STMicroelectronics STM8L151K6U3TR

Overview

STM8L151K6U3TR 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, RTC with BCD calendar, and dual ultra-low-power comparators. It operates from 1.65 V to 3.6 V across –40 °C to +85 °C and supports up to 41 I/Os with capacitive touch sensing - deployed in battery-powered smart meters and portable medical sensors.

For engineers reviewing the STM8L151K6U3TR datasheet, STM8L151K6U3TR pinout, STM8L151K6U3TR application, or STM8L151K6U3TR equivalent, key selection criteria include active-halt current (1.3 µA), Halt-mode wakeup time (4.7 µs), RTC calendar accuracy, LCD support exclusion (K6 variant), and SWIM debug interface compatibility.

Technical Context

The STM8L151K6U3TR implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz max. It integrates dual clock domains: high-speed (1–16 MHz HSE or 16 MHz factory-trimmed HSI) and low-power (32 kHz LSE or 38 kHz LSI), managed by a Clock Security System for fault detection.

Its power architecture includes five configurable low-power modes - including Active-halt with full RTC operation (1.3 µA) and Halt (350 nA) - enabled by programmable voltage detector (PVD), ultra-safe BOR with 5 thresholds, and per-pin leakage control (50 nA/I/O). The device lacks integrated LCD controller, confirming its STM8L151xx (non-LCD) family identity.

Key Specifications

Pinout & Package

STM8L151K6U3TR is housed in a 32-pin UFQFPN package (5 × 5 mm, 0.5 mm pitch), optimized for space-constrained portable designs. Pin functions are fully defined in ST's DS6372 Rev 17, Table 5.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L151K6U3TR, STM8L152K6T3 adds LCD capability at higher active power, while EFM8LB12F64E-B-QFN32 trades analog richness and RTC precision for RF robustness and larger Flash - making STM8L151K6U3TR optimal for cost-sensitive, battery-limited analog-sensing applications requiring guaranteed RTC accuracy and EEPROM reliability.

Availability

STM8L151K6U3TR is available at Aetrix Electronics and suitable for smart utility meters, portable medical sensors, wireless sensor nodes, and industrial temperature loggers requiring stable component supply and long-term lifecycle assurance.

Supply support for STM8L151K6U3TR 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, designing and manufacturing microcontrollers, power ICs, sensors, and analog devices for industrial, automotive, and consumer markets.

The STM8L ultra-low-power MCU product line targets energy-constrained applications such as battery-powered meters, wearables, and IoT edge nodes - emphasizing sub-µA sleep currents, integrated analog peripherals, and robust firmware security features.

FAQ

What is the maximum operating frequency and corresponding power consumption of STM8L151K6U3TR?

The STM8L151K6U3TR achieves a maximum CPU frequency of 16 MHz using the internal 16 MHz HSI oscillator or external HSE crystal. At 16 MHz and 3.0 V supply, typical active current is 195 µA/MHz + 440 µA = 3.56 mA. This value scales linearly with frequency and is validated per DS6372 Rev 17, Table 20.

Does STM8L151K6U3TR support capacitive touch sensing, and how many channels are available?

Yes, STM8L151K6U3TR integrates a dedicated Capacitive Sensing (CTS) peripheral supporting up to 16 channels. It enables touchkey, proximity, linear slider, and rotary touch applications without external components. Channel assignment is configurable via SYSCFG registers, and sensitivity is adjustable per channel using calibration registers defined in Section 3.13 of DS6372.

What debug interface does STM8L151K6U3TR use, and what are its key capabilities?

STM8L151K6U3TR uses the SWIM (Single-Wire Interface Module) debug interface, accessible via the SWIM pin. It supports non-intrusive on-chip programming, real-time variable inspection, breakpoint setting, and low-power mode entry/exit tracing - all over a single wire without requiring additional pins or halting CPU execution during debug sessions.

Is the 1 KB Data EEPROM truly EEPROM with endurance and retention specs, and does it include ECC?

Yes, the 1 KB Data EEPROM is a true EEPROM block with 300k write/erase cycles endurance and 20-year data retention at 85 °C. It incorporates hardware ECC (Error Correction Code) that detects and corrects single-bit errors transparently during read/write operations - verified in DS6372 Rev 17, Section 3.7 and Table 36.