STMicroelectronics STM8L151C8U3

Overview

STM8L151C8U3 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 - deployed in battery-powered utility meters and portable medical sensors requiring sub-µA sleep current and fast wake-up.

For engineers reviewing the STM8L151C8U3 datasheet, STM8L151C8U3 pinout, STM8L151C8U3 application, or STM8L151C8U3 equivalent, this page delivers verified package mapping (UFQFPN48), confirmed low-power mode currents (400 nA Halt, 1.4 µA Active-halt), real-time clock calibration accuracy (±0.5 ppm), capacitive touch channel count (16), and UART/ISO 7816 interface support for secure peripheral integration.

Technical Context

The STM8L151C8U3 implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz while supporting five deterministic low-power modes - including Halt (400 nA) and Active-halt with full RTC (1.4 µA). Its clock system integrates factory-trimmed 16 MHz RC, 38 kHz low-consumption RC, and external 32 kHz crystal oscillator for precision timekeeping.

Peripheral integration includes two SPIs, Fast I²C (400 kHz), three USARTs with ISO 7816 and IrDA support, DMA with 4 channels for ADC/DAC/SPI/I²C/USART/timer transfers, and a dedicated beeper timer (1/2/4 kHz). The analog subsystem comprises two rail-to-rail ultra-low-power comparators, a temperature sensor, and internal reference voltage generator.

Key Specifications

Pinout & Package

STM8L151C8U3 is housed in a 48-pin UFQFPN (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are validated per ST's DS6948 Rev 11 Figure 7 and Table 5 (High-density and medium+ density STM8L15x pin description).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L152C8U3, the STM8L151C8U3 removes LCD hardware to reduce cost and leakage, while retaining identical low-power performance and analog features; versus STM32L053R8T6, it trades 32-bit flexibility for guaranteed sub-µA Halt mode and simpler toolchain for deterministic sensor-edge tasks.

Availability

STM8L151C8U3 is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, industrial sensor nodes, and secure access devices requiring stable component supply across extended product lifecycles.

Supply support for STM8L151C8U3 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 8-bit MCU family targets battery-critical applications such as energy metering, portable healthcare, and wireless sensor networks - prioritizing nanowatt sleep modes, integrated RTC accuracy, and hardware-accelerated touch over raw compute throughput.

FAQ

What is the minimum supply voltage for STM8L151C8U3 with BOR enabled?

The minimum operating supply voltage with Brown-out Reset (BOR) enabled is 1.8 V, as specified in Section 9.3.1 of DS6948 Rev 11. Below this threshold, the BOR circuit asserts reset to prevent erratic operation; disabling BOR permits operation down to 1.65 V but removes this safety mechanism.

Does STM8L151C8U3 support hardware AES encryption?

No, STM8L151C8U3 does not include hardware AES acceleration. It relies on software-based cryptographic libraries for encryption; for hardware-accelerated AES, ST's STM32L series (e.g., STM32L4x or STM32L5x) provides dedicated crypto processors with AES-128/256 engines and key management units.

Can the 12-bit DAC outputs drive a speaker directly?

The dual 12-bit DACs feature integrated output buffers rated for ±5 mA sink/source, sufficient for driving high-impedance headphones or piezo buzzers but not low-impedance speakers (typically <32 Ω). For speaker drive, an external Class-D or AB amplifier stage is required to deliver adequate current and voltage swing.

How many I/O pins support capacitive sensing on STM8L151C8U3?

STM8L151C8U3 supports up to 16 capacitive sensing channels using dedicated hardware (CSD), mapped across GPIO pins PA0–PA7, PB0–PB7, and PC0–PC1 as defined in Section 3.13 and Table 2 of DS6948 Rev 11 - enabling simultaneous touchkey, proximity, and slider implementations without CPU intervention.