STMicroelectronics STM8L151G4U6

Overview

STM8L151G4U6 from STMicroelectronics is an 8-bit ultra-low-power microcontroller featuring 16 MHz STM8 core, 16 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 up to 41 I/Os in a 28-pin UFQFPN package. It targets battery-powered sensor nodes, portable medical devices, and smart utility meters requiring sub-µA sleep current and fast wake-up.

For engineers reviewing the STM8L151G4U6 datasheet, STM8L151G4U6 pinout, STM8L151G4U6 application, or STM8L151G4U6 equivalent, key selection criteria include active-halt current (1.3 µA), Halt-mode wakeup time (4.7 µs), 1.65–3.6 V operating range, LCD support exclusion (G4 variant), and SWIM debug interface compatibility.

Technical Context

The STM8L151G4U6 implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. It integrates dual clock domains: high-speed (HSE/LSE/HSI) and low-speed (LSI/38 kHz RC), managed by a Clock Security System for fault detection.

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

Key Specifications

Pinout & Package

STM8L151G4U6 is housed in a 28-pin Ultra Thin Fine Pitch Quad Flat No-lead (UFQFPN28) package, 4 × 4 mm, 0.5 mm pitch, with exposed thermal pad. Pinout conforms to STM8L151Gx series layout (Figure 5, DS6372 Rev 17).

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L151K4T6, the G4U6 offers smaller size and lower assembly cost; versus STM32L011K4U6, it delivers superior µA/MHz efficiency and simpler toolchain for deterministic 8-bit control, making it optimal for deeply embedded, cost-sensitive, battery-constrained roles.

Availability

STM8L151G4U6 is available at Aetrix Electronics and suitable for smart utility metering, portable medical sensors, industrial sensor nodes, and asset tracking beacons requiring stable component supply across extended product lifecycles.

Supply support for STM8L151G4U6 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 components for industrial, automotive, and consumer markets.

The STM8L ultra-low-power MCU family targets battery-operated and energy-harvesting applications where sub-microamp sleep current, fast wake-up, and robust peripheral integration are critical design requirements.

FAQ

Does STM8L151G4U6 support LCD driving?

No. The STM8L151G4U6 belongs to the STM8L151xx "without LCD" series (per Table 1, DS6372). Only STM8L152xx variants integrate the LCD controller and step-up converter. This part omits LCD-related pins and registers, reducing die size and cost for non-display applications.

What debug interface does STM8L151G4U6 use?

It uses the Single-Wire Interface Module (SWIM), a proprietary ST protocol requiring only one dedicated pin (SWIM) and ground. SWIM supports full-speed on-chip programming, real-time variable inspection, and non-intrusive breakpoints without halting peripheral operation.

Is the 1.65 V minimum supply voltage supported across all operating temperatures?

Yes. The datasheet specifies 1.65–3.6 V operation over the full industrial temperature range (−40 °C to +85 °C), validated in Table 18 and Figure 24. At 1.65 V, maximum frequency is reduced to 8 MHz, and certain peripherals (e.g., ADC accuracy) have tightened specifications per Table 54–56.

How many capacitive sensing channels are available on this device?

The STM8L151G4U6 supports up to 16 hardware-accelerated capacitive sensing channels, mapped across GPIO ports PA–PD. These channels implement charge-transfer measurement with built-in scan sequencing, enabling touchkey, proximity, linear, and rotary touch interfaces without CPU intervention.