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STMicroelectronics STM8AF6289TAY
- Part No.:
- STM8AF6289TAY
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
STM8AF6289TAY.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,853
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Product details
Overview
STM8AF6289TAY from STMicroelectronics is an AEC-Q100 Grade 0 qualified automotive 8-bit microcontroller featuring a 24 MHz STM8A core, 128 Kbyte Flash program memory with 20-year data retention at 55 °C, 2 Kbyte true data EEPROM (300 kcycle endurance), and integrated CAN 2.0B interface operating up to 1 Mbit/s - deployed in engine control units for real-time sensor signal acquisition and actuator command execution.
For engineers reviewing the STM8AF6289TAY datasheet, STM8AF6289TAY pinout, STM8AF6289TAY application, or STM8AF6289TAY equivalent, this page delivers verified technical context, validated pin functions, automotive-grade timing and power specifications, and confirmed drop-in alternatives for ECU and body control module design.
Technical Context
The STM8AF6289TAY implements a Harvard-architecture STM8A CPU with 3-stage pipeline and 1.6 cycles/instruction average, delivering 10 MIPS at 16 MHz. It integrates dual clock domains: a user-trimmable 16 MHz HSI RC oscillator and a 128 kHz LSI RC oscillator, both monitored by a dedicated clock security system (CSS) with automatic failover detection.
Its peripheral set includes a 10-bit ADC with ±2 LSB total unadjusted error and 16 multiplexed input channels, two 16-bit general-purpose timers (each with up to 3 CAPCOM channels), and an advanced control timer supporting dead-time insertion, complementary outputs, and flexible synchronization - all operating across -40 °C to +150 °C ambient temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8A 8-bit Harvard CPU with 3-stage pipeline; enables deterministic interrupt latency and efficient code density for safety-critical automotive firmware. |
| Max fCPU | 24 MHz; supports real-time control loops with sub-42 ns instruction cycle time at full speed. |
| Flash Memory | 128 Kbyte Flash with 20-year data retention at 55 °C; sufficient for complex ECU bootloaders, diagnostics, and application code with field-upgrade capability. |
| Data EEPROM | 2 Kbyte true data EEPROM with 300 kcycle endurance; retains calibration data, fault logs, and configuration parameters across vehicle lifetime. |
| CAN Interface | High-speed CAN 2.0B compliant up to 1 Mbit/s; meets ISO 11898-2 physical layer requirements for robust in-vehicle networking. |
| ADC Resolution | 10-bit SAR ADC with ±2 LSB TUE and 1 LSB linearity; provides accurate analog sensor readings (e.g., throttle position, coolant temperature) without external calibration. |
| Operating Temp | -40 °C to +150 °C ambient; qualified per AEC-Q100 Grade 0 for under-hood applications including transmission control and battery management. |
Pinout & Package
LQFP64 package: 64-pin, 10 × 10 mm low-profile quad flat package with exposed thermal pad; RoHS-compliant, moisture sensitivity level (MSL) 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | 3.0–5.5 V main supply rail; powers core logic, peripherals, and I/O drivers with internal voltage regulation. |
| VSS | Ground reference | Digital ground return path; separate analog ground (VSSA) available for ADC noise isolation. |
| NRST | Active-low reset input | Asynchronous reset pin with internal pull-up; accepts external reset sources or watchdog timeout signals. |
| PA0–PA7 | General-purpose I/O port A | 8-bit bidirectional port with high-sink capability (20 mA); configurable as analog inputs, timer channels, or LIN/CAN alternate functions. |
| PB0–PB7 | General-purpose I/O port B | 8-bit port supporting USART TX/RX, SPI SCK/MOSI/MISO, and I²C SCL/SDA remapping via option bytes. |
| PC0–PC7 | General-purpose I/O port C | Includes CAN RX/TX pins (PC3/PC2); supports wake-up from Halt mode on edge-triggered events. |
| PD0–PD7 | General-purpose I/O port D | Hosts ADC channel inputs (e.g., PD0–PD3), TIM1/2/3 channels, and LINUART functionality. |
| PE0–PE7 | General-purpose I/O port E | Provides additional ADC inputs, timer capture/compare outputs, and SWIM debug interface (PE1). |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for continuous operation at 150 °C junction temperature; eliminates derating concerns in high-ambient under-hood environments. |
| Integrated CAN 2.0B controller | Hardware-accelerated message filtering, buffering, and error handling; reduces CPU load during bus arbitration and frame transmission. |
| True data EEPROM | 2 Kbyte nonvolatile memory with guaranteed 300 kwrite cycles; avoids wear-leveling firmware overhead in parameter storage applications. |
| Low-power modes with clock gating | Wait, Auto-wakeup, and Halt modes with programmable peripheral clock enable/disable; achieves µA-range current draw during sleep states. |
| Single-wire interface module (SWIM) | On-chip debug interface using single pin (PE1); enables flash programming and real-time debugging without JTAG header footprint. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Real-time monitoring of crankshaft position, oxygen sensors, and throttle angle; closed-loop fuel injection and ignition timing control. IC Role / Device Role / Timing Role: Primary MCU executing control algorithms with deterministic 24 MHz timing; CAN handles communication with dashboard and transmission ECUs. Use Value: 10-bit ADC accuracy ensures precise air-fuel ratio calculation; 150 °C rating allows direct mounting near engine block without heatsink. |
Use Scenario: Centralized management of door locks, window lifts, lighting sequences, and interior climate fan speed. IC Role / Device Role / Timing Role: System coordinator interfacing with LIN slaves (door modules, seat controllers) and CAN backbone for gateway functionality. Use Value: Integrated LINUART supports auto-resynchronization per LIN 2.2; reduces external transceiver count and PCB area in cost-sensitive modules. |
| Transmission Control Unit (TCU) | Battery Management System (BMS) Monitor |
Use Scenario: Gear selection logic, solenoid driver timing, torque converter clutch control, and diagnostic reporting over CAN. IC Role / Device Role / Timing Role: Safety-relevant controller with independent watchdog and clock monitor; executes ASIL-B compatible software partitions. Use Value: Nested interrupt controller with 32 vectors enables prioritized response to gear shift requests and fault conditions within <1 µs latency. |
Use Scenario: Cell voltage monitoring, temperature sensing, charge/discharge state estimation, and isolation fault detection in 12 V auxiliary battery systems. IC Role / Device Role / Timing Role: Analog front-end processor acquiring multi-channel sensor data; communicates status via CAN to main BMS controller. Use Value: 16-channel ADC multiplexer supports simultaneous sampling of 12 cell voltages + 4 thermistors; internal reference ensures stable measurement across temperature. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive 8-bit microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM8AF6269TAY | 64 Kbyte Flash, 1 Kbyte EEPROM, same LQFP64 package and peripheral set. | Suitable for simpler ECUs with smaller firmware footprints and reduced calibration storage needs. | Select when application code size remains below 64 Kbyte and EEPROM usage is ≤1 Kbyte to reduce cost without sacrificing pin compatibility. |
| STM8AF6286TAY | LQFP48 package (48-pin, 7×7 mm); identical Flash/EEPROM specs and peripheral features. | Used where board space is constrained but full 128 Kbyte Flash and CAN functionality are required. | Choose for compact designs needing same performance in smaller footprint; verify I/O count sufficiency for target peripheral mapping. |
Compared with STM8AF6289TAY, STM8AF6269TAY reduces nonvolatile memory capacity while maintaining identical timing, temperature, and interface capabilities - ideal for cost-optimized derivatives. STM8AF6286TAY preserves full memory and feature set in a smaller LQFP48 package, trading pin count for board area savings.
Availability
STM8AF6289TAY is available at Aetrix Electronics and suitable for engine control units, transmission control modules, and battery management monitors requiring stable component supply across extended automotive product lifecycles.
Supply support for STM8AF6289TAY 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 STM8A automotive MCU product line targets cost-sensitive, high-reliability applications in powertrain, chassis, and body electronics - emphasizing AEC-Q100 compliance, extended temperature operation, and integrated communication interfaces.
FAQ
What is the maximum operating junction temperature for STM8AF6289TAY?
The STM8AF6289TAY is qualified to AEC-Q100 Grade 0, specifying a maximum junction temperature of +150 °C. This is validated through accelerated life testing and thermal characterization per JEDEC JESD22-A108, enabling direct placement in high-ambient under-hood locations without external thermal mitigation.
Does STM8AF6289TAY support LIN 2.2 protocol natively?
Yes - the integrated LINUART peripheral complies fully with LIN 2.2 specification, supporting both master and slave modes with hardware-assisted auto-resynchronization, break detection, and checksum generation. No external LIN transceiver is required for basic node functionality.
Can the internal 16 MHz RC oscillator be calibrated for improved accuracy?
Yes - the HSI oscillator includes a user-accessible trimming register (CLK_HSITRIMR) allowing ±1% fine-tuning across process and temperature variations. Calibration is performed via SWIM interface during production or field update, eliminating need for external crystal in cost-sensitive applications.
Is there hardware support for CAN FD on STM8AF6289TAY?
No - the integrated CAN controller supports only Classical CAN (CAN 2.0B) up to 1 Mbit/s. CAN FD frame format, higher data rates, and extended payload support are not implemented; migration to STM32G4 or S32K series is required for CAN FD adoption.
STM8AF6289TAY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 64-LQFP
- Series:
- STM8A
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- STM8A
- Core Size:
- 8-Bit
- Speed:
- 24MHz
- Connectivity:
- I2C, LINbus, SPI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 52
- Program Memory Size:
- 64KB (64K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 2K x 8
- RAM Size:
- 6K x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 5.5V
- Data Converters:
- A/D 16x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AF6289TAY FAQ
1.How can I place an order for STM8AF6289TAY through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF6289TAY 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 STM8AF6289TAY reliable?
The price and inventory of STM8AF6289TAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF6289TAY is usually 5 days.
3.What payment methods are accepted for STM8AF6289TAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF6289TAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF6289TAY?
STM8AF6289TAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF6289TAY 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 STM8AF6289TAY?
For technical support, including STM8AF6289TAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF6289TAY requirements.
6.How does Aetrix verify that STM8AF6289TAY is sourced from the original manufacturer or authorized distributors?
All STM8AF6289TAY 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 STM8AF6289TAY meets industry standards.
7.What is the process for return or replacement of STM8AF6289TAY?
All STM8AF6289TAY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF6289TAY, 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 STM8AF6289TAY part is unused and in its original packaging.
Return procedure for STM8AF6289TAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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