STMicroelectronics STM8L151C3T3

Overview

STM8L151C3T3 from STMicroelectronics is an 8-bit ultra-low-power microcontroller featuring 8 KB Flash, 256-byte data EEPROM with ECC, RTC with ±0.5 ppm digital calibration, 12-bit ADC (1 Msps, 28 channels), and dual ultra-low-power comparators. It operates from 1.65–3.6 V across –40 to +85 °C and supports five low-power modes including Active-halt with RTC, enabling battery-powered sensor nodes and portable medical devices.

For engineers reviewing the STM8L151C3T3 datasheet, STM8L151C3T3 pinout, STM8L151C3T3 application, or STM8L151C3T3 equivalent, key selection criteria include verified 5 µs Halt-mode wakeup time, 50 nA I/O leakage current, LQFP48 package compatibility, and integrated capacitive touch sensing for human-interface designs.

Technical Context

The STM8L151C3T3 implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. Its clock system integrates three oscillators: factory-trimmed 16 MHz RC, 38 kHz low-consumption RC, and external 32 kHz crystal - all managed by a clock security system that triggers reset on oscillator failure.

Power management includes five selectable BOR thresholds, programmable voltage detector (PVD), and ultra-low-power RTC with auto-wakeup capability. Memory subsystem comprises 8 KB Flash with flexible read/write protection, 1 KB RAM, and 256-byte data EEPROM with error-correcting code (ECC) for robust data retention in harsh environments.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch) package with 41 user-configurable I/Os, all mappable to interrupt vectors and supporting capacitive sensing. Pin functions validated per STMicroelectronics DS7204 Rev 11 Figure 3 and Table 4.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L151C3T3, STM8L152C3T3 adds security features without sacrificing power or footprint, while STM32L011K4T6 trades analog/touch integration for 32-bit compute headroom - making the STM8L151 optimal for cost-sensitive, ultra-low-power touch-enabled endpoints.

Availability

STM8L151C3T3 is available at Aetrix Electronics and suitable for smart utility metering, portable medical devices, industrial sensor nodes, and home automation controllers requiring stable component supply and long-term lifecycle assurance.

Supply support for STM8L151C3T3 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 products for industrial, automotive, and consumer markets.

The STM8L ultra-low-power MCU product line targets battery-operated and energy-harvesting applications demanding sub-µA sleep currents, fast wake-up, and integrated analog peripherals - optimized for longevity and minimal external component count.

FAQ

What is the maximum operating frequency and core architecture of the STM8L151C3T3?

The STM8L151C3T3 uses an 8-bit STM8 Harvard-architecture core with a 3-stage pipeline, achieving a maximum clock frequency of 16 MHz and a peak performance of 16 CISC MIPS. It does not support dynamic frequency scaling; the CPU runs at integer divisions of the selected clock source (HSI, HSE, or LSI).

Does the STM8L151C3T3 support capacitive touch sensing, and how many channels are available?

Yes, the STM8L151C3T3 integrates hardware-accelerated capacitive sensing supporting up to 20 channels. It natively handles touchkey, proximity, linear slider, and rotary wheel configurations without external components, using dedicated TSC (Touch Sensing Controller) peripheral and built-in charge-transfer measurement.

What are the low-power mode wakeup times, and which peripherals remain active in each mode?

Halt mode offers the fastest wakeup at 5 µs, retaining only RTC and backup registers. Active-halt maintains RTC and limited SRAM while consuming ~300 nA (typical, LSE clocked). In Low-power Run mode, the CPU runs at reduced frequency (≤4 MHz) with full peripheral access but lower current draw than full Run mode.

Is the STM8L151C3T3 pin-compatible with other members of the STM8L151x3 family?

Yes - the STM8L151C3T3 in LQFP48 is pin-compatible with other STM8L151x3 variants (e.g., STM8L151K3, STM8L151G3) sharing the same package. Differences lie in peripheral count (e.g., fewer timers or I/Os in smaller packages), not pin function mapping, enabling scalable design reuse across form factors.