA Standby), integrated USB 2.0 PHY with internal 48 MHz PLL, LCD driver exclusion (per device variant), and 73 I/Os with 5V tolerance - all validated for industrial temperature range (-40°C to +105°C).

Technical Context

The STM32L151VBH6A implements a dynamic voltage scaling architecture enabling five low-power operating modes (Run, Sleep, Low-power Run, Stop, Standby), each with deterministic wakeup latency (< 8 µs from Stop) and configurable peripheral clock gating. Its Cortex-M3 core operates up to 32 MHz with 1.25 DMIPS/MHz performance and includes a memory protection unit (MPU) for secure task isolation.

Clock management integrates six independent sources: HSE (1–24 MHz), LSE (32.768 kHz RTC), HSI (16 MHz ±1%), LSI (37 kHz), MSI (65 kHz–4.2 MHz), and a programmable PLL supporting both CPU and USB 48 MHz clocks. Power supervision includes 5-level BOR, PVD, and POR/PDR with ultra-low-power design targeting <10 nA I/O leakage.

Key Specifications

Pinout & Package

LQFP100 (14 × 14 mm, 0.5 mm pitch) package with 100 leads - compatible with standard PCB assembly processes and thermal management for industrial ambient conditions.

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 STM32L152VBH6A, the STM32L151VBH6A removes LCD hardware to reduce cost and static power, while retaining identical ultra-low-power operation and analog capability; versus STM32L431RCT6, it trades FPU and larger memory for significantly lower quiescent current and embedded EEPROM - making it optimal for long-life, sensor-centric deployments.

Availability

STM32L151VBH6A is available at Aetrix Electronics and suitable for smart utility metering, portable medical monitoring, and industrial wireless sensor nodes requiring stable component supply across extended product lifecycles.

Supply support for STM32L151VBH6A 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, MEMS, and automotive semiconductors since 1987.

The STM32L1 series targets ultra-low-power embedded applications demanding multi-year battery life, robust analog integration, and industrial-grade reliability - optimized for metering, healthcare, and environmental sensing.

FAQ

Does STM32L151VBH6A include an integrated LCD controller?

No. The STM32L151VBH6A excludes the LCD controller present in the STM32L152x6/8/B-A variants. This is explicitly confirmed in Section 3.9 of the datasheet ("LCD (liquid crystal display)" states "except STM32L151x6/8/B-A devices"). The part retains all other peripherals including ADC, DAC, USB, and capacitive sensing.

What is the maximum allowed VDD voltage and its tolerance during transient conditions?

The absolute maximum VDD rating is 4.0 V per Section 6.2 of the datasheet. Operating voltage must remain within 1.65 V to 3.6 V under normal conditions. Transient overvoltage beyond 4.0 V - even briefly - risks permanent damage to I/O structures and internal regulators, and is not supported by ST's reliability testing.

Can the internal 16 MHz HSI oscillator be used directly for USB clock generation?

No. USB 2.0 Full-Speed requires a precise 48 MHz clock with ≤±0.25% tolerance. The HSI (16 MHz ±1%) lacks sufficient accuracy; the datasheet mandates use of the PLL fed by either HSE (1–24 MHz) or MSI (65 kHz–4.2 MHz) to generate the required 48 MHz USB clock, as specified in Section 3.4 and Table 34.

How many pins support capacitive sensing, and what is their physical mapping?

The STM32L151VBH6A supports up to 20 capacitive sensing channels, implemented on GPIO pins PA0–PA7, PB0–PB1, PC0–PC7, and PD0–PD2 (totaling 20 pins), as defined in Section 3.14 and Table 10 of the datasheet. These share alternate function assignments and require specific SYSCFG register configuration to enable CSD mode.