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STMicroelectronics STM8AL318ATCX

Name: STM8AL318ATCX
Brand: STMicroelectronics
SKU: STM8AL318ATCX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STM8AL318ATCX

Manufacturer:: STMicroelectronics

Category:: Microcontrollers

Package:: 80-LQFP

Datasheet:: STM8AL318ATCX.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STM8AL318ATCX 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), and two ultra-low-power comparators. It operates from 1.8 V to 3.6 V across –40 °C to 125 °C and targets battery-powered automotive body electronics requiring long-term low-power operation.

For engineers reviewing the STM8AL318ATCX datasheet, STM8AL318ATCX pinout, STM8AL318ATCX application, or STM8AL318ATCX equivalent, key selection considerations include its 400 nA Halt mode current, 4.7 µs wake-up time, 96-bit unique ID, SWIM debug interface, and support for LIN 2.0/USART-based diagnostics in constrained automotive environments.

Technical Context

The STM8AL318ATCX implements a Harvard-architecture STM8 core with 3-stage pipeline, delivering 16 CISC MIPS at 16 MHz. Its clock system integrates dual crystal oscillators (32 kHz LSE + 1–16 MHz HSE), factory-trimmed 16 MHz HSI RC, and 38 kHz LSI RC - all managed by a clock security system with failover detection.

Power management includes five programmable low-power modes: Wait (5.9 µA), Low-power Wait (3 µA), Active-Halt with full RTC (1.4 µA), and Halt (400 nA). The BOR reset supports five user-selectable thresholds, and I/O leakage is limited to 50 nA per pin - critical for always-on automotive nodes.

Key Specifications

Parameter	Value and Actual Design Meaning
Core Architecture	STM8 8-bit Harvard core with 3-stage pipeline; enables deterministic real-time execution at 16 MHz.
Flash / EEPROM	64 Kbytes Flash with ECC and RWW; 2 Kbytes data EEPROM with ECC - supports safe over-the-air firmware updates and parameter storage.
RTC Accuracy	±0.5 ppm digital calibration (BCD calendar); eliminates external temperature compensation in precision timing applications.
Halt Mode Current	400 nA at VDD = 1.65–3.6 V; enables multi-year battery life in always-on vehicle access modules.
ADC Performance	12-bit, 1 Msps, 28-channel with internal reference and temperature sensor - suitable for multi-sensor cabin monitoring without external references.
DAC Output	Dual 12-bit buffered DACs (PB4/PB5/PB6); provides precise analog actuator control (e.g., mirror positioning, HVAC valve drive).
Operating Temp	–40 °C to +125 °C; certified for under-hood and passenger compartment deployment per AEC-Q100 Grade 1.

Pinout & Package

LQFP80 package (14 × 14 mm, 0.5 mm pitch) with 67 GPIOs - all mappable to interrupt vectors. Pin functions validated per STM8AL318A 80-pin pinout diagram (Figure 3, DocID027179 Rev 7).

Pin/Terminal	Circuit Role	Design Meaning
VDD/VSS	Power supply / Ground	Dedicated power/ground pairs per quadrant minimize noise coupling in mixed-signal operation.
NRST	Active-low reset input	Supports external reset with programmable BOR threshold; compatible with automotive watchdog supervision chains.
SWIM	Single-wire interface for debug	Enables non-intrusive in-circuit programming and real-time debugging using only one pin.
PA0–PA7, PB0–PB7, etc.	General-purpose I/O	All 67 pins support interrupt generation, high-sink LED drive (PA0), and configurable pull-up/down - simplifies wiring in space-constrained modules.
OSC_IN/OSC_OUT	HSE crystal oscillator terminals	Supports 1–16 MHz external crystal; used for precise clocking of USARTs, LIN, and RTC when highest accuracy required.

Key Features

Feature	Design Value
Ultra-low-power RTC	BCD calendar with alarm, tamper detection, and ±0.5 ppm calibration - enables secure, accurate timekeeping without external components.
Low-power comparators	Two rail-to-rail comparators: one with fixed threshold, one with programmable hysteresis; both support wake-up from Halt mode.
LCD controller	Drives up to 8×40 segments with integrated step-up converter - eliminates external bias supply in instrument cluster or center-stack displays.
Motor control timer	TIM1 advanced control timer with 3 complementary PWM outputs and dead-time insertion - supports BLDC commutation in small actuators.
Communication suite	Three USARTs (LIN 1.3/2.0, IrDA), two SPIs, Fast I²C (400 kHz), and SMBus/PMBus - meets automotive sub-system interconnect requirements.

Applications

Automotive Door Module

Smart Rearview Mirror

Use Scenario: Centralized control of window lift, lock actuation, and anti-pinch sensing in OEM door modules.

IC Role / Device Role / Timing Role: Main MCU executing LIN slave protocol, sampling Hall sensors and driving motor drivers via TIM1 PWM.

Use Value: 400 nA Halt mode extends battery backup runtime during vehicle sleep; dual DACs generate precise reference voltages for analog sensor conditioning.

Use Scenario: Auto-dimming, glare detection, and electrochromic mirror control with ambient light and rear-light sensing.

IC Role / Device Role / Timing Role: Sensor fusion hub processing photodiode inputs via ADC, controlling mirror voltage via DAC, and communicating status over LIN.

Use Value: Integrated 12-bit ADC with internal reference eliminates external voltage reference IC; RTC enables timestamped event logging for diagnostic traceability.

Vehicle Access Control Unit

Cabin Temperature Sensor Node

Use Scenario: Keyless entry receiver with RF wake-up, button debouncing, and immobilizer handshake logic.

IC Role / Device Role / Timing Role: Ultra-low-power wake-up controller using comparator-triggered interrupt and fast 4.7 µs wake-up from Halt mode.

Use Value: 50 nA I/O leakage ensures minimal quiescent drain on 12 V backup battery; 96-bit unique ID enables secure cryptographic key binding.

Use Scenario: Distributed NTC thermistor monitoring across HVAC ducts with local signal conditioning and LIN reporting.

IC Role / Device Role / Timing Role: Analog front-end MCU digitizing temperature sensor outputs, compensating via internal temp sensor, and transmitting calibrated values.

Use Value: On-chip temperature sensor and 12-bit ADC with ±1.5 LSB INL enable <±0.5 °C measurement accuracy without calibration hardware.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
STM8AL3L8ATCX	Includes integrated LCD driver supporting 4×44 segments; identical core, memory, and low-power specs.	Required for designs with segmented LCD display (e.g., dashboard indicators); not pin-compatible due to LCD pin allocation.	Select when LCD interface is mandatory; otherwise STM8AL318ATCX offers lower cost and same peripheral set for non-LCD use cases.
RL78/F13-GB	Renesas RL78 core (16-bit), 64 KB Flash, 1.6–5.5 V operation, 250 nA STOP mode; lacks integrated RTC calibration and LIN 2.0 stack support.	Suitable for non-LIN automotive sensors where 16-bit math performance is prioritized over LIN compliance.	Prefer STM8AL318ATCX for LIN 2.0-compliant body networks; RL78/F13-GB better fits standalone sensor nodes needing higher CPU throughput.

Compared with STM8AL3L8ATCX, the STM8AL318ATCX removes LCD pins to increase GPIO count and reduce cost in non-display applications; versus RL78/F13-GB, it delivers superior LIN protocol integration, tighter RTC accuracy, and lower system BOM cost for entry-level automotive control units.

Availability

STM8AL318ATCX is available at Aetrix Electronics and suitable for automotive body control modules, smart mirror systems, and vehicle access units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for STM8AL318ATCX 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 STM8AL ultra-low-power 8-bit MCU family targets cost-sensitive automotive body electronics where extended battery life, AEC-Q100 compliance, and integrated analog peripherals reduce system complexity and bill-of-materials cost.

FAQ

What is the maximum operating frequency and core architecture of the STM8AL318ATCX?

The STM8AL318ATCX features an STM8 8-bit Harvard architecture core with a 3-stage pipeline, achieving a maximum operating frequency of 16 MHz and peak performance of 16 CISC MIPS. It uses a dedicated program and data bus to enable simultaneous instruction fetch and data access, improving real-time determinism in automotive control loops.

Does the STM8AL318ATCX support LIN 2.0 communication, and how is it implemented?

Yes, the STM8AL318ATCX supports LIN 2.0 via its three USART peripherals, each capable of generating and decoding LIN break fields, sync fields, and checksums in hardware. The USARTs include automatic baud rate detection and LIN-specific error handling, enabling compliant slave node implementation without external transceivers beyond standard LIN PHY.

How does the RTC achieve ±0.5 ppm accuracy, and is external calibration required?

The RTC achieves ±0.5 ppm accuracy through digital calibration of the 32 kHz LSE oscillator using internal temperature-compensated trimming registers. This calibration is performed at factory test and stored in option bytes; no external components or runtime calibration routines are needed for specified temperature and voltage ranges.

What debug interface does the STM8AL318ATCX use, and what are its physical requirements?

The STM8AL318ATCX uses the SWIM (Single-Wire Interface for Microcontroller) debug interface, requiring only one dedicated pin (SWIM) plus VDD and VSS. It supports full-speed programming, real-time variable inspection, and non-intrusive breakpointing without halting peripheral operation - ideal for in-vehicle diagnostics and field firmware updates.

STM8AL318ATCX Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 80-LQFP

Series:: STM8A

Packaging:: Tube

Product Status:: Obsolete

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, 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:

STM8AL318ATCX FAQ

1.How can I place an order for STM8AL318ATCX through Aetrix?

Please submit a Request for Quotation (RFQ) for STM8AL318ATCX 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 STM8AL318ATCX reliable?

The price and inventory of STM8AL318ATCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AL318ATCX is usually 5 days.

3.What payment methods are accepted for STM8AL318ATCX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AL318ATCX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STM8AL318ATCX?

STM8AL318ATCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STM8AL318ATCX 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 STM8AL318ATCX?

For technical support, including STM8AL318ATCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AL318ATCX requirements.

6.How does Aetrix verify that STM8AL318ATCX is sourced from the original manufacturer or authorized distributors?

All STM8AL318ATCX 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 STM8AL318ATCX meets industry standards.

7.What is the process for return or replacement of STM8AL318ATCX?

All STM8AL318ATCX units undergo pre-shipment inspection (PSI). If there is an issue with STM8AL318ATCX, 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 STM8AL318ATCX part is unused and in its original packaging.

Return procedure for STM8AL318ATCX:

1.Submit a request within 90 days.

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

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