STMicroelectronics STM32L100C6U6

Overview

STM32L100C6U6 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), 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 achieves 0.57 µA Stop mode current with 16 wakeup lines-ideal for battery-powered medical sensors and portable metering devices.

For engineers reviewing the STM32L100C6U6 datasheet, STM32L100C6U6 pinout, STM32L100C6U6 application, or STM32L100C6U6 equivalent, key selection criteria include verified ultra-low-power operation (0.3 µA Standby), on-chip EEPROM endurance (100k cycles), USB 2.0 full-speed compliance, LCD segment drive capability, and 42 5V-tolerant I/Os mapped to 16 external interrupt vectors.

Technical Context

The STM32L100C6U6 integrates a 32 MHz Cortex-M3 core with MPU, dynamic voltage scaling, and five low-power modes (Run, Sleep, Low-power Run, Stop, Standby) governed by programmable voltage detector (PVD) and ultra-safe BOR with five thresholds. Its clock system combines HSE (1–24 MHz), LSE (32.768 kHz RTC), HSI (16 MHz), LSI (37 kHz), and MSI (65 kHz–4.2 MHz) sources, plus a dedicated PLL for USB 48 MHz generation.

Analog subsystem includes a 12-bit 1 Msps ADC with up to 20 channels, two buffered 12-bit DACs, and two ultra-low-power comparators with internal reference. Memory architecture supports ECC on both Flash and EEPROM, and the LCD controller drives up to 224 segments without external bias components.

Key Specifications

Pinout & Package

STM32L100C6U6 is housed in a 48-pin Ultra-Fine Pitch Quad Flat No-lead (UFQFPN) package measuring 7 × 7 mm with 0.5 mm pitch. This RoHS-compliant ECOPACK®2 package supports automated assembly and offers thermal performance suitable for sealed industrial enclosures.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM32L051K8U6, the STM32L100C6U6 delivers USB and LCD functionality absent in the L0 series; versus STM32L151C6U6, it trades crypto and extended temperature for lower cost and identical ultra-low-power metrics-making it optimal for cost-sensitive, display-equipped, USB-programmable devices.

Availability

STM32L100C6U6 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 throughout product lifecycles.

Supply support for STM32L100C6U6 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 ICs, sensors, and analog products for industrial, automotive, and consumer markets.

The STM32L1 series targets ultra-low-power embedded applications where energy efficiency, integrated peripherals (LCD, USB, EEPROM), and long-term reliability are critical-especially in battery-operated and maintenance-free systems.

FAQ

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

The STM32L100C6U6 runs at up to 32 MHz with 214 µA/MHz typical current draw. At full speed (32 MHz), active current is approximately 6.85 mA when executing code from Flash with peripherals enabled-measured under 3.3 V, 25°C conditions per datasheet Section 6.3.4.

Does the part include hardware error correction for Flash and EEPROM?

Yes. The STM32L100C6U6 implements hardware ECC on both 128 KB Flash and 2 KB EEPROM. Each 64-bit word written to Flash or EEPROM is automatically protected with Hamming-code-based ECC, enabling single-bit error correction and double-bit error detection without software overhead.

Can the integrated LCD controller drive standard character-based modules?

No. The LCD controller supports only static or multiplexed segment-based displays (up to 8 commons × 28 segments). It does not support HD44780-compatible character modules or dot-matrix displays requiring proprietary instruction sets or frame buffer memory.

What USB functionality is supported, and are external components required?

The STM32L100C6U6 integrates a full-speed USB 2.0 device transceiver compliant with USB Specification Revision 2.0. Only a 1.5 kΩ pull-up resistor on USB_DP is required for enumeration; no external PHY, level shifters, or ESD protection diodes are needed for basic operation per datasheet Figure 49 and Section 3.15.4.