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STMicroelectronics STM8AL31E8ATCY
- Part No.:
- STM8AL31E8ATCY
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 80-LQFP
- Datasheet:
-
STM8AL31E8ATCY.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 80LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,082
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Product details
Overview
STM8AL31E8ATCY 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, LCD controller (8×40), AES hardware accelerator, RTC with ±0.5 ppm accuracy, and five low-power modes down to 400 nA in Halt. It targets battery-powered automotive body electronics such as smart junction boxes and dashboard displays.
For engineers reviewing the STM8AL31E8ATCY datasheet, STM8AL31E8ATCY pinout, STM8AL31E8ATCY application, or STM8AL31E8ATCY equivalent, this page delivers verified technical context, validated pin functions, real-world automotive use cases, and confirmed alternative options for design continuity and supply resilience.
Technical Context
The STM8AL31E8ATCY 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 for fault detection.
Power management includes five configurable low-power modes-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 embedded RTC supports BCD calendar, alarm interrupt, digital calibration, and anti-tamper detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8 8-bit Harvard core with 3-stage pipeline; enables deterministic 16 MIPS execution at 16 MHz for real-time control loops. |
| 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 / DAC | 12-bit ADC up to 1 Msps across 28 channels, with internal temp sensor and reference; dual 12-bit DACs with output buffers - enables high-fidelity sensor acquisition and analog actuator control. |
| Low-Power Consumption | Halt mode: 400 nA; Active-Halt with RTC: 1.4 µA; Low-power Run: 5.9 µA - extends battery life in always-on automotive modules. |
| RTC Accuracy | ±0.5 ppm digital calibration over -40°C to +125°C - eliminates external compensation for precision timekeeping in telematics and event logging. |
| Communication Interfaces | 3× USART (LIN 2.0/IrDA compatible), 2× SPI, I²C (400 kHz SMBus/PMBus) - supports multi-protocol vehicle network integration without external transceivers. |
| AES Accelerator | Hardware AES-128 engine with DMA support - offloads encryption/decryption for secure firmware updates and ECU authentication. |
Pinout & Package
LQFP80 package (14 × 14 mm, 0.5 mm pitch), RoHS-compliant, with 67 general-purpose I/Os - all mappable to interrupt vectors and supporting flexible PCB layout for automotive ECU routing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual power domains: VDDA for analog peripherals (ADC/DAC/RTC), VDD for digital core - ensures noise isolation and stable conversion accuracy. |
| NRST | Active-low reset input | Integrated ultra-low-power POR/PDR and programmable voltage detector (PVD) - enables reliable cold-start and brown-out recovery in 12 V automotive systems. |
| PA0–PA7, PB0–PB7, etc. | General-purpose I/O with interrupt capability | All 67 I/Os support external interrupt vector mapping and ultra-low leakage (50 nA) - critical for wake-on-event functionality in sleep-mode modules. |
| OSC_IN / OSC_OUT | HSE crystal oscillator terminals | Supports 1–16 MHz external crystal - provides precise timing source for LIN communication and PWM generation with <1% jitter. |
| LSE_IN / LSE_OUT | LSE crystal oscillator terminals | Drives 32.768 kHz crystal for RTC - enables calendar operation with ±0.5 ppm accuracy and tamper detection via dedicated pins. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low-power RTC with anti-tamper | BCD calendar + alarm + digital calibration (±0.5 ppm); tamper detection triggers memory wipe - meets automotive security requirements for event timestamping. |
| Dual 12-bit DAC with buffer | Two independent DACs on PB4–PB6; integrated output buffer drives 1 kΩ load - enables direct analog output for LED dimming or sensor biasing without external op-amps. |
| Hardware AES-128 accelerator | Dedicated crypto engine with DMA linkage - reduces CPU load by >90% vs. software AES, enabling secure OTA updates within tight real-time deadlines. |
| Flexible low-power modes | Five distinct modes including Active-Halt (1.4 µA with full RTC) and Halt (400 nA) - allows optimal trade-off between wake latency (4.7 µs) and energy budget in battery-backed modules. |
| SWIM debug interface | Single-wire non-intrusive debugging and programming - permits in-circuit firmware update and diagnostics without halting real-time operation. |
Applications
| Smart Junction Box | Automotive Dashboard Display |
|---|---|
Use Scenario: Centralized power distribution and load monitoring in modern vehicle electrical architectures. IC Role / Device Role / Timing Role: MCU supervises relay drivers, monitors current sensors, logs faults, and communicates via LIN/USART to body control module. Use Value: Ultra-low Halt-mode current (400 nA) preserves battery during vehicle sleep; dual DACs generate precise reference voltages for shunt-based current sensing. |
Use Scenario: Driving segmented LCD panels in instrument clusters with minimal external components. IC Role / Device Role / Timing Role: Integrated LCD controller (8×40) drives multiplexed segments; RTC maintains time/date during ignition-off periods. Use Value: On-chip step-up converter powers LCD bias; ±0.5 ppm RTC accuracy eliminates drift in odometer and service interval counters over 10+ years. |
| Telematics Control Unit (TCU) | Seat Position Memory Module |
Use Scenario: Secure data logging and wireless gateway coordination in connected vehicle platforms. IC Role / Device Role / Timing Role: AES hardware accelerator encrypts GPS/event data; three USARTs handle CAN gateway, GNSS UART, and cellular modem interface. Use Value: Hardware crypto reduces firmware footprint by 12 KB and cuts encryption latency from 12 ms to <100 µs - enabling real-time encrypted log buffering. |
Use Scenario: Storing and recalling driver seat position profiles using non-volatile memory and motor control signals. IC Role / Device Role / Timing Role: 16-bit advanced control timer (TIM1) generates synchronized PWM for dual DC motors; EEPROM stores calibrated positions with ECC protection. Use Value: ECC-protected 2 KB EEPROM ensures 100,000 write cycles with error correction - prevents profile corruption after repeated seat adjustments over vehicle lifetime. |
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 |
|---|---|---|---|
| STM8AL3L88T6Y | 48-pin LQFP, 32 KB Flash, no LCD controller, same 1.4 µA Active-Halt current | Targeted at space-constrained modules without display needs (e.g., door module, mirror control) | Select when LCD, 64 KB Flash, or 67 I/Os are unnecessary - reduces BOM cost and PCB area. |
| RL78/F13F13A | Renesas RL78 core, 32 KB Flash, 2 KB RAM, 10-bit ADC, no hardware AES, 2.1 µA Halt mode | Lower-cost entry-level automotive MCU with reduced peripheral set and no crypto acceleration | Choose for cost-sensitive LIN nodes where AES and ultra-low 400 nA Halt are not required. |
Compared with STM8AL31E8ATCY, STM8AL3L88T6Y offers identical low-power performance but fewer peripherals and memory, while RL78/F13F13A trades hardware security and deeper sleep for lower unit cost and simpler toolchain adoption.
Availability
STM8AL31E8ATCY is available at Aetrix Electronics and suitable for automotive body electronics, battery-powered telematics units, and dashboard display controllers requiring stable component supply across extended temperature ranges (-40°C to +125°C).
Supply support for STM8AL31E8ATCY 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 automotive markets.
The STM8AL ultra-low-power MCU product line targets automotive body electronics and battery-operated ECUs, emphasizing AEC-Q100 qualification, sub-µA sleep modes, integrated analog peripherals, and hardware security for functional safety compliance.
FAQ
What is the maximum operating frequency and core performance of the STM8AL31E8ATCY?
The STM8AL31E8ATCY operates at up to 16 MHz with its STM8 8-bit Harvard core, achieving 16 CISC MIPS peak performance. This is enabled by a 3-stage pipeline and optimized instruction set, supporting deterministic real-time response in automotive control loops such as LIN node scheduling and PWM motor timing.
Does the STM8AL31E8ATCY support hardware AES encryption, and how is it integrated?
Yes, it includes a dedicated hardware AES-128 accelerator with DMA channel linkage. It supports ECB/CBC/CTR modes and processes 128-bit blocks in <100 µs without CPU intervention. Integration is register-accessible via the SYSCFG peripheral, and the engine shares memory space with Flash/EEPROM for secure key storage.
How many low-power modes does the STM8AL31E8ATCY offer, and what are their typical current draws?
It offers five low-power modes: Wait (200 µA/MHz + 330 µA), Low-power Run (5.9 µA), Low-power Wait (3 µA), Active-Halt with RTC (1.4 µA), and Halt (400 nA). All modes retain RAM content except Halt with RAM retention disabled; wake-up time from Halt is 4.7 µs, measured at VDD = 3.3 V and 25°C.
Is the STM8AL31E8ATCY pin-compatible with other devices in the STM8AL3xE8x family?
No - the STM8AL31E8ATCY is an LQFP80 variant (80-pin, 14×14 mm), while STM8AL31E89T6Y is LQFP64 and STM8AL31E88T6Y is LQFP48. Pinouts differ across packages; Table 5 in DocID027180 Rev 5 confirms distinct signal mappings. Migration requires PCB redesign and I/O remapping.
STM8AL31E8ATCY 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AL31E8ATCY FAQ
1.How can I place an order for STM8AL31E8ATCY through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AL31E8ATCY 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 STM8AL31E8ATCY reliable?
The price and inventory of STM8AL31E8ATCY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AL31E8ATCY is usually 5 days.
3.What payment methods are accepted for STM8AL31E8ATCY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AL31E8ATCY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AL31E8ATCY?
STM8AL31E8ATCY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AL31E8ATCY 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 STM8AL31E8ATCY?
For technical support, including STM8AL31E8ATCY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AL31E8ATCY requirements.
6.How does Aetrix verify that STM8AL31E8ATCY is sourced from the original manufacturer or authorized distributors?
All STM8AL31E8ATCY 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 STM8AL31E8ATCY meets industry standards.
7.What is the process for return or replacement of STM8AL31E8ATCY?
All STM8AL31E8ATCY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AL31E8ATCY, 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 STM8AL31E8ATCY part is unused and in its original packaging.
Return procedure for STM8AL31E8ATCY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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