STMicroelectronics STM8L151C4U6

Overview

STM8L151C4U6 from STMicroelectronics is an 8-bit ultra-low-power microcontroller featuring 16 MHz STM8 core, 16 KB Flash, 1 KB Data EEPROM with ECC, 2 KB RAM, 12-bit ADC (1 Msps, 25 channels), 12-bit DAC, two ultra-low-power comparators, RTC with calendar and alarm, and up to 41 I/Os. It operates from 1.65 V to 3.6 V and supports five low-power modes-including Halt mode at 350 nA-making it suitable for battery-powered sensor nodes and portable medical devices.

For engineers reviewing the STM8L151C4U6 datasheet, STM8L151C4U6 pinout, STM8L151C4U6 application, or STM8L151C4U6 equivalent, key selection criteria include verified sub-µA Halt current, factory-trimmed 16 MHz RC oscillator accuracy (±1%), integrated RTC with auto-wakeup, 12-bit ADC linearity (±1 LSB INL), and SWIM-based non-intrusive debugging support.

Technical Context

The STM8L151C4U6 implements a Harvard-architecture 3-stage pipelined STM8 core delivering 16 CISC MIPS at 16 MHz, with up to 40 external interrupt sources and fast 4.7 µs wakeup from Halt mode. Its clock system integrates dual crystal oscillators (1–16 MHz HSE and 32 kHz LSE), plus internal 16 MHz factory-trimmed RC (±1% over -40°C to +85°C) and 38 kHz low-consumption RC.

Power management includes five configurable low-power modes, programmable voltage detector (PVD), ultra-safe BOR with five thresholds, and per-pin leakage as low as 50 nA. The analog subsystem combines a 12-bit ADC with internal temperature sensor and reference voltage, a buffered 12-bit DAC on PB4–PB6, and two rail-to-rail comparators-one with fixed threshold and wakeup capability.

Key Specifications

Pinout & Package

STM8L151C4U6 is housed in a 48-pin UFQFPN package (7 × 7 mm, 0.5 mm pitch), optimized for space-constrained PCB layouts and thermal performance in compact battery-powered designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar ultra-low-power 8-bit microcontroller applications.

Compared with STM8L051F3P6, STM8L151C4U6 adds RTC, DAC, and ECC EEPROM at modest cost premium-justified in time-aware or analog-output applications. Versus EFM8LB12F32ES1, it trades 100 nA lower Halt for proven SWIM debug, factory oscillator trim, and embedded EEPROM reliability.

Availability

STM8L151C4U6 is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, industrial wireless sensor nodes, and home appliance control panels requiring stable component supply across multi-year production cycles.

Supply support for STM8L151C4U6 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 analog products for industrial, automotive, and consumer markets.

The STM8L ultra-low-power MCU product line targets energy-constrained applications such as battery-operated meters, wearables, and IoT edge nodes-emphasizing sub-µA sleep currents, integrated peripherals, and robust qualification for extended field deployment.

FAQ

What is the guaranteed minimum operating voltage for STM8L151C4U6 in Halt mode?

The STM8L151C4U6 guarantees operation down to 1.65 V in all low-power modes including Halt, with 350 nA typical current at 3.0 V and 25°C. At 1.65 V, Halt current rises to 500 nA maximum per datasheet Table 26, maintaining full RTC functionality and register retention.

Does STM8L151C4U6 support true hardware AES encryption?

No. The STM8L151C4U6 does not include hardware cryptographic accelerators. It relies on software-based AES implementations; for secure boot or data encryption, external secure elements (e.g., STSAFE-A) or higher-tier MCUs like STM32L5 are required.

Can the internal 16 MHz RC oscillator be used for UART communication without external crystal?

Yes. The factory-trimmed 16 MHz RC oscillator achieves ±1% accuracy over -40°C to +85°C and 1.65–3.6 V, enabling reliable UART communication at 115.2 kbps with less than 1% baud error-no external crystal needed for most industrial serial interfaces.

How many I/O pins support capacitive touch sensing on STM8L151C4U6?

The STM8L151C4U6 supports up to 16 capacitive sensing channels across GPIOs PA0–PA7, PB0–PB7, and PC0–PC1, using its integrated Capacitive Sensing Controller (CSCT). All channels support touchkey, proximity, linear, and rotary configurations with hardware-accelerated scanning.