STMicroelectronics STM32L151RCY6TR

Overview

STM32L151RCY6TR from STMicroelectronics is an ultra-low-power 32-bit Arm® Cortex®-M3 microcontroller with 256 KB Flash, 32 KB SRAM, 8 KB EEPROM, integrated USB 2.0 interface, 12-bit ADC (1 Msps, up to 40 channels), and dual 12-bit DACs. It operates from 1.65–3.6 V across –40°C to +105°C and delivers 1.25 DMIPS/MHz performance. It targets battery-powered portable medical devices requiring precise analog sensing and long-term data logging.

For engineers reviewing the STM32L151RCY6TR datasheet, STM32L151RCY6TR pinout, STM32L151RCY6TR application, or STM32L151RCY6TR equivalent, key selection criteria include standby current (305 nA), RTC-enabled stop mode (1.35 µA), 102 5V-tolerant I/Os, LCD driver support (excluded in RC variant), and USB 2.0 compliance with internal 48 MHz PLL.

Technical Context

This MCU implements dynamic voltage scaling and multiple low-power modes-standby (305 nA), stop + RTC (1.35 µA), and low-power run (11 µA)-to optimize energy per computation cycle. Its memory subsystem includes ECC-protected 256 KB Flash, 32 KB SRAM, and 8 KB true EEPROM for robust firmware and parameter storage.

The analog subsystem integrates two operational amplifiers, two ultra-low-power comparators with window mode and wake-up capability, a 12-bit ADC with 40-channel multiplexing, and two buffered 12-bit DACs-enabling closed-loop sensor signal conditioning without external components.

Key Specifications

Pinout & Package

STM32L151RCY6TR is housed in a WLCSP64 (0.4 mm pitch) package measuring 3.13 × 3.13 mm, optimized for ultra-compact wearable and implantable electronics. The package supports solder reflow per JEDEC J-STD-020 and features 64 I/O terminals with defined ball assignments for power, ground, analog, digital, and debug functions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L151RCY6TR, STM32L431RCY6TR trades ultra-low-power analog integration for computational headroom, while EFM32PG12B500F1024GL125 sacrifices USB and DACs to achieve deeper sleep-making STM32L151RCY6TR uniquely balanced for compact, battery-powered medical devices requiring both precision analog I/O and wired connectivity.

Availability

STM32L151RCY6TR is available at Aetrix Electronics and suitable for portable ECG monitors, wireless glucose meters, smart inhaler trackers, and implantable neurostimulator controllers requiring stable component supply across extended product lifecycles.

Supply support for STM32L151RCY6TR 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 in healthcare, wearables, and industrial sensing-emphasizing energy-per-instruction efficiency, integrated analog peripherals, and long-term reliability under constrained thermal and power budgets.

FAQ

Does STM32L151RCY6TR support USB device mode without external crystal?

Yes. STM32L151RCY6TR integrates an internal 48 MHz PLL fed by its 16 MHz HSI oscillator (±1% factory-trimmed), enabling full-speed USB 2.0 device operation without requiring an external 48 MHz crystal or oscillator. This reduces BOM cost and PCB area in space-constrained medical devices.

What is the maximum operating temperature for STM32L151RCY6TR in continuous run mode?

The device is rated for continuous operation from –40°C to +105°C ambient temperature across all supply voltages (1.65–3.6 V). Electrical characteristics-including ADC accuracy, DAC linearity, and Flash write endurance-are guaranteed over this full range per DS10262 Rev 8 Section 6.3.1.

Can the 8 KB EEPROM be used for storing cryptographic keys securely?

The 8 KB true EEPROM includes hardware ECC and write-protection bits per sector, supporting secure key storage. However, it lacks dedicated tamper-detection or bus encryption; for FIPS 140-2 Level 2 compliance, external secure elements (e.g., STSAFE-A110) are recommended alongside EEPROM-stored auxiliary keys.

Is the WLCSP64 package of STM32L151RCY6TR compatible with standard SMT reflow profiles?

Yes. The WLCSP64 package complies with JEDEC J-STD-020 moisture sensitivity level 3 and supports standard Pb-free reflow profiles (peak temperature ≤260°C, time above liquidus 60–150 s). ST provides detailed PCB land pattern and stencil design guidelines in DocID15970 Section 7.2.