STMicroelectronics STM8L151K4T3

Overview

STM8L151K4T3 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, RTC, 12-bit ADC (1 Msps, 25 channels), 12-bit DAC, two ultra-low-power comparators, and up to 34 I/Os in a 32-pin LQFP package. It operates from 1.65 V to 3.6 V and supports five low-power modes - including Halt mode at 350 nA - for battery-powered sensor nodes and portable medical devices.

For engineers reviewing the STM8L151K4T3 datasheet, STM8L151K4T3 pinout, STM8L151K4T3 application, or STM8L151K4T3 equivalent, key selection criteria include verified sub-µA Halt current, factory-trimmed 16 MHz RC oscillator accuracy (±1%), integrated RTC with auto-wakeup, 12-bit ADC linearity (±1 LSB INL), and SWIM debug interface compatibility with ST-LINK v2.

Technical Context

The STM8L151K4T3 implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. Its clock system integrates dual crystal oscillators (1–16 MHz HSE and 32 kHz LSE), internal 16 MHz factory-trimmed RC (±1% @ 25 °C), and 38 kHz low-consumption RC, all managed by a clock security system with failover detection.

Power management includes programmable voltage detector (PVD), ultra-safe BOR with five thresholds, and dynamic voltage scaling support across five low-power modes - notably Active-halt (1.3 µA with full RTC) and Halt (350 nA) - enabled by independent power domains for analog, digital, and backup registers.

Key Specifications

Pinout & Package

LQFP32 (7 × 7 mm, 0.8 mm pitch) package with 34 I/O pins (32 usable + NRST + VDDA); RoHS-compliant, ECOPACK® certified, rated for industrial temperature range (-40 °C to +85 °C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L051F3P6, the STM8L151K4T3 adds RTC, DAC, and EEPROM with ECC - essential for time-aware data logging. Versus EFM32ZG108F16, it delivers identical ultra-low-power sleep performance with lower system-level BOM cost due to integrated calendar RTC and analog peripherals.

Availability

STM8L151K4T3 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 across extended product lifecycles.

Supply support for STM8L151K4T3 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 family targets energy-constrained applications such as battery-operated sensors, wearables, and smart meters - prioritizing sub-µA sleep modes, integrated analog peripherals, and robust industrial qualification.

FAQ

What is the maximum operating frequency and how is it achieved?

The STM8L151K4T3 achieves 16 MHz maximum frequency using its internal 16 MHz factory-trimmed RC oscillator (±1% accuracy over -40 °C to +85 °C) or an external 1–16 MHz crystal. No PLL is used; the core runs directly from the selected clock source, minimizing jitter and power overhead. External crystal configuration requires matching load capacitors per Table 29 in DS6372 Rev 17.

Does the device support true hardware RTC with calendar and alarm in lowest power mode?

Yes. The STM8L151K4T3 integrates a BCD calendar RTC powered from the VBAT domain, operational in Active-halt mode (1.3 µA) and Halt mode (350 nA). It supports alarm interrupts, periodic wakeup (1 s to 128 s), and automatic calendar increment - all without CPU intervention or external components.

How many I/O pins support capacitive sensing, and what is the implementation method?

Up to 16 I/O pins support capacitive sensing via the integrated CS (Capacitive Sensing) peripheral. It uses charge-transfer measurement with hardware-accelerated scanning, supporting touchkey, proximity, linear slider, and rotary wheel configurations. No external RC network or dedicated sensing IC is required - all timing and demodulation are handled in hardware.

Is SWIM debug compatible with standard ST-LINK tools, and what are the physical interface requirements?

Yes. SWIM (Single Wire Interface Module) is fully supported by ST-LINK/V2 and ST-LINK/V2-1 debuggers using the standard 4-pin STDC14 connector. Only one signal (SWIM) plus GND is required for programming and debugging; no target power is supplied through the debugger - VDD must be provided externally during debug sessions.