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STMicroelectronics STM8AL3L8ATCX

Name: STM8AL3L8ATCX
Brand: STMicroelectronics
SKU: STM8AL3L8ATCX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STM8AL3L8ATCX

Manufacturer:: STMicroelectronics

Category:: Microcontrollers

Package:: 80-LQFP

Datasheet:: STM8AL3L8ATCX.pdf

Description:: IC MCU 8BIT 64KB FLASH 80LQFP

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Product details

Overview

STM8AL3L8ATCX from STMicroelectronics is an AEC-Q100 Grade 1 qualified automotive 8-bit ultra-low-power microcontroller featuring 64 Kbytes Flash, 4 Kbytes RAM, RTC with ±0.5 ppm digital calibration, 12-bit ADC (1 Msps, 28 channels), dual 12-bit DACs, LCD controller (8×40/4×44), and two ultra-low-power comparators. It operates from 1.8–3.6 V across –40 to 125 °C and targets battery-powered automotive body electronics requiring long-term reliability and sub-µA sleep modes.

For engineers reviewing the STM8AL3L8ATCX datasheet, STM8AL3L8ATCX pinout, STM8AL3L8ATCX application, or STM8AL3L8ATCX equivalent, key selection criteria include its AEC-Q100 Grade 1 qualification, Active-halt mode current of 1.4 µA with full RTC operation, 40 external interrupt sources, SWIM-based non-intrusive debugging, and LCD driver integration for instrument cluster or HVAC display interfaces.

Technical Context

The STM8AL3L8ATCX implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. Its clock system integrates three oscillators: 32 kHz LSE, 1–16 MHz HSE, and factory-trimmed 16 MHz HSI with 38 kHz LSI - all managed by a clock security system that triggers reset on oscillator failure.

Power management includes five low-power modes with verified current values: Low-power run (5.9 µA), Low-power wait (3 µA), Active-halt (1.4 µA with RTC), and Halt (400 nA). The RTC supports BCD calendar, alarm interrupt, anti-tamper detection, and digital calibration - all functional in Active-halt mode without waking the CPU.

Key Specifications

Parameter	Value and Actual Design Meaning
Core Architecture	Harvard, 3-stage pipeline STM8 CPU; enables deterministic instruction timing and efficient code density for safety-critical automotive firmware.
Max Operating Frequency	16 MHz; delivers 16 CISC MIPS peak performance while maintaining <200 µA/MHz + 330 µA active current consumption.
Flash / EEPROM / RAM	64 Kbytes Flash with ECC and RWW, 2 Kbytes data EEPROM with ECC, 4 Kbytes RAM; supports field firmware updates and parameter storage with error correction.
ADC Resolution & Speed	12-bit SAR ADC, up to 1 Msps, 28 input channels including temp sensor and internal reference; enables high-accuracy sensor monitoring in engine control or cabin climate systems.
DAC Channels	Two independent 12-bit DACs with output buffers; supports analog actuator control (e.g., valve positioning) or precision reference generation.
Low-Power Halt Current	400 nA at VDD = 1.65–3.6 V; allows multi-year battery operation in always-on automotive modules like door handle sensors or tire pressure monitors.
LCD Driver	Integrated 8×40 or 4×44 segment driver with built-in step-up converter; eliminates external bias supply for automotive dashboard or center console displays.

Pinout & Package

LQFP80 package (14 × 14 mm, 0.5 mm pitch), RoHS-compliant, with 67 I/Os - all mappable to interrupt vectors and supporting ultra-low leakage (50 nA per I/O).

Pin/Terminal	Circuit Role	Design Meaning
VDD, VSS	Power supply and ground	Dual power domains: VDDA for analog peripherals (ADC/DAC/comp), VDD for digital core; ensures noise isolation in mixed-signal operation.
PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7, PE0–PE7, PF0–PF7, PG0–PG7, PH0–PH7	General-purpose I/O with interrupt capability	All 67 GPIOs support external interrupt, wake-up from all low-power modes, and configurable pull-up/pull-down; critical for switch matrix or sensor polling in body control units.
OSC_IN / OSC_OUT	HSE crystal oscillator interface	Supports 1–16 MHz external crystal; used for precise clock source in LIN/USART communication or RTC synchronization.
LSE_IN / LSE_OUT	LSE crystal oscillator interface	32.768 kHz external crystal input for RTC; enables ±0.5 ppm accuracy and tamper detection in security-critical timekeeping.
SWIM	Single-wire interface for debug and programming	Enables non-intrusive in-circuit debugging and fast on-chip programming without halting real-time operation - essential for production line firmware flashing.
VLCD	LCD voltage supply output	Internal step-up converter generates programmable VLCD (up to 5.5 V); eliminates need for external charge pump in automotive LCD applications.

Key Features

Feature	Design Value
AEC-Q100 Grade 1 qualification	Validated for automotive ambient temperatures up to +125 °C and robust ESD/EMC performance per ISO 11452 and ISO 10605 standards.
Ultra-low-power RTC with digital calibration	±0.5 ppm accuracy over temperature and voltage; maintains precise timekeeping in Active-halt mode with no CPU intervention or external components.
Flexible low-power mode sequencing	Five distinct modes (Wait, Low-power Run, Low-power Wait, Active-halt, Halt) with measured currents from 400 nA to 5.9 µA; enables granular energy budgeting in battery-supplied ECUs.
Integrated LCD controller with step-up	Drives up to 320 segments (8×40) using internal VLCD generator; reduces BOM count and PCB area in instrument clusters and HVAC panels.
Dual 12-bit DACs with buffer	Independent outputs on PB4/PB5/PB6; provides rail-to-rail analog signals for closed-loop control of actuators or sensor calibration references.

Applications

Automotive Instrument Cluster

Body Control Module (BCM)

Use Scenario: Driving analog gauges and segmented LCD displays in vehicle dashboards with minimal external components.

IC Role / Device Role / Timing Role: Primary MCU managing LCD segment drive, CAN/LIN communication, and real-time gauge animation via TIM1 advanced timer PWM outputs.

Use Value: Integrated VLCD step-up and 8×40 LCD controller eliminate external DC-DC converters, reducing cost and improving reliability in high-vibration environments.

Use Scenario: Centralized control of door locks, window lifts, mirror adjustment, and interior lighting in passenger vehicles.

IC Role / Device Role / Timing Role: System controller executing LIN 2.0 slave protocol, reading switch inputs, driving relays/LEDs, and logging fault events to EEPROM.

Use Value: 67 GPIOs with interrupt mapping and ultra-low leakage (50 nA/I/O) enable direct connection to dozens of switches/sensors without external signal conditioning.

Automotive HVAC Control Unit

Tire Pressure Monitoring System (TPMS) Receiver

Use Scenario: Regulating cabin temperature via stepper motor control, thermistor reading, and user interface feedback on segmented LCD.

IC Role / Device Role / Timing Role: Real-time thermal management unit using 12-bit ADC for NTC sensing, dual DACs for fan speed reference, and beeper timer for UI alerts.

Use Value: On-chip 12-bit ADC (1 Msps) and dual buffered DACs provide closed-loop precision without external signal chain components.

Use Scenario: Battery-powered receiver node decoding RF signals from TPMS sensors and reporting status via LIN bus.

IC Role / Device Role / Timing Role: Ultra-low-power wake-on-radio event controller using comparator wakeup and Halt mode (400 nA) between periodic sensor checks.

Use Value: 400 nA Halt current and 4.7 µs wake-up time extend coin-cell battery life beyond 10 years while maintaining responsive RF event detection.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STM8AL318ATCX	No integrated LCD controller; lacks VLCD step-up and segment drivers; otherwise identical Flash/RAM/peripherals.	Suitable for non-display automotive nodes (e.g., junction boxes, seat control) where LCD is unnecessary.	Select when display functionality is absent and BOM cost reduction is prioritized over LCD integration.
RL78/F13-GB	Renesas RL78 core (16-bit), 64 Kbytes Flash, 4 Kbytes RAM, but no integrated LCD driver or ±0.5 ppm RTC calibration.	Used in Japanese OEM BCMs; requires external LCD bias and higher software overhead for RTC compensation.	Choose only if existing RL78 toolchain and ecosystem alignment outweigh STM8AL3L8x's lower power and integrated display features.

Compared with STM8AL318ATCX, the STM8AL3L8ATCX adds LCD-specific pins and analog circuitry enabling direct segment drive - eliminating external components. Versus RL78/F13-GB, it offers superior RTC accuracy and lower deep-sleep current, making it preferable for long-life, display-integrated automotive modules.

Availability

STM8AL3L8ATCX is available at Aetrix Electronics and suitable for automotive instrument clusters, body control modules, HVAC controllers, and TPMS receivers requiring stable component supply across extended temperature ranges and AEC-Q100 compliance.

Supply support for STM8AL3L8ATCX 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 silicon for industrial and transportation markets.

The STM8AL ultra-low-power 8-bit MCU family targets automotive body electronics where extended battery life, AEC-Q100 reliability, and integrated analog peripherals (LCD, RTC, DAC, ADC) reduce system complexity and cost.

FAQ

What is the maximum operating temperature range for STM8AL3L8ATCX?

The STM8AL3L8ATCX is qualified for AEC-Q100 Grade 1, supporting continuous operation from –40 °C to +125 °C ambient temperature. This rating is validated per JEDEC JESD22-A108 and confirmed in the device's electrical characteristics tables (Section 9.3.1), making it suitable for under-hood and dashboard-mounted automotive applications.

Does STM8AL3L8ATCX support in-system programming via SWIM?

Yes - the STM8AL3L8ATCX supports non-intrusive in-circuit programming and debugging via the single-wire SWIM interface. It enables full Flash and EEPROM read/write operations, option byte configuration, and real-time variable inspection without halting program execution, as documented in Section 3.18 and RM0016 reference manual.

How many I/O pins support external interrupt capability?

All 67 general-purpose I/O pins on the STM8AL3L8ATCX support external interrupt generation and can wake the device from any low-power mode. Each port pin is individually mappable to one of 40 interrupt vectors, providing flexible event-driven architecture for switch scanning, sensor polling, or LIN bus edge detection.

Is the RTC functional in Halt mode?

No - the RTC remains active only in Active-halt mode (1.4 µA), where it runs from the LSE oscillator with full calendar, alarm, and tamper detection enabled. In true Halt mode (400 nA), the RTC is disabled to minimize current; wake-up requires external interrupt or reset, not RTC alarm.

STM8AL3L8ATCX Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 80-LQFP

Series:: STM8A

Packaging:: Tube

Product Status:: Not For New Designs

Programmable:: Not Verified

Core Processor:: STM8

Core Size:: 8-Bit

Speed:: 16MHz

Connectivity:: I2C, IrDA, LINbus, SPI, UART/USART

Peripherals:: Brown-out Detect/Reset, DMA, LCD, POR, PWM, WDT

Number of I/O:: 68

Program Memory Size:: 64KB (64K x 8)

Program Memory Type:: FLASH

EEPROM Size:: 2K x 8

RAM Size:: 4K x 8

Voltage - Supply (Vcc/Vdd):: 1.65V ~ 3.6V

Data Converters:: A/D 28x12b; D/A 2x12b

Oscillator Type:: Internal

Operating Temperature:: -40°C ~ 125°C (TA)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:

STM8AL3L8ATCX FAQ

1.How can I place an order for STM8AL3L8ATCX through Aetrix?

Please submit a Request for Quotation (RFQ) for STM8AL3L8ATCX on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for STM8AL3L8ATCX reliable?

The price and inventory of STM8AL3L8ATCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AL3L8ATCX is usually 5 days.

3.What payment methods are accepted for STM8AL3L8ATCX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AL3L8ATCX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STM8AL3L8ATCX?

STM8AL3L8ATCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STM8AL3L8ATCX order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for STM8AL3L8ATCX?

For technical support, including STM8AL3L8ATCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AL3L8ATCX requirements.

6.How does Aetrix verify that STM8AL3L8ATCX is sourced from the original manufacturer or authorized distributors?

All STM8AL3L8ATCX products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that STM8AL3L8ATCX meets industry standards.

7.What is the process for return or replacement of STM8AL3L8ATCX?

All STM8AL3L8ATCX units undergo pre-shipment inspection (PSI). If there is an issue with STM8AL3L8ATCX, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The STM8AL3L8ATCX part is unused and in its original packaging.

Return procedure for STM8AL3L8ATCX:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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