STMicroelectronics STM8AL3148TAY

Overview

STM8AL3148TAY from STMicroelectronics is an AEC-Q100 qualified automotive 8-bit ultra-low-power MCU featuring 32 Kbyte Flash, 2 Kbyte RAM, 1 Kbyte data EEPROM, integrated RTC, LCD controller (4×28 segments), 12-bit ADC (25 channels, up to 1 Mbps), 12-bit DAC with output buffer, two ultra-low-power comparators, and multiple timers including an advanced control timer for motor control. It operates from 1.8 V to 3.6 V across –40 °C to 125 °C and targets battery-powered automotive body electronics.

For engineers reviewing the STM8AL3148TAY datasheet, STM8AL3148TAY pinout, STM8AL3148TAY application, or STM8AL3148TAY equivalent, key selection criteria include ultra-low-power operation (400 nA Halt mode), automotive qualification, integrated LCD driver, dual comparator wakeup capability, and SWIM-based non-intrusive debugging support.

Technical Context

The STM8AL3148TAY 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, 32 kHz LSE), factory-trimmed 16 MHz RC, and 38 kHz low-consumption RC with clock security system.

Power management includes five 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 with PDR (400 nA)-enabling sub-microamp operation while retaining RTC and memory retention. The RTC provides BCD calendar, alarm interrupt, and auto-wakeup with 0.95 ppm resolution.

Key Specifications

Pinout & Package

LQFP48 package (7 × 7 mm, 0.5 mm pitch), RoHS-compliant, ECOPACK2 certified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8AL3L48TAY, the STM8AL3148TAY omits LCD circuitry-reducing cost and power in non-display applications-while matching all other automotive-grade peripherals and ultra-low-power modes. Versus RL78/F14, it trades 16-bit throughput for superior sub-μA Halt efficiency and finer RTC timing resolution critical for battery-sensitive systems.

Availability

STM8AL3148TAY is available at Aetrix Electronics and suitable for automotive instrument clusters, body control modules, and HVAC control units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for STM8AL3148TAY 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 automotive-grade solutions.

The STM8AL3x series is part of ST's ultra-low-power automotive MCU portfolio, engineered specifically for battery-constrained, safety-critical body electronics where AEC-Q100 compliance, sub-microamp operation, and integrated analog peripherals are mandatory.

FAQ

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

The STM8AL3148TAY operates up to 16 MHz. At 16 MHz from Flash, typical current consumption is 195 μA/MHz + 440 μA, totaling ~3.56 mA at VDD = 3.0 V and 25 °C. This includes core, Flash, and peripheral power; actual consumption scales linearly with clock frequency and supply voltage.

Does STM8AL3148TAY support in-circuit debugging without halting real-time operation?

Yes. It features the SWIM (Single-Wire Interface Module) interface, enabling non-intrusive debugging: breakpoints, register inspection, and memory read/write occur without stopping the CPU or affecting timing-critical peripherals like timers or ADC conversions.

How does the RTC maintain accuracy during ultra-low-power Halt mode?

The RTC runs from the 32 kHz LSE crystal oscillator even in active-Halt mode (1.3 μA). Its auto-wakeup timer achieves 0.95 ppm resolution-equivalent to ±2.7 seconds per month-by leveraging the high-stability external crystal, not the internal RC oscillator.

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

Yes. The integrated 12-bit DAC includes an output buffer capable of sourcing/sinking ±5 mA, allowing direct connection to op-amp inputs, LED dimming circuits, or analog sensor biasing-no external buffer required for moderate-impedance loads.