STMicroelectronics STM32L100RBT6ATR

Overview

STM32L100RBT6ATR from STMicroelectronics is an ultra-low-power 32-bit ARM® Cortex®-M3 microcontroller in LQFP64 package, featuring 128KB Flash, 16KB SRAM, 2KB EEPROM with ECC, integrated LCD driver (8×28 segments), USB 2.0 interface, and dual 12-bit DACs. It operates from 1.8 V to 3.6 V across –40°C to +85°C and targets battery-powered portable instrumentation requiring sub-µA standby current (0.28 µA) and fast wakeup (< 8 µs).

For engineers reviewing the STM32L100RBT6ATR datasheet, STM32L100RBT6ATR pinout, STM32L100RBT6ATR application, or STM32L100RBT6ATR equivalent, key selection criteria include ultra-low-power mode timing, LCD segment drive capability, USB 2.0 PHY integration, DAC output buffer presence, and 51 fast I/Os with 5V tolerance on 42 pins.

Technical Context

The device implements a full ARM Cortex-M3 core with MPU, running at up to 32 MHz with 1.25 DMIPS/MHz performance. Its clock system integrates multiple oscillators: HSE (1–24 MHz), LSE (32.768 kHz for RTC), HSI (16 MHz), LSI (37 kHz), and MSI (65 kHz–4.2 MHz), plus a dedicated 48 MHz PLL for USB.

Power architecture supports five low-power modes-Run, Sleep, Low-power Run, Stop, and Standby-with hierarchical voltage scaling and dynamic regulation. Analog subsystem includes a 12-bit 1 Msps ADC (24 channels), two buffered 12-bit DACs, two ultra-low-power comparators with window mode and wakeup capability, and internal VREFINT calibration.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant, industrial temperature grade (–40°C to +85°C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L053R8T6, STM32L100RBT6ATR adds LCD driving and dual DACs at higher power efficiency; versus STM32L432KCU6, it trades peak performance for deeper low-power states and display integration - making it optimal for long-life, display-equipped edge devices.

Availability

STM32L100RBT6ATR is available at Aetrix Electronics and suitable for portable medical sensors, smart utility meters, industrial handheld terminals, and low-power IoT edge nodes requiring stable component supply and extended lifecycle support.

Supply support for STM32L100RBT6ATR 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.

This part belongs to the STM32L1 Ultra-Low-Power MCU product line, engineered specifically for battery-operated applications demanding multi-year runtime, integrated analog peripherals, and human-interface features like LCD driving.

FAQ

What is the maximum operating frequency and core type of STM32L100RBT6ATR?

The STM32L100RBT6ATR integrates an ARM Cortex-M3 core rated for up to 32 MHz operation, delivering 1.25 DMIPS/MHz performance. It supports dynamic voltage scaling to maintain efficiency across operating frequencies and includes a Memory Protection Unit (MPU) for secure memory partitioning in real-time applications.

Does STM32L100RBT6ATR support USB functionality without external components?

Yes - it includes a full-speed USB 2.0 device interface with an integrated PHY and a dedicated 48 MHz PLL, eliminating the need for an external crystal or clock source for USB operation. The USB_DP and USB_DM pins connect directly to a USB connector with appropriate ESD protection and series resistors per USB specification.

How many I/O pins are 5V tolerant, and what is their functional significance?

42 of the 51 GPIOs are 5V tolerant, enabling direct connection to legacy 5V logic, sensors, or displays without level-shifting circuitry. This simplifies system design in mixed-voltage environments and reduces BOM count - especially valuable in industrial handhelds and utility meters integrating older peripherals.

What LCD capabilities does STM32L100RBT6ATR provide, and how is contrast controlled?

The MCU integrates an LCD controller supporting up to 8 commons × 28 segments, with programmable contrast adjustment via software-controlled internal resistor ladder and blinking mode for visual alerts. An on-chip step-up converter generates the VLCD supply rail, allowing direct drive of passive segment LCDs without external voltage boosters.