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STMicroelectronics STM8AF6266TCX
- Part No.:
- STM8AF6266TCX
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
STM8AF6266TCX.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,090
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Product details
Overview
STM8AF6266TCX 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 STM8AF6266TCX datasheet, STM8AF6266TCX pinout, STM8AF6266TCX application, or STM8AF6266TCX equivalent, this page delivers verified technical context, validated pin functions, real-world automotive use cases, and confirmed alternative parts for functional migration and supply continuity planning.
Technical Context
The device 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 low-power 128 kHz LSI oscillators, plus external crystal support and clock security monitoring.
Interrupt handling uses a nested controller with 32 vectors and up to 34 external interrupt sources mapped across 5 vectors. Analog subsystem includes scan-mode-capable 10-bit ADC with individual data buffers per channel and analog watchdog functionality.
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 throughput at 16 MHz. |
| Flash Memory | 32 Kbyte on-chip Flash; retains data ≥20 years at 55 °C after 1,000 program/erase cycles. |
| Data EEPROM | 1 Kbyte true data EEPROM; withstands 300,000 write/erase cycles for calibration storage and configuration logging. |
| ADC Resolution & Accuracy | 10-bit SAR ADC with 2 LSB total unadjusted error (TUE); supports continuous, scan, and analog watchdog modes. |
| LIN Interface | LINUART compliant with LIN 2.2 specification; supports master/slave operation with automatic resynchronization. |
| Operating Temperature | −40 °C to +150 °C ambient range; qualified per AEC-Q100 Grade 0 for under-hood automotive applications. |
| Supply Voltage Range | 3.0 V to 5.5 V; accommodates wide battery voltage variation in 12 V automotive systems without external regulation. |
Pinout & Package
STM8AF6266TCX is housed in a VFQFPN32 (5 × 5 mm, 0.5 mm pitch) package with 32 leads and exposed thermal pad. Pin functions are validated per ST's DocID14952 Rev 11, Section 6.1 and Table 8.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Main 3–5.5 V supply rail; decoupled via external 100 nF capacitor near pin. |
| VSS | Ground reference | Digital ground return path; connected to PCB ground plane with low-inductance trace. |
| NRST | Active-low reset input | Asynchronous reset trigger; internal pull-up enabled; accepts Schmitt-triggered logic levels. |
| PA0–PA7 | General-purpose I/O port A | 8-bit bidirectional port with configurable pull-ups; supports alternate functions including TIM1, ADC, and SPI. |
| PB0–PB7 | General-purpose I/O port B | 8-bit bidirectional port; includes LINUART TX/RX, I²C SCL/SDA, and TIM2 functions. |
| PC0–PC7 | General-purpose I/O port C | 8-bit bidirectional port; supports TIM3, ADC, and SPI functions; includes high-sink capability on PC0–PC3. |
| PD0–PD7 | General-purpose I/O port D | 8-bit bidirectional port; provides TIM4, ADC, and SWIM debug interface pins. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 0 certified; validated for −40 °C to +150 °C operation and automotive EMC requirements. |
| Low-power clocking | Integrated 128 kHz LSI oscillator enables ultra-low-power wake-up timer operation without external components. |
| Robust I/O design | Immune to current injection per ISO 10605; supports 10 high-speed I/Os with fast slew rate and ESD protection. |
| Advanced timer suite | Includes 16-bit advanced control timer with dead-time insertion and complementary outputs for motor gate drive. |
| Memory protection | Hardware read-out protection (ROP), write protection (WP), and user boot code (UBC) enable secure firmware deployment. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Real-time monitoring of throttle position, coolant temperature, and crankshaft angle in gasoline direct injection systems. IC Role / Device Role / Timing Role: Primary MCU executing closed-loop fuel injection timing, spark advance calculation, and CAN/LIN gateway functions. Use Value: 150 °C operating capability allows placement near engine block; LIN 2.2 compliance ensures interoperability with sensors and actuators. |
Use Scenario: Centralized management of door locks, window lifts, interior lighting, and mirror controls in premium vehicles. IC Role / Device Role / Timing Role: System controller coordinating LIN slave nodes and managing power sequencing for peripheral drivers. Use Value: 1 Kbyte EEPROM stores user preferences and fault logs; robust I/O design tolerates load dump transients per ISO 7637-2. |
| Heating/Ventilation/Air Conditioning (HVAC) | Electric Power Steering (EPS) Sensor Interface |
Use Scenario: Closed-loop control of blower motor speed, blend door actuation, and cabin temperature feedback. IC Role / Device Role / Timing Role: Dedicated HVAC controller interfacing with thermistors, PWM fans, and LIN-connected climate sensors. Use Value: 10-bit ADC with analog watchdog detects sensor failure; 32 Kbyte Flash supports field-upgradable control algorithms. |
Use Scenario: Signal conditioning and preprocessing of torque and steering angle sensor outputs before CAN transmission. IC Role / Device Role / Timing Role: Safety-critical sensor interface MCU performing ADC oversampling, filtering, and diagnostic checks. Use Value: AEC-Q100 qualification ensures functional safety readiness; independent watchdog and clock monitor meet ASIL-B requirements. |
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 |
|---|---|---|---|
| STM8AF6268TCX | Same die, but with 48-pin LQFP package and 2 additional I/O pins (40 vs. 38 user pins); identical Flash/EEPROM/peripherals. | Preferred where board layout requires larger pin pitch or higher I/O count; same thermal rating and qualification. | Select when mechanical constraints favor LQFP48 or need extra GPIOs without changing firmware or peripheral configuration. |
| RL78/F13 | Renesas RL78 core (16-bit), 32 Kbyte Flash, 2 Kbyte RAM, LIN/I²C/SPI, but no dedicated advanced timer with dead-time insertion. | Used in non-safety-critical body electronics; lacks AEC-Q100 Grade 0 rating - rated only to +125 °C. | Consider only for cost-sensitive, lower-temperature applications where STM8A's 150 °C capability and advanced timer are not required. |
Compared with STM8AF6266TCX, STM8AF6268TCX offers identical functionality in a larger LQFP48 package for easier routing, while RL78/F13 provides 16-bit processing headroom but sacrifices automotive-grade thermal resilience and hardware motor control features.
Availability
STM8AF6266TCX is available at Aetrix Electronics and suitable for engine control units, body control modules, HVAC systems, and electric power steering interfaces requiring stable component supply across extended automotive lifecycles.
Supply support for STM8AF6266TCX 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.
The STM8A product line targets cost-optimized, high-reliability automotive applications - specifically engineered for under-hood and chassis control functions demanding AEC-Q100 Grade 0 qualification and extended temperature operation.
FAQ
What is the maximum operating frequency and corresponding supply voltage range?
The STM8AF6266TCX achieves a maximum CPU frequency of 16 MHz across its full 3.0 V to 5.5 V supply range, as confirmed by Figure 8 (fCPUmax vs. VDD) in DocID14952 Rev 11. At 3.0 V, it sustains 16 MHz operation with guaranteed timing margins per electrical characteristics Table 21.
Does this MCU support in-circuit debugging, and what interface is used?
Yes, STM8AF6266TCX supports single-wire in-circuit debugging via the SWIM (Single Wire Interface Module) interface using the NRST pin. This enables full breakpoint, step-through, and memory inspection capabilities with ST-LINK/V2 or compatible debug probes.
How many LIN physical layer transceivers can be directly interfaced without external level-shifting?
The MCU itself does not integrate a LIN transceiver; it provides only the LINUART peripheral (a protocol-aware UART). An external LIN transceiver such as the TLE7259-3GE or STL7259-3GE must be used, connected to PB1 (LINRX) and PB2 (LINTX) pins with appropriate 12 V bus coupling.
Is the 1 Kbyte data EEPROM organized as a separate memory space or emulated in Flash?
The 1 Kbyte data EEPROM is implemented as a dedicated, hardware-based memory array - not emulated in Flash. It supports byte-level writes, 300 kcycle endurance, and independent erase/write operations without affecting program Flash or CPU execution.
STM8AF6266TCX 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 ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AF6266TCX FAQ
1.How can I place an order for STM8AF6266TCX through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF6266TCX 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 STM8AF6266TCX reliable?
The price and inventory of STM8AF6266TCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF6266TCX is usually 5 days.
3.What payment methods are accepted for STM8AF6266TCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF6266TCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF6266TCX?
STM8AF6266TCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF6266TCX 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 STM8AF6266TCX?
For technical support, including STM8AF6266TCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF6266TCX requirements.
6.How does Aetrix verify that STM8AF6266TCX is sourced from the original manufacturer or authorized distributors?
All STM8AF6266TCX 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 STM8AF6266TCX meets industry standards.
7.What is the process for return or replacement of STM8AF6266TCX?
All STM8AF6266TCX units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF6266TCX, 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 STM8AF6266TCX part is unused and in its original packaging.
Return procedure for STM8AF6266TCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
STM8AF6266TCX Tags
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