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STMicroelectronics STM8AF6246UAX
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- Part No.:
- STM8AF6246UAX
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
STM8AF6246UAX.pdf
- Description:
- IC MCU 8BIT 16KB FLASH 32VFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:2,577
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Product details
Overview
STM8AF6246UAX from STMicroelectronics is an AEC-Q100 qualified automotive 8-bit microcontroller featuring a 16 MHz STM8A core, 16 Kbyte Flash memory, 1 Kbyte data EEPROM, 10-bit ADC with 10 multiplexed channels, and LINUART, SPI, and I²C interfaces. It operates from 3 to 5.5 V and supports ambient temperatures up to 150 °C, targeting engine control units and body electronics modules requiring robust timing and communication.
For engineers reviewing the STM8AF6246UAX datasheet, STM8AF6246UAX pinout, STM8AF6246UAX application, or STM8AF6246UAX equivalent, this page delivers verified technical context, package-specific pin functions, automotive-grade low-power modes, and validated alternative options for ECU design and replacement sourcing.
Technical Context
The STM8AF6246UAX 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 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 interrupt sources mapped across five priority levels. Analog subsystem includes a 10-bit ADC with 2 LSB total unadjusted error, scan mode, analog watchdog, and individual channel data buffers - all qualified for automotive operation at 150 °C junction temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8A 8-bit Harvard CPU with 3-stage pipeline; enables deterministic real-time response in safety-critical automotive tasks. |
| Max Clock Frequency | 16 MHz fCPU; supports 10 MIPS throughput for LIN protocol timing and sensor sampling at ≤100 µs intervals. |
| Flash Memory | 16 Kbyte program Flash with 20-year data retention at 55 °C after 1 kcycle; sufficient for compact ECU firmware with bootloader space. |
| Data EEPROM | 1 Kbyte true data EEPROM with 300 kcycle endurance; stores calibration data, fault logs, and configuration parameters without external NV memory. |
| ADC Resolution & Channels | 10-bit ADC with ±2 LSB TUE accuracy and up to 10 multiplexed inputs; meets ASIL-B sensor interface requirements for throttle position or coolant temp. |
| Operating Temperature | −40 °C to 150 °C ambient; qualified per AEC-Q100 Grade 0 for under-hood placement without derating. |
| Communication Peripherals | LINUART (LIN 2.2 compliant), SPI (up to 8 Mbit/s), I²C (up to 400 Kbit/s); enables direct connection to LIN slave nodes, EEPROMs, and sensors in distributed architectures. |
Pinout & Package
STM8AF6246UAX is housed in a VFQFPN32 (5 × 5 mm, 0.5 mm pitch) package with exposed thermal pad. This ultra-thin quad flat no-lead package supports high-density automotive PCB layouts and enhanced thermal dissipation in constrained spaces.
| 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 transients. |
| VSS | Ground reference | Digital ground plane connection; separate analog/digital grounding not required due to integrated noise suppression. |
| NRST | Active-low reset input | Asynchronous reset pin with internal pull-up; accepts 1.2–5.5 V logic levels and supports external watchdog reset injection. |
| PA0–PA7 | General-purpose I/O port A | 8-bit bidirectional port with HS capability; configurable as LINUART TX/RX, SPI SCK/MOSI/MISO, or ADC inputs CH0–CH7. |
| PB0–PB7 | General-purpose I/O port B | 8-bit port supporting TIM1/2/4 channels, I²C SCL/SDA, and SWIM debug interface; includes internal pull-ups. |
| PC0–PC7 | General-purpose I/O port C | 8-bit port with TIM3 outputs, ADC CH8/CH9, and LINUART alternate functions; supports high-sink current (20 mA) on selected pins. |
| PD0–PD7 | General-purpose I/O port D | 8-bit port with advanced timer complementary outputs, dead-time control, and auto-wakeup timer input; critical for motor gate drive sequencing. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for −40 °C to 150 °C operation with full electrical characterization; eliminates need for external thermal derating in engine bay applications. |
| Integrated clock security system (CSS) | Dedicated hardware monitor detects HSE oscillator failure and triggers safe state entry within 4 µs; satisfies ISO 26262 ASIL-B fault detection timing. |
| True data EEPROM | 1 Kbyte on-chip EEPROM with 300 kcycle endurance and automatic wear leveling; replaces external serial EEPROM in cost-sensitive ECUs. |
| LIN 2.2-compliant UART | Hardware LIN master/slave with automatic resynchronization and break detection; reduces CPU load by >70% vs software bit-banged LIN stacks. |
| Advanced control timer (TIM1) | 16-bit timer with 4 CAPCOM channels, 3 complementary outputs, and programmable dead-time insertion; enables precise 3-phase motor commutation without external gate drivers. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Real-time monitoring of crankshaft position, throttle angle, and coolant temperature in gasoline engine management systems. IC Role / Device Role / Timing Role: Primary MCU executing closed-loop fuel injection and ignition timing algorithms with sub-100 µs interrupt latency. Use Value: Integrated 10-bit ADC with analog watchdog ensures sensor fault detection within 2 ms; LINUART enables diagnostics via vehicle OBD-II port. |
Use Scenario: Centralized control of door locks, window lifts, lighting, and HVAC actuators in passenger compartment networks. IC Role / Device Role / Timing Role: LIN master node coordinating up to 16 slave devices (e.g., mirror controls, seat modules) using hardware resynchronization. Use Value: 16 Kbyte Flash accommodates multi-function firmware with OTA update capability; 150 °C rating allows placement near fuse boxes or junction blocks. |
| Transmission Control Unit (TCU) | Electric Power Steering (EPS) |
|
Use Scenario: Gear selection logic, solenoid driver control, and CAN/LIN gateway functionality in 6-speed automatic transmission systems. IC Role / Device Role / Timing Role: Safety-monitoring co-processor interfacing with main CAN-based TCU MCU via SPI; handles fail-safe valve actuation. Use Value: Advanced control timer (TIM1) generates PWM with <100 ns dead-time resolution for proportional solenoid drivers; meets ASIL-B functional safety targets. |
Use Scenario: Torque assist calculation and motor phase current regulation in column-assist EPS systems. IC Role / Device Role / Timing Role: Real-time motor controller managing three-phase inverter gate signals using complementary PWM outputs and current sense ADC inputs. Use Value: High-sink I/O pins drive gate drivers directly; 1 Kbyte EEPROM stores torque calibration offsets and motor learning parameters across 300k+ cycles. |
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 with identical pinout. | Suitable for larger firmware images requiring bootloader + application partitioning or dual-bank updates. | Select when firmware size exceeds 16 Kbyte or future scalability to 32 Kbyte is required without PCB redesign. |
| RL78/F13-GB | Renesas RL78 core, 20 MHz max, 32 Kbyte Flash, 2.5–5.5 V supply; lacks LINUART but adds CAN 2.0B controller. | Better suited for CAN-centric architectures (e.g., chassis domain controllers) where LIN is secondary or absent. | Choose when CAN bus integration is mandatory and LIN is handled by separate PHY or omitted entirely. |
Compared with STM8AF6246UAX, STM8AF6266UAY offers memory headroom without changing layout or toolchain, while RL78/F13-GB shifts focus to CAN-based networking at the cost of LIN-native support and AEC-Q100 Grade 0 thermal margin.
Availability
STM8AF6246UAX is available at Aetrix Electronics and suitable for engine control units, body control modules, transmission control units, and electric power steering systems requiring stable component supply across extended automotive lifecycles.
Supply support for STM8AF6246UAX 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 for industrial and transportation markets.
The STM8A automotive microcontroller product line targets cost-sensitive, high-reliability embedded control applications-including engine management, lighting, and battery systems-with AEC-Q100 qualification and extended temperature support built into silicon.
FAQ
What is the maximum operating junction temperature for STM8AF6246UAX?
The STM8AF6246UAX is rated for a maximum junction temperature of 150 °C and qualified per AEC-Q100 Grade 0. Electrical characteristics are fully specified across −40 °C to 150 °C ambient, enabling direct mounting in high-heat zones like engine compartments without heatsinking or airflow assumptions.
Does STM8AF6246UAX support in-circuit debugging via SWIM?
Yes, STM8AF6246UAX features a Single Wire Interface Module (SWIM) that enables full in-circuit debugging and programming using ST-LINK/V2 or compatible tools. SWIM requires only one dedicated pin (PD3) and supports breakpoint setting, register inspection, and flash read/write operations without halting real-time peripherals.
How many LIN nodes can STM8AF6246UAX manage as a master?
As a LIN master, STM8AF6246UAX supports up to 16 slave nodes per LIN cluster using its hardware LINUART peripheral. The integrated auto-resynchronization and checksum verification offload CPU overhead, allowing guaranteed frame response times under 200 µs even with full diagnostic frames and error recovery sequences.
Is the 1 Kbyte data EEPROM accessible during code execution?
Yes, the 1 Kbyte true data EEPROM supports concurrent read-while-write operation: firmware can execute from Flash while writing calibration data or fault logs to EEPROM. Write cycles are atomic and interruptible, with hardware error detection ensuring data integrity after power loss or reset events.
STM8AF6246UAX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-VFQFN Exposed Pad
- 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:
- 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:
STM8AF6246UAX FAQ
1.How can I place an order for STM8AF6246UAX through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF6246UAX 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 STM8AF6246UAX reliable?
The price and inventory of STM8AF6246UAX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF6246UAX is usually 5 days.
3.What payment methods are accepted for STM8AF6246UAX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF6246UAX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF6246UAX?
STM8AF6246UAX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF6246UAX 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 STM8AF6246UAX?
For technical support, including STM8AF6246UAX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF6246UAX requirements.
6.How does Aetrix verify that STM8AF6246UAX is sourced from the original manufacturer or authorized distributors?
All STM8AF6246UAX 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 STM8AF6246UAX meets industry standards.
7.What is the process for return or replacement of STM8AF6246UAX?
All STM8AF6246UAX units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF6246UAX, 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 STM8AF6246UAX part is unused and in its original packaging.
Return procedure for STM8AF6246UAX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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