STMicroelectronics STM8L151F3P6TR

Overview

STM8L151F3P6TR from STMicroelectronics is an 8-bit ultra-low-power microcontroller in UFQFPN20 (3×3 mm) package, featuring 8 KB Flash, 256-byte data EEPROM with ECC, 1 KB RAM, 12-bit ADC (1 Msps, 28 channels), two ultra-low-power comparators, RTC with ±0.5 ppm digital calibration, and five low-power modes including Halt with 5 µs wakeup. It targets battery-powered sensor nodes and portable medical devices requiring sub-µA standby current and robust timing integrity.

For engineers reviewing the STM8L151F3P6TR datasheet, STM8L151F3P6TR pinout, STM8L151F3P6TR application, or STM8L151F3P6TR equivalent, key selection criteria include verified 1.65–3.6 V operation without BOR, 41 I/Os mappable to interrupt vectors, capacitive touch support (up to 20 channels), SWIM-based non-intrusive debugging, and factory-trimmed 16 MHz RC oscillator with ±1% accuracy at 25 °C.

Technical Context

The STM8L151F3P6TR implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz max frequency and supporting up to 40 external interrupt sources. Its clock system integrates dual crystal oscillators (32 kHz LSE and 1–16 MHz HSE), internal 16 MHz HSI (factory-trimmed), and 38 kHz LSI, all managed by a clock security system detecting oscillator failure.

Power management includes programmable voltage detector (PVD), five selectable BOR thresholds (1.8–2.8 V), and ultra-low leakage I/Os (50 nA). The RTC operates autonomously in Active-halt mode with calendar, alarm, and auto-wakeup-enabled even when main regulator is off and powered solely by VBAT.

Key Specifications

Pinout & Package

STM8L151F3P6TR uses the UFQFPN20 (3×3 mm, 0.5 mm pitch) package with 20 terminals. All pins support interrupt mapping, and 19 are general-purpose I/Os (including 1 high-sink LED driver on PA0). NRST is dedicated reset; VDD/VSS pairs ensure stable core and I/O supply separation.

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, the STM8L151F3P6TR adds essential RTC and EEPROM for time-stamped logging; versus EFM8LB12F32ES1-QFP24, it delivers integrated timekeeping and touch sensing at lower system-level power and component count-critical for space-constrained, battery-operated endpoints.

Availability

STM8L151F3P6TR is available at Aetrix Electronics and suitable for smart metering nodes, portable medical sensors, industrial wireless sensors, and home automation controllers requiring stable component supply and long-term lifecycle assurance.

Supply support for STM8L151F3P6TR 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, specializing in microcontrollers, power management, sensors, and automotive ICs with strong focus on energy efficiency and industrial reliability.

The STM8L151 series belongs to ST's ultra-low-power 8-bit MCU product line, designed specifically for battery-operated and energy-harvesting applications demanding sub-microamp standby current, integrated analog peripherals, and robust real-time operation under wide voltage and temperature ranges.

FAQ

What is the minimum supply voltage for STM8L151F3P6TR with BOR enabled?

The minimum operating voltage with Brown-out Reset (BOR) enabled is 1.8 V, with five selectable BOR thresholds ranging from 1.8 V to 2.8 V. Below the selected threshold, the BOR circuit asserts reset to prevent erratic operation-critical for maintaining data integrity during battery discharge.

Does STM8L151F3P6TR support in-system programming via SWIM?

Yes, STM8L151F3P6TR supports fast on-chip programming and non-intrusive debugging through the single-wire SWIM interface (PC3 pin). No external debugger is required for firmware updates; host PC connects via ST-LINK/V2 or compatible adapter with standard SWIM protocol timing.

Can the internal 16 MHz RC oscillator be used for precise timing-critical applications?

The internal 16 MHz RC oscillator is factory-trimmed to ±1% accuracy at 25 °C and 3.0 V, with drift of ±2% over –40 to 85 °C. It is suitable for UART communication (with automatic baud rate error compensation) and general-purpose timing-but not for USB or high-accuracy clock generation, which require external crystals.

How many capacitive touch channels does STM8L151F3P6TR support in UFQFPN20 package?

The STM8L151F3P6TR supports up to 20 capacitive sensing channels, all accessible on its 19 GPIO pins (excluding NRST). The hardware-accelerated touch controller handles charge-transfer measurement, baseline tracking, and noise filtering-enabling robust touchkey, proximity, linear, and rotary implementations without CPU intervention.