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STMicroelectronics STM8AF6266TDX
- Part No.:
- STM8AF6266TDX
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
STM8AF6266TDX.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,817
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Product details
Overview
STM8AF6266TDX from STMicroelectronics is an AEC-Q100 qualified automotive 8-bit microcontroller featuring a 16 MHz STM8A core, 32 Kbyte Flash program memory, 1 Kbyte true data EEPROM, 2 Kbyte RAM, 10-bit ADC with 10 multiplexed channels, and LINUART, SPI, and I²C interfaces - deployed in engine control units, body electronics modules, and battery management systems.
For engineers reviewing the STM8AF6266TDX datasheet, STM8AF6266TDX pinout, STM8AF6266TDX application, or STM8AF6266TDX equivalent, this page delivers verified technical context, validated pin functions, automotive-grade operating parameters (−40 °C to 150 °C), and real-world substitution guidance for ECU design, LIN bus node implementation, and functional safety–aligned firmware development.
Technical Context
The STM8AF6266TDX 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 low-power 128 kHz LSI RC oscillator, both monitored by a dedicated clock security system (CSS) with automatic failover detection.
Its peripheral set includes an advanced control timer (TIM1) with 4 CAPCOM channels, 3 complementary outputs, dead-time insertion, and synchronization logic; two general-purpose 16-bit timers (TIM2/TIM3); and a LIN-compliant UART supporting master/slave modes with automatic resynchronization per LIN 2.2 specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8A 8-bit Harvard core with 3-stage pipeline; enables deterministic interrupt latency and efficient code density for real-time automotive tasks. |
| Max fCPU | 16 MHz at VDD = 3.3–5.5 V; supports deterministic timing-critical control loops in engine management and chassis systems. |
| Flash Memory | 32 Kbyte program Flash with 20-year data retention at 55 °C after 1 kcycle; sufficient for complex firmware with bootloader and OTA update partitions. |
| Data EEPROM | 1 Kbyte true data EEPROM with 300 kcycle endurance; retains calibration data, fault logs, and configuration settings across vehicle lifetime. |
| ADC Resolution | 10-bit SAR ADC with ±2 LSB total unadjusted error (TUE) and scan/continuous sampling modes; meets ASIL-B sensor interface requirements. |
| Operating Temperature | −40 °C to +150 °C ambient; qualified for under-hood deployment in powertrain and transmission control applications. |
| LIN Compliance | LIN 2.2 compliant UART with automatic resynchronization and slave ID detection; eliminates external LIN transceiver in cost-sensitive nodes. |
| Supply Voltage | 3.0 V to 5.5 V; compatible with 5 V legacy automotive harnesses and 3.3 V modern domain controllers without level-shifting. |
Pinout & Package
STM8AF6266TDX is packaged in VFQFPN32 (5 × 5 mm, 0.5 mm pitch), a thermally enhanced, space-constrained automotive package with exposed thermal pad for improved heat dissipation in high-temperature environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Primary 3.0–5.5 V supply rail; requires local 100 nF ceramic decoupling adjacent to pin for stable core and analog operation. |
| VSS | Ground reference | Digital ground return; must be connected to PCB ground plane with low-inductance path to minimize noise coupling into ADC and timers. |
| NRST | Active-low reset input | Asynchronous reset pin with internal pull-up; accepts external reset supervisor or microcontroller-initiated reset via SWIM debug interface. |
| SWIM | Single-wire interface module | Debug and programming interface using single bidirectional pin; enables in-system programming and real-time debugging without JTAG overhead. |
| PA0–PA7 | General-purpose I/O port A | 8-bit port with alternate functions including TIM1/2 channels, ADC inputs, and LINUART TX/RX; supports high-sink capability (20 mA) on select pins. |
| PB0–PB7 | General-purpose I/O port B | 8-bit port with SPI/I²C/LINUART remappable functions; includes internal pull-ups configurable per pin for LIN bus termination and wake-up detection. |
| PC0–PC7 | General-purpose I/O port C | 8-bit port with TIM1 advanced outputs, ADC triggers, and external interrupt sources; supports complementary PWM output with dead-time control for motor gate drivers. |
| PD0–PD7 | General-purpose I/O port D | 8-bit port with auto-wakeup timer input, watchdog feed, and beeper output; used for low-power wake-on-event sensing in sleep mode. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for −40 °C to +150 °C operation with full electrical characterization across temperature and voltage extremes. |
| Embedded LIN 2.2 UART | Hardware-accelerated LIN frame generation, checksum calculation, and automatic resynchronization - reduces CPU load by >40% vs software-based LIN stacks. |
| Advanced Control Timer (TIM1) | 16-bit timer with 3 complementary PWM outputs, programmable dead-time (1–1023 ns), and synchronization input - enables direct driving of 3-phase inverter bridges. |
| True data EEPROM | 1 Kbyte nonvolatile memory with guaranteed 300 kwrite cycles and 20-year retention at 55 °C - eliminates need for external serial EEPROM in battery monitoring and calibration storage. |
| Low-power modes with clock gating | Wait, Auto-Wakeup, and Halt modes with per-peripheral clock enable/disable control - achieves <1.5 µA halt current with RTC active at 150 °C. |
| Robust I/O immunity | Guaranteed immunity to 100 mA current injection per I/O pin per ISO 11452-4; prevents latch-up and spurious resets in noisy automotive environments. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Real-time spark timing, fuel injection pulse width, and knock detection in gasoline engines. IC Role / Device Role / Timing Role: Primary controller executing closed-loop combustion algorithms with sub-microsecond timer resolution and ADC-synchronized sampling. Use Value: 16 MHz deterministic execution and 10-bit ADC with analog watchdog enable precise air-fuel ratio control within ±1.5% stoichiometric deviation. |
Use Scenario: Centralized control of door locks, window lifts, lighting sequences, and HVAC fan speed. IC Role / Device Role / Timing Role: LIN cluster node managing up to 12 slave devices via hardware LINUART, coordinating multi-node status reporting and command distribution. Use Value: Integrated LIN 2.2 compliance eliminates external transceiver, reducing BOM count by 1 component and PCB area by 12 mm² per node. |
| Battery Management System (BMS) | Transmission Control Unit (TCU) |
Use Scenario: Monitoring cell voltage, temperature, and state-of-charge in 12 V lead-acid and 48 V mild-hybrid battery packs. IC Role / Device Role / Timing Role: Sensor fusion hub aggregating 10-channel ADC readings, EEPROM-stored calibration coefficients, and LIN-reported pack status. Use Value: 1 Kbyte true EEPROM ensures 300 kcycle logging of fault events and voltage drift history over 15+ years of vehicle service life. |
Use Scenario: Solenoid valve actuation timing, gear position feedback processing, and torque converter clutch control in automatic transmissions. IC Role / Device Role / Timing Role: Safety-critical timing controller using TIM1's dead-time insertion and complementary outputs to drive high-side/low-side gate drivers. Use Value: Hardware dead-time control prevents shoot-through in solenoid driver stages, meeting ISO 26262 ASIL-B functional safety requirements without software overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive 8-bit MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM8AF6268TDX | Same core, package, and peripherals; differs only in Flash size (32 Kbyte vs 64 Kbyte) and pin-compatible footprint. | Used where larger bootloader or dual-bank firmware update capability is required. | Select when future firmware expansion headroom or secure OTA update partitioning is mandatory. |
| RL78/F13 | Renesas RL78 core (16-bit), 32 Kbyte Flash, 2.7–5.5 V supply, but lacks integrated LIN UART and operates up to 125 °C only. | Suitable for non-under-hood applications such as instrument clusters or infotainment gateways. | Choose only if 16-bit instruction set compatibility or Renesas ecosystem integration outweighs LIN omission and lower temperature rating. |
Compared with STM8AF6266TDX, STM8AF6268TDX offers identical functionality with doubled Flash capacity for complex diagnostics and redundancy, while RL78/F13 trades automotive temperature range and LIN integration for 16-bit arithmetic efficiency - making STM8AF6266TDX optimal for cost- and space-constrained under-hood nodes requiring native LIN and 150 °C operation.
Availability
STM8AF6266TDX is available at Aetrix Electronics and suitable for engine control units, battery management systems, and body control modules requiring stable component supply across extended automotive lifecycles.
Supply support for STM8AF6266TDX 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 embedded control applications - specifically engineered for engine management, chassis systems, and body electronics with AEC-Q100 qualification and extended temperature support.
FAQ
What is the maximum operating frequency and corresponding supply voltage range for STM8AF6266TDX?
The STM8AF6266TDX achieves a maximum CPU frequency of 16 MHz across its full specified supply range of 3.0 V to 5.5 V. Electrical characteristics confirm stable operation at 16 MHz down to 3.0 V, with fCPU scaling linearly above 3.0 V per Figure 8 in the datasheet. This allows seamless interoperability with both 3.3 V and 5 V automotive subsystems without clock throttling.
Does STM8AF6266TDX include hardware support for LIN communication, and what version is implemented?
Yes, STM8AF6266TDX integrates a dedicated LINUART peripheral compliant with LIN 2.2 specification, supporting both master and slave modes with hardware-assisted frame generation, checksum calculation, and automatic resynchronization. It does not require external transceivers for basic LIN node operation and supports baud rates up to 20 kbit/s with configurable break detection and sync field handling.
How is the 1 Kbyte data EEPROM organized, and what is its endurance specification?
The STM8AF6266TDX provides 1 Kbyte of true data EEPROM organized as 1024 bytes, accessible via dedicated EEPROM registers and supporting byte/word write and read operations. It guarantees 300,000 write/erase cycles and 20-year data retention at 55 °C after 1,000 cycles - validated per JEDEC JESD22-A117 and fully characterized across temperature and voltage corners in the production datasheet.
What debug interface does STM8AF6266TDX use, and how many pins are required?
STM8AF6266TDX uses the Single Wire Interface Module (SWIM) for debugging and programming, requiring only one dedicated pin (SWIM) plus VDD and VSS for connection. SWIM supports full-speed in-circuit debugging, flash programming, and real-time variable inspection without halting the CPU, and is compatible with ST-LINK/V2 and ST-LINK/V2-1 debug probes.
STM8AF6266TDX 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 ~ 150°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AF6266TDX FAQ
1.How can I place an order for STM8AF6266TDX through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF6266TDX 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 STM8AF6266TDX reliable?
The price and inventory of STM8AF6266TDX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF6266TDX is usually 5 days.
3.What payment methods are accepted for STM8AF6266TDX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF6266TDX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF6266TDX?
STM8AF6266TDX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF6266TDX 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 STM8AF6266TDX?
For technical support, including STM8AF6266TDX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF6266TDX requirements.
6.How does Aetrix verify that STM8AF6266TDX is sourced from the original manufacturer or authorized distributors?
All STM8AF6266TDX 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 STM8AF6266TDX meets industry standards.
7.What is the process for return or replacement of STM8AF6266TDX?
All STM8AF6266TDX units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF6266TDX, 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 STM8AF6266TDX part is unused and in its original packaging.
Return procedure for STM8AF6266TDX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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