STMicroelectronics STM32L100RCT6

Overview

STM32L100RCT6 from STMicroelectronics is an ultra-low-power 32-bit ARM® Cortex®-M3 microcontroller featuring 256 KB Flash, 16 KB SRAM, 4 KB EEPROM with ECC, integrated LCD driver (8×28 segments), USB 2.0 interface, and dual 12-bit DACs. It operates from 1.65 V to 3.6 V across –40 °C to 105 °C and targets battery-powered portable instrumentation and smart sensors requiring long runtime and on-chip analog integration.

For engineers reviewing the STM32L100RCT6 datasheet, STM32L100RCT6 pinout, STM32L100RCT6 application, or STM32L100RCT6 equivalent, key selection criteria include standby current (0.29 µA), 12-bit ADC with 20-channel sampling at 1 MSPS, USB 2.0 support with internal 48 MHz PLL, LCD segment drive capability, and 51 fast I/Os with 42 5V-tolerant pins - all in LQFP64 package.

Technical Context

The STM32L100RCT6 implements a power-optimized Cortex-M3 core with MPU, dynamic voltage scaling, and multiple low-power modes including Stop (0.44 µA) and Standby (0.29 µA). Its clock system integrates HSE (1–24 MHz), LSE (32.768 kHz), HSI (16 MHz), LSI (37 kHz), and MSI (65 kHz–4.2 MHz) sources, plus a dedicated USB PLL generating 48 MHz.

Analog subsystem includes a 12-bit ADC (1 MSPS, 20 channels), two buffered 12-bit DACs, two ultra-low-power comparators with window mode and wakeup capability, and an internal voltage reference (VREFINT). Memory architecture features ECC-protected Flash and EEPROM, 20-byte backup registers, and flexible remappable GPIOs tied to 16 external interrupt vectors.

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 105 °C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L100RCT6, STM32L053R8T6 trades peripheral integration for lower cost and power in basic sensing, while STM32L432KCU6 upgrades CPU capability and security at the expense of LCD functionality - making STM32L100RCT6 uniquely balanced for display-equipped, USB-enabled, ultra-low-power edge devices.

Availability

STM32L100RCT6 is available at Aetrix Electronics and suitable for portable medical sensors, smart utility meters, industrial handheld terminals, and low-power environmental monitors requiring stable component supply across extended product lifecycles.

Supply support for STM32L100RCT6 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 energy efficiency, integrated analog peripherals, and long battery life are critical - specifically optimized for portable instrumentation, wearables, and smart metering.

FAQ

Does STM32L100RCT6 support USB device mode without external crystal?

Yes. The STM32L100RCT6 integrates a USB 2.0 full-speed transceiver with an internal 48 MHz PLL that can be clocked from the HSE (1–24 MHz) or MSI oscillator. No external 48 MHz crystal is required - only the standard 1–24 MHz HSE crystal (or none, if using MSI) suffices for USB enumeration and data transfer.

What is the maximum segment count supported by the built-in LCD driver?

The STM32L100RCT6 LCD controller supports up to 8 commons and 28 segments (8×28 configuration), enabling direct drive of alphanumeric or custom segmented displays with static, 2-, 3-, or 4-mux multiplexing. This matches common 4-digit 7-segment + status icon layouts used in handheld test equipment and portable analyzers.

How does the 4 KB EEPROM with ECC differ from standard Flash-based emulated EEPROM?

Unlike emulated EEPROM in Flash, the dedicated 4 KB true EEPROM in STM32L100RCT6 provides byte-write capability, 100 kcycle endurance, and 40-year data retention at 85 °C - all with hardware ECC for single-bit correction and double-bit detection. This eliminates software wear-leveling overhead and guarantees reliability in frequent parameter updates (e.g., calibration coefficients, billing counters).

Can all 51 I/Os be used simultaneously with full 5V tolerance?

No. Only 42 of the 51 I/Os (PA0–PA15, PB0–PB15, PC0–PC1, PC4–PC5, PD2) are 5V tolerant. Pins such as PA13/PA14 (SWD), PB3/PB4 (JTAG), and VLCD-related pins are not 5V tolerant and must remain within VDD limits. Always consult Table 7 (pin definitions) in the datasheet for per-pin voltage ratings.