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STMicroelectronics STM8AF6268TAY
- Part No.:
- STM8AF6268TAY
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
STM8AF6268TAY.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,943
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Product details
Overview
STM8AF6268TAY 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, dual 16-bit PWM timers, advanced control timer with dead-time insertion, and operates from 3 to 5.5 V in ambient temperatures up to 150 °C - deployed in engine control units and body electronics modules.
For engineers reviewing the STM8AF6268TAY datasheet, STM8AF6268TAY pinout, STM8AF6268TAY application, or STM8AF6268TAY equivalent, key selection criteria include AEC-Q100 Grade 0 qualification, VFQFPN32 (5×5 mm) package compatibility, LINUART master/slave resynchronization capability, 16 MHz CPU clock stability under automotive thermal stress, and on-chip 128 kHz LSI oscillator for low-power wake-up timing.
Technical Context
The STM8AF6268TAY implements a Harvard-architecture STM8A core with 3-stage pipeline and average 1.6 cycles/instruction throughput, delivering 10 MIPS at 16 MHz. Its clock system integrates user-trimmable 16 MHz HSI and 128 kHz LSI RC oscillators plus external crystal support, all monitored by a dedicated clock security system (CSS).
Interrupt handling uses a nested controller with 32 vectors and up to 34 external interrupt sources mapped across five priority levels. The analog subsystem includes a 10-bit ADC with individual data buffers per channel, scan mode, and analog watchdog - all operating within the full −40 to +150 °C automotive temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8A 8-bit Harvard core with 3-stage pipeline; enables deterministic real-time execution in safety-critical automotive firmware. |
| Max fCPU | 16 MHz at VDD = 3–5.5 V; supports deterministic timing for LIN frame generation and PWM edge alignment. |
| Flash Memory | 32 Kbyte program Flash with 20-year data retention at 55 °C after 1 kcycle; suitable for field-updatable ECU firmware storage. |
| Data EEPROM | 1 Kbyte true data EEPROM rated for 300 kwrite cycles; retains calibration data and fault logs without external backup. |
| ADC Resolution | 10-bit SAR ADC with ±2 LSB total unadjusted error (TUE); meets ASIL-B sensor signal acquisition requirements. |
| LIN Compliance | LIN 2.2 compliant UART with automatic resynchronization; eliminates need for external LIN transceiver in basic node applications. |
| Operating Temp | −40 to +150 °C ambient; validated for under-hood deployment in powertrain and transmission control modules. |
| AEC-Q100 Grade | Grade 0 qualification per Rev G; certified for automotive applications requiring highest reliability and lifetime validation. |
Pinout & Package
STM8AF6268TAY is housed in a VFQFPN32 (5 × 5 mm, 0.5 mm pitch) thermally enhanced package with exposed thermal pad, optimized for high-temperature automotive PCB layouts and automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Primary 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; requires low-inductance routing to minimize noise coupling into ADC and timers. |
| NRST | Active-low reset input | Asynchronous reset pin with internal pull-up; accepts external RC network for power-on reset timing compliance. |
| PA0–PA7 | General-purpose I/O port A | 8-bit bidirectional port with HS capability; supports alternate functions including TIM1/2 channels and ADC inputs. |
| PC0–PC7 | General-purpose I/O port C | 8-bit port supporting LINUART TX/RX, SPI SCK/MOSI/MISO, and I²C SCL/SDA multiplexing. |
| PD0–PD7 | General-purpose I/O port D | 8-bit port with 10 high-speed pins; used for PWM outputs, CAPCOM inputs, and external interrupt sources. |
| VCAP | Internal voltage regulator capacitor | Connects external 1 µF ceramic capacitor to stabilize core voltage; mandatory for stable 16 MHz operation. |
Key Features
| Feature | Design Value |
|---|---|
| Advanced Control Timer (TIM1) | 16-bit timer with 4 CAPCOM channels, 3 complementary outputs, and programmable dead-time insertion - enables precise 3-phase motor gate drive without external logic. |
| Auto-wakeup Timer | Low-power 8-bit timer with independent 128 kHz LSI clock source - allows periodic wake-up from Halt mode every 1–65535 ms without CPU intervention. |
| SWIM Debug Interface | Single-wire debug interface using NRST pin; supports full in-circuit programming and real-time variable monitoring with minimal PCB footprint. |
| Flash Read-Out Protection (ROP) | Configurable ROP level (Level 1/2) prevents unauthorized firmware extraction via SWIM - satisfies OEM IP protection requirements. |
| I/O Current Injection Immunity | Robust I/O design withstands >100 mA current injection per pin - ensures functional safety in noisy under-hood environments. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Real-time spark timing calculation, fuel injection pulse width modulation, and knock sensor signal conditioning in gasoline engines. IC Role / Device Role / Timing Role: Primary MCU executing closed-loop combustion control algorithms with sub-microsecond timer resolution and LIN-based sensor feedback. Use Value: Integrated 16-bit advanced control timer and 10-bit ADC eliminate external timing ICs and signal conditioners, reducing BOM count by ≥3 components. |
Use Scenario: Centralized management of door locks, window lifts, interior lighting dimming, and mirror positioning in premium vehicles. IC Role / Device Role / Timing Role: LIN master node coordinating distributed slave nodes (e.g., seat controllers, mirror ECUs) via hardware-resynchronized frames. Use Value: On-chip LINUART with automatic resynchronization reduces bus error rate by >90% compared to software-emulated LIN stacks. |
| Transmission Control Unit (TCU) | Heating/Ventilation Control |
Use Scenario: Gear shift solenoid actuation timing, clutch pressure regulation, and CAN/LIN gateway functionality in automatic transmissions. IC Role / Device Role / Timing Role: Safety-critical timing controller generating synchronized PWM outputs for proportional solenoids while monitoring hydraulic pressure ADC inputs. Use Value: 150 °C operating capability enables direct mounting on transmission housing, eliminating remote mounting and associated harness losses. |
Use Scenario: HVAC blower motor speed control, cabin temperature sensing, and air flap actuator positioning in climate control systems. IC Role / Device Role / Timing Role: Dual-role device acting as LIN slave for dashboard commands and ADC-based NTC thermistor reader for multi-zone temperature feedback. Use Value: 1 Kbyte data EEPROM stores factory-calibrated PID coefficients and seasonal offset tables, enabling adaptive thermal response without reprogramming. |
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 VFQFPN32 package and pinout, but with 16 Kbyte Flash and 512 byte EEPROM; identical peripheral set and AEC-Q100 Grade 0 rating. | Targeted at cost-sensitive body electronics where firmware size <16 KB and calibration data volume <512 bytes suffice. | Select when firmware footprint and EEPROM usage are confirmed ≤50% of STM8AF6268TAY capacity to reduce unit cost without redesign. |
| RL78/F13-GB | Renesas RL78 core (16-bit), 32 Kbyte Flash, 2 Kbyte RAM, but only 8-bit ADC (±3 LSB); no native LIN 2.2 support - requires external transceiver and software stack. | Used in Japanese OEM BCMs where RL78 toolchain ecosystem and CAN+LIN hybrid networking are prioritized over pure LIN integration. | Choose only if existing RL78 software infrastructure and dual-CAN/LIN gateway requirements outweigh STM8AF6268TAY's single-chip LIN advantage. |
Compared with STM8AF6266TAY, the STM8AF6268TAY provides double Flash and EEPROM capacity for future firmware updates and extended diagnostic logging; versus RL78/F13-GB, it delivers lower system-level BOM cost and higher LIN protocol reliability through hardware-accelerated frame handling.
Availability
STM8AF6268TAY is available at Aetrix Electronics and suitable for engine control units, body control modules, transmission control units, and HVAC systems requiring stable component supply across extended automotive product lifecycles.
Supply support for STM8AF6268TAY 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-optimized, high-reliability embedded control in powertrain, chassis, and body electronics - emphasizing AEC-Q100 compliance, extended temperature operation, and integrated LIN/CAN peripherals.
FAQ
What is the maximum junction temperature specification for STM8AF6268TAY?
The device is qualified for operation up to +150 °C ambient temperature and has a maximum junction temperature of +165 °C under continuous operation with proper PCB thermal design. Thermal resistance θJA is 42 °C/W for the VFQFPN32 package with standard 2-layer board layout and 1-in² copper pour beneath the thermal pad.
Does STM8AF6268TAY support in-application programming (IAP) of Flash memory?
Yes, the device supports full in-application programming of Flash memory via its built-in bootloader and SWIM interface. Users can implement field firmware updates by executing code from RAM while reprogramming designated Flash sectors, with hardware write protection and option byte lock mechanisms preventing accidental corruption.
How is LIN 2.2 compliance implemented in the STM8AF6268TAY hardware?
LIN 2.2 compliance is achieved through dedicated LINUART hardware that handles baud rate auto-synchronization, checksum calculation (classic/enhanced), frame header detection, and response timeout monitoring - all without CPU intervention. The module supports both master and slave modes and tolerates ±15% bus clock deviation per LIN specification.
What is the purpose of the VCAP pin and what capacitor value is required?
The VCAP pin connects to the output of the internal voltage regulator supplying the CPU core. A 1 µF X7R ceramic capacitor must be placed between VCAP and VSS, located within 5 mm of the pin, to ensure stable core voltage during dynamic load changes - omission causes unpredictable resets or instruction corruption above 8 MHz.
STM8AF6268TAY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 48-LQFP
- Series:
- STM8A
- Packaging:
- Tray
- 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:
STM8AF6268TAY FAQ
1.How can I place an order for STM8AF6268TAY through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF6268TAY 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 STM8AF6268TAY reliable?
The price and inventory of STM8AF6268TAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF6268TAY is usually 5 days.
3.What payment methods are accepted for STM8AF6268TAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF6268TAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF6268TAY?
STM8AF6268TAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF6268TAY 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 STM8AF6268TAY?
For technical support, including STM8AF6268TAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF6268TAY requirements.
6.How does Aetrix verify that STM8AF6268TAY is sourced from the original manufacturer or authorized distributors?
All STM8AF6268TAY 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 STM8AF6268TAY meets industry standards.
7.What is the process for return or replacement of STM8AF6268TAY?
All STM8AF6268TAY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF6268TAY, 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 STM8AF6268TAY part is unused and in its original packaging.
Return procedure for STM8AF6268TAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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