STMicroelectronics STM8L151G3U6

Overview

STM8L151G3U6 from STMicroelectronics is an 8-bit ultra-low-power microcontroller featuring 8 KB Flash, 256 bytes data EEPROM, RTC, 12-bit ADC (1 Msps, 28 channels), two 16-bit timers, and I²C/SPI/USART interfaces in a 28-pin UFQFPN 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.

For engineers reviewing the STM8L151G3U6 datasheet, STM8L151G3U6 pinout, STM8L151G3U6 application, or STM8L151G3U6 equivalent, key selection criteria include ultra-low-power mode support (Active-halt with RTC), integrated capacitive touch sensing (20 channels), and factory-trimmed 16 MHz RC oscillator for timing-critical embedded control without external crystals.

Technical Context

The STM8L151G3U6 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 for RTC, internal 38 kHz low-consumption RC, and factory-trimmed 16 MHz HSI with ±1% accuracy over voltage/temperature.

Power management includes five low-power modes-Wait, Low-power Run, Low-power Wait, Active-halt with RTC, and Halt-with per-I/O leakage as low as 50 nA and 5 µs wakeup from Halt. The RTC supports BCD calendar, alarm interrupt, digital calibration (±0.5 ppm), and auto-wakeup via periodic interrupt.

Key Specifications

Pinout & Package

STM8L151G3U6 is housed in a 28-pin UFQFPN (4 × 4 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are validated per STMicroelectronics DS7204 Rev 11, Figure 5 (UFQFPN28 pinout).

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, STM8L151G3U6 adds RTC and capacitive sensing at modest cost premium; versus STM32L011D4P6, it delivers lower active and standby current with simpler development flow-ideal for deeply embedded, battery-limited designs where 8-bit throughput suffices.

Availability

STM8L151G3U6 is available at Aetrix Electronics and suitable for smart wearables, portable medical monitors, industrial wireless sensors, and energy-harvesting environmental loggers requiring stable component supply and long-term production continuity.

Supply support for STM8L151G3U6 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 STM8L ultra-low-power MCU product line targets battery-operated and energy-constrained applications-delivering sub-microamp sleep currents, integrated analog peripherals, and robust firmware protection for long-life embedded deployments.

FAQ

What is the maximum operating frequency and how is it achieved?

The STM8L151G3U6 achieves a maximum 16 MHz CPU frequency using its internal factory-trimmed 16 MHz RC oscillator, which maintains ±1% accuracy across 1.65–3.6 V and –40 to +85 °C. External crystal options (1–16 MHz HSE or 32 kHz LSE) are also supported, but the trimmed RC eliminates BOM cost and board space for timing components while meeting timing-critical real-time control needs.

Does STM8L151G3U6 support hardware-based capacitive touch sensing?

Yes-it integrates a dedicated capacitive sensing controller supporting up to 20 channels with hardware-accelerated acquisition, automatic baseline tracking, and noise filtering. It supports touchkey, proximity, linear slider, and rotary wheel configurations without external components or CPU intervention, enabling robust touch UIs in space-constrained portable devices.

How does the RTC maintain accuracy in ultra-low-power mode?

The RTC uses the 32 kHz LSE crystal oscillator with digital calibration achieving ±0.5 ppm accuracy. It remains active in Active-halt mode (0.3 µA typical), supports BCD calendar, alarm interrupt, and auto-wakeup via periodic interrupt-all while maintaining timekeeping integrity across power cycles and temperature variations from –40 to +85 °C.

What debug interface does STM8L151G3U6 use and what are its advantages?

It uses SWIM (Single-Wire Interface Module)-a proprietary STMicroelectronics debug/programming interface requiring only one pin (SWIM) plus VDD/VSS. SWIM enables non-intrusive on-chip debugging, fast flash programming, and full memory access without dedicated JTAG/SWD pins, reducing PCB routing complexity and pin count in compact 28-pin UFQFPN layouts.