STMicroelectronics STM8L151C8T3

Overview

STM8L151C8T3 from STMicroelectronics is an 8-bit ultra-low-power microcontroller featuring 64 KB Flash, 2 KB data EEPROM, RTC, LCD controller, 12-bit ADC (1 Msps, 28 channels), dual 12-bit DACs, and three USARTs. It operates from 1.65–3.6 V across –40 to +85 °C and targets battery-powered metering, portable medical devices, and smart sensors requiring sub-µA sleep current and fast wake-up.

For engineers reviewing the STM8L151C8T3 datasheet, STM8L151C8T3 pinout, STM8L151C8T3 application, or STM8L151C8T3 equivalent, key selection criteria include active-halt mode current (1.4 µA with full RTC), 48-pin LQFP package compatibility, 16 MHz max CPU frequency, and integrated capacitive touch sensing support for human-interface designs.

Technical Context

The STM8L151C8T3 implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. Its clock system integrates factory-trimmed 16 MHz RC, 38 kHz low-consumption RC, and external 32 kHz/1–16 MHz crystal oscillators with clock security monitoring.

Power management includes five programmable low-power modes-Halt (400 nA), Active-halt (1.4 µA with RTC), Low-power wait (3 µA), Low-power run (5.9 µA), and Wait-with fast 4.7 µs wake-up from Halt. The BOR supports five voltage thresholds, and I/O leakage is limited to 50 nA per pin.

Key Specifications

Pinout & Package

LQFP48 (7 × 7 mm, 0.5 mm pitch) package with 44 general-purpose I/Os, all mappable to interrupt vectors. Includes dedicated pins for RTC oscillator (OSC32_IN/OSC32_OUT), HSE (OSC_IN/OSC_OUT), SWIM debug interface (PA1), and LCD segment/common drivers (not used in STM8L151C8 variant).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L052C6T6, the STM8L151C8T3 adds RTC, dual DACs, and 2 KB EEPROM-critical for time-stamped data loggers. Versus EFM8LB12F64E, it offers superior ultra-low-power operation but less RAM and no native USB PHY.

Availability

STM8L151C8T3 is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, and industrial wireless sensor nodes requiring stable component supply, long-life battery operation, and certified low-power performance.

Supply support for STM8L151C8T3 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 ICs, sensors, and automotive semiconductors.

The STM8L ultra-low-power 8-bit MCU family targets energy-constrained applications such as battery-operated meters, wearables, and IoT edge nodes where sub-microamp sleep current and integrated analog peripherals reduce system complexity.

FAQ

What is the maximum operating temperature range for the STM8L151C8T3?

The STM8L151C8T3 is rated for operation from –40 °C to +85 °C. This industrial temperature grade is validated per ST's DS6948 Rev 11 specification and applies across the full 1.65–3.6 V supply range. No derating is required within this range for standard PCB layouts with adequate copper pour.

Does the STM8L151C8T3 support hardware-accelerated capacitive touch sensing?

Yes-it integrates a dedicated capacitive sensing controller supporting up to 16 channels in self- or mutual-capacitance mode. It includes built-in charge transfer, digital filtering, and baseline tracking, enabling robust touchkey, slider, and proximity detection without external components or CPU overhead.

Can the STM8L151C8T3 drive an LCD directly without external bias circuitry?

No-the STM8L151C8T3 does not include an LCD controller or step-up converter. Unlike the STM8L152 or STM8L162 variants, the 'C8' part number omits LCD peripheral blocks entirely, as confirmed in Table 1 and Figure 5 of DS6948 Rev 11.

Is SWIM debug supported on the STM8L151C8T3, and what pin is required?

Yes-SWIM (Single-Wire Interface for Microcontroller) debug is fully supported using PA1 (pin 11 in LQFP48). This enables programming, breakpoint setting, and register inspection without dedicated debug headers or additional pins, reducing PCB footprint and BOM count.