STMicroelectronics STM8L151R6T6

Overview

STM8L151R6T6 from STMicroelectronics is an 8-bit ultra-low-power microcontroller featuring 32 KB Flash, 2 KB data EEPROM, RTC with ±0.5 ppm digital calibration, 12-bit ADC (1 Msps, 28 channels), dual 12-bit DACs, and LCD controller supporting 8×40 segments. 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.

For engineers reviewing the STM8L151R6T6 datasheet, STM8L151R6T6 pinout, STM8L151R6T6 application, or STM8L151R6T6 equivalent, key selection criteria include active-halt mode current (1.4 µA with full RTC), 67 GPIOs mappable to interrupt vectors, capacitive touch support (16 channels), SWIM debug interface, and LQFP64 package compatibility with industrial-grade thermal performance.

Technical Context

The STM8L151R6T6 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 38 kHz low-consumption RC with clock security system.

Power management includes five programmable 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 fast wake-up (4.7 µs from Halt) and per-pin leakage as low as 50 nA.

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad; 64-pin quad flat configuration optimized for industrial PCB layout and thermal dissipation 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 STM8L152R6T6, the STM8L151R6T6 reduces BOM cost by omitting LCD hardware while retaining identical power profiles and peripheral count except LCD/DMA. Against STM32L051K8U6, it trades 32-bit capability for lower gate count, simpler toolchain, and dedicated touch sensing-making it optimal for deeply embedded, resource-constrained sensing nodes.

Availability

STM8L151R6T6 is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, and industrial wireless sensor nodes requiring stable component supply, long-term lifecycle assurance, and industrial temperature grade (–40 to +85 °C).

Supply support for STM8L151R6T6 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 since 1987.

The STM8L ultra-low-power 8-bit MCU family targets battery-operated and energy-harvesting applications where sub-microamp sleep current, RTC precision, and integrated analog peripherals reduce system-level component count and power budget.

FAQ

What is the maximum operating frequency and corresponding power consumption of the STM8L151R6T6?

The STM8L151R6T6 achieves a maximum CPU frequency of 16 MHz using its internal 16 MHz RC oscillator or external HSE crystal. At this speed and VDD = 3.3 V, typical active-mode current is 200 µA/MHz + 330 µA, resulting in ~3.53 mA total. This value scales linearly with clock speed and voltage, and drops to 5.9 µA in Low-power run mode at reduced frequency.

Does the STM8L151R6T6 support hardware-accelerated capacitive touch sensing?

Yes, the STM8L151R6T6 integrates a dedicated capacitive sensing controller (TS) supporting up to 16 channels. It provides hardware charge-transfer measurement, noise filtering, and baseline tracking-enabling robust touchkey, proximity, linear slider, and rotary encoder implementations without external components or CPU overhead.

How does the RTC achieve ±0.5 ppm accuracy, and what calibration method is used?

The RTC achieves ±0.5 ppm accuracy via digital calibration against the 32.768 kHz LSE crystal, using a 16-bit calibration register that adjusts the RTC prescaler in fine steps. Calibration is performed once during production and stored in option bytes; it compensates for crystal aging and temperature drift without requiring external trim components or runtime recalibration.

Can the STM8L151R6T6 be programmed and debugged in-system without dedicated debug headers?

Yes, the STM8L151R6T6 supports Single-Wire Interface Module (SWIM) debugging and programming using only the NRST pin and VDD/GND. This allows non-intrusive in-circuit programming and real-time variable inspection without reserving dedicated debug pins, reducing PCB layer count and simplifying production test fixtures.