STMicroelectronics STM8L151G2U3TR

Overview

STM8L151G2U3TR from STMicroelectronics is an 8-bit ultra-low-power microcontroller featuring 8 KB Flash, 256-byte data EEPROM with ECC, RTC, 12-bit ADC (up to 1 Msps), two ultra-low-power comparators, and multiple timers including TIM2/TIM3 (16-bit) and TIM4 (8-bit). 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 STM8L151G2U3TR datasheet, STM8L151G2U3TR pinout, STM8L151G2U3TR application, or STM8L151G2U3TR 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 support for up to 20 capacitive sensing channels.

Technical Context

The STM8L151G2U3TR 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 (LSE) for RTC.

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 selectable thresholds. The RTC supports auto-wakeup from Halt via periodic interrupt and digital calibration for precision timing.

Key Specifications

Pinout & Package

STM8L151G2U3TR is housed in a UFQFPN28 (4×4 mm, 0.5 mm pitch) package with 28 terminals, optimized for space-constrained ultra-low-power designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L152C2T6, STM8L151G2U3TR offers identical low-power architecture in a smaller 4×4 mm package with sufficient memory for basic sensing tasks; compared with STM32L011K4U6, it provides native capacitive sensing and simpler legacy toolchain support at the expense of ARM compatibility and peak processing throughput.

Availability

STM8L151G2U3TR 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 production continuity.

Supply support for STM8L151G2U3TR 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-harvesting applications where extended runtime, RTC precision, and integrated analog peripherals reduce system complexity and bill-of-materials cost.

FAQ

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

The STM8L151G2U3TR 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 current is 190 µA/MHz, resulting in ~3.04 mA total consumption-verified in DS7204 Rev 11 Table 19 under "Total current consumption in Run mode."

Does this MCU support hardware-accelerated capacitive sensing, and how many channels are available?

Yes, the STM8L151G2U3TR integrates a dedicated capacitive sensing controller supporting up to 20 channels. It enables touchkey, proximity, linear, and rotary touch without external components, with configurable scan speed and noise immunity-detailed in Section 3.11 and Table 1 of the datasheet.

What RTC accuracy can be achieved, and is calibration required?

The RTC achieves ±0.5 ppm accuracy after digital calibration, which is performed once during production and stored in option bytes. No user calibration is needed-the calibrated value is automatically applied at startup, enabling precise timekeeping over temperature and voltage variations.

Is SWIM debugging supported, and what pins are required?

Yes, SWIM (Single-Wire Interface Module) debugging is fully supported for non-intrusive on-chip programming and real-time debugging. Only one dedicated pin (SWIM) plus VDD and VSS are required-no UART or JTAG pins needed-making it ideal for minimal-pin-count designs as confirmed in Section 3.17 and Figure 1.