STMicroelectronics STM8L151C4T6

Overview

STM8L151C4T6 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 calendar and alarm, and 41 GPIOs. It operates from 1.65 V to 3.6 V across –40 °C to +85 °C and targets battery-powered sensor nodes and portable medical devices.

For engineers reviewing the STM8L151C4T6 datasheet, STM8L151C4T6 pinout, STM8L151C4T6 application, or STM8L151C4T6 equivalent, key selection criteria include active-halt current (1.3 µA with RTC), fast wakeup (4.7 µs), capacitive touch support (16 channels), SWIM debug interface, and LQFP48 package compatibility with legacy STM8L designs.

Technical Context

The STM8L151C4T6 implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. It integrates dual clock domains: high-speed (HSE up to 16 MHz, HSI 16 MHz factory-trimmed) and low-speed (LSE 32 kHz, LSI 38 kHz), managed by a clock security system with failover detection.

Its power architecture supports five distinct low-power modes - including Active-halt (1.3 µA with RTC running on LSE) and Halt (350 nA) - enabled by programmable voltage detector (PVD), ultra-low-leakage I/Os (50 nA per pin), and independent BOR with five threshold options for robust brownout recovery.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch), RoHS-compliant, ECOPACK2, with 41 user-configurable I/Os - all mappable to interrupt vectors and supporting capacitive sensing, analog inputs, and true open-drain outputs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L051F3P6, the STM8L151C4T6 delivers full RTC, DAC, and enhanced memory for autonomous sensing; versus STM8L152C4T6, it avoids LCD-related silicon overhead and cost where display is absent - making it optimal for compact, battery-sensitive embedded control.

Availability

STM8L151C4T6 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 and long-term production continuity.

Supply support for STM8L151C4T6 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 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 to minimize external component count.

FAQ

What is the maximum operating frequency and corresponding power consumption of the STM8L151C4T6?

The STM8L151C4T6 operates at up to 16 MHz using its internal 16 MHz RC oscillator (factory-trimmed to ±1%) or external crystal. At 16 MHz and 3.0 V, typical active-mode current is 195 µA/MHz + 440 µA - totaling ~3.56 mA. This includes core, Flash, and peripheral operation, verified per DS6372 Rev 17 Table 20.

Does the STM8L151C4T6 support hardware-accelerated capacitive touch sensing?

Yes - it integrates a dedicated hardware touch sensing controller supporting up to 16 channels. It enables touchkey, linear slider, rotary wheel, and proximity sensing without CPU intervention, using built-in charge-transfer measurement and noise filtering. This capability is confirmed in Section 3.13 and Table 2 of DS6372 Rev 17.

Can the STM8L151C4T6 retain RTC functionality while in the lowest power state?

Yes - in Active-halt mode, the device consumes just 1.3 µA while maintaining full RTC operation (calendar, alarm, periodic wakeup) powered by the 32 kHz LSE crystal. This is explicitly specified in Section 3.5 and Table 24 of the datasheet, enabling timekeeping during extended sleep periods.

Is SWIM debugging supported on the STM8L151C4T6, and what pins are required?

Yes - Single-Wire Interface Module (SWIM) is fully supported for non-intrusive debugging and programming. Only two connections are needed: SWIM (pin 11 on LQFP48) and NRST (pin 1). No additional clock or data lines are required, enabling compact in-system development as documented in Section 3.19 and Figure 3 of DS6372 Rev 17.