STMicroelectronics STM32L152VBT6

Overview

STM32L152VBT6 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, integrated LCD controller (up to 8×40 segments), USB 2.0 interface, and dual 12-bit DACs. It operates from 1.65–3.6 V across -40°C to +85°C and targets battery-powered medical sensors, portable meters, and smart wearables requiring sub-µA standby current.

For engineers reviewing the STM32L152VBT6 datasheet, STM32L152VBT6 pinout, STM32L152VBT6 application, or STM32L152VBT6 equivalent, key selection criteria include its 0.3 µA Standby mode (3 wakeup pins), 12-bit 1 Msps ADC with up to 24 channels, 9 µA Low-power run mode, and hardware LCD driver with on-board step-up converter - all critical for energy-constrained embedded designs.

Technical Context

The STM32L152VBT6 implements dynamic voltage scaling and multiple low-power modes (Stop, Standby, Low-power Run) managed by an ultra-safe BOR with five threshold levels and programmable voltage detector (PVD). Its clock system integrates a 32 kHz RTC oscillator with calibration, 16 MHz HSI RC (+/-1%), and a 48 MHz PLL dedicated to USB timing.

Core peripherals include a 7-channel DMA controller, 10 timers (6x 16-bit general-purpose with PWM/IC/OC), two ultra-low-power comparators with window mode and wake-up capability, and capacitive sensing supporting up to 20 channels for touchkey and rotary sensors - enabling direct integration of human interface functions without external components.

Key Specifications

Pinout & Package

LQFP100 package (14 × 14 mm, 0.5 mm pitch), RoHS-compliant, with 83 fast I/Os (73 I/Os 5V tolerant) mappable to 16 external interrupt vectors and full SWD/JTAG debug support.

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 STM32L152VBT6, STM32L072VBT6 trades LCD/DAC/ECC EEPROM for lower standby current and simpler BOM, while STM32L432KCU6 replaces LCD and EEPROM with FPU and faster ADC - making each optimal for distinct subsystem roles in ultra-low-power architectures.

Availability

STM32L152VBT6 is available at Aetrix Electronics and suitable for portable medical devices, utility metering systems, and industrial handheld testers requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for STM32L152VBT6 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 was engineered specifically for ultra-low-power battery-operated applications demanding extended runtime, integrated analog peripherals, and robust memory reliability - targeting medical, metering, and wearable markets.

FAQ

Does STM32L152VBT6 support USB device mode only, or can it operate as a USB host?

No, the STM32L152VBT6 integrates a full-speed USB 2.0 device-only controller with on-chip transceivers and 1.5 kΩ pull-up resistor. It does not support USB host or OTG functionality. External USB host capability requires companion ICs such as the USB3300 or MAX3421E, connected via SPI or parallel interface.

What is the maximum operating frequency when running from internal 16 MHz HSI RC oscillator?

The internal 16 MHz HSI RC oscillator is factory-trimmed to ±1% accuracy and supports full 32 MHz CPU operation when used with the PLL (×2 multiplication). Without PLL, the HSI directly clocks the system at 16 MHz - sufficient for most low-power applications where timing precision is less critical than power savings.

How many I/O pins are 5V tolerant, and under what conditions?

73 of the 83 GPIOs on the STM32L152VBT6 are 5V tolerant when VDD is powered (1.65–3.6 V) and the input voltage does not exceed VDD + 4 V. This tolerance applies only to pins configured as inputs or outputs in push-pull mode - open-drain mode disables 5V tolerance. Pins PA13/PA14/SWDIO/SWCLK are not 5V tolerant.

Is the 4 KB EEPROM truly independent of Flash, and how is endurance specified?

Yes, the 4 KB data EEPROM is implemented as a separate memory array with dedicated ECC logic and independent erase/write cycles. ST specifies 400,000 write/erase cycles and 20-year data retention at 55°C - verified per JEDEC JESD22-A117. Each byte can be rewritten individually without erasing adjacent locations.