STMicroelectronics STM32L151RBT6ATR

Overview

STM32L151RBT6ATR from STMicroelectronics is an ultra-low-power 32-bit ARM® Cortex®-M3 microcontroller featuring 128 KB Flash, 32 KB SRAM, 4 KB EEPROM with ECC, 12-bit ADC (1 Msps, 24 channels), and dual 12-bit DACs - deployed in battery-powered IoT sensors, portable medical devices, and smart utility meters requiring sub-µA standby operation.

For engineers reviewing the STM32L151RBT6ATR datasheet, STM32L151RBT6ATR pinout, STM32L151RBT6ATR application, or STM32L151RBT6ATR equivalent, key selection criteria include verified ultra-low-power modes (0.28 µA Standby), USB 2.0 full-speed interface with internal 48 MHz PLL, LCD driver exclusion (per device variant), and LQFP64 package compatibility with industrial temperature range (-40°C to +105°C).

Technical Context

This MCU implements a deterministic ARM Cortex-M3 core running at up to 32 MHz with MPU, supported by multiple clock sources: 1–24 MHz HSE, 32 kHz LSE for RTC, 16 MHz HSI (±1%), and multispeed MSI (65 kHz–4.2 MHz). Its power architecture includes five low-power modes (Run, Sleep, Low-power Run, Stop, Standby) with hardware-controlled voltage scaling and brownout reset (BOR) with five thresholds.

Analog subsystem integration includes two ultra-low-power comparators with window mode and wake-up capability, temperature sensor, VREFINT reference, and dedicated ADC/DAC peripherals operating down to 1.8 V supply - all coordinated via 7-channel DMA and programmable I/Os (73 5V-tolerant pins, 16 EXTI vectors).

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad; 64-pin quad flat lead frame optimized for thermal dissipation and high-density routing in space-constrained designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power ARM Cortex-M3 microcontroller applications.

Compared with STM32L152RBT6, the STM32L151RBT6ATR omits LCD and crypto blocks for cost-sensitive, non-display applications; versus STM32L431RCT6, it trades FPU and larger memory for proven EEPROM reliability and lower standby current in battery-critical roles.

Availability

STM32L151RBT6ATR is available at Aetrix Electronics and suitable for wearable health monitors, smart utility meters, industrial wireless sensor nodes, and portable diagnostic devices requiring stable component supply across extended product lifecycles.

Supply support for STM32L151RBT6ATR 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, designing and manufacturing microcontrollers, power management ICs, MEMS, and automotive semiconductors with vertical fabrication capacity.

The STM32L1 series targets ultra-low-power embedded applications demanding multi-year battery life, robust memory integrity, and rich analog integration - optimized for IoT endpoints, medical wearables, and smart infrastructure.

FAQ

Does STM32L151RBT6ATR include an integrated LCD controller?

No. The STM32L151RBT6ATR excludes the LCD controller present in STM32L152 variants. This is explicitly confirmed in Section 3.9 of the datasheet ("LCD (liquid crystal display)" states "except STM32L151x6/8/B-A devices"). Designers requiring segment LCD drive must select STM32L152RBT6 or add external display drivers.

What is the maximum operating frequency and associated power consumption in Run mode?

The STM32L151RBT6ATR operates up to 32 MHz in Run mode. At 32 MHz with code executing from Flash, typical current consumption is 185 µA/MHz (i.e., ~5.92 mA total), per Table 18 in the datasheet. Dynamic voltage scaling adjusts core voltage to maintain efficiency across frequency ranges.

How many I/O pins support 5V tolerance, and which ones are excluded?

73 of the 83 total I/Os are 5V tolerant, as stated in the "Features" section. Pins excluded from 5V tolerance include those dedicated to analog functions (VREF+, VREF−, VBAT, VDDA, VSSA), USB (PA11/PA12), and oscillator inputs (PH0/PH1, PC14/PC15). Full mapping is defined in Table 9 (Pin Definitions) of the datasheet.

Is the 4 KB EEPROM truly erasable and writable during application runtime?

Yes. The 4 KB of true EEPROM supports byte/word erase and write operations while the application runs, with endurance rated at 400k cycles and data retention of 20 years at 85°C (Table 37). It uses hardware ECC and is accessed via dedicated PEC (Program/Erase Controller) peripheral, independent of Flash programming.