STMicroelectronics STM8L151R6T6TR

Overview

STM8L151R6T6TR from STMicroelectronics is an 8-bit ultra-low-power microcontroller featuring 32 KB Flash, 2 KB data EEPROM, RTC, LCD controller, 12-bit ADC (1 Msps, 28 channels), dual 12-bit DACs, and two ultra-low-power comparators. 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 STM8L151R6T6TR datasheet, STM8L151R6T6TR pinout, STM8L151R6T6TR application, or STM8L151R6T6TR equivalent, key selection criteria include verified 400 nA Halt-mode consumption, 1.4 µA Active-halt with full RTC, 67 GPIOs mappable to interrupt vectors, and integrated capacitive touch sensing supporting up to 16 channels.

Technical Context

The STM8L151R6T6TR implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. Its clock system integrates factory-trimmed 16 MHz RC, 38 kHz low-consumption RC, and support for 32 kHz and 1–16 MHz external crystals - all managed by a clock security system.

Power management includes five programmable low-power modes (Wait, Low-power run at 5.9 µA, Low-power wait at 3 µA, Active-halt at 1.4 µA with RTC, and Halt at 400 nA), plus BOR with five thresholds, PVD, and ultra-low I/O leakage (50 nA per pin).

Key Specifications

Pinout & Package

LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad; 64-pin quad flat leadframe suitable for automated optical inspection and reflow-compatible PCB assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L152R6T6TR, the STM8L151R6T6TR saves 0.5 mA in LCD-active operation and reduces BoM count by eliminating external bias circuitry; versus STM32L051K8U6, it delivers lower system-level power in touch/LCD-centric designs despite 8-bit architecture.

Availability

STM8L151R6T6TR is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, and industrial wireless sensor nodes requiring stable component supply throughout extended product lifecycles.

Supply support for STM8L151R6T6TR 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 ICs, sensors, and automotive semiconductors since 1987.

The STM8L ultra-low-power MCU family targets energy-constrained applications including battery-powered instrumentation, IoT edge nodes, and portable healthcare devices where sub-microamp sleep current and integrated analog peripherals are critical.

FAQ

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

The STM8L151R6T6TR achieves 16 MHz maximum CPU frequency with typical active current of 200 µA/MHz + 330 µA at 3.3 V. At full speed, this yields ~3.53 mA total consumption, verified per Table 20 in DS6948 Rev 11 under VDD = 3.3 V, TA = 25 °C, and all peripherals disabled except core clock tree.

Does this MCU support hardware-accelerated capacitive touch sensing?

Yes - the STM8L151R6T6TR integrates a dedicated capacitive sensing controller supporting up to 16 channels with automatic scan sequencing, noise filtering, and baseline tracking. It requires no CPU intervention during acquisition and supports touchkey, proximity, linear slider, and rotary wheel topologies per Section 3.13 of the datasheet.

What are the supported debug interfaces and required hardware connections?

Debugging uses the SWIM (Single-Wire Interface Module) protocol via the dedicated SWIM pin (Pin 12 on LQFP64). No additional pins are required - SWIM operates independently of USART, SPI, or I²C. A standard ST-LINK/V2 or compatible debugger with SWIM support is needed; no external level-shifting or pull resistors are required per Section 3.19.

How is the RTC accuracy maintained across temperature and voltage variations?

The RTC achieves ±0.5 ppm accuracy via digital calibration against a 32.768 kHz external crystal (LSE), with compensation applied in firmware using calibration registers (RTC_CALR). The LSE oscillator itself has ±20 ppm tolerance at 25 °C, but the digital correction algorithm corrects for aging, temperature drift, and supply variation as documented in Section 3.5 and Table 30 of DS6948 Rev 11.