STMicroelectronics STM8L151G3U6TR

Overview

STM8L151G3U6TR from STMicroelectronics is an 8-bit ultra-low-power microcontroller featuring 8 KB Flash, 256-byte data EEPROM with ECC, RTC with ±0.5 ppm digital calibration, 12-bit ADC (1 Msps, 28 channels), two ultra-low-power comparators, and capacitive touch sensing support. It operates from 1.65–3.6 V across –40 to +85 °C and targets battery-powered sensor nodes and portable medical devices.

For engineers reviewing the STM8L151G3U6TR datasheet, STM8L151G3U6TR pinout, STM8L151G3U6TR application, or STM8L151G3U6TR equivalent, key selection criteria include active-halt mode current (200 nA @ 3 V), 5 µs wakeup from Halt, 41 I/Os with interrupt mapping, and UFQFPN28 package compatibility for space-constrained designs.

Technical Context

The STM8L151G3U6TR implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. Its clock system integrates three oscillators: factory-trimmed 16 MHz RC, 38 kHz low-consumption RC, and external 32 kHz crystal-each selectable via clock security system for fail-safe operation.

Power management includes five low-power modes (Wait, Low-power Run, Low-power Wait, Active-halt with RTC, Halt), programmable voltage detector (PVD), and BOR with five threshold options. The RTC supports BCD calendar, alarm interrupt, and auto-wakeup with periodic interrupt while in Halt mode.

Key Specifications

Pinout & Package

STM8L151G3U6TR is housed in a 28-pin UFQFPN (4 × 4 mm, 0.5 mm pitch) package with wettable flanks, optimized for automated optical inspection and high-density PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L052C6T6, STM8L151G3U6TR adds RTC, EEPROM, and capacitive touch-critical for time-stamped logging and UI. Versus STM32L011K4U6, it trades 32-bit capability for lower active current and simpler toolchain, favoring cost-sensitive, long-life battery designs.

Availability

STM8L151G3U6TR 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 lifecycle assurance.

Supply support for STM8L151G3U6TR 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, and MEMS sensors for industrial, automotive, and consumer markets.

The STM8L ultra-low-power MCU product line targets energy-constrained applications such as battery-operated sensors, wearables, and smart meters-emphasizing sub-µA sleep currents, fast wakeups, and integrated analog peripherals.

FAQ

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

The STM8L151G3U6TR achieves 16 MHz maximum clock frequency with a supply voltage of 1.8–3.6 V when Brown-Out Reset (BOR) is enabled, or 1.65–3.6 V when BOR is disabled. This dual-range operation allows flexibility in low-voltage battery systems where BOR may be intentionally disabled to extend end-of-life runtime.

Does this MCU support capacitive touch sensing without external components?

Yes-STM8L151G3U6TR integrates hardware-accelerated capacitive sensing logic supporting up to 20 channels. It requires no external RC networks or dedicated touch controller ICs, enabling direct implementation of touchkeys, linear sliders, and rotary encoders using standard GPIOs and internal charge-transfer measurement.

How does the RTC maintain accuracy across temperature and voltage variations?

The RTC uses digital calibration against the 32 kHz LSE crystal oscillator, achieving ±0.5 ppm accuracy. Calibration coefficients are stored in option bytes and applied dynamically, compensating for crystal aging and temperature-induced drift without external circuitry or software intervention.

What debug interface does STM8L151G3U6TR use, and what are its physical requirements?

It uses the SWIM (Single-Wire Interface Module) debug interface, requiring only one dedicated pin (SWIM) plus VDD and VSS. No UART or JTAG header is needed-programming and non-intrusive debugging are supported through this single-wire connection, reducing PCB routing complexity and test point count.