STMicroelectronics STM8AL3166TCY

Overview

STM8AL3166TCY 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, 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, and LCD controller supporting up to 4×28 segments. It operates from 1.8 V to 3.6 V across –40 °C to 125 °C and targets battery-powered automotive body electronics such as smart sensors and dashboard sub-modules.

For engineers reviewing the STM8AL3166TCY datasheet, STM8AL3166TCY pinout, STM8AL3166TCY application, or STM8AL3166TCY equivalent, key selection criteria include ultra-low-power run mode (5.1 μA), active-halt RTC operation (1.3 μA), 41 mappable I/Os with interrupt capability, dual watchdogs (window + independent), and LIN 2.0/USART support for vehicle network nodes.

Technical Context

The STM8AL3166TCY 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 five configurable 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). The RTC provides 0.95 ppm resolution and periodic wakeup, while the LCD controller includes integrated step-up converter for segment driving without external components.

Key Specifications

Pinout & Package

LQFP32 package (7 × 7 mm, 0.8 mm pitch) with 32 pins; RoHS-compliant, ECOPACK2 qualified.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8AL3168TCY, the STM8AL3166TCY trades minor bootloader flexibility for identical real-time performance and lower unit cost; versus RL78/F13, it delivers 3× lower active-halt current and integrated LCD drive-critical for compact, battery-sensitive automotive displays.

Availability

STM8AL3166TCY is available at Aetrix Electronics and suitable for automotive body electronics, battery monitoring systems, and instrument cluster sub-modules requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for STM8AL3166TCY 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, and automotive-grade silicon for industrial and transportation markets.

The STM8AL3x series targets automotive body electronics with ultra-low-power operation, AEC-Q100 qualification, and integrated peripherals-including LCD, RTC, and LIN-capable USART-to reduce system complexity and bill-of-materials cost.

FAQ

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

The STM8AL3166TCY achieves a maximum clock frequency of 16 MHz. At this speed, typical current consumption is 195 μA/MHz plus 440 μA when running from Flash memory. This equates to approximately 3.56 mA total at 16 MHz, verified under VDD = 3.3 V and TA = 25 °C per DS7106 Rev 9 Section 9.3.3.

Does STM8AL3166TCY support LIN 2.0 physical layer compliance?

Yes, the integrated USART supports LIN 2.0 protocol through hardware-level features including break detection, sync field handling, and checksum calculation. It meets ISO 17987-4 electrical specifications when paired with a compliant LIN transceiver such as the TLE7259-3GE.

How many I/O pins support external interrupt capability?

All 41 general-purpose I/Os on the STM8AL3166TCY can be individually configured to generate interrupts on rising/falling edges or level change. Each port pin maps to dedicated vector entries in the interrupt controller, enabling responsive event-driven operation without polling overhead.

Is the 12-bit DAC output buffered, and what is its voltage range?

Yes, the 12-bit DAC includes an integrated output buffer capable of rail-to-rail operation. Its output voltage range spans from VSS to VDD, supporting direct connection to actuators or op-amp inputs without external buffering, as confirmed in Section 3.10 and Table 53 of DS7106 Rev 9.