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STMicroelectronics STM8AF5268TCY
- Part No.:
- STM8AF5268TCY
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
STM8AF5268TCY.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,417
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Product details
Overview
STM8AF5268TCY 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, 10-bit ADC with 16-channel multiplexing, CAN 2.0B interface, and operation up to 150 °C - deployed in engine control units for real-time sensor signal acquisition and actuator command execution.
For engineers reviewing the STM8AF5268TCY datasheet, STM8AF5268TCY pinout, STM8AF5268TCY application, or STM8AF5268TCY equivalent, key selection criteria include CAN/LIN coexistence, high-temperature reliability (−40 °C to 150 °C), Flash/data EEPROM endurance (300 kcycle), and integrated clock security system for safety-critical automotive subsystems.
Technical Context
The STM8AF5268TCY implements a Harvard-architecture STM8A CPU with 3-stage pipeline and 1.6-cycle/instruction average, 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) with automatic failover detection.
Peripheral integration includes a dual-mode LINUART compliant with LIN 2.2 (master/slave + auto-resync), a high-speed CAN 2.0B controller supporting 1 Mbit/s, and an advanced control timer with dead-time insertion and complementary outputs - enabling precise motor phase control in electric power steering modules.
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 resource-constrained ECUs. |
| Max fCPU | 24 MHz; supports real-time control loops with sub-μs timing resolution under full peripheral load at 5 V. |
| Flash Memory | 64 Kbyte; retains program data for 20 years at 55 °C, suitable for long-lifecycle automotive deployments without field reprogramming. |
| Data EEPROM | 2 Kbyte true EEPROM; rated for 300 kwrite cycles, used for calibration storage and fault log retention across vehicle lifetime. |
| ADC Resolution | 10-bit with ≤2 LSB total unadjusted error (TUE); provides sufficient dynamic range for analog sensor inputs (e.g., throttle position, coolant temp). |
| CAN Interface | CAN 2.0B compliant at up to 1 Mbit/s; supports message filtering, FIFO buffering, and bus-off recovery for robust in-vehicle networking. |
| Operating Temp | −40 °C to +150 °C; validated per AEC-Q100 Grade 0, enabling placement near powertrain heat sources without derating. |
Pinout & Package
LQFP64 package (10 × 10 mm, 0.5 mm pitch), thermally enhanced for automotive under-hood environments. Pin count and I/O mapping optimized for CAN+LIN+ADC multi-peripheral routing with minimal PCB layer count.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply / Ground | Dual VDD pins (pins 1, 32) and multiple VSS (pins 2, 31, 64) reduce IR drop and improve noise immunity in noisy automotive power domains. |
| PX0–PX7 | General-purpose I/O | Up to 68 user pins including 11 high-sink I/Os (20 mA); withstands current injection per ISO 10605, eliminating external protection diodes. |
| PD0/PD1 | CAN TX/RX | Dedicated differential CAN transceiver interface; supports direct connection to ISO 11898-2 compliant physical layer drivers. |
| PA0–PA7 | ADC input channels | 16-channel multiplexed analog inputs with internal sampling capacitor; supports simultaneous sampling of engine sensor clusters. |
| PC3/PC4 | LINUART TX/RX | Single-wire LIN physical layer interface compliant with LIN 2.2; enables master/slave mode switching and automatic resynchronization after bus faults. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for −40 °C to +150 °C operation with extended life testing; eliminates need for external thermal derating in ECU designs. |
| Integrated clock security system (CSS) | Dedicated hardware monitor detects HSE oscillator failure and triggers safe state entry within 4 clock cycles - critical for ASIL-B compliance. |
| 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. |
| True data EEPROM | 2 Kbyte on-chip EEPROM with 300 kcycle endurance and 20-year data retention at 55 °C; stores adaptive learning parameters without external serial EEPROM. |
| Low-power modes with clock gating | Wait/Auto-wakeup/Halt modes with per-peripheral clock enable/disable; reduces active current to 190 μA/MHz in Wait mode for battery-sensitive modules. |
Applications
| Engine Control Unit (ECU) | Electric Power Steering (EPS) |
|---|---|
Use Scenario: Real-time processing of crankshaft/camshaft position, throttle, and oxygen sensor signals to compute fuel injection timing and spark advance. IC Role / Device Role / Timing Role: Primary control MCU executing closed-loop combustion management with <50 μs interrupt response to crank sensor edges. Use Value: Integrated CAN 2.0B and LINUART allow seamless communication with transmission and body controllers while maintaining ASIL-B functional safety requirements. |
Use Scenario: Torque assist calculation and three-phase BLDC motor commutation in column-assist EPS systems exposed to under-hood temperatures. IC Role / Device Role / Timing Role: Motor control unit generating PWM waveforms with synchronized dead-time and current sensing via 10-bit ADC. Use Value: TIM1's complementary outputs and hardware dead-time insertion eliminate external gate driver ICs, reducing BOM cost and board space. |
| Transmission Control Module (TCM) | Body Control Module (BCM) |
Use Scenario: Gear shift logic, solenoid driver control, and hydraulic pressure monitoring in 6-speed automatic transmissions operating at elevated ambient temperatures. IC Role / Device Role / Timing Role: Safety-relevant controller managing torque converter lock-up and shift solenoids with watchdog supervision and memory ECC. Use Value: AEC-Q100 Grade 0 rating and 150 °C operation permit direct mounting on transmission housing, avoiding costly heat-sinking or remote placement. |
Use Scenario: Centralized management of lighting, door locks, window lifts, and HVAC actuators across vehicle domains using LIN subnetworks. IC Role / Device Role / Timing Role: LIN master node coordinating up to 16 slave nodes with automatic baud rate detection and frame resynchronization. Use Value: Single-chip LINUART + CAN + I²C integration consolidates gateway functionality, reducing inter-IC communication latency and component count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM8AF5286TCY | 128 Kbyte Flash, same peripherals and package; no change in RAM/EEPROM/CAN/LIN specs. | Required where larger firmware image size or future OTA update capability is needed. | Select when >64 Kbyte code space is required without altering hardware layout or thermal design. |
| STM32F042F6P6 | 32-bit ARM Cortex-M0, 32 Kbyte Flash, no native LIN; requires external LIN transceiver and software stack. | Suitable for cost-sensitive non-safety applications where CAN-only connectivity suffices. | Choose only if migrating to 32-bit architecture is acceptable and LIN protocol handling can be offloaded to software or external IC. |
Compared with STM8AF5286TCY, this part offers identical peripheral set and temperature grade but reduced Flash capacity - optimizing cost and power for fixed-function ECUs. Versus STM32F042F6P6, it delivers native LIN 2.2 support and AEC-Q100 Grade 0 assurance without software overhead or external components.
Availability
STM8AF5268TCY is available at Aetrix Electronics and suitable for engine control units, electric power steering systems, and transmission control modules requiring stable component supply across extended automotive production lifecycles.
Supply support for STM8AF5268TCY 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 management ICs, sensors, and automotive-grade silicon for industrial and transportation markets.
The STM8A automotive MCU product line targets cost-optimized, high-reliability electronic control units in powertrain, chassis, and body systems - emphasizing AEC-Q100 compliance, extended temperature operation, and integrated functional safety features.
FAQ
What is the maximum operating frequency of the STM8AF5268TCY at 5.0 V?
The STM8AF5268TCY achieves a maximum CPU frequency of 24 MHz at VDD = 5.0 V, as specified in Section 10.3.1 of the datasheet. This is supported across the full operating temperature range (−40 °C to +150 °C) and verified under worst-case process/voltage corners during AEC-Q100 qualification.
Does the STM8AF5268TCY support LIN 2.2 physical layer without external transceivers?
No - the STM8AF5268TCY integrates a LINUART module compliant with LIN 2.2 protocol (including auto-resynchronization and master/slave modes), but requires an external LIN physical layer transceiver (e.g., TLE7259-3GE) to drive the 12 V bus. The MCU handles framing, checksum, and scheduling; the transceiver manages voltage level shifting and fault protection.
How many CAN message objects does the on-chip CAN controller support?
The STM8AF5268TCY's bxCAN controller supports 16 message objects (mailboxes) with configurable acceptance filtering, FIFO buffering, and automatic retransmission. Each object includes ID masking, data length control, and transmit/receive status flags - sufficient for typical ECU CAN node implementations with mixed standard/extended identifiers.
Is the 2 Kbyte data EEPROM accessible during program execution?
Yes - the 2 Kbyte true data EEPROM supports concurrent read-while-write operation: one sector can be read while another is being programmed or erased. This enables real-time logging of fault codes or calibration updates without halting application code execution, as confirmed in Section 5.4.1 of the reference manual.
STM8AF5268TCY 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 ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AF5268TCY FAQ
1.How can I place an order for STM8AF5268TCY through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF5268TCY 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 STM8AF5268TCY reliable?
The price and inventory of STM8AF5268TCY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF5268TCY is usually 5 days.
3.What payment methods are accepted for STM8AF5268TCY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF5268TCY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF5268TCY?
STM8AF5268TCY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF5268TCY 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 STM8AF5268TCY?
For technical support, including STM8AF5268TCY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF5268TCY requirements.
6.How does Aetrix verify that STM8AF5268TCY is sourced from the original manufacturer or authorized distributors?
All STM8AF5268TCY 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 STM8AF5268TCY meets industry standards.
7.What is the process for return or replacement of STM8AF5268TCY?
All STM8AF5268TCY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF5268TCY, 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 STM8AF5268TCY part is unused and in its original packaging.
Return procedure for STM8AF5268TCY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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