STMicroelectronics STM32L151VBT6D

Overview

STM32L151VBT6D from STMicroelectronics is an ultra-low-power 32-bit ARM Cortex-M3 microcontroller in LQFP100 package, featuring 128 KB Flash, 16 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 and portable industrial data loggers requiring sub-µA standby operation.

For engineers reviewing the STM32L151VBT6D datasheet, STM32L151VBT6D pinout, STM32L151VBT6D application, or STM32L151VBT6D equivalent, key selection criteria include verified 0.3 µA Standby current, USB 2.0 full-speed interface with internal 48 MHz PLL, RTC + backup registers for time-critical wake-up, and 73 5V-tolerant I/Os supporting capacitive touch sensing across 20 channels.

Technical Context

The STM32L151VBT6D integrates a 32 MHz ARM Cortex-M3 core with MPU, dynamic voltage scaling, and five low-power modes (Run, Sleep, Low-power Run, Stop, Standby) - each with defined current targets and wakeup latency (e.g., <8 µs from Stop). Its clock system combines HSE (1–24 MHz), LSE (32.768 kHz), HSI (16 MHz ±1%), LSI (37 kHz), and MSI (65 kHz–4.2 MHz) sources, plus a USB-capable PLL.

Analog subsystem includes two ultra-low-power comparators with window mode and wake-up capability, temperature sensor, VREFINT reference, and LCD driver circuitry (excluded in STM32L151x variants per datasheet Section 3.9). Memory protection unit (MPU), CRC engine, and 96-bit unique ID support secure firmware execution and traceability.

Key Specifications

Pinout & Package

LQFP100 (14 × 14 mm, 0.5 mm pitch) package with exposed thermal pad - optimized for thermal dissipation in compact industrial PCB layouts and compatible with standard reflow profiles.

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 STM32L151VBT6D, STM32L071VBT6 sacrifices USB and analog output for lower cost and smaller die size, while STM32L431VCT6 trades ultra-low-power efficiency for Cortex-M4F performance and expanded memory - making the L151 optimal for USB-connected, analog-rich, battery-limited applications where sub-µA sleep is non-negotiable.

Availability

STM32L151VBT6D is available at Aetrix Electronics and suitable for portable medical sensors, industrial data loggers, smart utility meters, and capacitive touch HMIs requiring stable component supply across long-lifecycle deployments.

Supply support for STM32L151VBT6D 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 - specifically engineered for battery-operated and energy-harvesting systems where multi-year autonomy, analog integration, and secure firmware execution are critical design requirements.

FAQ

Does STM32L151VBT6D support USB device mode without external crystal?

Yes. The STM32L151VBT6D integrates an internal 48 MHz PLL that can lock to the HSE (1–24 MHz) or MSI oscillator, enabling full-speed USB 2.0 device operation without requiring a separate 48 MHz crystal. This is confirmed in Section 3.4 (Clock management) and Table 33 (PLL characteristics) of the datasheet.

What is the maximum number of I/Os usable as capacitive sensing channels?

The STM32L151VBT6D supports up to 20 capacitive sensing channels, as stated in the "Features" section (page 1) and Section 3.14 (Touch sensing). These channels are implemented via the CSD (Capacitive Sensing Driver) peripheral and can be assigned to GPIO pins configured in specific alternate functions - not all 83 I/Os are eligible.

Is the 4 KB EEPROM truly independent of Flash memory?

Yes. The 4 KB "true EEPROM" is a physically separate memory block with dedicated erase/write circuitry, distinct from Flash. It supports byte/word programming, >300,000 write cycles, and >20-year data retention at 85°C - verified in Table 35 and Section 3.7 (Memories) of the datasheet, unlike Flash-emulated EEPROM solutions.

Can the STM32L151VBT6D operate reliably at 3.6 V supply with full 32 MHz CPU clock?

Yes. The device is rated for 1.65 V to 3.6 V operation across the full -40°C to +85°C temperature range (Section 6.3.1), and Table 4 confirms 32 MHz maximum CPU frequency is supported at VDD ≥ 2.4 V - thus fully valid at 3.6 V with margin for ripple and transient drop.