STMicroelectronics STM8L151C8U6TR

Overview

STM8L151C8U6TR from STMicroelectronics is an 8-bit ultra-low-power microcontroller featuring 64 KB Flash, 2 KB data EEPROM, RTC, LCD controller, 12-bit ADC (1 Msps, 28 channels), dual 12-bit DACs, and three USARTs. It operates from 1.65–3.6 V across –40 to +85 °C and targets battery-powered metering, portable medical devices, and smart sensors requiring sub-µA sleep current and fast wake-up.

For engineers reviewing the STM8L151C8U6TR datasheet, STM8L151C8U6TR pinout, STM8L151C8U6TR application, or STM8L151C8U6TR equivalent, key selection criteria include active-halt mode current (1.4 µA with full RTC), 47-ns wake-up time from Halt, 67 I/Os with interrupt mapping, and integrated capacitive touch sensing (16 channels) for human-interface designs.

Technical Context

The STM8L151C8U6TR implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. Its clock system integrates dual crystal oscillators (32 kHz LSE + 1–16 MHz HSE), factory-trimmed 16 MHz RC, and clock security system for fail-safe operation.

Power management includes five low-power modes-Halt (400 nA), Active-halt (1.4 µA with RTC), Low-power wait (3 µA), Low-power run (5.9 µA), and Wait-with programmable BOR thresholds and PVD. The RTC supports BCD calendar, digital calibration (±0.5 ppm), and anti-tamper detection.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant, industrial-grade reliability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L152C8U6TR, the STM8L151C8U6TR omits LCD hardware-reducing die size and cost-while matching all other low-power peripherals and memory. Versus STM32L011K4U6, it provides EEPROM persistence and simpler toolchain migration but trades 32-bit scalability for deterministic 8-bit timing.

Availability

STM8L151C8U6TR is available at Aetrix Electronics and suitable for smart metering, portable diagnostics, and industrial sensor nodes requiring stable component supply, long-lifecycle assurance, and consistent parametric performance across temperature extremes.

Supply support for STM8L151C8U6TR 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 automotive semiconductors.

The STM8L ultra-low-power family targets energy-constrained applications such as battery-operated meters, wearables, and IoT edge nodes-prioritizing nanowatt sleep modes, integrated analog peripherals, and robust industrial qualification.

FAQ

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

The STM8L151C8U6TR achieves 16 MHz maximum clock frequency. At 16 MHz and 3.0 V, typical Run mode current is 200 µA/MHz + 330 µA, totaling ~3.53 mA. This value scales linearly with frequency and voltage, and includes core, Flash, RAM, and active peripherals.

Does this MCU support hardware-based capacitive touch sensing without external components?

Yes. The STM8L151C8U6TR integrates a dedicated capacitive sensing controller supporting up to 16 channels. It performs auto-calibration, baseline tracking, and noise filtering in hardware, enabling touchkey, proximity, linear, and rotary touch interfaces using only PCB traces-no external ICs or RC networks required.

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

The RTC uses a digitally calibrated 32 kHz LSE oscillator with ±0.5 ppm accuracy over –40 to +85 °C. Calibration is performed at factory trim and stored in option bytes; runtime compensation adjusts for aging and temperature drift using internal temperature sensor readings and lookup tables.

Can the dual DAC outputs operate simultaneously with independent update triggers?

Yes. Both 12-bit DACs support independent triggering via TIM2/TIM3/TIM5 events or software writes. They can be configured for synchronous or asynchronous updates, and their buffered outputs drive loads up to 100 kΩ while maintaining monotonicity and <±1 LSB INL across 0–VDD range.