STMicroelectronics STM32L100RBT6A

Overview

STM32L100RBT6A from STMicroelectronics is an ultra-low-power 32-bit ARM® Cortex®-M3 microcontroller featuring 128 KB Flash, 16 KB SRAM, 2 KB EEPROM with ECC, integrated LCD driver (8×28 segments), and USB 2.0 interface. It operates from 1.8 V to 3.6 V across –40°C to +85°C, delivers 1.25 DMIPS/MHz, and achieves 0.44 µA Stop mode current - enabling battery-powered portable medical sensors and smart utility meters.

For engineers reviewing the STM32L100RBT6A datasheet, STM32L100RBT6A pinout, STM32L100RBT6A application, or STM32L100RBT6A equivalent, key selection criteria include verified ultra-low-power operation (≤1.38 µA Stop+RTC), dual 12-bit DAC channels with output buffers, 24-channel 1 Msps ADC, USB 2.0 compliance without external PHY, and LQFP64 package compatibility with legacy STM32L1 footprint designs.

Technical Context

The device implements a multi-voltage-domain architecture with dynamic voltage scaling (DVS) supporting Run, Sleep, Low-power Run, Stop, and Standby modes - each with distinct clock gating, regulator states, and peripheral retention. Its clock tree integrates five independent sources: HSE (1–24 MHz), LSE (32.768 kHz), HSI (16 MHz), LSI (37 kHz), and MSI (65 kHz–4.2 MHz), plus a dedicated 48 MHz PLL for USB timing.

Peripherals are partitioned across power domains: the LCD controller includes an on-board step-up converter and contrast control logic; both DACs feature rail-to-rail buffered outputs; two ultra-low-power comparators support window mode and wakeup capability; and the 7-channel DMA controller supports memory-to-peripheral transfers without CPU intervention in low-power states.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad - optimized for manual soldering and thermal dissipation in compact industrial PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L100RBT6A, STM32L053R8T6 offers reduced memory and no LCD support but maintains identical ultra-low-power profile and footprint; STM32L432KCU6 trades EEPROM and LCD integration for higher compute throughput and Cortex-M4F capabilities - requiring PCB redesign due to incompatible pin mapping.

Availability

STM32L100RBT6A is available at Aetrix Electronics and suitable for portable medical sensors, smart utility meters, industrial handheld terminals, and asset tracking beacons requiring stable component supply across extended product lifecycles.

Supply support for STM32L100RBT6A 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.

The STM32L1 series targets ultra-low-power embedded applications demanding multi-year battery life, robust memory integrity, and integrated analog peripherals - particularly in metering, wearables, and environmental monitoring.

FAQ

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

The STM32L100RBT6A operates up to 32 MHz with a typical current draw of 185 µA/MHz in Run mode when executing code from Flash. At full speed (32 MHz), this equates to approximately 5.9 mA - verified under VDD = 3.3 V, TA = 25°C, and all peripherals disabled except SysTick timer.

Does the device support hardware encryption or secure boot features?

No, the STM32L100RBT6A does not integrate hardware cryptographic accelerators (AES, SHA, PKA) or secure boot ROM. Security relies on software-implemented algorithms and external trusted elements; its memory protection unit (MPU) supports region-based access control but lacks tamper detection or secure key storage.

Can the internal 2 KB EEPROM be used for storing calibration data across power cycles?

Yes - the 2 KB true EEPROM supports 400k write/erase cycles and 20-year data retention at 85°C. It is accessed via standard HAL drivers and retains values during all low-power modes including Standby, making it suitable for factory calibration coefficients and user-configurable parameters.

Is the USB interface compatible with USB 2.0 Full-Speed host enumeration without external components?

Yes - the integrated USB 2.0 Full-Speed device controller includes an internal 1.5 kΩ pull-up resistor on USB_DP, allowing direct connection to a USB host without external resistors or level shifters. It supports CDC ACM class for virtual COM port implementation using ST's official USB library.