STMicroelectronics STM32L151RCT6

Overview

STM32L151RCT6 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. It operates from 1.65–3.6 V across –40 °C to +105 °C and supports USB 2.0, LCD driver (excluded in RCT6 variant), and capacitive touch sensing - deployed in battery-powered medical sensors and portable industrial data loggers.

For engineers reviewing the STM32L151RCT6 datasheet, STM32L151RCT6 pinout, STM32L151RCT6 application, or STM32L151RCT6 equivalent, key selection criteria include standby current (0.29 µA), RTC-enabled stop mode (1.4 µA), 8.6 µA low-power run mode, 16 MHz factory-trimmed HSI accuracy (±1%), and 70 I/Os with 5V tolerance - all critical for energy-constrained embedded designs requiring mixed-signal integration and long-term firmware reliability.

Technical Context

The STM32L151RCT6 implements dynamic voltage scaling (DVS) to optimize power vs. performance across five low-power modes: Run, Sleep, Low-power Run, Stop, and Standby - each with distinct peripheral availability and wakeup latency (e.g., 8 µs from Stop). Its Cortex-M3 core runs at up to 32 MHz with MPU, supporting deterministic real-time execution and memory protection for certified firmware deployments.

On-chip clock architecture includes three independent oscillators: 1–24 MHz HSE, 32.768 kHz LSE (RTC-calibrated), and 16 MHz HSI (±1% factory-trimmed), plus a multispeed internal RC (MSI) and PLL generating 48 MHz for USB. Power management integrates BOR with five thresholds, PVD, and ultra-low-leakage (10 nA) I/Os to sustain operation in intermittent power environments.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad - optimized for compact industrial PCBs requiring reflow compatibility and thermal dissipation in sealed enclosures.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L151RCT6, the STM32L431RCT6 trades EEPROM and ultra-low standby for FPU-enhanced compute density, while the EFM32PG12B500F1024GL125 achieves deeper sleep at the cost of USB integration - making the RCT6 optimal for USB-enabled, EEPROM-dependent, battery-operated systems needing balanced performance and minimal quiescent draw.

Availability

STM32L151RCT6 is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and portable diagnostic tools requiring stable component supply across extended production lifecycles.

Supply support for STM32L151RCT6 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-grade components since 1987.

The STM32L1 series targets ultra-low-power embedded applications demanding extended battery life, robust memory integrity, and integrated analog peripherals - specifically engineered for environmental sensors, portable medical devices, and energy-harvesting systems.

FAQ

Does STM32L151RCT6 include an integrated LCD controller?

No. The STM32L151RCT6 belongs to the "R" density variant (LQFP64), which excludes the LCD controller per ST's device summary table. Only STM32L151xC (LQFP100) and STM32L151xV (LQFP100/UFBGA100) packages include the 8×40-segment LCD driver. This omission reduces die size and cost for applications not requiring segmented displays.

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

At 1.8 V, the STM32L151RCT6 supports a maximum CPU frequency of 16 MHz, as defined by Dynamic Voltage Scaling (DVS) Level 2 in Section 4.3.1 of the datasheet. Higher frequencies (up to 32 MHz) require ≥2.4 V supply to meet internal timing constraints and maintain SRAM/Flash access integrity.

How many I/O pins support 5V tolerance, and are they configurable per-pin?

70 I/O pins are 5V tolerant, covering all GPIOs except those dedicated to USB (DP/DM), oscillator inputs (OSC_IN/OSC_OUT), and BOOT0. Tolerance is inherent to the I/O structure - no register configuration is needed. However, 5V operation requires VDD ≥ 2.0 V and adherence to absolute maximum ratings in Table 11.

Is the 8 KB EEPROM truly erasable at byte-level, and what is its endurance?

Yes. The 8 KB EEPROM supports byte, half-word, and word erase/write operations with guaranteed 400,000 write/erase cycles and 20-year data retention at 55 °C (Section 6.3.36). ECC is applied automatically during all accesses, correcting single-bit errors and detecting double-bit failures to prevent silent corruption.