STMicroelectronics STM32L151CCT6

Overview

STM32L151CCT6 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 - deployed in battery-powered medical sensors, portable industrial loggers, and smart utility meters requiring sub-µA standby operation.

For engineers reviewing the STM32L151CCT6 datasheet, STM32L151CCT6 pinout, STM32L151CCT6 application, or STM32L151CCT6 equivalent, key selection criteria include verified 0.29 µA Standby current (3 wakeup pins), 8.6 µA Low-power run mode, 70 I/Os (5V tolerant), USB 2.0 interface with internal 48 MHz PLL, and LCD driver support (excluded in STM32L151xC variants).

Technical Context

The STM32L151CCT6 integrates a Cortex-M3 core running up to 32 MHz with dynamic voltage scaling, memory protection unit (MPU), and multiple low-power modes including Stop (0.44 µA) and Standby (0.29 µA). Its clock system combines HSE (1–24 MHz), LSE (32.768 kHz RTC), HSI (16 MHz ±1%), and MSI (65 kHz–4.2 MHz) sources with a dedicated USB PLL.

Analog subsystem includes two operational amplifiers, two ultra-low-power comparators with window mode and wake-up capability, temperature sensor, VREFINT reference, and hardware-accelerated capacitive sensing (up to 23 channels). The 12-bit ADC supports up to 25 channels with programmable sampling time and analog watchdog.

Key Specifications

Pinout & Package

LQFP64 package: 64-pin low-profile quad flat package, 10 × 10 mm body, 0.5 mm lead pitch, exposed pad optional. Designed for reflow soldering and moderate thermal dissipation in space-constrained embedded systems.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L151CCT6, the STM32L431RCT6 trades EEPROM and ultra-low standby for Cortex-M4F compute density, while the EFM32PG12B500F1024GL125 achieves lower deep-sleep current but sacrifices USB integration and embedded EEPROM - making STM32L151CCT6 optimal for USB-enabled, EEPROM-dependent, battery-constrained applications.

Availability

STM32L151CCT6 is available at Aetrix Electronics and suitable for portable medical devices, smart utility meters, and industrial data loggers requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across temperature ranges (-40 °C to +105 °C).

Supply support for STM32L151CCT6 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 since 1987.

The STM32L1 series targets ultra-low-power embedded applications demanding extended battery life, robust analog integration, and industrial temperature operation - with the STM32L151CCT6 optimized for cost-sensitive, USB-connected, sensor-rich edge devices.

FAQ

Does STM32L151CCT6 support USB device mode without external crystal?

Yes. The STM32L151CCT6 integrates a dedicated USB PLL that can be clocked from the internal 16 MHz HSI RC oscillator (±1% factory-trimmed) or external HSE, eliminating the need for a separate 48 MHz crystal. This reduces BOM cost and PCB layout complexity while maintaining full-speed USB 2.0 compliance.

What is the maximum number of ADC channels usable simultaneously with full 12-bit resolution?

The STM32L151CCT6 supports up to 25 ADC input channels, but simultaneous sampling across all channels is not possible. In practice, up to 16 channels can be configured in sequence with hardware-triggered conversions and DMA transfer, maintaining 12-bit resolution and ≤1 µs conversion time per channel under typical conditions (ADCCLK = 12 MHz).

Is the 8 KB EEPROM truly standalone or emulated in Flash?

The 8 KB EEPROM is implemented as dedicated silicon memory with ECC protection - not emulated in Flash. It supports byte-level writes, 40,000 write/erase cycles minimum, and data retention exceeding 20 years at 85 °C. This enables reliable storage of calibration coefficients, device IDs, and usage counters without wear-leveling software overhead.

Can the STM32L151CCT6 drive an LCD segment display?

No. The STM32L151CCT6 belongs to the STM32L151xC product line, which explicitly excludes the integrated LCD controller. Only STM32L151xR, STM32L151xV, and STM32L151xU variants include the LCD driver supporting up to 8×40 segments. For LCD functionality, select STM32L151RCT6 or equivalent with 'R', 'V', or 'U' suffix.