STMicroelectronics STM8AL3166TAY

Overview

STM8AL3166TAY from STMicroelectronics is an AEC-Q100 qualified automotive-grade 8-bit ultra-low-power MCU featuring 32 Kbyte Flash, 2 Kbyte RAM, 1 Kbyte data EEPROM, 12-bit ADC (25 channels, up to 1 Mbps), 12-bit DAC with output buffer, two ultra-low-power comparators, RTC with BCD calendar and auto-wakeup (0.95 ppm resolution), and LCD controller supporting up to 4×28 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 modules.

For engineers reviewing the STM8AL3166TAY datasheet, STM8AL3166TAY pinout, STM8AL3166TAY application, or STM8AL3166TAY equivalent, key selection criteria include its five low-power modes (down to 400 nA in Halt with PDR), SWIM-based non-intrusive debugging, ISO 7816/IR/LIN-capable USART, and 41 mappable I/Os with interrupt capability-critical for space-constrained, safety-aware automotive microcontroller designs.

Technical Context

The STM8AL3166TAY implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz max frequency and supporting up to 40 external interrupt sources. 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 programmable voltage detector (PVD), five selectable BOR thresholds, and ultra-low leakage I/Os (50 nA). The RTC operates independently in active-halt mode (1.3 μA) with periodic wakeup, while the LCD controller includes integrated step-up converter-enabling direct drive of segmented displays without external bias circuitry.

Key Specifications

Pinout & Package

LQFP32 package (7 × 7 mm, 0.8 mm pitch), RoHS-compliant, ECOPACK2 certified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8L152R8T6, the STM8AL3166TAY adds LCD driving, extended temperature range, and LIN/ISO 7816 support-making it uniquely fit for display-integrated automotive body controllers. Against RL78/F13, it trades raw performance for lower static power and tighter integration of analog peripherals in a smaller footprint.

Availability

STM8AL3166TAY is available at Aetrix Electronics and suitable for automotive body electronics, battery-powered sensor modules, and instrument cluster display subsystems requiring stable component supply across extended temperature and long lifecycle demands.

Supply support for STM8AL3166TAY 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 automotive-grade components since 1987.

The STM8AL3x series is part of ST's automotive ultra-low-power MCU product line, engineered specifically for battery-sensitive, safety-conscious applications including door modules, TPMS, and segment LCD instrumentation-emphasizing AEC-Q100 compliance, sub-μA power states, and integrated analog peripherals.

FAQ

Is STM8AL3166TAY pin-compatible with other STM8AL31xx variants?

Yes-STM8AL3166TAY uses the LQFP32 package (7×7 mm) shared with STM8AL3136 and STM8AL3146. Pin functions are identical across the same package variant; however, feature enablement (e.g., LCD segment drivers) depends on specific part number and option byte configuration-not physical pinout.

What debug interface does STM8AL3166TAY support?

It supports SWIM (Single-Wire Interface Module), a proprietary ST protocol using one dedicated pin (SWIM) for non-intrusive debugging, flash programming, and real-time variable inspection. No JTAG or SWD hardware is required, reducing debug connector footprint and cost.

Does STM8AL3166TAY include hardware CRC calculation?

No-the STM8AL3166TAY does not integrate a dedicated CRC peripheral. CRC computation must be implemented in firmware using standard polynomial algorithms; the device provides no hardware acceleration or dedicated register set for CRC generation or verification.

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

Yes-the DAC features an integrated rail-to-rail output buffer capable of sourcing/sinking ±5 mA, allowing direct connection to low-impedance loads like LED drivers or op-amp inputs without external buffering. Output is available on PB4, PB5, and PB6 pins per datasheet Table 55.