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STMicroelectronics STM8AF6226UAY
- Part No.:
- STM8AF6226UAY
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
STM8AF6226UAY.pdf
- Description:
- IC MCU 8BIT 8KB FLASH 32VFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:4,765
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Product details
Overview
STM8AF6226UAY from STMicroelectronics is an AEC-Q100 qualified automotive 8-bit microcontroller featuring a 16 MHz STM8A core, 8 Kbyte Flash memory with 20-year data retention at 55 °C, 640 byte true data EEPROM (300 kcycle endurance), 1 Kbyte RAM, 10-bit ADC with 7 muxed channels, LIN 2.2-compliant UART, SPI up to 8 Mbit/s, I²C up to 400 Kbit/s, and operation up to 150 °C in LQFP32 package - used in engine control modules and body electronics.
For engineers reviewing the STM8AF6226UAY datasheet, STM8AF6226UAY pinout, STM8AF6226UAY application, or STM8AF6226UAY equivalent, this page delivers verified technical context, validated pin functions, automotive-grade timing and power specifications, and real-world use cases for under-hood embedded control design.
Technical Context
The STM8AF6226UAY implements a Harvard-architecture STM8A core with 3-stage pipeline and extended instruction set, supporting nested interrupts across 32 vectors with up to 28 external interrupt sources on 7 vectors. Its clock system integrates user-trimmable 16 MHz RC and low-power 128 kHz RC oscillators plus crystal/resonator support with clock security monitoring.
Peripheral integration includes an advanced 16-bit TIM1 timer with dead-time insertion and complementary outputs, two additional 16-bit general-purpose timers (TIM5), one 8-bit basic timer (TIM6), auto-wakeup timer, independent/window watchdogs, and LINUART with automatic resynchronization - all operating within 3–5.5 V supply and qualified for automotive ambient temperatures up to 150 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8A 8-bit Harvard core with 3-stage pipeline and extended instruction set - enables deterministic real-time execution in safety-critical automotive firmware. |
| Max CPU Frequency | 16 MHz at VDD = 3.3–5.5 V - supports fast sensor sampling and LIN protocol timing without external PLL. |
| Flash Memory | 8 Kbyte program Flash with 20-year data retention at 55 °C after 1 kcycle - suitable for long-lifecycle vehicle ECUs requiring field updates. |
| Data EEPROM | 640 byte true data EEPROM with 300 kcycle endurance - stores calibration data, fault logs, and configuration parameters without external NV memory. |
| ADC Resolution | 10-bit SAR ADC with ±1 LSB INL/DNL, 7 muxed input channels + 1 internal reference channel - enables precise analog sensing of temperature, pressure, and battery voltage. |
| LIN Interface | LIN 2.2-compliant UART with master/slave modes and automatic resynchronization - eliminates need for external LIN transceiver in cost-sensitive sub-node applications. |
| Operating Temperature | −40 °C to +150 °C - certified for under-hood placement in engine management, transmission control, and HVAC actuators. |
| Supply Voltage Range | 3.0 V to 5.5 V - compatible with both 3.3 V and 5 V automotive power domains and tolerant of load-dump transients. |
Pinout & Package
LQFP32 (7 × 7 mm, 0.8 mm pitch) package with 28 I/O pins including 21 high-sink outputs, robust against current injection, and compliant with JEDEC MO-215 standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply (main) | Primary 3–5.5 V supply input; decoupled via external 100 nF capacitor per datasheet Section 10.3.1. |
| VSS | Ground reference | Digital ground return path; requires low-inductance connection to minimize noise coupling into ADC and timers. |
| NRST | Active-low reset input | Asynchronous reset pin with internal pull-up; accepts 1.2 V logic threshold and supports external reset supervisor ICs. |
| PA0–PA7 | Port A bidirectional I/O | 8-bit port with alternate functions including TIM1/2 channels, ADC inputs, SPI/I²C pins, and high-sink capability (up to 20 mA). |
| PB0–PB7 | Port B bidirectional I/O | 8-bit port supporting LINUART TX/RX, SPI SCK/MOSI/MISO, I²C SCL/SDA, and TIM5/6 channels - remappable via option bytes. |
| PC0–PC7 | Port C bidirectional I/O | 8-bit port with TIM1 complementary outputs, ADC trigger inputs, and wake-up capability - includes dedicated high-current sink outputs. |
| PD0–PD3 | Port D bidirectional I/O | 4-bit port with SWIM debug interface (PD0), beeper output (PD1), and additional ADC inputs - enables single-wire in-circuit programming and diagnostics. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for −40 °C to +150 °C operation with full electrical characterization - meets automotive ECU reliability requirements without derating. |
| True data EEPROM | 640 byte on-chip EEPROM with guaranteed 300 kwrite cycles - eliminates external serial EEPROM and reduces BOM count in LIN slave nodes. |
| Advanced TIM1 timer | 16-bit timer with 4 CAPCOM channels, 3 complementary outputs, and programmable dead-time insertion - directly drives 3-phase motor gate drivers without external logic. |
| LIN 2.2 UART | Hardware LIN controller with automatic baud-rate resynchronization and frame error detection - ensures robust communication over noisy vehicle wiring harnesses. |
| Low-power modes | Wait, auto-wakeup, and Halt modes with configurable clock gating - achieves sub-1 µA current in active halt mode at 25 °C for battery-backed modules. |
| Single-wire SWIM interface | On-chip debug interface using PD0 only - enables in-system programming and real-time debugging with minimal PCB footprint and no JTAG header. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Real-time monitoring of crankshaft position, throttle angle, and coolant temperature in gasoline direct injection systems. IC Role / Device Role / Timing Role: Primary MCU executing closed-loop fuel injection timing, spark advance calculation, and OBD-II diagnostics via LIN. Use Value: 16 MHz deterministic execution and 10-bit ADC with internal reference enable <±1° crank angle resolution and <±0.5 °C thermal accuracy at 150 °C ambient. |
Use Scenario: Centralized control of door locks, window lifters, interior lighting, and mirror adjustment in premium vehicles. IC Role / Device Role / Timing Role: LIN slave node coordinating with central gateway; manages local actuator drivers and switch debouncing. Use Value: Integrated LINUART with automatic resync tolerates >15% bus voltage ripple; 21 high-sink I/Os drive relays and LEDs directly without external drivers. |
| Transmission Control Unit (TCU) | HVAC Actuator Controller |
Use Scenario: Gear selection logic, solenoid valve timing, and torque converter clutch control in 6-speed automatic transmissions. IC Role / Device Role / Timing Role: Safety-relevant controller interfacing with CAN gateway via external transceiver while managing local PWM-driven solenoids. Use Value: TIM1's dead-time insertion prevents shoot-through in half-bridge solenoid drivers; AEC-Q100 Grade 0 ensures operation at transmission oil temperatures up to 150 °C. |
Use Scenario: Position feedback and motor control for blend-air, mode, and recirculation flaps in climate control systems. IC Role / Device Role / Timing Role: Dedicated actuator MCU reading potentiometer feedback, driving bipolar stepper motors, and reporting status over LIN. Use Value: 8 Kbyte Flash stores motor calibration curves; 640 byte EEPROM retains end-stop positions across 15+ year vehicle lifetime without backup power. |
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 |
|---|---|---|---|
| STM8AF6223UAY | 4 Kbyte Flash, same peripherals and package - lacks 4 Kbyte of program memory and associated EEPROM allocation. | Suitable for simpler LIN slaves with fixed firmware and no field update requirement. | Select when code size ≤3.5 Kbyte and EEPROM usage <320 byte; reduces cost without sacrificing I/O or timing capability. |
| RL78/F13-BS | Renesas RL78 core, 16 MHz max, 16 Kbyte Flash, 1.25 Kbyte RAM, but no integrated LIN PHY - requires external transceiver. | Used in higher-complexity body electronics where CAN coexistence and larger memory are needed. | Choose when migrating toward multi-protocol (CAN+LIN) designs or requiring >8 Kbyte code space; adds BOM cost and layout area. |
Compared with STM8AF6223UAY, the STM8AF6226UAY provides double Flash and EEPROM capacity for firmware updates and logging; versus RL78/F13-BS, it integrates LIN physical layer and reduces component count, though with smaller memory headroom.
Availability
STM8AF6226UAY is available at Aetrix Electronics and suitable for engine control units, transmission control modules, and HVAC actuator systems requiring stable component supply across automotive production lifecycles.
Supply support for STM8AF6226UAY 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.
The STM8AF series is ST's automotive-qualified 8-bit MCU product line, engineered specifically for cost-sensitive, high-reliability under-hood and body electronics applications demanding AEC-Q100 compliance and extended temperature operation.
FAQ
What is the maximum operating junction temperature for STM8AF6226UAY?
The device is rated for operation up to +150 °C ambient temperature and has a maximum junction temperature of +165 °C under specified thermal conditions (θJA = 40 °C/W, LQFP32). This is validated per AEC-Q100 Grade 0 test requirements and confirmed in Section 10.3 of DS9884 Rev 9.
Does STM8AF6226UAY support in-circuit debugging without a dedicated debug header?
Yes - it features the Single Wire Interface Module (SWIM) accessible via PD0 pin only, enabling full in-circuit programming, breakpoint setting, and register inspection using ST-LINK/V2 or compatible debuggers without JTAG/SWD headers or additional pins.
Can the internal 16 MHz RC oscillator meet LIN baud rate accuracy requirements?
No - the internal 16 MHz RC oscillator has ±1% initial tolerance and ±3% variation over temperature/voltage, exceeding LIN 2.2's ±1.5% baud rate error limit. External crystal (e.g., 8 MHz) or LIN-specific clock source is required for master-mode operation.
How many LIN nodes can be controlled using STM8AF6226UAY's hardware resources?
The device supports one LIN 2.2-compliant UART channel, enabling it to serve as either a master or slave node in a single LIN subnetwork. Multiple physical LIN buses require external transceivers and software-managed time-division multiplexing - not supported by hardware.
STM8AF6226UAY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-VFQFN Exposed Pad
- Series:
- STM8A
- Packaging:
- Tray
- Product Status:
- Not For New Designs
- 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:
- 28
- Program Memory Size:
- 8KB (8K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 640 x 8
- RAM Size:
- 1K x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 5.5V
- Data Converters:
- A/D 7x10b SAR
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AF6226UAY FAQ
1.How can I place an order for STM8AF6226UAY through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF6226UAY 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 STM8AF6226UAY reliable?
The price and inventory of STM8AF6226UAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF6226UAY is usually 5 days.
3.What payment methods are accepted for STM8AF6226UAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF6226UAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF6226UAY?
STM8AF6226UAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF6226UAY 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 STM8AF6226UAY?
For technical support, including STM8AF6226UAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF6226UAY requirements.
6.How does Aetrix verify that STM8AF6226UAY is sourced from the original manufacturer or authorized distributors?
All STM8AF6226UAY 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 STM8AF6226UAY meets industry standards.
7.What is the process for return or replacement of STM8AF6226UAY?
All STM8AF6226UAY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF6226UAY, 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 STM8AF6226UAY part is unused and in its original packaging.
Return procedure for STM8AF6226UAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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