STMicroelectronics STM32L151CCT6TR

Overview

STM32L151CCT6TR from STMicroelectronics is an ultra-low-power 32-bit ARM® Cortex®-M3 microcontroller in LQFP64 package, featuring 256KB Flash, 32KB SRAM, 8KB 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 sensor nodes requiring long runtime and integrated analog signal conditioning.

For engineers reviewing the STM32L151CCT6TR datasheet, STM32L151CCT6TR pinout, STM32L151CCT6TR application, or STM32L151CCT6TR equivalent, key selection criteria include ultra-low-power Stop mode current (0.44 µA), 8 µs wakeup time, USB 2.0 interface with internal 48 MHz PLL, and capacitive touch sensing support up to 23 channels.

Technical Context

This MCU implements dynamic voltage scaling and multiple low-power modes (Stop, Standby, Low-power Run) with hardware-accelerated power state transitions. Its memory protection unit (MPU) enforces privilege separation, while the embedded 32 kHz RTC oscillator supports calendar functions with ±1 ppm calibration accuracy.

The analog subsystem integrates two operational amplifiers, two ultra-low-power comparators (with window mode and wake-up capability), and a temperature sensor with factory-calibrated coefficients. The USB peripheral uses an internal PLL for 48 MHz clock generation without external crystal, reducing BOM count.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package 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 microcontroller applications.

Compared with STM32L151CCT6TR, the STM32L431RCT6 trades EEPROM and ultra-low-power analog features for higher compute density, while the EFM32PG12B500F1024GL125 achieves deeper sleep at the expense of USB integration and mixed-signal peripheral breadth.

Availability

STM32L151CCT6TR is available at Aetrix Electronics and suitable for smart utility meters, wearable health monitors, industrial wireless sensor nodes, and asset tracking beacons requiring stable component supply and long-term manufacturability.

Supply support for STM32L151CCT6TR 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-grade components.

The STM32L1 series targets ultra-low-power embedded applications demanding extended battery life, integrated analog functionality, and industrial-grade reliability across wide temperature ranges.

FAQ

Does STM32L151CCT6TR support USB device mode without an external crystal?

Yes. The MCU integrates a 48 MHz PLL fed by its internal high-speed RC oscillator (HSI), enabling full-speed USB 2.0 device operation without requiring an external 48 MHz crystal or oscillator. This reduces bill-of-materials cost and PCB layout complexity while maintaining USB compliance.

What is the maximum number of capacitive sensing channels supported?

The STM32L151CCT6TR supports up to 23 capacitive sensing channels using its built-in touch sensing controller (TSC). These channels can be configured for proximity, slider, or matrix keypad operation with hardware-accelerated acquisition and noise filtering, eliminating the need for external touch ICs.

How does the embedded EEPROM differ from standard Flash memory in practice?

The 8 KB true EEPROM provides byte-level erase/write capability with 400 kcycle endurance and 20-year data retention at 85 °C - unlike Flash, which requires sector erasure and has lower endurance. It is accessed via standard memory-mapped reads/writes and protected by ECC, making it ideal for storing infrequently updated calibration data.

Can the internal temperature sensor be used for system thermal monitoring?

Yes. The factory-calibrated temperature sensor delivers ±1.5 °C accuracy from –40 °C to 125 °C and connects directly to ADC channel 16. Its output is linear over temperature, and calibration coefficients stored in system memory allow software to compute absolute die temperature with minimal overhead.