STMicroelectronics STM8L151F3P3

Overview

STM8L151F3P3 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 multiple low-power modes including Halt with 5 µs wakeup. It targets battery-powered sensor nodes and portable medical devices requiring long runtime and precise timing.

For engineers reviewing the STM8L151F3P3 datasheet, STM8L151F3P3 pinout, STM8L151F3P3 application, or STM8L151F3P3 equivalent, key selection criteria include its 1.65–3.6 V operating range, 50 nA I/O leakage, 16 MHz max CPU frequency, and integrated capacitive touch sensing support for up to 20 channels.

Technical Context

The STM8L151F3P3 implements a Harvard-architecture STM8 core with 3-stage pipeline and 16 CISC MIPS peak performance at 16 MHz. Its clock system includes factory-trimmed 16 MHz RC, 38 kHz low-consumption RC, and dual crystal oscillator support (32 kHz LSE + 1–16 MHz HSE).

Power management integrates five low-power modes-Wait, Low-power Run, Low-power Wait, Active-halt with RTC, and Halt-with BOR reset thresholds selectable across five levels and programmable voltage detector (PVD). The RTC operates autonomously in Active-halt mode with periodic auto-wakeup capability.

Key Specifications

Pinout & Package

STM8L151F3P3 uses the UFQFPN20 (3×3 mm, 0.5 mm pitch) package with 20 terminals. Pin functions are optimized for minimal external components in space-constrained designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L051F3P3, the STM8L151F3P3 adds RTC, DMA, and higher-resolution ADC - essential for time-stamped sensor logging. Versus STM8L152C6T6, it trades package size and USB for lower BOM cost and smaller PCB footprint in compact nodes.

Availability

STM8L151F3P3 is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, and industrial wireless sensor nodes requiring stable component supply and long-term manufacturability.

Supply support for STM8L151F3P3 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.

The STM8L ultra-low-power MCU product line targets energy-constrained applications such as battery-operated meters, wearables, and industrial sensors where sub-µA sleep currents and robust peripheral integration are mandatory.

FAQ

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

The STM8L151F3P3 achieves a maximum CPU frequency of 16 MHz using the internal 16 MHz RC oscillator or external HSE. At VDD = 3.0 V and fCPU = 16 MHz, typical active-mode current is 190 µA/MHz, resulting in ~3.04 mA total consumption - verified per DS7204 Rev 11 Table 19.

Does the device support hardware-based capacitive touch sensing without external components?

Yes - the STM8L151F3P3 integrates a dedicated capacitive sensing controller supporting up to 20 channels. It requires only series resistors (typically 100 kΩ) on each sense line and no external oscillator or charge-transfer IC, enabling robust touchkey and proximity detection per AN4603 and RM0031.

How is RTC accuracy maintained across temperature and voltage variations?

The RTC uses a digitally calibrated 32.768 kHz LSE oscillator with ±0.5 ppm accuracy over -40 to +85 °C. Calibration coefficients are stored in option bytes and applied automatically; LSE security system detects crystal faults and triggers interrupts to prevent time drift.

Can the internal 12-bit ADC measure signals below the VDD reference?

Yes - the ADC supports external VREF+ down to 1.8 V and internal 1.22 V reference. When VREF+ = 1.8 V, full-scale range is 0–1.8 V with 439 µV LSB resolution; accuracy remains ±1.5 LSB INL/DNL per DS7204 Rev 11 Table 48 and Table 51.