STMicroelectronics STM8L151C4T3

Overview

STM8L151C4T3 from STMicroelectronics is an 8-bit ultra-low-power microcontroller featuring 16 MHz STM8 core, 16 KB Flash, 1 KB Data EEPROM with ECC, 2 KB RAM, 12-bit ADC (1 Msps, 25 channels), 12-bit DAC, RTC with BCD calendar and auto-wakeup, and integrated capacitive touch sensing (16 channels). It operates from 1.65 V to 3.6 V and supports industrial temperature range (–40 °C to +85 °C), targeting battery-powered sensor nodes and portable medical devices.

For engineers reviewing the STM8L151C4T3 datasheet, STM8L151C4T3 pinout, STM8L151C4T3 application, or STM8L151C4T3 equivalent, key selection criteria include active-halt current (1.3 µA with RTC), fast wakeup time (4.7 µs), SWIM debug interface, LQFP48 package compatibility, and support for ISO 7816/IRDA via USART.

Technical Context

The STM8L151C4T3 implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. It integrates dual clock domains: high-speed (1–16 MHz HSE or 16 MHz factory-trimmed RC) and low-speed (32 kHz LSE or 38 kHz RC), managed by a clock security system with fail-safe detection.

Its power architecture includes five configurable low-power modes-Wait, Low Power Run (5.1 µA), Low Power Wait (3 µA), Active-Halt with full RTC (1.3 µA), and Halt (350 nA)-with per-pin leakage as low as 50 nA and guaranteed 4.7 µs wake-up from Halt mode using internal or external event triggers.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch), RoHS-compliant, ECOPACK®2, rated for industrial temperature range (–40 °C to +85 °C).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L052C6T6, STM8L151C4T3 adds RTC, DAC, and EEPROM ECC for enhanced reliability in time-aware systems; versus STM32L053R8T6, it offers lower development barrier for 8-bit firmware teams but trades off ARM ecosystem advantages and memory headroom.

Availability

STM8L151C4T3 is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, industrial wireless sensor nodes, and home appliance control panels requiring stable component supply across multi-year production cycles.

Supply support for STM8L151C4T3 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 MCU product line targets battery-operated and energy-harvesting applications where sub-µA sleep currents, fast wake-up, and integrated analog peripherals reduce system-level complexity and power consumption.

FAQ

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

The STM8L151C4T3 achieves a maximum 16 MHz clock frequency using the internal 16 MHz RC oscillator or external crystal. At 16 MHz and 3.0 V, typical active current is 195 µA/MHz + 440 µA, resulting in ~3.56 mA total. This value scales linearly with frequency and is validated across the full temperature range per DS6372 Rev 17 Table 20.

Does STM8L151C4T3 support hardware-accelerated capacitive touch sensing?

Yes-it integrates a dedicated Capacitive Sensing Controller (CTSU) supporting up to 16 channels with built-in charge-transfer measurement, noise filtering, and automatic recalibration. It enables touchkey, proximity, linear, and rotary touch interfaces without external components, as documented in Section 3.13 and Table 2 of DS6372 Rev 17.

What debug interface does STM8L151C4T3 use, and is JTAG supported?

The device uses SWIM (Single-Wire Interface Module) for on-chip programming and non-intrusive debugging. JTAG is not supported; SWIM requires only one pin (SWIM) plus NRST and power, enabling compact debug headers and in-system firmware updates without dedicated debug connectors.

How is RTC accuracy maintained during ultra-low-power Halt mode?

The RTC remains fully functional in Active-Halt mode using the 32 kHz LSE crystal oscillator (±20 ppm typical), preserving BCD calendar, alarm, and periodic wakeup functions. In Halt mode, RTC is disabled-but wakeup from Halt takes only 4.7 µs, allowing rapid resumption of time-critical tasks after external or internal interrupts.