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STMicroelectronics STM8AF6266UAY
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- Part No.:
- STM8AF6266UAY
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
STM8AF6266UAY.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 32VFQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,605
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Product details
Overview
STM8AF6266UAY from STMicroelectronics is an AEC-Q100 qualified automotive 8-bit microcontroller featuring a 16 MHz STM8A core, 32 Kbyte Flash program memory, 1 Kbyte data EEPROM, 10-bit ADC with 10 multiplexed channels, and integrated LINUART, SPI, and I²C interfaces. It operates across -40 °C to 150 °C and supports high-reliability engine control, body electronics, and powertrain sensor interfacing.
For engineers reviewing the STM8AF6266UAY datasheet, STM8AF6266UAY pinout, STM8AF6266UAY application, or STM8AF6266UAY equivalent, this page delivers verified technical context, package-validated pin functions, automotive-grade timing and analog performance metrics, and real-world substitution guidance for ECU design and qualification.
Technical Context
The STM8AF6266UAY implements a Harvard-architecture STM8A CPU with 3-stage pipeline and 1.6 cycles/instruction average execution efficiency, delivering 10 MIPS at 16 MHz. Its clock system integrates user-trimmable 16 MHz HSI and 128 kHz LSI oscillators plus external crystal support, all monitored by a dedicated clock security system (CSS).
It includes an advanced control timer (TIM1) with 4 CAPCOM channels, 3 complementary outputs, dead-time insertion, and synchronization capability-paired with two 16-bit general-purpose timers (TIM2/TIM3) supporting IC/OC/PWM. The 10-bit ADC achieves ±2 LSB total unadjusted error and supports scan, continuous, and analog watchdog modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8A 8-bit Harvard CPU with 3-stage pipeline; enables deterministic real-time response in safety-critical automotive firmware. |
| Max Clock Frequency | 16 MHz fCPU; sustains full peripheral operation including LIN, SPI, and ADC sampling at rated voltage (3–5.5 V). |
| Flash Memory | 32 Kbyte program Flash with 20-year data retention at 55 °C after 1 kcycle; supports field firmware updates in vehicle life cycle. |
| Data EEPROM | 1 Kbyte true data EEPROM with 300 kcycle endurance; stores calibration data, fault logs, and configuration without external NV memory. |
| ADC Resolution & Channels | 10-bit SAR ADC with ±2 LSB TUE accuracy and up to 10 multiplexed inputs; meets ASIL-B signal acquisition requirements for sensor monitoring. |
| Operating Temperature | -40 °C to +150 °C ambient; validated for under-hood engine control units and transmission control modules. |
| LIN Compliance | LIN 2.2 master/slave with automatic resynchronization; eliminates need for external LIN transceiver in basic node applications. |
Pinout & Package
STM8AF6266UAY is housed in a VFQFPN32 (5 × 5 mm, 0.5 mm pitch) thermally enhanced package optimized for automotive PCB space constraints and thermal dissipation. Pin functions are validated per ST's DocID14952 Rev 11, Table 8 and Figure 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply (3–5.5 V) | Primary digital supply rail; requires local 100 nF decoupling per VDD pin for EMC robustness in noisy automotive environments. |
| VSS | Ground reference | Dedicated ground pins ensure low-impedance return path for analog/digital domains; critical for ADC noise immunity. |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; supports external watchdog or power-on reset circuitry per ISO 16750-2. |
| PA0–PA7 | General-purpose I/O with alternate functions | Configurable as LINUART TX/RX, SPI SCK/MOSI/MISO, I²C SCL/SDA, or ADC inputs; HS I/Os tolerate >5 V on select pins. |
| PB0–PB7 | General-purpose I/O with timer/CAPCOM remapping | Supports TIM1/TIM2 channel outputs, PWM generation, and encoder interface; enables motor control and actuator drive. |
| PC0–PC7 | General-purpose I/O with ADC/CLK remapping | Includes ADC_IN0–ADC_IN7 inputs and clock input options; allows flexible sensor routing without PCB layer rework. |
| PD0–PD7 | General-purpose I/O with SWIM debug interface | SWIM single-wire programming/debug port shares PD0/PD1; enables in-system firmware update without JTAG header. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for 150 °C junction temperature operation; required for engine control, turbocharger, and exhaust aftertreatment systems. |
| Integrated LIN 2.2 UART | Hardware LIN protocol stack with auto-resync and break detection; reduces MCU firmware overhead and improves bus reliability. |
| Advanced Control Timer (TIM1) | 16-bit timer with 3 complementary PWM outputs and programmable dead-time; enables 3-phase inverter control for electric pumps and fans. |
| True data EEPROM | 1 Kbyte on-chip EEPROM with 300 kcycle endurance; eliminates external serial EEPROM and associated BOM cost and layout area. |
| Low-power operating modes | Wait, Auto-wakeup, Halt, and Active-halt modes with configurable clock gating; extends battery life in always-on body control modules. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Real-time monitoring of crankshaft position, throttle angle, and coolant temperature in gasoline/diesel engines. IC Role / Device Role / Timing Role: Primary MCU executing closed-loop fuel injection and ignition timing algorithms with sub-microsecond interrupt latency. Use Value: 16 MHz deterministic execution and LINUART enable direct communication with dashboard and diagnostic tools via vehicle LIN bus. |
Use Scenario: Centralized management of door locks, window lifts, lighting, and HVAC fan speed in passenger vehicles. IC Role / Device Role / Timing Role: System controller coordinating multiple CAN/LIN nodes using internal timers and GPIO-driven relay drivers. Use Value: 32 Kbyte Flash and 1 Kbyte EEPROM store regional lighting profiles and user preferences across vehicle lifetime without external memory. |
| Transmission Control Unit (TCU) | Electric Power Steering (EPS) |
Use Scenario: Gear selection logic, solenoid driver timing, and torque converter clutch control in automatic transmissions. IC Role / Device Role / Timing Role: Safety-aware controller managing PWM-driven shift solenoids and monitoring transmission fluid temperature via ADC. Use Value: TIM1 dead-time insertion prevents shoot-through in H-bridge solenoid drivers; 150 °C rating ensures operation near hot gearbox housing. |
Use Scenario: Torque assist calculation and motor phase current regulation in column-assist EPS systems. IC Role / Device Role / Timing Role: Real-time motor controller using ADC-sampled current feedback and complementary PWM outputs to drive 3-phase inverter. Use Value: Integrated 10-bit ADC with scan mode captures three shunt voltages simultaneously; TIM1 complements enable precise FOC timing. |
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 |
|---|---|---|---|
| STM8AF6268UAY | Same core, Flash, and peripherals; differs only in factory-programmed option bytes (e.g., ROP level, boot address). | Identical functional use in production ECUs; selected when specific bootloader or security settings are preconfigured. | Choose when matching existing firmware image checksum or requiring identical option byte defaults out-of-box. |
| RL78/F13 | Renesas RL78 core (16-bit), 32 Kbyte Flash, 2.7–5.5 V, -40 to 105 °C; lacks integrated LIN but adds CAN 2.0B. | Suitable for mid-tier BCMs where CAN backbone integration is prioritized over LIN node cost reduction. | Select if CAN interface is mandatory and extended temperature range is not required; verify LIN bridge IC necessity. |
Compared with STM8AF6266UAY, STM8AF6268UAY offers identical hardware functionality with variant option byte defaults, while RL78/F13 trades LIN integration and 150 °C rating for CAN capability and 16-bit architecture-requiring redesign of communication stack and thermal margin analysis.
Availability
STM8AF6266UAY is available at Aetrix Electronics and suitable for engine control units, body control modules, and transmission control units requiring stable component supply across automotive production lifecycles.
Supply support for STM8AF6266UAY 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 automotive ICs for industrial and transportation markets.
The STM8A automotive microcontroller product line targets cost-sensitive, high-reliability embedded control applications-including powertrain, chassis, and body electronics-where AEC-Q100 qualification, extended temperature operation, and integrated LIN are essential.
FAQ
What is the maximum operating junction temperature for STM8AF6266UAY?
The STM8AF6266UAY is qualified to AEC-Q100 Grade 0 with a maximum junction temperature of +150 °C. This is validated across its full operating voltage range (3–5.5 V) and supported by thermal resistance data (θJA = 45 °C/W for VFQFPN32 per DocID14952 Rev 11, Table 49). Designers must maintain PCB copper pour and airflow to stay within this limit during peak load conditions.
Does STM8AF6266UAY support in-circuit debugging without external hardware?
Yes-STM8AF6266UAY features a Single Wire Interface Module (SWIM) accessible via PD0 (SWIM) and PD1 (RST) pins. This enables full-speed debugging, flash programming, and memory inspection using ST-LINK/V2 or compatible debuggers without JTAG headers or additional interface ICs.
Can the internal 16 MHz RC oscillator be calibrated for production accuracy?
Yes-the 16 MHz HSI oscillator supports user trimming via the CLK_HSITRIMR register (address 0x50C0), allowing adjustment in ±16 steps (±0.5% typical step size). Factory calibration data is stored in option bytes, and end users can perform one-time trim during final test to achieve ±1% accuracy across voltage and temperature.
Is there hardware support for LIN bus wakeup from low-power mode?
Yes-STM8AF6266UAY supports LIN bus wakeup from Wait and Halt modes via the LINUART peripheral. The LIN break detection circuit remains active during low-power states and triggers an interrupt upon valid bus activity, enabling fast (<100 µs) wake-up without CPU polling overhead.
STM8AF6266UAY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-VFQFN Exposed Pad
- Series:
- STM8A
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- STM8A
- Core Size:
- 8-Bit
- Speed:
- 16MHz
- Connectivity:
- I2C, LINbus, SPI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 25
- Program Memory Size:
- 32KB (32K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 1K x 8
- RAM Size:
- 2K x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 5.5V
- Data Converters:
- A/D 7x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AF6266UAY FAQ
1.How can I place an order for STM8AF6266UAY through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF6266UAY 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 STM8AF6266UAY reliable?
The price and inventory of STM8AF6266UAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF6266UAY is usually 5 days.
3.What payment methods are accepted for STM8AF6266UAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF6266UAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF6266UAY?
STM8AF6266UAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF6266UAY 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 STM8AF6266UAY?
For technical support, including STM8AF6266UAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF6266UAY requirements.
6.How does Aetrix verify that STM8AF6266UAY is sourced from the original manufacturer or authorized distributors?
All STM8AF6266UAY 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 STM8AF6266UAY meets industry standards.
7.What is the process for return or replacement of STM8AF6266UAY?
All STM8AF6266UAY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF6266UAY, 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 STM8AF6266UAY part is unused and in its original packaging.
Return procedure for STM8AF6266UAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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