STMicroelectronics STM8L151K4U6

Overview

STM8L151K4U6 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, and integrated peripherals including 12-bit ADC (1 Msps, 25 channels), 12-bit DAC, two ultra-low-power comparators, RTC with calendar, and capacitive touch sensing (up to 16 channels). It operates from 1.65 V to 3.6 V and supports industrial temperature range (–40 °C to +85 °C), targeting battery-powered sensor nodes and portable medical devices.

For engineers reviewing the STM8L151K4U6 datasheet, STM8L151K4U6 pinout, STM8L151K4U6 application, or STM8L151K4U6 equivalent, key selection considerations include its 32-pin UFQFPN package, 350 nA Halt-mode current, 4.7 µs wakeup time, SWIM debug interface, and absence of LCD controller - distinguishing it from STM8L152 variants.

Technical Context

The STM8L151K4U6 implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. Its power architecture includes five low-power modes - notably Active-halt (1.3 µA with full RTC) and Halt (350 nA) - enabled by ultra-low-leakage I/O (50 nA per pin) and dual internal RC oscillators (16 MHz factory-trimmed, 38 kHz low-consumption).

Clock management integrates three oscillators (HSE up to 16 MHz, LSE 32 kHz, internal RCs), clock security system, and programmable voltage detector (PVD). Peripheral subsystems include DMA (4 channels), timers (two 16-bit general-purpose, one 16-bit advanced control, one 8-bit basic), and communication interfaces (SPI, I²C up to 400 kHz, USART with IrDA/ISO 7816 support).

Key Specifications

Pinout & Package

STM8L151K4U6 is housed in a 32-pin UFQFPN (5 × 5 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are fully mappable to interrupt vectors, supporting flexible PCB layout and signal routing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L051F3P6, STM8L151K4U6 adds RTC calendar, DAC, and EEPROM ECC for enhanced reliability; versus STM32L011D4P6, it offers smaller memory footprint, deterministic 8-bit timing, and lower toolchain overhead - making it optimal for deeply embedded, battery-limited control tasks.

Availability

STM8L151K4U6 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 and long-term industrial lifecycle support.

Supply support for STM8L151K4U6 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 components 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 analog peripherals, and robust development tooling.

FAQ

What is the maximum operating frequency and corresponding power consumption of STM8L151K4U6?

The STM8L151K4U6 operates at up to 16 MHz with typical active current of 195 µA/MHz + 440 µA. At 16 MHz and 3.3 V, total consumption is approximately 3.56 mA. This value includes core, flash, and peripheral overhead - verified in DS6372 Rev 17 Table 20 under "Total current consumption in Run mode".

Does STM8L151K4U6 support hardware-accelerated capacitive touch sensing?

Yes - it integrates a dedicated capacitive sensing controller supporting up to 16 channels with hardware charge-transfer measurement, enabling touchkey, proximity, linear, and rotary touch without CPU intervention. This is confirmed in Section 3.13 and Table 2 of DS6372 Rev 17.

What debug interface does STM8L151K4U6 use, and what are its physical requirements?

It uses the Single-Wire Interface Module (SWIM), requiring only one dedicated pin (SWIM) and ground. No external debugger is needed for basic programming and debugging; ST-LINK/V2 or compatible tools provide full visibility into registers, memory, and real-time execution flow.

Is the 1 KB Data EEPROM endurance and retention specified, and how is ECC implemented?

EEPROM endurance is rated at 300 k write/erase cycles; data retention exceeds 20 years at 85 °C. ECC is implemented per 32-bit word using Hamming code, automatically correcting single-bit errors and detecting double-bit errors - detailed in Section 3.7 and Table 36 of DS6372 Rev 17.