STMicroelectronics STM8L151G6U3

Overview

STM8L151G6U3 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, two ultra-low-power comparators, RTC with BCD calendar and auto-wakeup, and capacitive touch sensing (up to 16 channels). It operates from 1.65 V to 3.6 V across –40 °C to 125 °C and targets battery-powered industrial sensors and portable medical devices.

For engineers reviewing the STM8L151G6U3 datasheet, STM8L151G6U3 pinout, STM8L151G6U3 application, or STM8L151G6U3 equivalent, key selection criteria include active-halt current (1.3 µA with full RTC), Halt mode leakage (350 nA), fast wakeup time (4.7 µs), 41 mappable I/Os, and SWIM-based non-intrusive debugging support.

Technical Context

The STM8L151G6U3 implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. It integrates dual clock domains: high-speed (1–16 MHz HSE or 16 MHz factory-trimmed RC) and low-speed (32 kHz LSE or 38 kHz low-consumption RC), managed by a clock security system.

Its power architecture supports five distinct low-power modes-Wait, Low Power Run (5.1 µA), Low Power Wait (3 µA), Active-Halt (1.3 µA with RTC), and Halt (350 nA)-with per-pin leakage as low as 50 nA and guaranteed 4.7 µs wake-up from Halt mode.

Key Specifications

Pinout & Package

STM8L151G6U3 is housed in a 28-pin UFQFPN (4 × 4 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 STM8L152K4T6, STM8L151G6U3 removes LCD circuitry to reduce leakage and cost; versus STM32L051K8U6, it trades 32-bit flexibility for lower gate count, simpler peripheral mapping, and faster interrupt latency in deterministic sensor polling loops.

Availability

STM8L151G6U3 is available at Aetrix Electronics and suitable for industrial sensor nodes, portable medical monitors, smart utility meters, and asset tracking beacons requiring stable component supply over extended product lifecycles.

Supply support for STM8L151G6U3 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-powered instrumentation, wearable health devices, and smart infrastructure sensors-prioritizing nanowatt operation without sacrificing peripheral richness or development simplicity.

FAQ

What is the minimum operating voltage for STM8L151G6U3 in Halt mode?

The STM8L151G6U3 supports Halt mode operation down to 1.65 V, maintaining full memory retention and RTC functionality. At 1.65 V and 25 °C, typical Halt current is 350 nA; datasheet Table 26 confirms operation across the full 1.65–3.6 V range with specified timing and leakage behavior.

Does STM8L151G6U3 support hardware-accelerated AES encryption?

No. The STM8L151G6U3 does not include hardware cryptographic accelerators. It relies on software-based implementations for security functions. For AES support, ST recommends the STM32L4 or STM32U5 series, which integrate dedicated crypto processors and true random number generators.

Can the 12-bit DAC output drive a 1 kΩ load directly?

Yes-the integrated DAC includes a rail-to-rail output buffer capable of sourcing/sinking ±5 mA, enabling direct drive of 1 kΩ loads with <1 LSB INL error. Datasheet Table 50 specifies output impedance <1 Ω and settling time <10 µs for full-scale steps under these conditions.

How many I/O pins support capacitive touch sensing on STM8L151G6U3?

The STM8L151G6U3 supports up to 16 capacitive sensing channels across its GPIO ports (PA–PD). These are implemented in hardware via the TS (Touch Sensing) controller, requiring no CPU intervention during acquisition and supporting touchkey, proximity, linear, and rotary configurations per AN4649 application note.