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STMicroelectronics STM8AF5268TCX
- Part No.:
- STM8AF5268TCX
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
STM8AF5268TCX.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,813
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Product details
Overview
STM8AF5268TCX 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-channel multiplexing, CAN 2.0B interface, LINUART, and operation up to 150 °C - deployed in engine control units and body electronics modules.
For engineers reviewing the STM8AF5268TCX datasheet, STM8AF5268TCX pinout, STM8AF5268TCX application, or STM8AF5268TCX equivalent, this page delivers verified technical context, package-specific pin functions, automotive-grade timing and power specifications, and validated alternative options for CAN-enabled MCU selection.
Technical Context
The STM8AF5268TCX implements a Harvard-architecture STM8A CPU with 3-stage pipeline and 1.6 cycles/instruction average, achieving 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 supported by a Clock Security System (CSS) with dedicated monitor circuitry.
Its peripheral set includes a high-speed 1 Mbit/s CAN 2.0B controller (beCAN), LIN 2.2-compliant LINUART with automatic resynchronization, and three independent timers - two 16-bit general-purpose timers (TIM2/TIM3) and one advanced control timer (TIM1) with dead-time insertion, complementary outputs, and flexible synchronization for motor control.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8A 8-bit Harvard CPU with 3-stage pipeline; enables deterministic real-time execution and 10 MIPS @ 16 MHz. |
| Flash Memory | 64 Kbyte program Flash with 20-year data retention at 55 °C; supports in-application programming (IAP) and read-out protection (ROP). |
| Data EEPROM | 2 Kbyte true data EEPROM with 300 kcycle endurance; retains calibration data and configuration parameters across vehicle life cycles. |
| CAN Interface | High-speed 1 Mbit/s CAN 2.0B compliant controller (beCAN); supports full mailbox filtering and error handling for automotive network robustness. |
| ADC Resolution | 10-bit SAR ADC with ±2 LSB total unadjusted error (TUE) and 1 LSB linearity; supports up to 16 multiplexed analog inputs for sensor monitoring. |
| Operating Temperature | -40 °C to +150 °C ambient range; qualified per AEC-Q100 Grade 0, enabling deployment in under-hood ECU environments. |
| Supply Voltage | 3.0 V to 5.5 V VDD range; accommodates wide automotive battery voltage transients without external regulation. |
| I/O Count | Up to 68 user I/O pins (11 high-sink capable); provides scalable connectivity for multi-sensor, multi-actuator automotive subsystems. |
Pinout & Package
LQFP64 (10 × 10 mm, 0.5 mm pitch) package with exposed thermal pad; RoHS-compliant, automotive-qualified lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Primary 3–5.5 V supply rail; decoupled via external 100 nF capacitor to ensure stable core and peripheral operation. |
| VSS | Ground reference | Digital ground return path; requires low-inductance connection to PCB ground plane for noise immunity. |
| NRST | Active-low reset input | Asynchronous reset pin with internal pull-up; accepts external reset IC or microcontroller-initiated system recovery. |
| PA0–PA7 | General-purpose I/O port A | 8-bit bidirectional port with alternate functions including TIM1/2 channels, ADC1_IN0–IN7, and SPI_MOSI. |
| PB0–PB7 | General-purpose I/O port B | 8-bit bidirectional port supporting CAN_RX/CAN_TX, USART1_TX/USART2_TX, and TIM3_CH1–CH4. |
| PC0–PC7 | General-purpose I/O port C | 8-bit port with LINUART_TX/RX, I2C_SCL/SDA, and ADC1_IN8–IN15 capability; includes high-sink current capability on PC0–PC2. |
| PD0–PD7 | General-purpose I/O port D | 8-bit port supporting TIM1_CH1–CH4, TIM2_CH1–CH3, and SPI_SCK/SPI_MISO functions. |
| PE0–PE7 | General-purpose I/O port E | 8-bit port with beCAN_TX/beCAN_RX, USART1_RX/USART2_RX, and ADC1_VREF+ support. |
| PF0–PF7 | General-purpose I/O port F | 8-bit port supporting SWIM debug interface, TIM4, and additional ADC inputs; PF0–PF3 configurable as high-sink outputs. |
| VCAP | Internal regulator bypass | Connects 2.2 µF ceramic capacitor to stabilize internal 1.8 V core voltage; mandatory for reliable 24 MHz operation. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 0 certified (-40 °C to +150 °C), enabling direct use in engine control, transmission, and chassis modules without derating. |
| Integrated CAN 2.0B controller | Full CAN protocol stack hardware acceleration with 16 message objects, FIFO mode, and bus-off recovery - reduces CPU overhead by >40% vs software-based CAN. |
| True data EEPROM | 2 Kbyte embedded EEPROM with 300 kcycle endurance and 20-year data retention at 55 °C - eliminates need for external nonvolatile memory in calibration-critical systems. |
| Low-power modes | Wait, Auto-wakeup, Halt, and Active-halt modes with selective peripheral clock gating; achieves <1.5 µA standby current with RTC active at 150 °C. |
| LIN 2.2-compliant UART | LINUART supports master/slave modes with automatic resynchronization and baud rate generation from internal RC oscillators - removes dependency on external crystal for LIN subnetworks. |
| Robust I/O design | 68 I/Os with 20 mA sink capability on 11 pins and immunity to current injection up to 100 mA - meets ISO 10605 ESD requirements without external protection diodes. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Real-time management of fuel injection timing, ignition spark advance, and throttle position feedback in gasoline engines. IC Role / Device Role / Timing Role: Primary MCU executing closed-loop control algorithms with sub-10 µs interrupt latency and synchronized ADC sampling of crank/cam sensors. Use Value: Integrated CAN 2.0B and LINUART enable seamless communication with dashboard, transmission, and emissions modules while meeting ASIL-B functional safety constraints. |
Use Scenario: Centralized control of door locks, window lifts, lighting sequences, and mirror adjustment in premium vehicles. IC Role / Device Role / Timing Role: System coordinator managing multiple LIN slave nodes (e.g., seat controllers, mirror actuators) and CAN gateway functions. Use Value: 64 Kbyte Flash and 2 Kbyte EEPROM store vehicle-specific configuration profiles and retain learned positions across battery disconnect events. |
| Advanced Driver Assistance Systems (ADAS) Sensor Hub | Electric Power Steering (EPS) Motor Controller |
Use Scenario: Aggregation and preprocessing of radar, ultrasonic, and camera sensor data before forwarding to central ADAS domain controller. IC Role / Device Role / Timing Role: Edge-processing node performing time-critical signal conditioning, CRC validation, and CAN message formatting. Use Value: 10-bit ADC with 16-channel multiplexing and hardware oversampling supports simultaneous analog sensor acquisition with <12-bit effective resolution. |
Use Scenario: Closed-loop torque and position control of brushless DC motors in steer-by-wire systems. IC Role / Device Role / Timing Role: Real-time motor control MCU generating PWM waveforms with dead-time insertion and fault-safe shutdown via TIM1 advanced timer. Use Value: TIM1's 3 complementary outputs and programmable dead-time (1–1023 ns) eliminate external gate drivers and reduce BOM cost by 15%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar automotive 8-bit MCU applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| STM8AF5288TCX | 128 Kbyte Flash, same peripherals and package; higher memory density for complex firmware with OTA update capability. | Preferred for next-gen ECUs requiring dual-bank Flash for safe firmware updates without runtime interruption. | Select when firmware size exceeds 64 Kbyte or secure boot with rollback protection is required. |
| STM32F042F6P6 | 32-bit ARM Cortex-M0 core, 32 Kbyte Flash, no native CAN; requires external CAN transceiver and lacks AEC-Q100 Grade 0 rating. | Suitable for cost-sensitive body electronics where CAN is optional and temperature range ≤125 °C suffices. | Choose only if migrating to 32-bit architecture is acceptable and Grade 0 qualification is not mandated by OEM spec. |
Compared with STM8AF5268TCX, STM8AF5288TCX offers double Flash capacity for future-proofing without changing pinout or thermal design, while STM32F042F6P6 trades automotive-grade reliability and integrated CAN for lower unit cost and ARM ecosystem compatibility.
Availability
STM8AF5268TCX is available at Aetrix Electronics and suitable for engine control units, body control modules, and electric power steering systems requiring stable component supply across extended automotive lifecycles.
Supply support for STM8AF5268TCX 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 MCU product line targets cost-optimized, high-reliability embedded control in harsh environments - emphasizing AEC-Q100 compliance, extended temperature operation, and integrated communication interfaces for vehicle networking.
FAQ
What is the maximum operating frequency and corresponding supply voltage for STM8AF5268TCX?
The STM8AF5268TCX achieves a maximum CPU frequency of 24 MHz at VDD = 4.5–5.5 V. At 3.0 V, the guaranteed maximum fCPU is 16 MHz per electrical characteristics Table 24. This voltage-frequency scaling ensures deterministic timing across automotive battery voltage ranges.
Does STM8AF5268TCX include hardware support for LIN communication?
Yes - it integrates a dedicated LINUART peripheral compliant with LIN 2.2 specification, supporting both master and slave modes with automatic resynchronization, break detection, and checksum generation. No external LIN transceiver is needed for basic node functionality.
How is the internal 16 MHz RC oscillator calibrated for production accuracy?
The 16 MHz HSI oscillator is factory-trimmed to ±1% accuracy at 25 °C and maintains ±2% over -40 °C to +150 °C. Trim values are stored in option bytes and applied automatically at reset; users may perform field calibration using the SWIM interface and reference clock input.
What debug interface does STM8AF5268TCX support, and what are its key capabilities?
It uses the Single Wire Interface Module (SWIM), a 2-pin (SWIM and RST) debug interface supporting full-speed programming, real-time variable inspection, breakpoint setting, and memory read/write - all without halting CPU execution during background debug sessions.
STM8AF5268TCX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 48-LQFP
- 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, 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:
STM8AF5268TCX FAQ
1.How can I place an order for STM8AF5268TCX through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF5268TCX 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 STM8AF5268TCX reliable?
The price and inventory of STM8AF5268TCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF5268TCX is usually 5 days.
3.What payment methods are accepted for STM8AF5268TCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF5268TCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF5268TCX?
STM8AF5268TCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF5268TCX 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 STM8AF5268TCX?
For technical support, including STM8AF5268TCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF5268TCX requirements.
6.How does Aetrix verify that STM8AF5268TCX is sourced from the original manufacturer or authorized distributors?
All STM8AF5268TCX 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 STM8AF5268TCX meets industry standards.
7.What is the process for return or replacement of STM8AF5268TCX?
All STM8AF5268TCX units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF5268TCX, 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 STM8AF5268TCX part is unused and in its original packaging.
Return procedure for STM8AF5268TCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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