STMicroelectronics STM8L151C2T6

Overview

STM8L151C2T6 from STMicroelectronics is an 8-bit ultra-low-power microcontroller featuring 8 KB Flash, 256 bytes data EEPROM, RTC, 12-bit ADC (1 Msps), two ultra-low-power comparators, and multiple timers-including two 16-bit general-purpose timers and one beeper timer. 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 STM8L151C2T6 datasheet, STM8L151C2T6 pinout, STM8L151C2T6 application, or STM8L151C2T6 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 STM8L151C2T6 implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. It integrates a clock security system, programmable voltage detector (PVD), and dual oscillator support-16 MHz factory-trimmed RC and 32 kHz LSE-with automatic failover.

Its low-power architecture includes five distinct modes: Wait, Low-power Run, Low-power Wait, Active-halt with RTC, and Halt. The RTC operates independently in Active-halt mode using the LSE crystal, enabling periodic wakeups while consuming only 0.3 µA typical current.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch) package with 41 user-configurable I/Os, all mappable to interrupt vectors. Includes dedicated pins for LSE/LSI/HSE oscillators, SWIM debug interface, and NRST with integrated pull-up.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L051F3P6, the STM8L151C2T6 adds RTC, DMA, and capacitive sensing-justifying its use in time-aware sensor nodes. Against STM32L011K4T6, it offers lower interrupt latency and simpler firmware development at the cost of 32-bit ecosystem advantages.

Availability

STM8L151C2T6 is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, industrial wireless sensor nodes, and home automation touch panels requiring stable component supply across long product lifecycles.

Supply support for STM8L151C2T6 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, designing and manufacturing microcontrollers, power management ICs, sensors, and analog components for industrial, automotive, and consumer markets.

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

FAQ

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

The STM8L151C2T6 achieves a maximum CPU frequency of 16 MHz. It supports this speed across the full operating voltage range of 1.65 V to 3.6 V when the Brown-out Reset (BOR) is disabled. With BOR enabled, the minimum supply rises to 1.8 V to ensure reliable reset behavior under voltage transients.

Does the device support hardware-accelerated capacitive sensing, and how many channels are available?

Yes, the STM8L151C2T6 integrates a dedicated capacitive sensing controller supporting up to 20 channels. It enables touchkey, proximity, linear, and rotary touch interfaces without external components, using charge-transfer measurement with automatic baseline compensation and noise filtering.

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

The RTC uses a 32.768 kHz external LSE crystal and includes digital calibration capable of compensating for ±0.5 ppm error. Calibration coefficients are stored in option bytes and applied in real time, ensuring BCD calendar accuracy across –40 to +85 °C and 1.65–3.6 V supply range.

Can the SWIM interface be used for both programming and real-time debugging?

Yes, the single-wire SWIM interface supports full-speed on-chip programming, non-intrusive real-time debugging, and memory inspection-even while the application runs. It requires only one pin (SWIM) and ground, eliminating the need for multi-pin debug headers in space-constrained designs.