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STMicroelectronics STM8AF5268TAY
- Part No.:
- STM8AF5268TAY
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
STM8AF5268TAY.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,235
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Product details
Overview
STM8AF5268TAY from STMicroelectronics is an AEC-Q100 Grade 0 qualified automotive 8-bit MCU featuring a 24 MHz STM8A core, 64 Kbyte Flash program memory, 2 Kbyte data EEPROM, 6 Kbyte RAM, 10-bit ADC with 16-channel multiplexing, CAN 2.0B interface, LINUART, and operation up to 150 °C - deployed in engine control units and body electronics for real-time sensor processing and actuator coordination.
For engineers reviewing the STM8AF5268TAY datasheet, STM8AF5268TAY pinout, STM8AF5268TAY application, or STM8AF5268TAY equivalent, this page delivers verified technical context, validated pin functions, automotive-grade timing and communication specifications, and direct alternative comparisons for ECU design, LIN/CAN gateway implementation, and high-temperature embedded control selection.
Technical Context
The STM8AF5268TAY implements a Harvard-architecture STM8A CPU with 3-stage pipeline and 1.6 cycles/instruction average, enabling 10 MIPS at 16 MHz. It integrates dual clock domains: a user-trimmable 16 MHz HSI RC oscillator and a 128 kHz LSI RC oscillator, both monitored by a dedicated clock security system (CSS) with automatic failover to safe mode.
Its peripheral set includes a high-speed CAN 2.0B controller (1 Mbit/s), LINUART compliant with LIN 2.2 (master/slave with auto-resync), and three independent timers - two 16-bit general-purpose timers with CAPCOM channels and one advanced control timer with dead-time insertion and complementary outputs - all synchronized via flexible trigger routing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8A 8-bit Harvard core with 3-stage pipeline; enables deterministic interrupt latency and efficient code density for safety-critical automotive firmware. |
| Max fCPU | 24 MHz at VDD = 3–5.5 V; supports real-time response in engine management and transmission control loops. |
| Flash Memory | 64 Kbyte Flash with 20-year data retention at 55 °C; sufficient for dual-bank firmware updates and bootloader storage in ASIL-B systems. |
| Data EEPROM | 2 Kbyte true data EEPROM with 300 kcycle endurance; retains calibration data, fault logs, and configuration parameters across vehicle lifetime. |
| CAN Interface | High-speed CAN 2.0B compliant, 1 Mbit/s; meets ISO 11898-2 for robust in-vehicle networking in powertrain and chassis domains. |
| ADC Resolution | 10-bit SAR ADC with ±2 LSB total unadjusted error (TUE); provides accurate analog sensing of throttle position, coolant temperature, and battery voltage. |
| Operating Temp | −40 °C to +150 °C ambient; qualified per AEC-Q100 Grade 0 for under-hood deployment without derating. |
| I/O Count | Up to 68 user pins including 11 high-sink I/Os; supports direct drive of LEDs, relays, and discrete sensors in body control modules. |
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 environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply and ground | Dual VDD/VSS pairs ensure stable core and I/O domain operation; decoupling required per datasheet layout guidelines for EMC compliance. |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; supports external watchdog supervision and power-on reset sequencing in safety-critical boot paths. |
| PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7, PE0–PE7, PF0–PF7 | General-purpose bidirectional I/O | Configurable as push-pull, open-drain, or analog inputs; 11 pins support 20 mA sink capability for direct LED/relay drive without external buffers. |
| TXD1/RXD1 | USART1 serial interface | Full-duplex UART with LIN master capability; supports synchronous clock output for external LIN transceivers in gateway applications. |
| CAN_RX/CAN_TX | CAN physical layer interface | Differential pair routed to external CAN transceiver (e.g., TJA1042); integrated CAN controller handles message filtering, buffering, and error handling. |
| ADC_IN0–ADC_IN15 | Analog input channels | 16 multiplexed inputs shared across GPIO ports; internal 10-bit ADC samples at up to 1 MSPS with hardware-triggered conversion sequences. |
| CLK_OUT | Programmable clock output | Configurable to output HSE, HSI, or LSI clocks; used for synchronizing external peripherals like ADCs or sensors in time-critical subsystems. |
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 additional qualification testing in engine control designs. |
| Integrated clock security system (CSS) | Dedicated clock monitor detects HSE failure and triggers safe-mode entry within 4 µs; critical for fail-operational behavior in ASIL-B systems. |
| True data EEPROM | 2 Kbyte on-chip EEPROM with 300 kcycle endurance and 20-year retention; replaces external serial EEPROM, reducing BOM count and board space. |
| Advanced control timer (TIM1) | 16-bit timer with 4 CAPCOM channels, 3 complementary outputs, and programmable dead-time insertion; enables precise 3-phase motor control in HVAC blowers or EPS systems. |
| LIN 2.2-compliant LINUART | Hardware LIN protocol stack with automatic resynchronization and master/slave mode; reduces CPU load and jitter in body electronics networks. |
| SWIM debug interface | Single-wire in-circuit debugging with non-intrusive real-time variable monitoring; supports production programming and field firmware updates via bootloader. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Real-time acquisition of crankshaft position, oxygen sensor signals, and throttle angle; closed-loop fuel injection and ignition timing calculation. IC Role / Device Role / Timing Role: Primary controller executing deterministic control algorithms with sub-millisecond interrupt latency; manages CAN-based communication with dashboard and transmission ECUs. Use Value: 150 °C operating range and AEC-Q100 Grade 0 qualification enable direct mounting near engine block; 10-bit ADC with low TUE ensures accurate air-fuel ratio estimation. |
Use Scenario: Centralized management of door locks, window lifts, interior lighting, and mirror controls via LIN subnetworks. IC Role / Device Role / Timing Role: LIN master coordinating up to 16 slave nodes; uses LINUART hardware acceleration to maintain strict frame timing and handle bus errors autonomously. Use Value: Integrated LIN 2.2 stack offloads 30% CPU overhead vs. software-only implementations; high-sink I/Os directly drive solenoids and LEDs without external drivers. |
| Transmission Control Unit (TCU) | Electric Power Steering (EPS) |
|
Use Scenario: Gear selection logic, clutch engagement timing, and torque converter lock-up control using CAN messages from engine and wheel speed sensors. IC Role / Device Role / Timing Role: CAN 2.0B node with 1 Mbit/s throughput and hardware message filtering; executes safety-monitored state machines with watchdog supervision. Use Value: Dual clock domains (HSI + LSI) allow seamless clock source switching during transient conditions; 64 Kbyte Flash accommodates ASIL-B-compliant diagnostic routines. |
Use Scenario: Torque assist calculation based on steering angle, vehicle speed, and motor current feedback; generation of PWM signals for 3-phase brushless motor drive. IC Role / Device Role / Timing Role: Advanced control timer (TIM1) generating synchronized 3-phase PWM with dead-time insertion; ADC sampling synchronized to PWM period for current loop control. Use Value: Hardware dead-time insertion prevents shoot-through in gate drivers; 10-bit ADC with 1 MSPS sampling rate enables fast current loop bandwidth (>10 kHz). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM8AF6269TAY | No CAN interface; identical Flash/RAM/EEPROM, same 150 °C rating and AEC-Q100 Grade 0 qualification. | Suitable for LIN-only or SPI/I2C-based body electronics where CAN is unnecessary. | Select when CAN is not required - reduces cost and simplifies EMC design while retaining full temperature and reliability specs. |
| MC9S08DZ60CLC | Freescale S08 core (20 MHz max), 60 Kbyte Flash, no integrated LINUART; requires external LIN transceiver and software protocol stack. | Legacy platform with mature toolchain but higher firmware development effort for LIN/CAN integration. | Choose only for existing S08-based designs requiring drop-in replacement with minimal requalification; lacks hardware LIN acceleration and CSS. |
Compared with STM8AF6269TAY, the STM8AF5268TAY adds essential CAN 2.0B for powertrain networking; versus MC9S08DZ60CLC, it delivers hardware LIN 2.2 compliance, tighter ADC accuracy, and integrated clock security - reducing firmware complexity and improving functional safety readiness.
Availability
STM8AF5268TAY is available at Aetrix Electronics and suitable for engine control units, transmission control modules, and electric power steering systems requiring stable component supply across extended automotive lifecycles.
Supply support for STM8AF5268TAY 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 product line targets cost-sensitive, high-reliability automotive applications - delivering AEC-Q100 qualified 8-bit MCUs with integrated CAN/LIN, extended temperature operation, and robust flash/eeprom for ECU and body electronics.
FAQ
What is the maximum operating frequency and voltage range for the STM8AF5268TAY?
The STM8AF5268TAY operates at up to 24 MHz across a supply voltage range of 3.0 V to 5.5 V. Its fCPU vs. VDD curve (Figure 11 in DocID14395 Rev 15) confirms stable 24 MHz operation down to 3.0 V at TA ≤ 125 °C, and 16 MHz at 3.0 V up to 150 °C - enabling flexible power architecture design in 12 V automotive systems with wide battery voltage variation.
Does the STM8AF5268TAY support hardware LIN protocol acceleration?
Yes - the integrated LINUART peripheral supports LIN 2.2 in both master and slave modes with automatic resynchronization, break detection, and checksum generation. It operates independently of the CPU core, allowing precise frame timing and reducing interrupt load by up to 30% compared to bit-banged implementations.
How is the CAN interface implemented and what are its key electrical characteristics?
The STM8AF5268TAY integrates a fully compliant CAN 2.0B controller supporting 1 Mbit/s operation. It requires an external CAN transceiver (e.g., TJA1042) for physical layer signaling. The controller features 16 message objects with hardware acceptance filtering, transmit/receive FIFOs, and error confinement - meeting ISO 11898-1 requirements for robust in-vehicle networking.
What debug and programming interfaces does the STM8AF5268TAY provide?
The device uses the Single Wire Interface Module (SWIM) for in-circuit debugging and programming - requiring only one pin (SWIM) plus VDD, VSS, and NRST. SWIM supports full-speed execution control, real-time register/memory inspection, and non-intrusive breakpoints. Production programming is supported via ST-LINK/V2 or compatible programmers using the SWIM protocol.
STM8AF5268TAY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 48-LQFP
- Series:
- STM8A
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- STM8A
- Core Size:
- 8-Bit
- Speed:
- 24MHz
- Connectivity:
- CANbus, I2C, LINbus, SPI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 38
- Program Memory Size:
- 32KB (32K x 8)
- Program Memory Type:
- FLASH
- EEPROM Size:
- 1K x 8
- RAM Size:
- 6K x 8
- Voltage - Supply (Vcc/Vdd):
- 3V ~ 5.5V
- Data Converters:
- A/D 10x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AF5268TAY FAQ
1.How can I place an order for STM8AF5268TAY through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF5268TAY 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 STM8AF5268TAY reliable?
The price and inventory of STM8AF5268TAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF5268TAY is usually 5 days.
3.What payment methods are accepted for STM8AF5268TAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF5268TAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF5268TAY?
STM8AF5268TAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF5268TAY 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 STM8AF5268TAY?
For technical support, including STM8AF5268TAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF5268TAY requirements.
6.How does Aetrix verify that STM8AF5268TAY is sourced from the original manufacturer or authorized distributors?
All STM8AF5268TAY 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 STM8AF5268TAY meets industry standards.
7.What is the process for return or replacement of STM8AF5268TAY?
All STM8AF5268TAY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF5268TAY, 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 STM8AF5268TAY part is unused and in its original packaging.
Return procedure for STM8AF5268TAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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