STMicroelectronics STM8L151C6U3

Overview

STM8L151C6U3 from STMicroelectronics is an 8-bit ultra-low-power microcontroller featuring 32 KB Flash, 1 KB data EEPROM with ECC, 2 KB RAM, 12-bit ADC (1 Msps, 25 channels), 12-bit DAC, RTC with BCD calendar and alarm, and up to 41 I/Os. It operates from 1.65 V to 3.6 V across –40 °C to +85 °C and targets battery-powered sensor nodes, portable medical devices, and smart utility meters requiring sub-µA halt-mode operation.

For engineers reviewing the STM8L151C6U3 datasheet, STM8L151C6U3 pinout, STM8L151C6U3 application, or STM8L151C6U3 equivalent, key selection criteria include verified 350 nA Halt-mode current, 4.7 µs wakeup latency, 16-channel capacitive sensing support, and dual ultra-low-power comparators with rail-to-rail capability - all validated for industrial-grade reliability in constrained-energy systems.

Technical Context

The STM8L151C6U3 implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. Its clock system integrates four oscillators: 1–16 MHz HSE, 32 kHz LSE, 16 MHz factory-trimmed HSI, and 38 kHz LSI - all managed by a clock security system to prevent run-time failure.

Power management includes five low-power modes (Wait, Low Power Run, Low Power Wait, Active-Halt with RTC, Halt), with consumption as low as 350 nA in Halt and 1.3 µA in Active-Halt with full RTC operation. The device supports memory-mapped peripherals via DMA (4 channels) and features RWW (Read-While-Write) Flash with flexible write protection.

Key Specifications

Pinout & Package

STM8L151C6U3 is housed in a 48-pin UFQFPN (7 × 7 mm, 0.5 mm pitch) package with exposed thermal pad. Pin functions are fully mappable to interrupt vectors, supporting flexible PCB layout and signal routing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L152C6U3, the STM8L151C6U3 removes LCD circuitry to reduce cost and static power, while retaining identical low-power performance and analog peripherals. Against STM32L051C8U3, it trades 32-bit compute scalability for tighter integration of DAC, beeper, and capacitive sensing - optimizing for minimal BOM count in simple sensor endpoints.

Availability

STM8L151C6U3 is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, and industrial sensor nodes requiring stable component supply across extended product lifecycles.

Supply support for STM8L151C6U3 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 analog products for industrial, automotive, and consumer markets.

The STM8L ultra-low-power MCU family targets energy-constrained applications such as battery-operated sensors, wearables, and smart meters - emphasizing sub-µA sleep modes, fast wake-up, and integrated analog peripherals to minimize external component count.

FAQ

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

The STM8L151C6U3 achieves a maximum CPU frequency of 16 MHz. At this speed and VDD = 3.3 V, typical active current is 195 µA/MHz + 440 µA - totaling approximately 3.56 mA. This value includes core, peripheral, and I/O supply currents under full load conditions per datasheet Table 20.

Does STM8L151C6U3 support hardware-accelerated cryptographic functions?

No. The STM8L151C6U3 does not include dedicated cryptographic accelerators (e.g., AES, SHA, or PKA). Security relies on software-implemented algorithms and its 96-bit unique ID for device identification. For hardware crypto, consider ST's STM32L4 or STM32U5 series MCUs.

Can the 12-bit DAC output drive a load directly, and what is its output impedance?

Yes - the integrated 12-bit DAC includes an output buffer enabling direct connection to loads up to 50 kΩ. Per datasheet Table 50, output impedance is <100 Ω, and full-scale output swing is 0 V to VDD with linearity error ≤ ±1 LSB across temperature and supply ranges.

Is SWIM debugging supported over standard UART pins, or does it require a dedicated interface?

SWIM (Single-Wire Interface for Microcontroller) requires the dedicated SWIM pin (Pin 12 in UFQFPN48), not shared with UART. It uses a proprietary protocol over a single bidirectional wire for programming and non-intrusive debugging - eliminating need for multi-pin debug headers while preserving all GPIOs for application use.