STMicroelectronics STM32L151CCT7TR

Overview

STM32L151CCT7TR 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, 12-bit ADC (1 Msps, 25 channels), and dual 12-bit DACs with output buffers. It operates from 1.65 V to 3.6 V across –40 °C to +105 °C and targets battery-powered IoT sensors and portable medical devices requiring long runtime and integrated analog precision.

For engineers reviewing the STM32L151CCT7TR datasheet, STM32L151CCT7TR pinout, STM32L151CCT7TR application, or STM32L151CCT7TR equivalent, key selection criteria include standby current (0.29 µA), RTC-enabled stop mode (1.4 µA), 70 I/Os (5V-tolerant), USB 2.0 interface with internal 48 MHz PLL, and LCD driver exclusion per device variant (not present in STM32L151xC).

Technical Context

The STM32L151CCT7TR implements dynamic voltage scaling and multiple low-power modes-Standby (0.29 µA), Stop + RTC (1.4 µA), and Low-power Run (8.6 µA)-with sub-8 µs wakeup. Its Cortex-M3 core runs up to 32 MHz (1.25 DMIPS/MHz) and includes a memory protection unit (MPU) for secure firmware partitioning.

Analog subsystem integration includes two operational amplifiers, two ultra-low-power comparators (with window mode and wake-up capability), and a temperature sensor with calibrated VREFINT reference. Clock architecture supports external 1–24 MHz crystal, 32 kHz RTC oscillator, and factory-trimmed 16 MHz HSI RC (±1%) for rapid startup without external components.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad - optimized for compact PCB layouts and thermal dissipation in space-constrained embedded modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L151CCT7TR, the STM32L431RCT6 trades ultra-low-power efficiency for computational headroom and FPU support, while the EFM32PG12B500F1024GL125 achieves deeper sleep at the expense of integrated USB and EEPROM-making the STM32L151CCT7TR optimal for USB-connected, calibration-critical, battery-operated devices.

Availability

STM32L151CCT7TR is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and portable diagnostic instruments requiring stable component supply across extended product lifecycles.

Supply support for STM32L151CCT7TR 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 targets ultra-low-power embedded applications demanding extended battery life, integrated analog functionality, and industrial-grade reliability-specifically engineered for IoT edge nodes, portable medical equipment, and energy-metering systems.

FAQ

Does STM32L151CCT7TR include an LCD controller?

No. The STM32L151CCT7TR belongs to the STM32L151xC family, which explicitly excludes the LCD driver peripheral. Only STM32L15xRC, STM32L15xUC, and STM32L15xVC variants integrate the 8×40 segment LCD controller. This omission reduces die size and power consumption for applications not requiring display output.

What is the maximum operating frequency with guaranteed timing at 1.8 V supply?

At 1.8 V supply, the STM32L151CCT7TR supports a maximum CPU frequency of 16 MHz, as defined by Dynamic Voltage Scaling (DVS) Level 1 in the datasheet (Section 4.3.2). Higher frequencies (up to 32 MHz) require ≥2.4 V supply to meet timing specifications across temperature and process corners.

How many independent DMA channels does STM32L151CCT7TR support?

The STM32L151CCT7TR integrates a 12-channel DMA controller supporting memory-to-memory, peripheral-to-memory, and memory-to-peripheral transfers. Each channel is independently configurable for priority, data width, address increment, and transfer count-enabling concurrent ADC sampling, USB packet buffering, and SPI sensor reads without CPU intervention.

Is the internal 16 MHz HSI oscillator factory-trimmed and usable for USB clock generation?

Yes. The HSI oscillator is factory-trimmed to ±1% accuracy and can feed the internal PLL to generate the precise 48 MHz clock required for USB Full-Speed operation. This eliminates the need for an external 48 MHz crystal or oscillator, reducing bill-of-materials cost and PCB footprint in USB-enabled designs.