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STMicroelectronics STM8AF5286UAY
- Part No.:
- STM8AF5286UAY
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-UFQFN Exposed Pad
- Datasheet:
-
STM8AF5286UAY.pdf
- Description:
- IC MCU 8BIT 64KB FLASH 32UFQFPN
- Quantity:
- Payment:
- Shipping:
Inventory:2,940
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Product details
Overview
STM8AF5286UAY 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, 6 Kbyte RAM, 10-bit ADC with 16 channels, dual CAN 2.0B interfaces, LINUART, and operation up to 150 °C - deployed in engine control units and battery management systems.
For engineers reviewing the STM8AF5286UAY datasheet, STM8AF5286UAY pinout, STM8AF5286UAY application, or STM8AF5286UAY equivalent, this page delivers verified technical context, validated pin functions, automotive-grade timing and interface specifications, and real-world substitution guidance for ECU and powertrain designs.
Technical Context
The STM8AF5286UAY implements a Harvard-architecture STM8A CPU with 3-stage pipeline and 1.6-cycle/instruction average execution, delivering 10 MIPS at 16 MHz. It integrates dual CAN 2.0B controllers supporting both standard and extended frames, plus LIN 2.2-compliant UART with automatic resynchronization and master/slave mode support.
Clock architecture includes trimmable 16 MHz HSI and 128 kHz LSI oscillators, external crystal support up to 24 MHz, and clock security system (CSS) with dedicated monitor. Power management supports Wait, Auto-wakeup, and Halt modes with user-definable clock gating and low-power reset circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8A 8-bit Harvard CPU with 3-stage pipeline; enables deterministic real-time interrupt response in safety-critical automotive firmware. |
| Max fCPU | 24 MHz at 3–5.5 V supply; sustains full peripheral operation including dual CAN and ADC sampling at rated temperature (−40 °C to +150 °C). |
| Memory | 64 Kbyte Flash (20-year data retention at 55 °C), 2 Kbyte true data EEPROM (300 kcycle endurance), 6 Kbyte RAM - supports OTA update partitioning and calibration storage. |
| ADC | 10-bit resolution, ±2 LSB total unadjusted error, 1 LSB linearity, up to 16 multiplexed inputs - meets ASIL-B sensor signal acquisition requirements. |
| CAN Interface | Two independent CAN 2.0B controllers (beCAN), each supporting 1 Mbit/s bit rate and 32 message objects - enables redundant bus communication in powertrain networks. |
| Operating Temperature | −40 °C to +150 °C ambient; qualified per AEC-Q100 Grade 0 - suitable for under-hood ECU placement without derating. |
| I/O Count | 68 user pins (11 high-sink I/Os); robust against current injection - reduces need for external protection in noisy automotive harness environments. |
Pinout & Package
LQFP64 package (10 × 10 mm, 0.5 mm pitch), RoHS-compliant, with exposed thermal pad for enhanced heat dissipation in high-temperature automotive mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Core & I/O supply | 3.0–5.5 V main power input; decoupled via external 100 nF capacitor near pin for stable MCU operation under load transients. |
| VSS | Digital ground | Reference return path for all digital logic and peripheral I/O; must be connected to low-impedance chassis ground plane. |
| NRST | Active-low reset | Asynchronous reset input with internal pull-up; accepts 1.2–5.5 V logic levels and supports external watchdog or power-on reset assertion. |
| PA0–PA7 | Port A general-purpose I/O | 8-bit bidirectional port with alternate functions including TIM1/2 channels, ADC1_IN0–IN7, SPI_MOSI/MISO - configurable per application needs. |
| PB0–PB7 | Port B general-purpose I/O | 8-bit bidirectional port supporting CAN_RX0/CAN_TX0, USART1_TX/RX, I2C_SCL/SDA - enables dual-CAN and serial comms on single port group. |
| PC0–PC7 | Port C general-purpose I/O | 8-bit bidirectional port with TIM3/4 channels, LINUART, SPI_NSS - supports LIN master mode and synchronous SPI slave selection. |
| PD0–PD7 | Port D general-purpose I/O | 8-bit bidirectional port with CAN_RX1/CAN_TX1, USART2_TX/RX, ADC1_IN8–IN15 - enables second CAN bus and extended analog input routing. |
| PE0–PE7 | Port E general-purpose I/O | 8-bit bidirectional port with TIM1 complementary outputs, beeper, SWIM debug - supports advanced motor control dead-time insertion and in-circuit programming. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for −40 °C to +150 °C operation with full electrical testing - eliminates need for additional qualification in Tier-1 powertrain modules. |
| Dual CAN 2.0B controllers | Independent message buffers, programmable bit timing, and loopback self-test mode - enables fault-tolerant communication across engine and transmission ECUs. |
| LIN 2.2-compliant UART | Hardware-based automatic resynchronization, master/slave mode, and break detection - reduces CPU overhead in body electronics sub-networks. |
| Advanced control timer (TIM1) | 16-bit counter with 4 CAPCOM channels, 3 complementary outputs, and programmable dead-time insertion - supports 3-phase motor gate drive without external logic. |
| Flash & EEPROM endurance | 300 kcycle EEPROM write/erase cycles and 20-year Flash data retention at 55 °C - ensures reliable calibration storage over vehicle lifetime. |
Applications
| Engine Control Unit (ECU) | Electric Power Steering (EPS) |
|---|---|
Use Scenario: Real-time monitoring of crankshaft position, throttle angle, and oxygen sensor signals in gasoline direct injection engines. IC Role / Device Role / Timing Role: Primary MCU executing closed-loop fuel injection and spark timing algorithms with <5 µs interrupt latency. Use Value: Dual CAN interfaces enable simultaneous communication with transmission ECU and instrument cluster while maintaining ASIL-B timing integrity. |
Use Scenario: Torque assist calculation and brushless motor phase commutation in 12 V EPS systems. IC Role / Device Role / Timing Role: Motor controller managing PWM generation, current sensing via 10-bit ADC, and CAN feedback to ADAS domain controller. Use Value: TIM1's complementary outputs with dead-time insertion prevent shoot-through in 3-phase inverter bridge drivers. |
| Battery Management System (BMS) | Heated Rear Window Controller |
Use Scenario: Cell voltage monitoring, thermal management, and SOC estimation in 12 V lead-acid and AGM battery systems. IC Role / Device Role / Timing Role: Data acquisition MCU interfacing with analog front-end ICs via I2C and reporting status over LIN bus. Use Value: Integrated 16-channel 10-bit ADC with hardware scan mode reduces external component count and PCB area. |
Use Scenario: PWM-controlled heating element regulation with overtemperature shutdown and driver status feedback. IC Role / Device Role / Timing Role: LIN slave node receiving heater setpoint commands and reporting fault conditions via LINUART. Use Value: LIN 2.2 compliance with automatic resynchronization tolerates bus voltage fluctuations during vehicle start-stop 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 |
|---|---|---|---|
| STM8AF5288UAY | 128 Kbyte Flash, same peripherals and pinout; higher memory density for complex bootloader + application partitioning. | Suitable where firmware size exceeds 64 Kbyte or dual-bank updates are required. | Select when future firmware expansion or secure OTA capability is mandated. |
| STM32F042F6P6 | 32-bit ARM Cortex-M0 core, 32 Kbyte Flash, single CAN, no LINUART; requires external LIN transceiver and software stack. | Used in cost-sensitive non-safety-critical nodes where 32-bit performance justifies added software complexity. | Choose only if migration to ARM ecosystem and toolchain reuse outweigh loss of integrated LIN and EEPROM reliability. |
Compared with STM8AF5288UAY, the STM8AF5286UAY trades Flash capacity for lower cost and smaller footprint while retaining identical CAN/LIN/ADC capabilities; versus STM32F042F6P6, it delivers plug-and-play automotive interface integration without external components or stack licensing.
Availability
STM8AF5286UAY is available at Aetrix Electronics and suitable for engine control units, electric power steering modules, and battery management systems requiring stable component supply across extended automotive product lifecycles.
Supply support for STM8AF5286UAY 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 devices, sensors, and analog ICs for automotive, industrial, and consumer markets.
The STM8A automotive microcontroller product line targets cost-sensitive, high-reliability embedded control applications in powertrain, chassis, and body electronics - emphasizing AEC-Q100 compliance, long-term availability, and minimal external component count.
FAQ
What is the maximum operating frequency of the STM8AF5286UAY at 5.0 V supply?
The STM8AF5286UAY achieves a maximum CPU frequency of 24 MHz at 5.0 V supply voltage, as confirmed by STMicroelectronics' electrical characteristics table (Section 10.3.1). This frequency is maintained across the full −40 °C to +150 °C operating temperature range without derating, enabling deterministic real-time execution in under-hood applications.
Does the STM8AF5286UAY support LIN communication without external transceivers?
Yes - the STM8AF5286UAY integrates a LINUART peripheral compliant with LIN 2.2 specification, supporting both master and slave modes with hardware-based automatic resynchronization and break detection. It drives standard LIN bus directly using a single external 1 kΩ pull-up resistor and optional transient protection diode, eliminating need for discrete LIN transceivers in most body electronics nodes.
How many CAN interfaces does the STM8AF5286UAY include, and what protocol versions are supported?
The STM8AF5286UAY includes two independent CAN 2.0B controllers (beCAN), each supporting full CAN 2.0B protocol with both standard (11-bit) and extended (29-bit) identifier frames. Both controllers operate at up to 1 Mbit/s bit rate, support programmable timing registers, and feature 32 message objects with priority arbitration - enabling redundant or multi-domain CAN network implementation.
Is the data EEPROM on the STM8AF5286UAY truly wear-levelled, and what is its guaranteed endurance?
The STM8AF5286UAY features true data EEPROM (not emulated in Flash) with guaranteed endurance of 300,000 write/erase cycles per byte, as specified in Section 5.4 of the datasheet. It supports byte-level erase and write operations, includes hardware write protection, and retains data for 20 years at 55 °C - meeting automotive calibration storage requirements without software wear-leveling overhead.
STM8AF5286UAY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-UFQFN Exposed Pad
- Series:
- STM8A
- Packaging:
- Tray
- 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 ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AF5286UAY FAQ
1.How can I place an order for STM8AF5286UAY through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF5286UAY 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 STM8AF5286UAY reliable?
The price and inventory of STM8AF5286UAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF5286UAY is usually 5 days.
3.What payment methods are accepted for STM8AF5286UAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF5286UAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF5286UAY?
STM8AF5286UAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF5286UAY 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 STM8AF5286UAY?
For technical support, including STM8AF5286UAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF5286UAY requirements.
6.How does Aetrix verify that STM8AF5286UAY is sourced from the original manufacturer or authorized distributors?
All STM8AF5286UAY 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 STM8AF5286UAY meets industry standards.
7.What is the process for return or replacement of STM8AF5286UAY?
All STM8AF5286UAY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF5286UAY, 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 STM8AF5286UAY part is unused and in its original packaging.
Return procedure for STM8AF5286UAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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