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STMicroelectronics STM8AF5286UDX
- Part No.:
- STM8AF5286UDX
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
STM8AF5286UDX.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 32UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:3,103
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Product details
Overview
STM8AF5286UDX from STMicroelectronics is an AEC-Q100 Grade 0 qualified automotive 8-bit microcontroller featuring a 24 MHz STM8A core, 64 Kbyte Flash program memory, 2 Kbyte data EEPROM, 10-bit ADC with 16-channel multiplexing, CAN 2.0B interface, and operation up to 150 °C. It integrates LINUART (LIN 2.2 compliant), USART, SPI, I²C, advanced control timer with dead-time insertion, and 68 user I/O pins - deployed in engine control units and battery management systems.
For engineers reviewing the STM8AF5286UDX datasheet, STM8AF5286UDX pinout, STM8AF5286UDX application, or STM8AF5286UDX equivalent, key selection criteria include automotive-grade CAN/LIN timing robustness, high-temperature Flash retention (20 years at 55 °C), true data EEPROM endurance (300 kcycles), and support for Halt/Wait low-power modes with clock gating.
Technical Context
The STM8AF5286UDX implements a Harvard-architecture STM8A CPU with 3-stage pipeline and average 1.6 cycles/instruction throughput, delivering 10 MIPS at 16 MHz. Its clock system includes 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 37 external interrupts mapped across 5 vectors. The CAN 2.0B peripheral supports 1 Mbit/s operation with message filtering and automatic retransmission, while the LINUART provides master/slave mode with automatic resynchronization per LIN 2.2.
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 firmware. |
| Max fCPU | 24 MHz at 3–5.5 V supply; supports time-sensitive control loops in motor drivers and powertrain modules. |
| Flash Memory | 64 Kbyte program Flash with 20-year data retention at 55 °C; suitable for long-lifecycle vehicle ECUs without field updates. |
| Data EEPROM | 2 Kbyte true data EEPROM rated for 300 kwrite cycles; stores calibration data, fault logs, and configuration parameters reliably. |
| CAN Interface | High-speed CAN 2.0B compliant at up to 1 Mbit/s; meets ISO 11898-1 for robust in-vehicle network communication. |
| ADC Resolution | 10-bit SAR ADC with ±2 LSB total unadjusted error (TUE) and 16 multiplexed inputs; enables precise sensor signal acquisition (e.g., temperature, pressure). |
| Operating Temp | −40 °C to +150 °C ambient; validated for under-hood applications including transmission control and battery monitoring. |
| AEC-Q100 Grade | Grade 0 qualification per AEC-Q100 Rev G; confirms reliability for automotive safety-related functions without derating. |
Pinout & Package
LQFP64 package (10 × 10 mm, 0.5 mm pitch) with 64 leads; RoHS-compliant, moisture sensitivity level MSL3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual 3–5.5 V supply domains with dedicated VCAP capacitor pin for internal voltage regulation stability. |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; supports external watchdog or power-on reset sequencing. |
| PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7, PE0–PE7, PF0–PF7 | General-purpose I/O ports | 68 total user I/Os; 11 high-sink pins (20 mA) tolerate current injection; configurable as analog inputs, timers, or communication peripherals. |
| TX/RX (USART1) | Universal synchronous/asynchronous transceiver | Full-duplex UART with clock output for synchronous mode; used for diagnostics and bootloader communication. |
| TXD/RXD (LINUART) | LIN 2.2 transceiver interface | Single-wire LIN physical layer support; automatic baud rate resynchronization eliminates need for external crystal on slave nodes. |
| CAN_TX / CAN_RX | CAN 2.0B differential transceiver interface | Direct connection to external CAN transceiver (e.g., TJA1042); supports dominant/recessive bit timing per ISO 11898-2. |
| CLK_OUT | Programmable clock output | Configurable to output HSI, LSI, or peripheral clocks; enables trace clocking or synchronization of external logic. |
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 3-phase motor gate drive without external logic. |
| Low-Power Modes | Halt, Active-Halt, Wait, and Auto-Wakeup modes with selective peripheral clock gating - reduces current to <1 µA in Halt mode for battery-backed subsystems. |
| SWIM Debug Interface | Single-wire debug and programming interface using only NRST pin - simplifies PCB layout and enables in-system firmware updates without JTAG header. |
| Flash Protection | Read-out protection (ROP), write protection (WP), and user boot code (UBC) locking - prevents unauthorized firmware extraction or overwriting in production ECUs. |
| Analog Peripherals | 10-bit ADC with hardware-accelerated scan mode, plus independent voltage reference (VREFINT) and temperature sensor - supports self-calibration and thermal monitoring. |
Applications
| Engine Control Unit (ECU) | Electric Power Steering (EPS) |
|---|---|
Use Scenario: Real-time spark/fuel timing calculation and actuator control in gasoline engines. IC Role / Device Role / Timing Role: Primary MCU executing closed-loop combustion control algorithms with sub-millisecond interrupt latency. Use Value: CAN 2.0B and LIN 2.2 interfaces enable seamless integration into vehicle networks; 150 °C rating permits placement near engine block. |
Use Scenario: Torque assist computation and motor phase commutation in column-assist EPS systems. IC Role / Device Role / Timing Role: Safety-relevant controller managing torque sensor fusion, motor PWM generation, and fault detection per ISO 26262 ASIL-B decomposition. Use Value: Advanced control timer delivers synchronized 3-phase PWM with dead-time; AEC-Q100 Grade 0 ensures functional safety compliance. |
| Battery Management System (BMS) | Body Control Module (BCM) |
Use Scenario: Cell voltage monitoring, state-of-charge estimation, and thermal management in 12 V lead-acid or 48 V mild-hybrid battery packs. IC Role / Device Role / Timing Role: Sensor hub aggregating ADC readings, communicating via LIN to main BMS controller, and triggering thermal shutdown. Use Value: Integrated 10-bit ADC with 16-channel mux eliminates external multiplexer; EEPROM stores cell calibration offsets across lifetime. |
Use Scenario: Centralized control of lighting, door locks, window lifts, and HVAC actuators in modern vehicle body electronics. IC Role / Device Role / Timing Role: Network gateway coordinating LIN slave nodes (e.g., seat modules) and CAN backbone messages. Use Value: Dual LIN/CAN capability allows direct interfacing with both legacy and modern subsystems; 68 I/Os support diverse peripheral drive requirements. |
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 |
|---|---|---|---|
| STM8AF6286UDX | No CAN interface; retains LIN, USART, SPI, I²C, same Flash/EEPROM size and 150 °C rating. | Suitable for LIN-only body electronics where CAN bus integration is unnecessary. | Select when CAN is not required - lower cost and identical footprint but no CAN PHY support. |
| STM8AF52A6UDX | 128 Kbyte Flash (vs. 64 Kbyte), same peripherals and AEC-Q100 Grade 0 rating. | Preferred for complex firmware with OTA update partitions or dual-bank bootloaders. | Choose for future-proofing or larger application code size; pin-compatible upgrade path with no layout change. |
Compared with STM8AF5286UDX, STM8AF6286UDX removes CAN capability for cost-sensitive LIN-only nodes, while STM8AF52A6UDX doubles Flash capacity for feature-rich firmware - both retain identical thermal, I/O, and timing specifications.
Availability
STM8AF5286UDX is available at Aetrix Electronics and suitable for engine control units, electric power steering systems, and battery management systems requiring stable component supply across extended automotive product lifecycles.
Supply support for STM8AF5286UDX 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 components since 1987.
The STM8A automotive MCU product line targets cost-optimized, high-reliability embedded control in powertrain, chassis, and body electronics - emphasizing AEC-Q100 qualification, extended temperature operation, and integrated communication peripherals.
FAQ
What is the maximum operating frequency and voltage range for STM8AF5286UDX?
The STM8AF5286UDX operates at up to 24 MHz CPU frequency across a supply voltage range of 3.0 V to 5.5 V. Electrical characteristics are guaranteed over the full −40 °C to +150 °C ambient temperature range, with fCPU scaling linearly versus VDD per Figure 11 in the datasheet.
Does STM8AF5286UDX support in-circuit debugging and programming?
Yes - it features the Single Wire Interface Module (SWIM), enabling full in-circuit debugging, flash programming, and memory inspection using only the NRST pin and GND. ST-LINK/V2 and compatible debuggers support SWIM protocol without requiring additional debug headers.
How is CAN functionality implemented and what transceiver is recommended?
CAN is implemented via the beCAN peripheral supporting CAN 2.0B protocol at up to 1 Mbit/s. It requires an external high-speed CAN transceiver such as the TJA1042 or SN65HVD230 connected to CAN_TX/CAN_RX pins. The MCU handles protocol stack and message filtering; physical layer compliance depends on transceiver selection.
What packaging and RoHS status does STM8AF5286UDX have?
STM8AF5286UDX is supplied in LQFP64 (10 × 10 mm, 0.5 mm pitch) package, lead-free and RoHS-compliant per EU Directive 2011/65/EU. It meets moisture sensitivity level MSL3 and is qualified for reflow soldering per JEDEC J-STD-020.
STM8AF5286UDX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-UFQFN Exposed Pad
- Series:
- STM8A
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- STM8A
- Core Size:
- 8-Bit
- Speed:
- 24MHz
- Connectivity:
- CANbus, I2C, LINbus, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 25
- Program Memory Size:
- 64KB (64K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 2K x 8
- RAM Size:
- 6K x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 5.5V
- Data Converters:
- A/D 6x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 150°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AF5286UDX FAQ
1.How can I place an order for STM8AF5286UDX through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF5286UDX 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 STM8AF5286UDX reliable?
The price and inventory of STM8AF5286UDX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF5286UDX is usually 5 days.
3.What payment methods are accepted for STM8AF5286UDX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF5286UDX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF5286UDX?
STM8AF5286UDX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF5286UDX 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 STM8AF5286UDX?
For technical support, including STM8AF5286UDX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF5286UDX requirements.
6.How does Aetrix verify that STM8AF5286UDX is sourced from the original manufacturer or authorized distributors?
All STM8AF5286UDX 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 STM8AF5286UDX meets industry standards.
7.What is the process for return or replacement of STM8AF5286UDX?
All STM8AF5286UDX units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF5286UDX, 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 STM8AF5286UDX part is unused and in its original packaging.
Return procedure for STM8AF5286UDX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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