STMicroelectronics STM8AL3189TCX

Overview

STM8AL3189TCX from STMicroelectronics is an AEC-Q100 Grade 1 qualified automotive 8-bit ultra-low-power MCU featuring 64 Kbytes Flash, 4 Kbytes RAM, RTC with ±0.5 ppm accuracy, 12-bit ADC (1 Msps, 28 channels), dual 12-bit DACs, two ultra-low-power comparators, and LCD controller supporting 8×40 segments. It operates from 1.65 V to 3.6 V across –40 °C to 125 °C and targets battery-powered automotive body electronics such as smart sensors and dashboard displays.

For engineers reviewing the STM8AL3189TCX datasheet, STM8AL3189TCX pinout, STM8AL3189TCX application, or STM8AL3189TCX equivalent, key selection considerations include low-power mode current (1.4 µA in Active-halt with RTC), 67 GPIOs mappable to interrupt vectors, SWIM-based non-intrusive debugging, and LQFP64 package compatibility with automotive thermal and EMC requirements.

Technical Context

The STM8AL3189TCX implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. It integrates a clock security system, three crystal oscillator options (32 kHz LSE, 1–16 MHz HSE, and factory-trimmed 16 MHz/38 kHz RC), and programmable voltage detector with five BOR thresholds.

Its low-power architecture supports five distinct modes: Wait (full-speed operation), Low-power run (5.9 µA), Low-power wait (3 µA), Active-halt with RTC (1.4 µA), and Halt (400 nA), with wake-up from Halt in 4.7 µs. The RTC includes BCD calendar, alarm interrupt, digital calibration, and anti-tamper detection.

Key Specifications

Pinout & Package

LQFP64 package, 10 × 10 mm, 0.5 mm pitch, thermally enhanced for automotive under-hood use. Pin count and function mapping validated per ST's Figure 5 (STM8AL3189 64-pin pinout, no LCD).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive microcontroller applications.

Compared with STM8AL3L89TCX, the STM8AL3189TCX removes LCD hardware to reduce cost and power in non-display applications; versus RL78/F14, it delivers tighter RTC accuracy, broader supply range, and lower deep-sleep current - critical for always-on automotive subsystems.

Availability

STM8AL3189TCX is available at Aetrix Electronics and suitable for automotive body electronics, battery-powered sensor nodes, and dashboard display interfaces requiring stable component supply across extended temperature and lifetime requirements.

Supply support for STM8AL3189TCX 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 components since 1987.

The STM8AL ultra-low-power 8-bit MCU family targets automotive body electronics and battery-sensitive applications, emphasizing AEC-Q100 reliability, sub-µA sleep modes, and integrated analog peripherals to minimize external component count.

FAQ

What is the maximum operating frequency and core architecture of the STM8AL3189TCX?

The STM8AL3189TCX features an STM8 8-bit Harvard-architecture core with a 3-stage pipeline, achieving a maximum operating frequency of 16 MHz and a peak performance of 16 CISC MIPS. Its architecture supports deterministic interrupt latency and efficient code density, optimized for real-time automotive control tasks without floating-point requirements.

Does the STM8AL3189TCX support LIN communication, and which peripherals enable it?

Yes, the STM8AL3189TCX supports LIN 1.3 and LIN 2.0 protocols via its three USARTs, each configurable for LIN master/slave operation with automatic sync-break detection and checksum handling. Hardware LIN support eliminates software bit-banging overhead and ensures timing compliance across temperature and voltage ranges.

How does the RTC achieve ±0.5 ppm accuracy, and is calibration required in-system?

The RTC achieves ±0.5 ppm accuracy through digital calibration of the 32.768 kHz LSE oscillator using internal trimming registers, with compensation applied automatically by firmware. No external calibration equipment is required; the calibration value is stored in option bytes and persists across power cycles, enabling long-term calendar stability without host intervention.

What packaging and thermal specifications apply to the STM8AL3189TCX?

The STM8AL3189TCX is supplied in an LQFP64 package (10 × 10 mm, 0.5 mm pitch) with JEDEC-standard thermal characteristics: θ_JA = 40 °C/W (on 4-layer board), rated for operation from –40 °C to +125 °C ambient. Its exposed pad variant is not offered; thermal design relies on standard PCB copper pour and via stitching per ST AN4234 guidelines.