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STMicroelectronics STM8AF6246UAY
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- Part No.:
- STM8AF6246UAY
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
STM8AF6246UAY.pdf
- Description:
- IC MCU 8BIT 16KB FLASH 32VFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:1,096
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Product details
Overview
STM8AF6246UAY from STMicroelectronics is an AEC-Q100 qualified automotive 8-bit microcontroller featuring a 16 MHz STM8A core, 16 Kbyte Flash program memory, 1 Kbyte true data EEPROM, and integrated LINUART, SPI, I²C, and 10-bit ADC. It operates across -40 °C to 150 °C and targets engine control units, body electronics, and LIN-based sensor nodes.
For engineers reviewing the STM8AF6246UAY datasheet, STM8AF6246UAY pinout, STM8AF6246UAY application, or STM8AF6246UAY equivalent, key selection criteria include automotive temperature grade (150 °C), LIN 2.2 compliance with automatic resynchronization, 300 kcycle EEPROM endurance, and VFQFPN32 (5×5 mm) package compatibility with space-constrained under-hood modules.
Technical Context
The STM8AF6246UAY implements a Harvard-architecture STM8A CPU with 3-stage pipeline and 1.6 cycles/instruction average, delivering 10 MIPS at 16 MHz. Its clock system integrates user-trimmable 16 MHz HSI and 128 kHz LSI 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 interrupts mapped across 5 priority levels. The analog subsystem includes a 10-bit ADC with 2 LSB TUE accuracy, scan mode, and analog watchdog - directly supporting closed-loop feedback in motor control and battery monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8A 8-bit Harvard CPU with 3-stage pipeline; enables deterministic real-time response for safety-critical automotive tasks. |
| Max fCPU | 16 MHz at VDD = 3.3–5.5 V; supports time-critical LIN frame timing and PWM generation without external clocking. |
| Flash Memory | 16 Kbyte with 20-year data retention at 55 °C after 1 kcycle; sufficient for bootloader + application firmware in ECU designs. |
| Data EEPROM | 1 Kbyte true EEPROM with 300 kcycle endurance; stores calibration data, fault logs, and configuration parameters across vehicle lifetime. |
| ADC Resolution | 10-bit with 2 LSB total unadjusted error (TUE); meets precision requirements for throttle position and coolant temperature sensing. |
| LIN Interface | LIN 2.2-compliant UART with master/slave modes and automatic resynchronization; eliminates need for external LIN transceiver in slave-node applications. |
| Operating Temp | -40 °C to +150 °C ambient; validated for under-hood placement in engine management and transmission control modules. |
| Supply Voltage | 3.0 V to 5.5 V; compatible with both 3.3 V and 5 V automotive power domains without level-shifting. |
Pinout & Package
STM8AF6246UAY is housed in a VFQFPN32 (5 × 5 mm, 0.5 mm pitch) thermally enhanced package optimized for high-temperature automotive PCB layouts. The 32-pin layout supports full peripheral access while minimizing board area and thermal resistance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Primary 3.0–5.5 V supply rail; decoupled via external 100 nF capacitor per VDD pin for noise immunity in noisy engine environments. |
| VSS | Ground reference | Dedicated ground pins reduce ground bounce during high-speed I/O switching and ADC sampling. |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; accepts 1.2–5.5 V logic; supports external watchdog or power-on reset circuitry. |
| PA0–PA7 | General-purpose I/O port A | 8-bit bidirectional port with HS capability; configurable as LINUART TX/RX, ADC inputs, or timer capture/compare channels. |
| PB0–PB7 | General-purpose I/O port B | 8-bit port supporting SPI SCK/MOSI/MISO and I²C SCL/SDA; includes internal pull-ups for open-drain bus operation. |
| PC0–PC7 | General-purpose I/O port C | 8-bit port with remappable alternate functions; used for advanced timer complementary outputs and dead-time insertion control. |
| PD0–PD7 | General-purpose I/O port D | 8-bit port supporting auto-wakeup timer input and beeper output; enables low-power wake-on-event functionality. |
| VCAP | Capacitor connection for internal regulator | Requires 1 µF ceramic capacitor to stabilize internal voltage regulator; critical for stable operation above 125 °C. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for 150 °C operation and automotive stress testing (HTOL, TC, UHAST), enabling use in engine bay ECUs without derating. |
| Integrated LIN 2.2 UART | Eliminates external LIN transceiver in slave nodes; supports automatic resynchronization to tolerate bus jitter up to ±15%. |
| Advanced control timer (TIM1) | 16-bit timer with 4 CAPCOM channels, 3 complementary outputs, and hardware dead-time insertion - essential for 3-phase motor gate drive. |
| User-trimmable 16 MHz RC oscillator | ±2% accuracy over temperature/voltage; reduces BOM cost by removing external crystal while maintaining LIN baud rate stability. |
| True data EEPROM (1 Kbyte) | 300 kcycle endurance and 20-year data retention at 55 °C; stores adaptive learning values and diagnostic trouble codes without external memory. |
| Low-power operating modes | Halt mode consumes <1 µA at 25 °C; wait/auto-wakeup modes enable event-driven operation with sub-10 µs wake latency for responsive sensor polling. |
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 fuel injection timing, spark advance calculation, and OBD-II diagnostics via LIN. Use Value: 150 °C rating allows direct mounting near intake manifold; 10-bit ADC with analog watchdog ensures reliable sensor signal integrity under thermal stress. |
Use Scenario: Centralized control of door locks, window lifts, lighting, and HVAC actuators in premium vehicle platforms. IC Role / Device Role / Timing Role: LIN slave node coordinating with master BCM MCU; handles local actuator PWM and switch debouncing. Use Value: Integrated LINUART and 38-pin I/O count eliminate external transceivers and GPIO expanders, reducing PCB layer count and assembly cost. |
| Electric Power Steering (EPS) Sensor Node | Transmission Control Unit (TCU) Subsystem |
Use Scenario: Torque and steering angle sensing with fail-safe reporting over LIN to main EPS controller. IC Role / Device Role / Timing Role: Dedicated sensor interface MCU performing analog signal conditioning, filtering, and LIN frame formatting. Use Value: 2 LSB TUE ADC accuracy meets ASIL-B functional safety requirements for torque measurement; robust I/O design prevents current-injection faults from motor EMI. |
Use Scenario: Gear position sensing, solenoid driver supervision, and CAN/LIN gateway functions in dual-clutch transmissions. IC Role / Device Role / Timing Role: Secondary controller managing hydraulic valve timing and fault logging via EEPROM-backed nonvolatile storage. Use Value: 300 kcycle EEPROM endurance supports >15-year vehicle service life; advanced timer with dead-time insertion safeguards against shoot-through in solenoid drivers. |
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 |
|---|---|---|---|
| STM8AF6266UAY | 32 Kbyte Flash, 2 Kbyte RAM, same peripherals and package; higher memory density for complex bootloader + OTA update stacks. | Suitable for next-gen ECUs requiring field-upgradable firmware and expanded diagnostic logging. | Select when firmware size exceeds 16 Kbyte or dual-bank Flash for safe OTA updates is required. |
| RL78/F13-BS | Renesas RL78 core, 20 MHz max, 32 Kbyte Flash, 2.7–5.5 V; lacks integrated LIN but offers on-chip CAN 2.0B. | Better fit for CAN-centric architectures (e.g., chassis domain controllers) where LIN is handled externally. | Choose if CAN interface is mandatory and LIN can be added via discrete transceiver; verify 150 °C qualification separately. |
Compared with STM8AF6246UAY, STM8AF6266UAY provides scalable memory headroom within identical footprint and qualification, while RL78/F13-BS shifts architecture toward CAN-focused domains - making STM8AF6246UAY optimal for LIN-dominant, cost-sensitive, high-temp automotive nodes.
Availability
STM8AF6246UAY is available at Aetrix Electronics and suitable for engine control units, body control modules, and electric power steering sensor nodes requiring stable component supply across extended automotive lifecycles.
Supply support for STM8AF6246UAY 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, with R&D and manufacturing facilities across Europe, Asia, and the Americas.
The STM8A automotive microcontroller product line is engineered specifically for AEC-Q100 Grade 0/1 applications in powertrain, chassis, and body electronics - emphasizing thermal resilience, functional safety readiness, and LIN/CAN ecosystem integration.
FAQ
Is STM8AF6246UAY pin-compatible with other STM8AF62xx variants in VFQFPN32?
Yes - STM8AF6246UAY shares identical VFQFPN32 pinout and electrical characteristics with STM8AF6248UAY and STM8AF6266UAY. Pin mapping, power sequencing, and reset behavior are fully aligned, enabling drop-in replacement where Flash/RAM capacity permits.
Does STM8AF6246UAY support SWD or JTAG debugging?
No - it uses ST's Single Wire Interface Module (SWIM) for programming and debug, requiring ST-LINK/V2 or compatible SWIM-capable debuggers. SWIM operates over a single pin (SWIM) with NRST, eliminating need for multi-pin debug headers and saving PCB space.
What is the maximum achievable LIN baud rate and tolerance?
The integrated LINUART supports standard 19.2 kbit/s and 10.4 kbit/s rates with ±15% automatic resynchronization tolerance. At 16 MHz fCPU, baud rate error remains within ±0.5% using internal HSI, meeting LIN 2.2 timing compliance without external crystal.
How is EEPROM endurance verified under automotive thermal cycling?
ST validates 300 kcycle EEPROM endurance per AEC-Q100 stress test plan, including high-temperature write/erase cycling at 125 °C and data retention testing at 150 °C for 1,000 hours. Full qualification report DocID14952 Rev 11 confirms compliance.
STM8AF6246UAY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-VFQFN Exposed Pad
- Series:
- STM8A
- Packaging:
- Tray
- 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:
- 16KB (16K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 512 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AF6246UAY FAQ
1.How can I place an order for STM8AF6246UAY through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF6246UAY 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 STM8AF6246UAY reliable?
The price and inventory of STM8AF6246UAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF6246UAY is usually 5 days.
3.What payment methods are accepted for STM8AF6246UAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF6246UAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF6246UAY?
STM8AF6246UAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF6246UAY 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 STM8AF6246UAY?
For technical support, including STM8AF6246UAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF6246UAY requirements.
6.How does Aetrix verify that STM8AF6246UAY is sourced from the original manufacturer or authorized distributors?
All STM8AF6246UAY 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 STM8AF6246UAY meets industry standards.
7.What is the process for return or replacement of STM8AF6246UAY?
All STM8AF6246UAY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF6246UAY, 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 STM8AF6246UAY part is unused and in its original packaging.
Return procedure for STM8AF6246UAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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