STMicroelectronics STM8L151G6U6

Overview

STM8L151G6U6 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 85 °C and targets battery-powered metering, portable medical devices, and smart sensors.

For engineers reviewing the STM8L151G6U6 datasheet, STM8L151G6U6 pinout, STM8L151G6U6 application, or STM8L151G6U6 equivalent, key selection criteria include active-halt current (1.3 µA with full RTC), Halt-mode consumption (350 nA), fast wakeup time (4.7 µs), 41 GPIOs with interrupt mapping, and SWIM-based non-intrusive debugging support.

Technical Context

The STM8L151G6U6 implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. Its clock system integrates dual crystal oscillators (1–16 MHz HSE and 32 kHz LSE), factory-trimmed 16 MHz RC, and 38 kHz low-consumption RC with clock security system.

Power management includes five configurable low-power modes-Wait, Low Power Run (5.1 µA), Low Power Wait (3 µA), Active-Halt with RTC (1.3 µA), and Halt (350 nA)-with per-I/O leakage as low as 50 nA and 4.7 µs wake-up from Halt. The RTC supports BCD calendar, alarm interrupts, and periodic auto-wakeup.

Key Specifications

Pinout & Package

STM8L151G6U6 is housed in a 28-pin UFQFPN package (4 × 4 mm, 0.5 mm pitch) with exposed thermal pad. Pin functions are validated per ST's DS6372 Rev 17, Table 5 (Medium-density pin description) and Figure 5 (UFQFPN28 pinout).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L152G6U6, the STM8L151G6U6 saves cost and power where LCD is unused; versus STM32L051K8U6, it delivers lower-system-cost capacitive touch and beeper functionality without external components, at the expense of 32-bit compute scalability.

Availability

STM8L151G6U6 is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, and industrial wireless sensor nodes requiring stable component supply, long-term lifecycle assurance, and verified ultra-low-power performance.

Supply support for STM8L151G6U6 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-critical applications such as energy meters, wearables, and IoT endpoints, emphasizing sub-µA sleep modes, integrated peripherals, and robust development tooling including ST-LINK and STM8CubeMX.

FAQ

What is the minimum operating voltage for STM8L151G6U6 in Halt mode?

The STM8L151G6U6 supports operation down to 1.65 V in all low-power modes, including Halt. At this voltage, Halt-mode current remains at 350 nA with full SRAM retention and register state preservation - confirmed in DS6372 Rev 17, Table 26. Below 1.65 V, the device enters power-down and loses volatile memory contents.

Does STM8L151G6U6 support hardware-accelerated capacitive touch sensing?

Yes. The STM8L151G6U6 integrates a dedicated capacitive sensing controller supporting up to 16 channels with hardware-accelerated acquisition, automatic recalibration, and noise filtering. It supports touchkey, proximity, linear slider, and rotary encoder configurations without CPU intervention - detailed in Section 3.13 and Table 2 of DS6372 Rev 17.

Can the 12-bit DAC output drive external loads directly?

The integrated 12-bit DAC features an output buffer enabling direct drive of resistive loads up to 50 kΩ (per DS6372 Rev 17, Table 50). It supports three dedicated pins (PB4, PB5, PB6) and provides monotonic output with ±1 LSB INL/DNL. For capacitive or high-current loads, an external op-amp is recommended.

Is SWIM debugging supported on the UFQFPN28 package?

Yes. SWIM (Single-Wire Interface Module) debugging is fully supported on the STM8L151G6U6 in UFQFPN28 packaging via the dedicated SWIM pin (Pin 27, as defined in Figure 5 and Table 5 of DS6372 Rev 17). No additional pins or headers are required - enabling in-circuit programming and real-time debugging with ST-LINK/V2 or compatible tools.