STMicroelectronics STM8L151K3U6

Overview

STM8L151K3U6 from STMicroelectronics is an 8-bit ultra-low-power microcontroller featuring 8 KB Flash, 256-byte data EEPROM with ECC, 12-bit ADC (1 Msps, 28 channels), RTC with ±0.5 ppm digital calibration, and dual ultra-low-power comparators. It operates from 1.65–3.6 V across –40 to +85 °C and targets battery-powered sensor nodes and portable medical devices requiring sub-μA sleep current and fast 5 µs wakeup from Halt mode.

For engineers reviewing the STM8L151K3U6 datasheet, STM8L151K3U6 pinout, STM8L151K3U6 application, or STM8L151K3U6 equivalent, key selection criteria include verified low-power mode timing (Active-halt @ 300 nA typical), I/O leakage (50 nA per pin), factory-trimmed 16 MHz RC oscillator accuracy (±1%), and UFQFPN32 package compatibility with capacitive touch sensing up to 20 channels.

Technical Context

The STM8L151K3U6 implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. Its clock system integrates three oscillators: 32 kHz LSE for RTC, 1–16 MHz HSE for high-precision timing, and factory-trimmed 16 MHz HSI with ±1% tolerance over voltage/temperature.

Power management includes five configurable low-power modes-Wait, Low-power Run, Low-power Wait, Active-halt with RTC, and Halt-with dedicated BOR reset (5 thresholds) and programmable voltage detector (PVD). The RTC supports BCD calendar, alarm interrupt, auto-wakeup, and LSE security monitoring.

Key Specifications

Pinout & Package

STM8L151K3U6 is packaged in a 32-pin UFQFPN (5 × 5 mm, 0.5 mm pitch) with exposed thermal pad. This RoHS-compliant, ECOPACK®-qualified package supports automated optical inspection and high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L051F3P6, STM8L151K3U6 adds RTC, EEPROM, and 28-channel ADC - essential for time-stamped logging. Versus STM32L011K4U6, it offers lower gate count, deterministic 8-bit ISR latency, and proven toolchain maturity for legacy industrial firmware.

Availability

STM8L151K3U6 is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, and industrial wireless sensor nodes requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for STM8L151K3U6 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, MEMS, and automotive semiconductors.

The STM8L ultra-low-power MCU product line targets energy-constrained applications including battery-operated meters, wearables, and IoT edge nodes - emphasizing sub-μA sleep currents, fast wake-up, and integrated analog peripherals.

FAQ

What is the maximum operating frequency and core architecture of the STM8L151K3U6?

The STM8L151K3U6 features an 8-bit STM8 core with Harvard architecture and 3-stage pipeline, achieving a maximum operating frequency of 16 MHz and delivering 16 CISC MIPS peak performance. It uses a single-cycle instruction set optimized for low-power deterministic execution, with no cache or branch prediction - ensuring consistent timing behavior critical for real-time sensor control loops.

Does the STM8L151K3U6 support hardware-accelerated capacitive touch sensing?

Yes, the STM8L151K3U6 integrates a dedicated hardware touch sensing controller supporting up to 20 channels across its GPIO banks. It natively implements touchkey, proximity, linear slider, and rotary wheel sensing without CPU intervention, using built-in charge-transfer measurement and noise filtering - validated per IEC 61000-4-6 for EMC robustness in consumer appliances.

What are the verified current consumption values in Halt and Active-halt modes?

In Halt mode (all clocks stopped, RAM retained), typical current is 300 nA at 25 °C and 3.0 V. In Active-halt mode (RTC + LSE running, CPU halted), typical current is 900 nA under same conditions. Both values are measured per datasheet Table 25 and Table 23, with LSE crystal active and VDD = 3.0 V - confirmed across production lots and temperature range.

Is SWIM debugging supported, and what interface is required?

Yes, the STM8L151K3U6 supports non-intrusive on-chip debugging and programming via the Single-Wire Interface Module (SWIM) using the dedicated SWIM pin. A standard ST-LINK/V2 or compatible debugger is required; no additional level-shifting or protocol conversion is needed, and SWIM operates down to 1.65 V - enabling full debug access even in ultra-low-voltage battery scenarios.