STMicroelectronics STM8L151C3T6

Overview

STM8L151C3T6 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-designed for battery-powered sensor nodes and portable medical devices operating at 1.65–3.6 V.

For engineers reviewing the STM8L151C3T6 datasheet, STM8L151C3T6 pinout, STM8L151C3T6 application, or STM8L151C3T6 equivalent, this MCU delivers verified low-power run/wake timing (5 µs Halt wakeup), BCD calendar RTC with ±0.5 ppm digital calibration, and capacitive touch support across up to 20 channels-critical for energy-constrained embedded designs.

Technical Context

The STM8L151C3T6 implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz max frequency and supporting up to 40 external interrupt sources. Its clock system integrates dual oscillators (32 kHz LSE + 1–16 MHz HSE), factory-trimmed 16 MHz HSI, and 38 kHz LSI-all managed by a clock security system.

Power management includes five configurable low-power modes (Wait, Low-power Run, Low-power Wait, Active-halt with RTC, Halt), programmable voltage detector (PVD), and BOR with five selectable thresholds. The RTC operates independently in Active-halt mode with auto-wakeup capability and digital calibration accuracy of ±0.5 ppm.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad; 48-pin quad flat configuration optimized for compact PCB layout and thermal dissipation in space-constrained applications.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L051F3P6, the STM8L151C3T6 adds RTC, EEPROM, and capacitive touch-essential for time-stamped logging and human interface. Versus STM32L011D4P6, it offers lower active-mode power and simpler development for deterministic 8-bit control, though with less processing headroom.

Availability

STM8L151C3T6 is available at Aetrix Electronics and suitable for smart utility metering, wearable health monitors, industrial sensor nodes, and asset tracking beacons requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.

Supply support for STM8L151C3T6 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, specializing in microcontrollers, power management, sensors, and automotive ICs with strong focus on energy efficiency and industrial reliability.

The STM8L ultra-low-power MCU product line targets battery-operated and energy-harvesting applications where extended operational lifetime, precise real-time operation, and robust analog integration are critical design requirements.

FAQ

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

The STM8L151C3T6 achieves a maximum CPU frequency of 16 MHz using the internal 16 MHz HSI oscillator or external HSE crystal. At 3.0 V and 16 MHz, typical active-mode current consumption is 190 µA/MHz, resulting in ~3.04 mA total IDD(RUN). This value scales linearly with voltage and clock speed, and is confirmed in Table 19 of DS7204 Rev 11.

Does the device support hardware-accelerated capacitive touch sensing without external components?

Yes-the STM8L151C3T6 integrates a dedicated capacitive sensing controller supporting up to 20 channels with built-in charge-transfer measurement, baseline tracking, and noise filtering. It requires only external electrodes and no external ICs or RC networks, enabling touchkey, proximity, linear, and rotary implementations per Section 3.11 of the datasheet.

How is RTC accuracy maintained during battery voltage variation?

The RTC uses the 32.768 kHz LSE crystal oscillator with digital calibration achieving ±0.5 ppm accuracy over temperature. Its independent power domain (VDDA and VBAT pins) isolates it from main supply fluctuations, and the LSE security system detects oscillator failure and triggers interrupts-ensuring timekeeping integrity even during brown-out conditions.

Can the 256-byte data EEPROM be used for firmware parameter storage with wear-leveling?

The 256-byte data EEPROM supports up to 300,000 write/erase cycles and includes ECC for bit-error correction. While the device does not include built-in wear-leveling firmware, ST provides AN4821 application note with recommended software algorithms to distribute writes across EEPROM pages and extend endurance beyond 1 million effective cycles for parameter storage.