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STMicroelectronics STM8AL31E8ATAY
- Part No.:
- STM8AL31E8ATAY
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 80-LQFP
- Datasheet:
-
STM8AL31E8ATAY.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 80LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,050
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Product details
Overview
STM8AL31E8ATAY from STMicroelectronics is an AEC-Q100 Grade 1 qualified automotive 8-bit ultra-low-power MCU featuring 64 KB Flash, 2 KB data EEPROM with ECC, 4 KB RAM, 12-bit ADC (1 Msps, 28 channels), dual 12-bit DACs, RTC with ±0.5 ppm digital calibration, AES hardware accelerator, and LCD controller (8×40/4×44). It operates from 1.8–3.6 V across –40 to 125 °C and targets body control modules, smart sensors, and low-power dashboard displays.
For engineers reviewing the STM8AL31E8ATAY datasheet, STM8AL31E8ATAY pinout, STM8AL31E8ATAY application, or STM8AL31E8ATAY equivalent, key selection criteria include ultra-low-power operation (1.4 µA Active-Halt with RTC), automotive-grade reliability (AEC-Q100 Grade 1), integrated LCD driver with step-up converter, dual DAC output buffering, and SWIM-based non-intrusive debugging support.
Technical Context
The STM8AL31E8ATAY 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 for low-power RTC.
Power management includes five configurable low-power modes-Wait, Low-power Run (5.9 µA), Low-power Wait (3 µA), Active-Halt with full RTC (1.4 µA), and Halt (400 nA)-with fast wake-up (4.7 µs) and per-I/O leakage as low as 50 nA. The RTC supports BCD calendar, alarm interrupt, anti-tamper detection, and digital calibration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | Harvard, 3-stage pipeline STM8 CPU; enables deterministic timing and efficient code execution in safety-critical automotive functions. |
| Max Clock Frequency | 16 MHz; delivers 16 CISC MIPS peak performance while maintaining ultra-low power consumption in active mode. |
| Flash / EEPROM / RAM | 64 KB Flash with RWW and ECC, 2 KB data EEPROM with ECC, 4 KB RAM; supports robust firmware updates and secure parameter storage. |
| ADC Resolution & Speed | 12-bit, up to 1 Msps with 28 input channels; enables high-fidelity sensor acquisition in battery-powered ECUs. |
| DAC Channels | Two 12-bit buffered DACs; provides precise analog output generation for actuator control or reference voltage synthesis. |
| Low-Power Halt Current | 400 nA at VDD = 1.65–3.6 V; allows multi-year operation on coin-cell batteries in always-on monitoring applications. |
| RTC Accuracy | ±0.5 ppm with digital calibration; eliminates external temperature compensation in time-critical automotive clocks. |
| AEC-Q100 Grade | Grade 1 (–40 to 125 °C); certified for under-hood and cabin electronics requiring extended temperature reliability. |
Pinout & Package
LQFP80 package (14 × 14 mm, 0.5 mm pitch), RoHS-compliant, with 67 I/Os mappable to interrupt vectors and dedicated LCD segment/common drivers.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Separate analog/digital supply domains enable noise isolation for ADC/DAC operation. |
| NRST | Active-low reset input | Supports ultra-low-power POR/PDR and programmable BOR with 5 thresholds for robust brown-out recovery. |
| PA0–PA7, PB0–PB7, etc. | General-purpose I/Os | All 67 pins support interrupt vector mapping and alternate functions including USART, SPI, I²C, timers, and LCD segments. |
| OSC_IN / OSC_OUT | HSE crystal oscillator interface | Supports 1–16 MHz external crystals for precise timing in communication and motor control subsystems. |
| LSE_IN / LSE_OUT | LSE crystal oscillator interface | Drives 32.768 kHz crystal for RTC with ±0.5 ppm accuracy and tamper detection capability. |
| VLCD | LCD step-up converter output | Generates regulated voltage for LCD biasing without external charge pump, reducing BOM count. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power RTC | BCD calendar + alarm + digital calibration (±0.5 ppm) + anti-tamper detection - enables secure, long-term timekeeping in telematics units. |
| Dual 12-bit DACs | Buffered outputs on PB4–PB6 with rail-to-rail swing - supports closed-loop actuator control without external op-amps. |
| Hardware AES accelerator | 128-bit key support with DMA-triggered encryption/decryption - accelerates secure boot and firmware update verification. |
| Flexible low-power modes | 5 distinct modes including Active-Halt (1.4 µA with RTC running) and Halt (400 nA) - extends battery life in always-on vehicle presence detection. |
| SWIM debug interface | Single-wire, non-intrusive programming and real-time debugging - enables in-system firmware updates without halting critical control loops. |
| Integrated LCD controller | Supports 8×40 or 4×44 segments with internal step-up converter - eliminates external LCD bias IC in instrument cluster designs. |
Applications
| Body Control Module (BCM) | Smart Rearview Mirror |
|---|---|
Use Scenario: Centralized control of door locks, window lifts, lighting, and interior sensors in modern vehicles. IC Role / Device Role / Timing Role: Main MCU managing CAN/LIN communication, PWM-driven LED dimming, and low-power sleep/wake coordination. Use Value: AEC-Q100 Grade 1 qualification and 125 °C operation ensure reliability in engine bay-adjacent mounting; ultra-low Halt current (400 nA) minimizes parasitic drain during vehicle off-state. |
Use Scenario: Integrated mirror with auto-dimming, blind-spot detection display, and ambient light sensing. IC Role / Device Role / Timing Role: Sensor fusion hub and LCD driver controlling segmented display with real-time brightness adjustment. Use Value: On-chip LCD controller (8×40) with VLCD step-up converter eliminates external bias IC; 12-bit ADC reads ambient light sensor with 1 Msps sampling for responsive dimming. |
| Automotive Tire Pressure Monitor (TPMS) ECU | Dashboard Cluster Subsystem |
Use Scenario: Battery-powered TPMS node collecting pressure, temperature, and acceleration data for wireless transmission. IC Role / Device Role / Timing Role: Ultra-low-power sensor acquisition MCU with RTC-triggered wake-up and AES-secured data packaging. Use Value: Active-Halt mode (1.4 µA with RTC) enables multi-year operation on CR2032; integrated temperature sensor and 12-bit ADC reduce component count. |
Use Scenario: Secondary display controller for fuel economy, range, or ADAS status in digital instrument clusters. IC Role / Device Role / Timing Role: Dedicated display processor handling LCD refresh, beeper tones (1/2/4 kHz), and CAN message parsing. Use Value: Beeper timer with fixed frequencies drives audible alerts without CPU intervention; dual DACs generate precise reference voltages for analog gauge drivers. |
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 |
|---|---|---|---|
| STM8AL3L8ATAY | 48 KB Flash, no AES accelerator, same 64 KB-equivalent peripheral set except reduced DAC channel count (1 vs 2). | Suitable for cost-sensitive entry-level BCMs where cryptographic security is not required. | Select when AES is unnecessary and Flash budget is ≤48 KB; retains identical low-power modes and LCD capability. |
| RL78/F13-GB | Renesas RL78 core, 16-bit, 256 KB Flash, 20 KB RAM, but higher active current (120 µA/MHz) and no integrated LCD controller. | Better suited for complex gateway or infotainment bridge functions requiring larger memory and higher throughput. | Choose for applications needing >64 KB code space or 16-bit processing headroom, accepting higher power and external LCD bias. |
Compared with STM8AL3L8ATAY, the STM8AL31E8ATAY adds AES security and dual DACs at no penalty in power or package size; versus RL78/F13-GB, it delivers superior ultra-low-power efficiency and integrated LCD drive-but with less memory and 8-bit instruction throughput.
Availability
STM8AL31E8ATAY is available at Aetrix Electronics and suitable for automotive body control modules, smart sensor nodes, dashboard display subsystems, and tire pressure monitoring systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for STM8AL31E8ATAY 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 STM8AL ultra-low-power 8-bit MCU family targets automotive body electronics and battery-operated systems where AEC-Q100 compliance, sub-microamp power states, and integrated peripherals like LCD and AES are essential design requirements.
FAQ
What is the maximum operating temperature for STM8AL31E8ATAY?
The STM8AL31E8ATAY 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 write/erase endurance, ADC linearity, and RTC accuracy, making it suitable for under-hood and cabin-mounted automotive ECUs.
Does STM8AL31E8ATAY support in-circuit programming via SWIM?
Yes, STM8AL31E8ATAY supports single-wire interface module (SWIM) programming and debugging using standard ST-LINK/V2 or compatible tools. SWIM enables non-intrusive firmware updates, real-time variable inspection, and breakpoint execution without halting peripheral operation or consuming additional I/O pins.
Can the integrated LCD controller drive both segment and common lines simultaneously?
Yes, the STM8AL31E8ATAY's LCD controller supports up to 8 commons and 40 segments (8×40) or 4 commons and 44 segments (4×44), with built-in step-up converter (VLCD) generating regulated bias voltage. It operates independently of the CPU core and supports static, 2-, 3-, or 4-mux configurations.
How many independent low-power modes does STM8AL31E8ATAY offer?
The STM8AL31E8ATAY offers five distinct low-power modes: Wait, Low-power Run (5.9 µA), Low-power Wait (3 µA), Active-Halt with full RTC (1.4 µA), and Halt (400 nA). Each mode provides defined retention of RAM, registers, and peripheral state, with configurable wake-up sources including RTC alarm, I/O change, and comparator output.
STM8AL31E8ATAY 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AL31E8ATAY FAQ
1.How can I place an order for STM8AL31E8ATAY through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AL31E8ATAY 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 STM8AL31E8ATAY reliable?
The price and inventory of STM8AL31E8ATAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AL31E8ATAY is usually 5 days.
3.What payment methods are accepted for STM8AL31E8ATAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AL31E8ATAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AL31E8ATAY?
STM8AL31E8ATAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AL31E8ATAY 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 STM8AL31E8ATAY?
For technical support, including STM8AL31E8ATAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AL31E8ATAY requirements.
6.How does Aetrix verify that STM8AL31E8ATAY is sourced from the original manufacturer or authorized distributors?
All STM8AL31E8ATAY 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 STM8AL31E8ATAY meets industry standards.
7.What is the process for return or replacement of STM8AL31E8ATAY?
All STM8AL31E8ATAY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AL31E8ATAY, 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 STM8AL31E8ATAY part is unused and in its original packaging.
Return procedure for STM8AL31E8ATAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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