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STMicroelectronics STM8AL318ATCY
- Part No.:
- STM8AL318ATCY
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 80-LQFP
- Datasheet:
-
STM8AL318ATCY.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 80LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:540
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Product details
Overview
STM8AL318ATCY 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, and LCD controller (8×40/4×44). It operates from 1.65–3.6 V across –40 to 125 °C and targets battery-powered automotive body electronics requiring long-term low-power operation.
For engineers reviewing the STM8AL318ATCY datasheet, STM8AL318ATCY pinout, STM8AL318ATCY application, or STM8AL318ATCY equivalent, key selection criteria 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, IrDA, and SMBus-compliant I²C in harsh automotive environments.
Technical Context
The STM8AL318ATCY 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 and 38 kHz LSI RC sources, and a clock security system with automatic failover.
Power management includes five configurable low-power modes-down to 400 nA in Halt-with programmable BOR thresholds, PVD, and ultra-low I/O leakage (50 nA per pin). The RTC operates independently in Active-halt mode (1.4 µA) with anti-tamper detection and BCD calendar/alarm functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8 8-bit Harvard, 3-stage pipeline, 16 MIPS @ 16 MHz - enables deterministic real-time control with minimal code footprint |
| Flash / EEPROM / RAM | 64 Kbytes Flash with RWW & ECC, 2 Kbytes data EEPROM, 4 Kbytes RAM - supports robust firmware updates and nonvolatile parameter storage |
| Low-Power Consumption | Halt mode: 400 nA; Active-halt (RTC active): 1.4 µA; Low-power run: 5.9 µA - extends battery life in always-on automotive modules |
| Analog Peripherals | 12-bit ADC (1 Msps, 28 ch, temp sensor, Vref); dual 12-bit DACs (buffered); 2 ultra-low-power comparators - enables precision sensing and analog actuation without external ICs |
| Communication Interfaces | 3× USART (LIN 2.0/IrDA), 2× SPI, I²C (400 kHz SMBus/PMBus), LCD controller (8×40) - supports multi-protocol body control and display subsystems |
| Operating Range | AEC-Q100 Grade 1 (–40 to 125 °C), 1.65–3.6 V supply - certified for under-hood and cabin applications with wide thermal/voltage margins |
| Debug & Security | SWIM single-wire interface, 96-bit unique ID, flexible read/write protection - enables secure in-system programming and traceable production |
Pinout & Package
LQFP80 package (14 × 14 mm, 0.5 mm pitch), RoHS-compliant, with 67 user-configurable I/Os - all mappable to interrupt vectors and supporting high-density automotive PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual power domains (VDDA/VDDD) enable analog/digital isolation; 67 I/Os tolerate 5 V on input (except JTAG/SWIM) |
| NRST | Active-low reset input | Supports external reset with internal pull-up; compatible with automotive watchdog systems |
| PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7, PE0–PE7, PF0–PF7, PG0–PG7, PH0–PH7 | General-purpose I/Os | All support interrupt generation, alternate functions (USART, SPI, TIM), and LCD segment/com drivers (depending on variant) |
| OSC_IN / OSC_OUT | HSE crystal oscillator terminals | Supports 1–16 MHz external crystal for precise timing; paired with internal 16 MHz HSI for fast startup |
| LSE_IN / LSE_OUT | LSE crystal oscillator terminals | Drives 32.768 kHz crystal for RTC with ±0.5 ppm accuracy and tamper detection |
| SWIM | Single-wire debug interface | Enables non-intrusive programming and debugging using one dedicated pin (no JTAG overhead) |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power RTC | Operates in Active-halt mode (1.4 µA) with BCD calendar, alarm, digital calibration (±0.5 ppm), and anti-tamper detection - eliminates need for external RTC in telematics and gateway modules |
| Dual 12-bit DACs | Buffered outputs on PB4–PB6; support simultaneous or independent operation - enables closed-loop analog control (e.g., LED dimming, sensor biasing) without external DACs |
| Automotive-grade peripherals | 3× LIN 2.0-capable USARTs, SMBus/PMBus-compliant I²C, 4-channel DMA - simplifies integration into vehicle networks with protocol-level compliance |
| Robust power management | 5 programmable BOR thresholds, PVD, POR/PDR, and 5 low-power modes - ensures reliable boot and operation across cold-crank, load-dump, and sleep/wake cycles |
| LCD controller | Supports 8×40 or 4×44 segments with integrated step-up converter - drives automotive instrument cluster displays directly from MCU, reducing BOM count |
Applications
| Automotive Instrument Clusters | Body Control Modules (BCM) |
|---|---|
|
Use Scenario: Driving analog gauges, segmented LCDs, and backlight dimming in digital dashboards. IC Role / Device Role / Timing Role: Primary MCU managing display rendering, CAN/LIN communication, and real-time gauge updates via PWM and DAC outputs. Use Value: Integrated LCD controller and dual DACs eliminate external display drivers; 125 °C rating ensures reliability behind glass dashboards. |
Use Scenario: Centralized control of door locks, window lifts, mirror adjustment, and interior lighting. IC Role / Device Role / Timing Role: System controller coordinating LIN slave nodes, monitoring switch inputs, and driving relays/motors via GPIO and timers. Use Value: 67 I/Os with interrupt mapping and LIN 2.0 USARTs reduce external logic; 400 nA Halt mode enables ultra-low quiescent current in sleep state. |
| Telematics Control Units (TCU) | Smart Rearview Mirrors |
|
Use Scenario: Managing GPS/GNSS module interfaces, cellular modem control, and vehicle event logging during ignition-off periods. IC Role / Device Role / Timing Role: Low-power supervisor handling RTC-triggered wake-ups, secure firmware updates, and CAN bus monitoring while main processor sleeps. Use Value: 1.4 µA Active-halt mode with full RTC preserves timekeeping and enables scheduled wake-ups without external RTC or PMIC. |
Use Scenario: Auto-dimming electrochromic mirrors with ambient light sensing and glare detection. IC Role / Device Role / Timing Role: Analog front-end controller acquiring photodiode signals via 12-bit ADC, computing dimming level, and driving electrochromic cell via DAC output. Use Value: On-chip 12-bit ADC with internal reference and dual DACs provide calibrated analog signal chain - no external precision components required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM8AL3L8ATCY | Same die, but includes enhanced LCD driver supporting 4×44 segments and higher contrast; identical power/performance specs | Required when driving larger automotive LCDs (e.g., center console displays) needing >8×40 segment count | Select STM8AL3L8ATCY only if full LCD capability is needed; otherwise STM8AL318ATCY offers cost-optimized feature set |
| RL78/F13 | Renesas 16-bit RL78 core; lower max frequency (24 MHz), higher Flash density (up to 256 KB), no integrated LCD controller | Better suited for complex motor control or CAN FD gateways where 16-bit processing and larger memory are critical | Choose RL78/F13 for applications requiring >64 KB Flash or CAN FD; STM8AL318ATCY remains optimal for ultra-low-power, LCD-integrated body control |
Compared with STM8AL3L8ATCY, this part omits extended LCD segment drive but retains identical low-power performance and peripheral set; versus RL78/F13, it delivers superior sub-µA sleep current and integrated display control at the cost of 16-bit compute headroom.
Availability
STM8AL318ATCY is available at Aetrix Electronics and suitable for automotive instrument clusters, body control modules, and telematics control units requiring stable component supply across extended temperature and automotive qualification lifecycles.
Supply support for STM8AL318ATCY 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 devices, sensors, and analog ICs for automotive, industrial, and consumer markets.
The STM8AL ultra-low-power 8-bit MCU family targets automotive body electronics where extended battery life, AEC-Q100 compliance, and integrated analog peripherals are essential - balancing performance, power, and cost in resource-constrained ECUs.
FAQ
What is the maximum operating temperature range for STM8AL318ATCY?
The STM8AL318ATCY is AEC-Q100 Grade 1 qualified and specified for continuous operation from –40 °C to +125 °C. This rating is validated across all electrical parameters including Flash endurance, RTC accuracy, and I/O leakage, making it suitable for under-hood and dashboard-mounted automotive applications.
Does STM8AL318ATCY support LIN 2.0 communication natively?
Yes - the device integrates three USARTs with hardware LIN break detection, sync field handling, and checksum generation compliant with LIN 2.0 specification. Each USART supports automatic baud rate detection and slave node response timing per LIN schedule tables without CPU intervention.
How does the RTC maintain accuracy in ultra-low-power modes?
The RTC uses the 32.768 kHz LSE crystal oscillator and digital calibration circuitry achieving ±0.5 ppm accuracy over temperature. In Active-halt mode (1.4 µA), it continues running with full calendar/alarm functionality and anti-tamper detection, independent of main CPU domain.
Can STM8AL318ATCY drive an LCD without external components?
Yes - the integrated LCD controller supports up to 8×40 or 4×44 segments and includes an on-chip step-up converter, eliminating the need for external voltage boosters. It drives common-electrode LCDs directly using dedicated segment and common pins mapped to PORTG and PORTH.
STM8AL318ATCY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 80-LQFP
- Series:
- STM8A
- Packaging:
- Tray
- 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, 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:
STM8AL318ATCY FAQ
1.How can I place an order for STM8AL318ATCY through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AL318ATCY 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 STM8AL318ATCY reliable?
The price and inventory of STM8AL318ATCY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AL318ATCY is usually 5 days.
3.What payment methods are accepted for STM8AL318ATCY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AL318ATCY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AL318ATCY?
STM8AL318ATCY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AL318ATCY 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 STM8AL318ATCY?
For technical support, including STM8AL318ATCY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AL318ATCY requirements.
6.How does Aetrix verify that STM8AL318ATCY is sourced from the original manufacturer or authorized distributors?
All STM8AL318ATCY 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 STM8AL318ATCY meets industry standards.
7.What is the process for return or replacement of STM8AL318ATCY?
All STM8AL318ATCY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AL318ATCY, 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 STM8AL318ATCY part is unused and in its original packaging.
Return procedure for STM8AL318ATCY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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