STMicroelectronics STM32L151VCH6TR

Overview

STM32L151VCH6TR from STMicroelectronics is an ultra-low-power 32-bit ARM® Cortex®-M3 microcontroller featuring 256 KB Flash, 32 KB SRAM, 8 KB EEPROM with ECC, integrated LCD controller (up to 8×40 segments), and USB 2.0 interface with internal 48 MHz PLL. It operates from 1.65 V to 3.6 V across –40 °C to +105 °C and delivers 1.25 DMIPS/MHz performance - deployed in battery-powered medical sensors and portable industrial HMI displays.

For engineers reviewing the STM32L151VCH6TR datasheet, STM32L151VCH6TR pinout, STM32L151VCH6TR application, or STM32L151VCH6TR equivalent, key selection criteria include standby current (0.29 µA), 12-bit ADC (1 Msps, 25 channels), dual 12-bit DACs with buffers, ultra-low-power comparators with wake-up capability, and 70 5V-tolerant I/Os mappable to 16 external interrupt vectors.

Technical Context

The STM32L151VCH6TR implements dynamic voltage scaling and multiple low-power modes (Stop, Standby, Low-power Run) with sub-µA retention states and 8 µs wake-up latency. Its Cortex-M3 core supports MPU, Thumb-2 instruction set, and deterministic interrupt handling with NVIC supporting up to 83 fast I/Os.

On-chip clock system includes factory-trimmed 16 MHz HSI (±1%), 32 kHz LSE for RTC calibration, and a programmable PLL generating CPU and USB clocks. Analog subsystem integrates two operational amplifiers, two ultra-low-power comparators, 12-bit ADC with temperature sensor/VREFINT, and dual buffered 12-bit DACs - all functional down to 1.8 V supply.

Key Specifications

Pinout & Package

LQFP100 package (14 × 14 mm, 0.5 mm pitch) with exposed thermal pad; RoHS-compliant, industrial temperature grade (–40 °C to +105 °C).

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 STM32L152VCH6TR, the STM32L151VCH6TR omits crypto acceleration but retains identical analog/peripheral feature set and EEPROM - making it optimal for cost-sensitive, non-secure HMI and metering applications. Versus STM32L431VCT6, it trades FPU and ultra-low standby for built-in LCD and EEPROM - critical for display-centric, data-logging edge nodes.

Availability

STM32L151VCH6TR is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial panel controllers, and portable gas detectors requiring stable component supply across extended product lifecycles.

Supply support for STM32L151VCH6TR 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 extended battery life, robust analog integration, and industrial-grade reliability - especially in portable instrumentation, energy metering, and wireless sensor networks.

FAQ

What is the maximum operating frequency and core type of the STM32L151VCH6TR?

The STM32L151VCH6TR features an ARM Cortex-M3 32-bit core with a maximum CPU frequency of 32 MHz. It achieves 1.25 DMIPS/MHz (Dhrystone 2.1) and includes a Memory Protection Unit (MPU) for enhanced software reliability. The core supports Thumb-2 instruction set and nested vectored interrupt controller (NVIC) with up to 83 GPIOs mapped to 16 external interrupt lines.

Does the STM32L151VCH6TR support USB functionality, and what are its requirements?

Yes, the STM32L151VCH6TR integrates a full-speed USB 2.0 device interface with an internal 48 MHz PLL for clock generation. It requires only the differential pair (USB_DP/USB_DM) and a 1.5 kΩ pull-up resistor on DP - no external PHY or crystal needed. The USB peripheral supports CDC, HID, and MSC classes and is accessible via the embedded bootloader over USB or USART.

How does the STM32L151VCH6TR manage ultra-low-power operation in battery-powered systems?

The device offers five low-power modes: Run, Sleep, Low-power Run, Stop, and Standby - with current consumption as low as 0.29 µA in Standby (3 wakeup pins) and 0.44 µA in Stop (16 wakeup lines). It includes a 32 kHz RTC with calibration, ultra-low-leakage I/Os (10 nA), and 8 µs wake-up time. Dynamic voltage scaling adjusts core voltage based on frequency to minimize active power.

What analog peripherals are integrated into the STM32L151VCH6TR, and how are they used in sensor applications?

The MCU integrates a 12-bit ADC (1 Msps, 25 channels), two 12-bit DACs with output buffers, two operational amplifiers, two ultra-low-power comparators, temperature sensor, and internal voltage reference (VREFINT). These enable end-to-end analog signal chains - e.g., op-amps condition sensor outputs, ADC digitizes them, comparators trigger wake-up on threshold breach, and DACs drive analog actuators - all without external components.