STMicroelectronics STM8L151F3P6

Overview

STM8L151F3P6 from STMicroelectronics is an 8-bit ultra-low-power microcontroller featuring 8 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 beeper timer. It operates from 1.65–3.6 V across –40 to +85 °C and supports up to 20 capacitive sensing channels for touchkey and proximity applications in battery-powered IoT sensors and smart meters.

For engineers reviewing the STM8L151F3P6 datasheet, STM8L151F3P6 pinout, STM8L151F3P6 application, or STM8L151F3P6 equivalent, key selection criteria include ultra-low leakage per I/O (50 nA), fast Halt-mode wakeup (5 µs), BCD calendar RTC with ±0.5 ppm digital calibration, and SWIM-based non-intrusive debugging support.

Technical Context

The STM8L151F3P6 implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. Its clock system integrates three oscillators: 32 kHz LSE, 1–16 MHz HSE, and factory-trimmed 16 MHz HSI-plus a 38 kHz low-consumption LSI for autonomous RTC operation during Halt mode.

Power management includes five configurable low-power modes (Wait, Low-power Run, Low-power Wait, Active-halt with RTC, Halt), programmable voltage detector (PVD), and BOR with five selectable thresholds. The RTC remains active in Active-halt mode using LSE, enabling periodic wakeups without CPU intervention.

Key Specifications

Pinout & Package

STM8L151F3P6 is housed in a 20-pin UFQFPN (3 × 3 mm, 0.5 mm pitch) package with exposed thermal pad. This compact footprint supports space-constrained designs such as wearable health monitors and compact utility meters.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L051F3P6, STM8L151F3P6 adds RTC, EEPROM, and enhanced analog peripherals-justifying its use in time-aware metering. Versus STM32L011F4P6, it offers lower power in deep sleep and simpler firmware development, but less computational headroom for cryptographic or protocol processing.

Availability

STM8L151F3P6 is available at Aetrix Electronics and suitable for smart utility metering, wireless sensor nodes, wearable health monitors, and industrial control panels requiring stable component supply and long-term lifecycle assurance.

Supply support for STM8L151F3P6 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 product line targets battery-operated and energy-harvesting applications where sub-µA sleep current, fast wake-up, and integrated analog peripherals are critical-enabling multi-year operation without battery replacement.

FAQ

What is the maximum operating frequency and corresponding power supply range for STM8L151F3P6?

The STM8L151F3P6 achieves a maximum 16 MHz CPU frequency when supplied between 1.8 V and 3.6 V with Brown-out Reset (BOR) enabled. Without BOR, operation is guaranteed down to 1.65 V. At 1.65 V, the maximum safe frequency is reduced to 12 MHz per electrical characteristics tables in DS7204 Rev 11 Section 9.3.4.

Does STM8L151F3P6 support capacitive touch sensing, and how many channels are available?

Yes, STM8L151F3P6 supports up to 20 capacitive sensing channels using its integrated CTS (Capacitive Touch Sensing) controller. These channels can be configured for touchkey, proximity, linear slider, or rotary wheel interfaces without external components, leveraging dedicated charge-transfer measurement circuitry and hardware-accelerated filtering.

What debug interface does STM8L151F3P6 use, and what are its physical requirements?

STM8L151F3P6 uses the Single-Wire Interface Module (SWIM) for on-chip programming and non-intrusive debugging. It requires only one dedicated pin (SWIM), a ground connection, and a 5 V tolerant debug probe. No external crystal or additional pins are needed-making it ideal for space-constrained PCB layouts and field firmware updates.

How does the RTC maintain accuracy in low-power modes, and what calibration mechanism is used?

The RTC in STM8L151F3P6 maintains ±0.5 ppm accuracy in Active-halt mode using digital calibration against the 32.768 kHz LSE crystal. Calibration values are stored in option bytes and applied automatically during startup or wake-up, eliminating manual trimming and ensuring consistent timekeeping across temperature and voltage variations.