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STMicroelectronics STM8AF6268TAX
- Part No.:
- STM8AF6268TAX
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
STM8AF6268TAX.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,010
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Product details
Overview
STM8AF6268TAX 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. It supports LIN 2.2-compliant communication, SPI up to 8 Mbit/s, I²C up to 400 Kbit/s, and operates across -40 to 150 °C for engine control unit (ECU) sensor interface applications.
For engineers reviewing the STM8AF6268TAX datasheet, STM8AF6268TAX pinout, STM8AF6268TAX application, or STM8AF6268TAX equivalent, this page delivers verified technical context, validated pin functions, automotive-grade timing and power specifications, and real-world use cases in high-temperature vehicle subsystems.
Technical Context
The STM8AF6268TAX implements a Harvard-architecture STM8A CPU with 3-stage pipeline and 1.6-cycle/instruction average execution, 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 interrupts mapped across 5 vectors. Analog functionality centers on a 10-bit ADC with scan mode, analog watchdog, and individual channel buffers - all qualified for operation up to 150 °C ambient.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8A 8-bit Harvard core with 3-stage pipeline; enables deterministic real-time response in safety-critical automotive firmware. |
| Max fCPU | 16 MHz at VDD = 3.3–5.5 V; supports time-critical LIN frame generation and ADC sampling without external clocking. |
| Flash Memory | 32 Kbyte program Flash with 20-year data retention at 55 °C after 1 kcycle; suitable for long-lifecycle ECU firmware storage. |
| Data EEPROM | 1 Kbyte true data EEPROM with 300 kcycle endurance; retains calibration data and fault logs across vehicle service intervals. |
| ADC Resolution | 10-bit with 2 LSB total unadjusted error (TUE); provides ±0.2% measurement accuracy for throttle position or coolant temperature sensing. |
| Operating Temperature | -40 to +150 °C ambient; certified for under-hood placement in engine management and transmission control modules. |
| LIN Compliance | LIN 2.2 master/slave with automatic resynchronization; eliminates need for external LIN transceiver in cost-sensitive body electronics nodes. |
Pinout & Package
STM8AF6268TAX 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 3.3–5.5 V supply rail; decoupled via external 100 nF capacitor to stabilize internal regulators during load transients. |
| VSS | Ground reference | Digital ground plane connection; separate analog ground not required due to integrated noise-immune ADC design. |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; accepts 1.2–5.5 V logic levels and supports external watchdog or power-on reset circuits. |
| PA0–PA7 | General-purpose I/O port A | Up to 8 pins configurable as digital I/O, ADC inputs, or timer capture/compare channels; HS I/O capable of 10 mA sink/source. |
| PB0–PB7 | General-purpose I/O port B | Includes LINUART TX/RX, SPI SCK/MOSI/MISO, and I²C SCL/SDA alternate functions; supports remapping for board layout flexibility. |
| PC0–PC7 | General-purpose I/O port C | Features advanced timer complementary outputs with dead-time insertion; used for motor gate drive signal conditioning in fan or pump controllers. |
| PD0–PD7 | General-purpose I/O port D | Includes auto-wakeup timer input and beeper output; enables low-power periodic wake-up for battery-supplied sensors without external RTC. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for -40 to +150 °C operation with full electrical characterization; meets automotive reliability requirements without derating. |
| Integrated LIN 2.2 UART | Eliminates external LIN transceiver in body control modules; reduces BOM count and PCB area while maintaining bus-level fault tolerance. |
| Advanced control timer (TIM1) | 16-bit timer with 4 CAPCOM channels, 3 complementary outputs, and programmable dead-time; enables precise 3-phase motor commutation in HVAC blower systems. |
| True data EEPROM | 1 Kbyte nonvolatile memory with 300 kcycle endurance and byte-level erase; stores adaptive learning parameters for idle speed control without Flash wear penalties. |
| Low-power operating modes | Halt, Active-halt, Wait, and Auto-wakeup modes with selective peripheral clock gating; achieves sub-1 µA standby current for always-on vehicle network nodes. |
Applications
| Engine Control Unit (ECU) Sensor Interface | Body Control Module (BCM) Lighting Control |
|---|---|
Use Scenario: Monitoring throttle position, coolant temperature, and intake air pressure in gasoline/diesel engine management systems. IC Role / Device Role / Timing Role: Primary sensor signal acquisition and preprocessing MCU; executes closed-loop fuel injection timing with sub-10 µs interrupt latency. Use Value: 10-bit ADC with analog watchdog ensures reliable detection of out-of-range sensor faults before engine damage occurs. |
Use Scenario: PWM dimming and fault reporting for LED headlamps, tail lamps, and interior lighting in modern vehicle platforms. IC Role / Device Role / Timing Role: Dedicated lighting controller managing up to 8 independent LED strings via TIM1 complementary outputs and dead-time insertion. Use Value: Integrated 16-bit advanced timer eliminates external gate driver ICs and reduces thermal stress on LED drivers during PWM transitions. |
| Transmission Control Unit (TCU) Solenoid Driver | HVAC Blower Motor Controller |
Use Scenario: Closed-loop pressure regulation using PWM-driven solenoid valves in automatic transmission hydraulic systems. IC Role / Device Role / Timing Role: Real-time solenoid actuation controller with LIN-based diagnostics and current-sense feedback integration. Use Value: LIN 2.2 slave mode enables direct communication with main TCU over shared vehicle bus, reducing wiring harness complexity. |
Use Scenario: Variable-speed control of brushless DC (BLDC) blowers in automotive climate systems with thermal protection. IC Role / Device Role / Timing Role: Motor commutation controller using TIM1's 3 complementary outputs and dead-time insertion for safe high-side/low-side switching. Use Value: 150 °C ambient rating allows direct mounting near heater core, eliminating remote controller placement and signal integrity losses. |
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 |
|---|---|---|---|
| STM8AF6266TAY | Same core and peripherals but with 24 Kbyte Flash and 0.5 Kbyte EEPROM; VFQFPN32 package with identical pinout. | Suitable for lower-complexity ECUs where firmware size and data logging depth are reduced. | Select when Flash and EEPROM requirements are ≤75% of STM8AF6268TAX capacity to reduce cost without redesign. |
| RL78/F13-CDL | Renesas RL78 core; 32 Kbyte Flash, 2 Kbyte RAM, but no integrated LIN PHY - requires external transceiver. | Used in Japanese OEM platforms with legacy RL78 toolchain and IAR compiler dependencies. | Choose only if existing software investment in RL78 ecosystem outweighs added BOM cost and board space for external LIN transceiver. |
Compared with STM8AF6268TAX, STM8AF6266TAY offers identical footprint and peripheral set at lower memory density, while RL78/F13-CDL trades integrated LIN for broader compiler support but increases system-level component count and thermal footprint.
Availability
STM8AF6268TAX is available at Aetrix Electronics and suitable for engine control units, body control modules, transmission control units, and HVAC blower motor controllers requiring stable component supply across extended automotive lifecycles.
Supply support for STM8AF6268TAX 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 management ICs, sensors, and automotive-grade silicon for industrial and transportation markets.
The STM8A automotive microcontroller product line targets cost-sensitive, high-reliability engine, chassis, and body electronics applications - emphasizing AEC-Q100 compliance, extended temperature operation, and integrated communication peripherals to reduce system-level complexity.
FAQ
Is STM8AF6268TAX pin-compatible with other STM8AF62xx variants?
Yes - STM8AF6268TAX shares identical VFQFPN32 pinout with STM8AF6266TAY and STM8AF6248TAY. All three support the same peripheral remapping and I/O configuration registers, enabling hardware reuse across firmware variants with different Flash/EEPROM capacities.
Does STM8AF6268TAX require an external LIN transceiver?
No - it integrates a LIN 2.2-compliant UART with automatic resynchronization and bus-level error detection. Only a single external LIN physical layer transceiver (e.g., TLE7259-3GE) is needed for bus termination and voltage level translation to the 12 V vehicle network.
What debug interface does STM8AF6268TAX support?
It uses the Single Wire Interface Module (SWIM), a 2-pin (SWIM and RST) debug interface supporting full-speed programming, real-time variable inspection, and breakpoint debugging via ST-LINK/V2 or compatible emulators - no JTAG header required.
Can STM8AF6268TAX operate reliably at 150 °C junction temperature?
Yes - its AEC-Q100 Grade 0 qualification guarantees full electrical performance from -40 to +150 °C ambient. Thermal design must maintain junction temperature ≤150 °C using the VFQFPN32 exposed pad and appropriate PCB copper pour per ST's AN4215 layout guidelines.
STM8AF6268TAX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 48-LQFP
- Series:
- STM8A
- Packaging:
- Tape & Reel (TR)
- 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:
- 38
- 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 10x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AF6268TAX FAQ
1.How can I place an order for STM8AF6268TAX through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF6268TAX 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 STM8AF6268TAX reliable?
The price and inventory of STM8AF6268TAX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF6268TAX is usually 5 days.
3.What payment methods are accepted for STM8AF6268TAX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF6268TAX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF6268TAX?
STM8AF6268TAX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF6268TAX 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 STM8AF6268TAX?
For technical support, including STM8AF6268TAX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF6268TAX requirements.
6.How does Aetrix verify that STM8AF6268TAX is sourced from the original manufacturer or authorized distributors?
All STM8AF6268TAX 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 STM8AF6268TAX meets industry standards.
7.What is the process for return or replacement of STM8AF6268TAX?
All STM8AF6268TAX units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF6268TAX, 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 STM8AF6268TAX part is unused and in its original packaging.
Return procedure for STM8AF6268TAX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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