STMicroelectronics STM32L100RBT6TR

Overview

STM32L100RBT6TR from STMicroelectronics is an ultra-low-power 32-bit ARM® Cortex®-M3 microcontroller featuring 128 KB Flash, 10 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 214 µA/MHz in Run mode, and supports sub-µA low-power modes including 0.57 µA Stop mode - ideal for battery-powered portable medical sensors and smart utility meters.

For engineers reviewing the STM32L100RBT6TR datasheet, STM32L100RBT6TR pinout, STM32L100RBT6TR application, or STM32L100RBT6TR equivalent, key selection criteria include verified ultra-low-power operation (0.57 µA Stop mode), on-chip 2 KB true EEPROM with ECC, dual 12-bit DACs with output buffers, 12-bit ADC up to 20 channels at 1 Msps, and LQFP64 package compatibility with existing STM32L1 footprint designs.

Technical Context

The STM32L100RBT6TR implements a tightly integrated ultra-low-power architecture centered on dynamic voltage scaling and multiple autonomous low-power modes. Its Cortex-M3 core runs at up to 32 MHz with 1.25 DMIPS/MHz, supported by memory protection unit (MPU) and hardware CRC unit. The clock system combines five internal sources (HSI, LSI, MSI, HSI16, LSE) and external crystal options (1–24 MHz HSE, 32.768 kHz LSE), enabling precise RTC calibration and flexible power/performance trade-offs.

Peripherals are designed for concurrent low-power operation: the 12-bit ADC supports hardware oversampling and analog watchdogs; two DACs feature built-in output buffers and configurable trigger sources; dual ultra-low-power comparators operate down to 1.65 V supply; and the LCD controller drives up to 224 segments without external bias components. All I/Os support 5V tolerance and are mappable to 16 external interrupt vectors.

Key Specifications

Pinout & Package

LQFP64 package (10 × 10 mm, 0.5 mm pitch), ECOPACK®2 compliant, with 64 leads and exposed thermal pad. Designed for reflow soldering and compatible with standard PCB assembly processes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L100RBT6TR, STM32L053R8T6 trades EEPROM for lower cost and smaller Flash, while STM32L432KCU6 upgrades to Cortex-M4F and security IP at the expense of ultra-low-power efficiency - making STM32L100RBT6TR optimal for cost-sensitive, long-life, EEPROM-dependent metering and sensing designs.

Availability

STM32L100RBT6TR is available at Aetrix Electronics and suitable for portable medical sensors, smart utility meters, industrial wireless nodes, and asset tracking beacons requiring stable component supply and long-term production continuity.

Supply support for STM32L100RBT6TR 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 where battery longevity, EEPROM reliability, and integrated analog peripherals are critical - especially in metering, wearable health, and IoT edge nodes.

FAQ

What is the maximum operating frequency and corresponding power consumption of the STM32L100RBT6TR?

The STM32L100RBT6TR operates at up to 32 MHz in Run mode with typical current consumption of 214 µA/MHz at 3.3 V and 25°C. At full speed (32 MHz), this equates to approximately 6.85 mA. Dynamic voltage scaling allows reduced core voltage at lower frequencies, further lowering power - e.g., 9 µA in Low-power run mode at 32 kHz.

Does the STM32L100RBT6TR support USB device functionality without external components?

Yes. The STM32L100RBT6TR integrates a full-speed USB 2.0 transceiver with internal pull-up resistor on USB_DP. No external PHY, termination resistors, or level shifters are required. It supports standard USB device classes including CDC and HID when paired with appropriate firmware stack.

How is the 2 KB EEPROM implemented, and what are its endurance specifications?

The 2 KB EEPROM is implemented as true on-chip EEPROM (not emulated in Flash), with built-in ECC for bit error correction. It guarantees >300,000 write/erase cycles and >20 years of data retention at 85°C, validated per ST's qualification standards. Access is via dedicated PEC (Peripheral EEPROM Controller) registers with byte/word programming support.

Can the STM32L100RBT6TR drive a segment LCD without external bias circuitry?

Yes. The integrated LCD controller supports up to 8 commons × 28 segments and includes an internal charge pump generating VLCD from VDD. Contrast is adjustable via software-controlled voltage divider, eliminating need for external resistors or dedicated LCD bias ICs - reducing BOM and layout complexity.