STMicroelectronics STM8L151K6U6TR

Overview

STM8L151K6U6TR 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 alarm, and up to 41 I/Os. It operates from 1.65 V to 3.6 V across –40 °C to +85 °C and targets battery-powered sensor nodes and portable medical devices.

For engineers reviewing the STM8L151K6U6TR datasheet, STM8L151K6U6TR pinout, STM8L151K6U6TR application, or STM8L151K6U6TR equivalent, key selection criteria include active-halt current (1.3 µA), Halt-mode wakeup time (4.7 µs), 96-bit unique ID, SWIM debug interface, and capacitive touch support for up to 16 channels.

Technical Context

The STM8L151K6U6TR 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 with fail-safe detection.

Its power architecture supports five 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 per-pin leakage as low as 50 nA and fast wake-up from Halt in 4.7 µs. The embedded voltage regulator enables stable operation down to 1.65 V.

Key Specifications

Pinout & Package

STM8L151K6U6TR is housed in a 32-pin UFQFPN package (5 × 5 mm, 0.5 mm pitch), optimized for space-constrained portable designs. Pin count and layout match the STM8L151K4/K6 family variant without LCD controller.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L152K6U6TR, this part removes LCD circuitry to reduce cost and package height; versus STM32L053R8T6, it trades 32-bit capability for smaller die size, simpler toolchain, and direct legacy code portability-ideal for resource-tight, long-lifecycle sensor endpoints.

Availability

STM8L151K6U6TR is available at Aetrix Electronics and suitable for smart metering nodes, portable medical sensors, industrial wireless sensors, and energy-harvesting IoT endpoints requiring stable component supply over extended production lifecycles.

Supply support for STM8L151K6U6TR 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 ICs, sensors, and analog components for industrial, automotive, and consumer markets.

This device belongs to the STM8L ultra-low-power MCU product line, engineered specifically for battery- and energy-harvesting–powered applications where sub-microamp sleep current, fast wake-up, and integrated analog peripherals are critical design requirements.

FAQ

What is the maximum operating frequency and corresponding power consumption of STM8L151K6U6TR?

The STM8L151K6U6TR achieves a maximum CPU frequency of 16 MHz using the internal 16 MHz RC oscillator (factory-trimmed to ±1%) or external crystal. At 16 MHz and 3.0 V, typical active-mode current is 195 µA/MHz + 440 µA = 3.56 mA. This includes core, Flash, and peripheral logic; actual consumption scales linearly with clock speed and enabled peripherals.

Does STM8L151K6U6TR support hardware-accelerated capacitive touch sensing?

Yes, it integrates a dedicated capacitive sensing controller supporting up to 16 channels with hardware charge-transfer measurement, automatic baseline tracking, and noise filtering. It enables robust touchkey, proximity, linear slider, and rotary wheel implementations without external components or CPU overhead-verified per AN4648 application note.

How does the RTC function in Halt mode, and what clock sources are supported?

In Halt mode, the RTC remains fully operational using the 32 kHz LSE crystal oscillator or the internal 38 kHz RC oscillator. It maintains BCD calendar, generates alarm interrupts, and triggers automatic wake-up at programmable intervals. LSE provides ±20 ppm accuracy; LSI offers ±40% tolerance but eliminates external crystal cost and board area.

Is SWIM debug supported in all low-power modes, and what are the entry requirements?

SWIM debug is accessible only from Run, Wait, and Low Power Wait modes-not from Active-Halt or Halt. To enter debug mode, the SWIM pin must be held low for ≥2 µs while VDD is stable; the interface remains active during Wait modes but requires wake-up sequence before resuming execution after halt-induced debug entry.