STMicroelectronics STM8L151K6U6

Overview

STM8L151K6U6 from STMicroelectronics is an 8-bit ultra-low-power microcontroller featuring 32 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 BCD calendar and auto-wakeup, and capacitive touch sensing (16 channels). It operates from 1.65 V to 3.6 V across –40 °C to +85 °C and targets battery-powered metering, portable medical devices, and smart sensors.

For engineers reviewing the STM8L151K6U6 datasheet, STM8L151K6U6 pinout, STM8L151K6U6 application, or STM8L151K6U6 equivalent, key selection criteria include verified low-power mode current (1.3 µA in Active-halt with RTC), Halt-mode wakeup time (4.7 µs), I/O leakage (50 nA), SWIM debug interface support, and UFQFPN32 package compatibility for space-constrained designs.

Technical Context

The STM8L151K6U6 implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. It integrates dual clock domains: high-speed (1–16 MHz HSE or 16 MHz factory-trimmed RC) and low-speed (32 kHz LSE or 38 kHz RC), managed by a Clock Security System to detect oscillator failure.

Its power architecture supports five distinct low-power modes-Wait, Low Power Run (5.1 µA), Low Power Wait (3 µA), Active-halt with full RTC (1.3 µA), and Halt (350 nA)-with independent control of peripheral clocks and voltage regulator states. The RTC operates autonomously in Active-halt using the LSE crystal, enabling calendar-based wakeups without CPU intervention.

Key Specifications

Pinout & Package

STM8L151K6U6 is housed in a 32-pin UFQFPN (5 × 5 mm, 0.5 mm pitch) package with wettable flanks, optimized for automated optical inspection and high-density PCB layouts. Pin functions are fully mappable to interrupt vectors, supporting flexible signal routing in compact designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L151K4U6, the K6U6 provides essential headroom for firmware updates and ECC-protected data logging; versus STM32L051K8U6, it delivers superior µA/MHz efficiency and simpler toolchain integration for deterministic real-time tasks under strict energy budgets.

Availability

STM8L151K6U6 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 STM8L151K6U6 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 since 1987.

The STM8L ultra-low-power MCU family was engineered specifically for energy-constrained applications demanding sub-microamp operation, robust RTC functionality, and integrated analog peripherals - targeting metering, healthcare, and IoT edge nodes where battery life and reliability are paramount.

FAQ

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

The STM8L151K6U6 achieves a maximum system clock of 16 MHz using the internal 16 MHz RC oscillator or external crystal. At 16 MHz and 3.0 V, typical active current is 195 µA/MHz + 440 µA, resulting in ~3.56 mA total. This value scales linearly with frequency and is validated across the full temperature range (–40 °C to +85 °C) per DS6372 Rev 17 Section 9.3.3.

Does the device support true hardware LCD driving?

No. The STM8L151K6U6 belongs to the STM8L151xx series "without LCD" (per Table 1 of DS6372), and lacks the integrated LCD controller present in STM8L152xx variants. It can drive simple segmented displays via GPIO toggling or external LCD drivers, but does not provide built-in bias generation, COM/SEG multiplexing, or step-up converter circuitry.

How many capacitive sensing channels are supported, and what is their implementation method?

The STM8L151K6U6 supports up to 16 capacitive touch sensing (CTP) channels using its integrated CTP peripheral, which leverages the ADC and timers to perform charge-transfer measurements. No external components are required; sensing electrodes connect directly to designated GPIO pins (PA0–PA7, PB0–PB7, PC0–PC3), and firmware configures scan sequences, thresholds, and debounce logic per channel.

Is SWIM debugging compatible with production firmware and secure boot configurations?

Yes. SWIM operates independently of the application code and remains functional even when read-out protection (ROP) is enabled at Level 1 (which permits debug access but blocks Flash readout). At ROP Level 2, SWIM is disabled for security; however, ST's official production programming tools (e.g., ST-LINK/V2-1) support mass erase and reprogramming via SWIM before final ROP activation, ensuring testability and field update capability.