STMicroelectronics STM8L151K2U6

Overview

STM8L151K2U6 from STMicroelectronics is an 8-bit ultra-low-power microcontroller featuring 8 KB Flash, 256-byte data EEPROM with ECC, RTC with ±0.5 ppm digital calibration, 12-bit ADC (up to 1 Msps, 28 channels), 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, portable medical devices, and smart utility meters requiring sub-μA Halt-mode current and fast 5 µs wakeup.

For engineers reviewing the STM8L151K2U6 datasheet, STM8L151K2U6 pinout, STM8L151K2U6 application, or STM8L151K2U6 equivalent, key selection criteria include verified Halt-mode current (300 nA typ.), RTC accuracy under LSE clocking, capacitive touch channel count (20 channels), and SWIM-based non-intrusive debugging support in ultra-constrained power budgets.

Technical Context

The STM8L151K2U6 implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. Its low-power continuum includes five distinct modes-Wait, Low-power Run, Low-power Wait, Active-halt with RTC, and Halt-with leakage per I/O as low as 50 nA and guaranteed 5 µs wakeup from Halt.

Clock management integrates three oscillators: 32 kHz LSE for RTC, 1–16 MHz HSE for main system clock, and factory-trimmed 16 MHz HSI with ±1% accuracy at 3.0 V. The RTC supports BCD calendar, alarm interrupt, auto-wakeup, and LSE security monitoring to prevent clock tampering.

Key Specifications

Pinout & Package

STM8L151K2U6 is housed in a 32-pin UFQFPN package (5 × 5 mm, 0.5 mm pitch) with exposed thermal pad. This compact, lead-free RoHS-compliant package supports high-density PCB layouts and efficient thermal dissipation in space-constrained designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L051F3P6, STM8L151K2U6 adds RTC, EEPROM, and capacitive sensing-making it superior for time-stamped logging and HMI. Versus STM32L011K4U6, it offers lower gate count and simpler toolchain but less compute headroom for protocol stacks.

Availability

STM8L151K2U6 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 consistent parametric performance across production batches.

Supply support for STM8L151K2U6 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 STM8L ultra-low-power MCU product line targets battery-operated and energy-harvesting applications where sub-µA sleep current, integrated analog peripherals, and robust RTC functionality are essential design requirements.

FAQ

What is the minimum supply voltage for reliable operation with BOR enabled?

The STM8L151K2U6 requires a minimum VDD of 1.8 V when the Brown-out Reset (BOR) is enabled, as specified in Section 9.3.1 of DS7204 Rev 11. Below this threshold, BOR asserts reset to prevent erratic behavior; disabling BOR allows operation down to 1.65 V but removes this safety mechanism.

Does the 12-bit ADC support hardware-triggered conversions from timers?

Yes-the ADC1 module supports hardware triggers from TIM2, TIM3, and TIM4 update events, enabling precise synchronous sampling of analog signals (e.g., motor current or audio envelope) without CPU intervention or software latency.

Can the capacitive sensing channels operate during Low-power Run mode?

Yes-capacitive sensing is fully functional in Low-power Run mode, consuming only 12 µA typical (at 1 MHz CPU clock). This allows continuous touch detection while maintaining responsiveness and low average current for battery longevity.

Is the 96-bit unique ID accessible via standard debug interfaces?

Yes-the 96-bit unique ID is readable via SWIM during debug sessions and through firmware using the UID registers (addresses 0x4865–0x486A). It is factory-programmed, unalterable, and compliant with IEEE EUI-64 standards for device identification.