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STMicroelectronics STM8AF6266TAX
- Part No.:
- STM8AF6266TAX
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
STM8AF6266TAX.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,901
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Product details
Overview
STM8AF6266TAX from STMicroelectronics is an AEC-Q100 qualified automotive 8-bit microcontroller featuring a 16 MHz STM8A core, 32 Kbyte Flash program memory with 20-year data retention at 55 °C, 1 Kbyte true data EEPROM (300 kcycle endurance), and integrated 10-bit ADC with 2 LSB TUE accuracy across up to 10 channels. It supports LIN 2.2-compliant communication, SPI up to 8 Mbit/s, I²C up to 400 Kbit/s, and operates from 3 to 5.5 V in ambient temperatures up to 150 °C - deployed in engine control modules and body electronics.
For engineers reviewing the STM8AF6266TAX datasheet, STM8AF6266TAX pinout, STM8AF6266TAX application, or STM8AF6266TAX equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade operating parameters, and real-world use cases for powertrain and chassis subsystems.
Technical Context
The STM8AF6266TAX implements a Harvard-architecture STM8A CPU with 3-stage pipeline and average 1.6 cycles/instruction throughput, delivering 10 MIPS at 16 MHz. Its clock system integrates trimmable 16 MHz HSI and 128 kHz LSI oscillators plus external crystal support, all monitored by a dedicated clock security system (CSS) for fail-safe operation.
Interrupt handling uses a nested controller with 32 vectors and up to 34 external interrupt sources mapped across five vectors. Memory subsystem includes separate Flash (32 KB), true data EEPROM (1 KB), and 2 KB RAM, with hardware write protection, read-out protection (ROP), and user boot code (UBC) safeguards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8A 8-bit Harvard core with 3-stage pipeline; enables deterministic timing and 10 MIPS @ 16 MHz for real-time control loops. |
| Flash Memory | 32 Kbyte program Flash with 20-year data retention at 55 °C after 1 kcycle; supports field firmware updates in automotive ECUs. |
| Data EEPROM | 1 Kbyte true data EEPROM rated for 300 kcycles; stores calibration data, fault logs, and configuration without external NV memory. |
| ADC Resolution | 10-bit SAR ADC with 2 LSB total unadjusted error (TUE); provides accurate sensor signal digitization for throttle position or coolant temperature. |
| Operating Voltage | 3.0–5.5 V supply range; compatible with 5 V automotive battery systems and tolerant of load-dump transients when paired with external protection. |
| Temperature Range | −40 to +150 °C ambient; certified for under-hood deployment in engine management and transmission control units. |
| LIN Interface | LINUART compliant with LIN 2.2 spec; supports master/slave modes with automatic resynchronization for robust low-cost vehicle networking. |
Pinout & Package
STM8AF6266TAX is housed in a VFQFPN32 (5 × 5 mm, 0.5 mm pitch) package with 32 pins, optimized for high-density automotive PCB layouts and thermal performance in constrained spaces.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Primary 3–5.5 V supply rail; requires local 100 nF decoupling per VDD pin for noise immunity in noisy automotive environments. |
| VSS | Ground reference | Dedicated ground return path; multiple VSS pins reduce impedance and improve EMI resilience during high-speed peripheral operation. |
| NRST | Active-low reset input | Asynchronous reset pin with internal pull-up; accepts external watchdog or power-on reset signals with programmable reset timing. |
| SWIM | Single-wire interface module | Debug and programming interface using one pin; enables in-circuit programming and real-time debugging without JTAG overhead. |
| PA0–PA7 | General-purpose I/O port A | 8-bit bidirectional port with HS capability on PA0–PA3; supports analog input, digital I/O, and timer capture/compare functions. |
| PB0–PB7 | General-purpose I/O port B | 8-bit bidirectional port; PB1/PB2 configurable as LINUART TX/RX; PB4/PB5 as SPI SCK/MOSI; PB6/PB7 as I²C SCL/SDA. |
| PC0–PC7 | General-purpose I/O port C | 8-bit bidirectional port; PC0–PC3 support ADC channel inputs; PC4–PC7 map to TIM1 complementary outputs with dead-time insertion. |
| PD0–PD7 | General-purpose I/O port D | 8-bit bidirectional port; PD0–PD3 serve as TIM2/TIM3 CAPCOM channels; PD4–PD7 support advanced timer synchronization signals. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for −40 to +150 °C operation with full automotive reliability testing - required for engine control and safety-critical body modules. |
| Advanced control timer (TIM1) | 16-bit timer with 4 CAPCOM channels, 3 complementary outputs, and hardware dead-time insertion - enables precise 3-phase motor gate drive without software overhead. |
| Hardware LIN 2.2 stack | On-chip LINUART with automatic baud rate resynchronization and frame checksum generation - eliminates external LIN transceiver for cost-sensitive nodes. |
| Low-power modes (Wait/Halt) | User-definable clock gating across peripherals; <1 µA halt current with RTC active - extends battery life in always-on vehicle modules like door controllers. |
| Analog watchdog & scan mode | Configurable ADC monitoring of critical sensors (e.g., oil pressure, brake fluid level); triggers interrupt on threshold violation without CPU polling. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Real-time monitoring and actuation of fuel injection timing, ignition spark advance, and idle speed control based on crankshaft/camshaft position, MAP, and coolant temperature inputs. IC Role / Device Role / Timing Role: Primary MCU executing closed-loop combustion control algorithms with sub-millisecond interrupt latency and deterministic PWM output for injector drivers. Use Value: Integrated 10-bit ADC with analog watchdog ensures reliable sensor validation; LIN interface enables communication with dashboard and diagnostic tools over single-wire bus. |
Use Scenario: Centralized management of lighting (headlamps, interior LEDs), window lift, mirror adjustment, and door lock actuators in modern passenger vehicles. IC Role / Device Role / Timing Role: System coordinator interfacing with LIN slave nodes (e.g., seat modules, mirror ECUs) while managing local PWM dimming and GPIO-driven relays. Use Value: 32 Kbyte Flash supports multi-feature firmware; 1 Kbyte EEPROM stores user preferences and fault history; HS I/Os drive LED drivers directly without level shifters. |
| Transmission Control Unit (TCU) | Heating/Ventilation Control |
|
Use Scenario: Gear selection logic, clutch engagement timing, and torque converter lock-up control using transmission speed, oil temperature, and throttle position feedback. IC Role / Device Role / Timing Role: Safety-relevant controller with dual-clock monitoring (HSI + HSE), independent watchdog, and memory ECC - meeting ASIL-B functional safety requirements. Use Value: Clock security system detects oscillator failure and forces safe state; advanced timer generates synchronized PWM for solenoid valve drivers with programmable dead time. |
Use Scenario: Climate control panel with touch interface, fan speed regulation, blend door actuation, and cabin temperature feedback via NTC sensors. IC Role / Device Role / Timing Role: Human-machine interface (HMI) processor handling button debouncing, display updates, and I²C communication with HVAC ICs and sensor arrays. Use Value: I²C interface supports multi-drop sensor networks; 2 Kbyte RAM buffers UI state and sensor fusion data; low-power modes extend standby battery life. |
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 |
|---|---|---|---|
| STM8AF6268TAY | Same core, Flash, and peripherals but in LQFP48 package with 48 pins and additional I/O (up to 38 user pins vs. 29 in VFQFPN32). | Used where higher pin count is needed for expanded sensor interfaces or legacy connector compatibility. | Select when board layout allows larger footprint and extra GPIOs are required for modular design scalability. |
| RL78/F13 | Renesas RL78 core (16-bit), 32 Kbyte Flash, 2.7–5.5 V, −40 to +125 °C; lacks AEC-Q100 Grade 0 rating and LIN 2.2 hardware acceleration. | Suitable for non-under-hood applications such as infotainment accessories or rear-seat controls where extended temperature range is not mandatory. | Choose only for cost-sensitive Tier-2 modules outside engine bay; verify LIN protocol implementation requires external software stack. |
Compared with STM8AF6266TAX, STM8AF6268TAY offers more I/O in a larger package but identical functionality, while RL78/F13 trades automotive temperature grade and hardware LIN for 16-bit processing headroom - making STM8AF6266TAX optimal for compact, high-temp, LIN-centric ECU designs.
Availability
STM8AF6266TAX is available at Aetrix Electronics and suitable for engine control units, body control modules, and transmission control units requiring stable component supply across long automotive production lifecycles.
Supply support for STM8AF6266TAX 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 STM8A product line targets cost-sensitive, high-reliability automotive applications - delivering AEC-Q100 qualified 8-bit MCUs with integrated LIN, robust analog peripherals, and extended temperature operation for powertrain and chassis systems.
FAQ
What is the maximum operating frequency and corresponding voltage range for STM8AF6266TAX?
The STM8AF6266TAX achieves a maximum CPU frequency of 16 MHz across its full 3.0–5.5 V supply range, as confirmed by Figure 8 (fCPUmax vs. VDD) in the official datasheet. This performance is sustained at junction temperatures up to +150 °C, with no derating required within the specified operating conditions.
Does STM8AF6266TAX include hardware support for LIN communication?
Yes - it integrates a LINUART peripheral compliant with LIN 2.2 specification, supporting both master and slave modes with automatic baud rate resynchronization, frame checksum generation, and wake-up detection. No external LIN transceiver is needed for basic node functionality.
How many I/O pins are available in the VFQFPN32 package of STM8AF6266TAX?
The VFQFPN32 package provides 29 user I/O pins, including 10 high-speed (HS) capable pins. Pin count is confirmed in Table 8 (pin description) and Figure 3 (VFQFPN/LQFP 32-pin pinout) of the datasheet, with dedicated functions assigned to each pin per alternate function remapping registers.
What is the endurance and data retention specification for the on-chip EEPROM?
The STM8AF6266TAX features 1 Kbyte of true data EEPROM with guaranteed endurance of 300,000 write/erase cycles and data retention of 20 years at 55 °C after 1,000 cycles - verified in Section 10.3.5 (Memory characteristics) and Table 34 of the datasheet.
STM8AF6266TAX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-LQFP
- Series:
- STM8A
- Packaging:
- Tape & Reel (TR)
- 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:
STM8AF6266TAX FAQ
1.How can I place an order for STM8AF6266TAX through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF6266TAX 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 STM8AF6266TAX reliable?
The price and inventory of STM8AF6266TAX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF6266TAX is usually 5 days.
3.What payment methods are accepted for STM8AF6266TAX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF6266TAX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF6266TAX?
STM8AF6266TAX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF6266TAX 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 STM8AF6266TAX?
For technical support, including STM8AF6266TAX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF6266TAX requirements.
6.How does Aetrix verify that STM8AF6266TAX is sourced from the original manufacturer or authorized distributors?
All STM8AF6266TAX 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 STM8AF6266TAX meets industry standards.
7.What is the process for return or replacement of STM8AF6266TAX?
All STM8AF6266TAX units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF6266TAX, 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 STM8AF6266TAX part is unused and in its original packaging.
Return procedure for STM8AF6266TAX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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