STMicroelectronics STM8L151K4U6TR

Overview

STM8L151K4U6TR 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, 12-bit ADC (1 Msps, 25 channels), 12-bit DAC, RTC with BCD calendar, and 32-pin UFQFPN package. It supports five low-power modes down to 350 nA in Halt and delivers 195 µA/MHz active current for battery-powered sensor nodes and portable medical devices.

For engineers reviewing the STM8L151K4U6TR datasheet, STM8L151K4U6TR pinout, STM8L151K4U6TR application, or STM8L151K4U6TR equivalent, key selection criteria include ultra-low static current (350 nA Halt), integrated RTC with auto-wakeup, capacitive touch sensing (16 channels), SWIM debug interface, and 1.65–3.6 V operating range for energy-constrained embedded systems.

Technical Context

The STM8L151K4U6TR 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 failover detection.

Its power architecture includes programmable voltage detector (PVD), ultra-safe BOR with 5 thresholds, and independent regulators for digital/analog domains. The RTC operates autonomously in Active-halt mode (1.3 µA) using external 32 kHz crystal, enabling precise timekeeping during deep sleep.

Key Specifications

Pinout & Package

STM8L151K4U6TR uses a 32-pin UFQFPN (5 × 5 mm, 0.5 mm pitch) package with wettable flank leads for automated optical inspection. Pin functions are fully mappable to interrupt vectors, supporting flexible PCB layout and signal routing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L051F3P6TR, STM8L151K4U6TR adds RTC, DAC, and touch sensing at modest cost premium; versus STM32L011K4U6TR, it delivers identical packaging and lower active/Halt current but trades 32-bit flexibility for deterministic 8-bit execution.

Availability

STM8L151K4U6TR is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, industrial wireless sensor nodes, and home automation touch panels requiring stable component supply across multi-year production cycles.

Supply support for STM8L151K4U6TR 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 products for industrial, automotive, and consumer markets.

The STM8L ultra-low-power MCU family targets energy-critical applications such as battery-operated meters, wearables, and IoT edge nodes - prioritizing sub-µA sleep current, integrated peripherals, and long-term supply stability.

FAQ

What is the maximum operating frequency and corresponding power consumption of STM8L151K4U6TR?

The STM8L151K4U6TR operates up to 16 MHz using its internal 16 MHz RC oscillator (factory-trimmed to ±1%) or external crystal. At 16 MHz and 3.0 V, typical active current is 195 µA/MHz + 440 µA = 3.56 mA. This includes core, Flash, and peripheral operation - verified per DS6372 Rev 17 Table 20.

Does STM8L151K4U6TR support hardware-accelerated capacitive touch sensing?

Yes. It integrates a dedicated Capacitive Sensing GPIO (CSG) peripheral supporting up to 16 channels. It performs autonomous charge-transfer measurement with built-in baseline tracking and noise filtering - eliminating CPU intervention for touch detection and enabling <10 µs response latency per channel.

What debug interface does STM8L151K4U6TR use, and what pins are required?

It uses the SWIM (Single-Wire Interface Module) debug interface, requiring only one bidirectional pin (SWIM, pin 12 on UFQFPN32) plus VDD and VSS. SWIM supports full-speed programming, real-time variable inspection, and breakpoint debugging without halting peripherals - confirmed in Section 3.19 of DS6372 Rev 17.

Can STM8L151K4U6TR retain RTC time and data during complete power loss?

No. The RTC requires VDD supply to maintain timekeeping; it has no separate VBAT pin. However, the 1.3 µA Active-halt mode (with external 32 kHz crystal) preserves RTC calendar, alarms, and registers during main power sleep - verified in Table 24 and Section 3.5 of DS6372 Rev 17.