STMicroelectronics STM8L151K6U3

Overview

STM8L151K6U3 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 integrated capacitive touch sensing (16 channels). It operates from 1.65 V to 3.6 V across –40 °C to +125 °C and targets battery-powered industrial sensors and portable medical devices.

For engineers reviewing the STM8L151K6U3 datasheet, STM8L151K6U3 pinout, STM8L151K6U3 application, or STM8L151K6U3 equivalent, key selection criteria include active-halt current (1.3 µA with full RTC), Halt mode consumption (350 nA), fast wakeup time (4.7 µs), 41 mappable I/Os with interrupt capability, and SWIM-based non-intrusive debugging support.

Technical Context

The STM8L151K6U3 implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. Its power management includes five low-power modes-Wait, Low Power Run (5.1 µA), Low Power Wait (3 µA), Active-Halt (1.3 µA), and Halt (350 nA)-with programmable voltage detector and ultra-safe BOR reset.

Clock flexibility is provided by dual crystal oscillators (1–16 MHz HSE, 32 kHz LSE), factory-trimmed 16 MHz RC, and 38 kHz low-consumption RC, all supported by clock security system. The peripheral set includes DMA (4 channels), advanced control timer (TIM1), two general-purpose 16-bit timers, beeper timer, and communication interfaces: SPI, I²C (400 kHz SMBus/PMBus™), and USART with IrDA/ISO 7816 support.

Key Specifications

Pinout & Package

STM8L151K6U3 is housed in a 32-pin UFQFPN package (5 × 5 mm, 0.5 mm pitch), optimized for space-constrained ultra-low-power designs. Pin functions are validated per ST's DS6372 Rev 17, Table 5 (pin description) and Figure 4 (32-pin package pinout).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L052K6T6, STM8L151K6U3 adds DAC, touch sensing, and larger memory - essential for feature-rich endpoints. Versus STM32L053R8T6, it offers lower gate count, simpler toolchain, and deterministic 8-bit timing - advantageous for cost-sensitive, latency-critical embedded control.

Availability

STM8L151K6U3 is available at Aetrix Electronics and suitable for wireless sensor nodes, portable medical monitors, smart utility meters, and industrial condition monitors requiring stable component supply across extended product lifecycles.

Supply support for STM8L151K6U3 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 such as battery-operated sensors, wearables, and smart meters - emphasizing sub-µA sleep currents, fast wake-up, and integrated analog peripherals.

FAQ

What is the maximum operating frequency and core architecture of the STM8L151K6U3?

The STM8L151K6U3 features an 8-bit STM8 core with Harvard architecture and 3-stage pipeline, achieving a peak performance of 16 CISC MIPS at its maximum operating frequency of 16 MHz. It uses a factory-trimmed 16 MHz RC oscillator or external crystal (1–16 MHz) for clocking, with clock security system to detect failure and switch to backup source.

Does the STM8L151K6U3 support capacitive touch sensing, and how many channels are available?

Yes, the STM8L151K6U3 integrates a hardware-accelerated capacitive touch sensing controller supporting up to 16 channels. It enables touchkey, proximity, linear touch, and rotary touch implementations without external components, with built-in noise immunity and automatic calibration routines accessible via standard firmware libraries.

What are the lowest power consumption modes and their typical current draw?

The lowest power mode is Halt, drawing just 350 nA at 3.0 V and 25 °C with all clocks stopped except the LSE for RTC backup. Active-Halt mode consumes 1.3 µA while maintaining full RTC functionality and RAM retention. Both modes support wake-up via external interrupt, RTC alarm, or comparator event within 4.7 µs.

Is the STM8L151K6U3 pin-compatible with other members of the STM8L151x6 family?

Yes - the STM8L151K6U3 in UFQFPN32 is pin-compatible with STM8L151K4U3 (16 KB Flash) and STM8L152K6U3 (same package but with LCD controller). Differences are limited to memory size and peripheral enablement; PCB layout and signal routing remain identical across these K6/K4 variants in the same package.