STMicroelectronics STM8L151F2U6TR

Overview

STM8L151F2U6TR from STMicroelectronics is an 8-bit ultra-low-power microcontroller featuring 4 KB Flash, 256 bytes data EEPROM, RTC, 12-bit ADC (1 Msps), two ultra-low-power comparators, and multiple timers-including two 16-bit general-purpose timers and one 8-bit basic timer-in a 20-pin UFQFPN (3×3 mm) package. It operates from 1.65–3.6 V across –40 to +85 °C and targets battery-powered sensor nodes and portable medical devices requiring sub-μA sleep current and fast 5 µs wakeup from Halt mode.

For engineers reviewing the STM8L151F2U6TR datasheet, STM8L151F2U6TR pinout, STM8L151F2U6TR application, or STM8L151F2U6TR equivalent, key selection criteria include verified ultra-low-power run/wait/Halt current consumption, integrated RTC with digital calibration (±0.5 ppm), 20 I/Os with interrupt mapping, capacitive touch support (up to 20 channels), and SWIM-based non-intrusive debugging.

Technical Context

The STM8L151F2U6TR implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz max CPU frequency. Its clock system integrates three oscillators: factory-trimmed 16 MHz RC, 38 kHz low-consumption RC, and external 32 kHz crystal-managed by a clock security system that triggers reset on oscillator failure.

Power management includes five low-power modes (Wait, Low-power Run, Low-power Wait, Active-halt with RTC, Halt), BOR with five selectable thresholds, and programmable voltage detector (PVD). The 12-bit ADC supports up to 28 channels with internal temperature sensor and reference voltage, while two rail-to-rail comparators provide wakeup capability and fixed-threshold detection.

Key Specifications

Pinout & Package

STM8L151F2U6TR uses a 20-pin UFQFPN (3×3 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are fully defined per ST's DS7204 Rev 11, Section 4.1 and Figure 6.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L051F3P6, STM8L151F2U6TR adds RTC, EEPROM, and enhanced low-power modes critical for time-stamped logging; versus EFM8LB12F32ES1-QFP20, it delivers 5× lower Halt current and integrated touch sensing-reducing BOM and simplifying layout for compact battery-powered designs.

Availability

STM8L151F2U6TR is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, industrial wireless sensor nodes, and home automation controllers requiring stable component supply across extended product lifecycles.

Supply support for STM8L151F2U6TR 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, sensors, and analog products for industrial, automotive, and consumer markets.

The STM8L151 series belongs to ST's ultra-low-power 8-bit MCU product line, engineered specifically for energy-constrained applications where sub-microamp sleep current, integrated RTC, and capacitive touch capability are mandatory design requirements.

FAQ

What is the maximum operating frequency and corresponding power consumption in Run mode?

The STM8L151F2U6TR achieves 16 MHz CPU frequency using its internal 16 MHz RC oscillator. At VDD = 3.0 V and 16 MHz, typical Run mode current is 190 µA/MHz (5.7 mA total), as specified in Table 19 of DS7204 Rev 11. This value assumes all peripherals disabled except core and flash.

Does STM8L151F2U6TR support hardware-accelerated capacitive touch sensing?

Yes-it integrates a dedicated Capacitive Sensing Controller (TS) supporting up to 20 channels. It provides hardware charge-transfer measurement, automatic baseline tracking, and noise filtering, enabling robust touchkey, proximity, linear, and rotary touch interfaces without external components or CPU overhead.

What are the validated clock sources for RTC operation, and what accuracy can be achieved?

The RTC is clocked exclusively by the 32.768 kHz external LSE crystal. With digital calibration enabled, the RTC achieves ±0.5 ppm accuracy over temperature and voltage, as confirmed in Section 3.5 and Table 31 of DS7204 Rev 11. Internal LSI is not used for RTC in production-grade timing applications.

Is SWIM debugging supported in all low-power modes, and what pins are required?

SWIM debugging remains active in Run, Wait, and Low-power Run modes but is disabled in Low-power Wait, Active-halt, and Halt modes. Only one pin-SWIM (PB4 in default configuration)-is required for both programming and debugging, eliminating need for JTAG/SWD headers and reducing PCB routing complexity.