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STMicroelectronics STM8AF6268TCY
- Part No.:
- STM8AF6268TCY
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
STM8AF6268TCY.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,950
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Product details
Overview
STM8AF6268TCY from STMicroelectronics is an AEC-Q100 qualified automotive 8-bit microcontroller featuring a 16 MHz STM8A core, 32 Kbyte Flash program memory with 20-year data retention at 55 °C, 1 Kbyte true data EEPROM (300 kcycle endurance), and integrated 10-bit ADC with 2 LSB TUE accuracy across up to 10 channels. It supports LIN 2.2-compliant communication, SPI up to 8 Mbit/s, I²C up to 400 Kbit/s, and operates from 3 to 5.5 V in ambient temperatures up to 150 °C - deployed in engine control modules and body electronics.
For engineers reviewing the STM8AF6268TCY datasheet, STM8AF6268TCY pinout, STM8AF6268TCY application, or STM8AF6268TCY equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade operating parameters, and real-world use-case mapping for ECU design, LIN bus node implementation, and high-temperature embedded control.
Technical Context
The STM8AF6268TCY implements a Harvard-architecture STM8A CPU with 3-stage pipeline and average 1.6 cycles/instruction execution, delivering 10 MIPS at 16 MHz. Its clock system integrates user-trimmable 16 MHz HSI and 128 kHz LSI RC oscillators, plus external crystal support and clock security monitoring.
It includes an advanced control timer with 4 CAPCOM channels, 3 complementary outputs, dead-time insertion, and synchronization capability - alongside two 16-bit general-purpose PWM timers and an 8-bit auto-wakeup timer. The 10-bit ADC supports scan mode, analog watchdog, and individual data buffering per channel.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8A 8-bit Harvard core with 3-stage pipeline; enables deterministic timing and 10 MIPS throughput at 16 MHz. |
| Flash Memory | 32 Kbyte program Flash; retains data ≥20 years at 55 °C after 1,000 write/erase cycles - suitable for field-updatable firmware in harsh environments. |
| Data EEPROM | 1 Kbyte true data EEPROM; rated for 300,000 write/erase cycles - provides robust nonvolatile parameter storage without external serial EEPROM. |
| ADC Resolution & Accuracy | 10-bit SAR ADC with 2 LSB total unadjusted error (TUE); ensures precise sensor signal digitization in engine temperature and pressure sensing. |
| LIN Interface | LINUART compliant with LIN 2.2 specification; supports master/slave modes with automatic resynchronization - enables reliable single-wire communication in automotive sub-networks. |
| Operating Temperature | -40 °C to +150 °C ambient range; qualified per AEC-Q100 Grade 0 - certified for under-hood deployment in powertrain and transmission control units. |
| Supply Voltage Range | 3.0 V to 5.5 V operation; accommodates wide automotive battery voltage transients without external regulation. |
Pinout & Package
STM8AF6268TCY is housed in a VFQFPN32 (5 × 5 mm, 0.5 mm pitch) package with wettable flank leads for automated optical inspection. This thermally enhanced, space-efficient package supports high-reliability automotive PCB assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Main 3–5.5 V supply rail; decoupled via internal VCAP capacitor connection point for stable core voltage regulation. |
| VSS | Ground reference | Digital ground plane connection; separate analog ground (VSSA) available for ADC noise isolation. |
| NRST | Active-low reset input | Asynchronous reset pin with internal pull-up; accepts external reset sources or microcontroller-initiated reset sequences. |
| PA0–PA7 | General-purpose I/O port A | 8-bit bidirectional port with HS I/O capability on PA0–PA3; supports alternate functions including TIM1, ADC, and LINUART. |
| PB0–PB7 | General-purpose I/O port B | 8-bit bidirectional port; PB1/PB2 configurable as LINUART TX/RX; PB4–PB7 support SPI and I²C alternate functions. |
| PC0–PC7 | General-purpose I/O port C | 8-bit bidirectional port; PC0–PC3 support TIM2/TIM3; PC4–PC7 provide ADC input channels and SWIM debug interface. |
| PD0–PD7 | General-purpose I/O port D | 8-bit bidirectional port; PD0–PD3 support TIM4 and beeper; PD4–PD7 reserved for future expansion or test functions. |
| SWIM | Single-wire interface module | Debug and programming interface using one dedicated pin (PC7); enables in-circuit programming and real-time debugging without JTAG overhead. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for continuous operation from −40 °C to +150 °C - meets automotive powertrain reliability requirements without derating. |
| Integrated clock security system (CSS) | Dedicated hardware monitor detects HSE oscillator failure and triggers safe failover to LSI - prevents undetected clock faults in safety-critical control loops. |
| True data EEPROM | 1 Kbyte on-chip EEPROM with 300 kcycle endurance and byte-level erase - eliminates need for external nonvolatile memory in calibration and fault-log storage. |
| Advanced control timer (TIM1) | 16-bit timer with 4 CAPCOM channels, 3 complementary outputs, and programmable dead-time insertion - enables precise 3-phase motor gate drive in electric power steering. |
| LIN 2.2-compliant UART | Hardware-accelerated LIN physical layer with automatic sync-break detection and checksum generation - reduces CPU load and ensures protocol compliance in body control modules. |
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 controller executing closed-loop combustion algorithms with deterministic 16 MHz instruction timing and ADC-sampled sensor inputs. Use Value: On-chip 10-bit ADC with scan mode and analog watchdog enables simultaneous sampling of MAP, IAT, and coolant sensors - reducing external component count and board space. |
Use Scenario: Centralized control of door locks, window lifts, interior lighting, and mirror adjustment via LIN sub-bus networks. IC Role / Device Role / Timing Role: LIN master node coordinating messaging with slave actuators while managing local I/O and power sequencing. Use Value: Integrated LINUART with automatic resynchronization tolerates bus voltage fluctuations and cable length variations - ensuring robust communication in vehicle wiring harnesses. |
| Transmission Control Unit (TCU) | Electric Power Steering (EPS) |
Use Scenario: Monitoring gear position sensors, turbine speed, and solenoid valve status to execute shift logic and torque converter lockup control. IC Role / Device Role / Timing Role: Safety-aware controller with independent watchdog and clock monitor enforcing ASIL-B functional safety constraints. Use Value: AEC-Q100 qualification and 150 °C operation allow direct mounting on transmission housing - eliminating remote mounting and interconnect losses. |
Use Scenario: Driving three-phase brushless motors for assist torque generation with precise phase current sensing and PWM modulation. IC Role / Device Role / Timing Role: Motor control co-processor handling high-frequency PWM generation, current feedback capture, and fault response. Use Value: Advanced control timer (TIM1) with dead-time insertion and complementary outputs directly drives gate drivers - minimizing external logic and propagation delay. |
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 |
|---|---|---|---|
| STM8AF6266TCY | Identical package and pinout; 16 Kbyte Flash (vs. 32 Kbyte), 512-byte EEPROM (vs. 1 Kbyte) | Suitable for cost-sensitive BCMs with smaller firmware footprint and fewer calibration parameters | Select when firmware size ≤16 Kbyte and EEPROM usage <512 bytes; retains identical peripheral set and thermal rating. |
| RL78/F13-GB | Renesas RL78 core; 24 MHz max fCPU, 128 Kbyte Flash, 8 Kbyte RAM; different instruction set and debug interface (E1/E20) | Targeted at higher-performance gateway or infotainment sub-modules requiring larger code space and faster interrupt response | Choose only if migrating legacy RL78 toolchain; not pin- or software-compatible - requires full firmware re-architecture. |
Compared with STM8AF6266TCY, the STM8AF6268TCY provides double Flash and EEPROM capacity for complex diagnostics and adaptive learning algorithms; versus RL78/F13-GB, it offers lower BOM cost and proven integration in existing STM8-based ECU platforms but lacks native CAN and larger RAM.
Availability
STM8AF6268TCY is available at Aetrix Electronics and suitable for engine control units, body control modules, and transmission control units requiring stable component supply across extended automotive product lifecycles.
Supply support for STM8AF6268TCY 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.
The STM8A automotive MCU family targets cost-optimized, high-reliability embedded control in powertrain, chassis, and body electronics - emphasizing AEC-Q100 compliance, extended temperature operation, and integrated LIN/ADC/peripheral sets.
FAQ
What is the maximum operating frequency and corresponding supply voltage range for STM8AF6268TCY?
The STM8AF6268TCY achieves a maximum CPU frequency of 16 MHz across its full 3.0 V to 5.5 V supply range, as confirmed by Figure 8 in the datasheet (DocID14952 Rev 11). At 3.0 V, fCPUmax remains 16 MHz with no derating required - enabling consistent performance during cold-crank battery conditions down to 3 V.
Does STM8AF6268TCY support hardware-based LIN bus communication without external transceivers?
No - the STM8AF6268TCY integrates a LINUART peripheral that handles protocol framing, checksum, and synchronization, but requires an external LIN transceiver (e.g., TLE7259-3GE) to drive the physical bus line. The MCU's LINUART pin outputs TTL-level signals compatible with standard ISO 17987-compliant transceivers.
How is the 1 Kbyte data EEPROM organized and accessed in STM8AF6268TCY?
The 1 Kbyte data EEPROM is mapped into the linear address space starting at 0x4000 and is accessed via dedicated EEPROM control registers (FLASH_DUKR, FLASH_IAPSR). It supports byte/word read/write and page erase operations, with built-in write protection and option byte locking - detailed in Section 5.4.4 of the datasheet.
What debug interface does STM8AF6268TCY use, and what tools are required?
The STM8AF6268TCY uses the Single-Wire Interface Module (SWIM) debug interface on pin PC7. Required tools include ST-LINK/V2 or ST-LINK/V2-1 debug probes with STM8 firmware support, and the ST Visual Develop (STVD) or STM8CubeIDE development environments - all documented in Section 13 of the datasheet.
STM8AF6268TCY 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:
- 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:
- 2K 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:
STM8AF6268TCY FAQ
1.How can I place an order for STM8AF6268TCY through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF6268TCY 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 STM8AF6268TCY reliable?
The price and inventory of STM8AF6268TCY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF6268TCY is usually 5 days.
3.What payment methods are accepted for STM8AF6268TCY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF6268TCY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF6268TCY?
STM8AF6268TCY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF6268TCY 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 STM8AF6268TCY?
For technical support, including STM8AF6268TCY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF6268TCY requirements.
6.How does Aetrix verify that STM8AF6268TCY is sourced from the original manufacturer or authorized distributors?
All STM8AF6268TCY 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 STM8AF6268TCY meets industry standards.
7.What is the process for return or replacement of STM8AF6268TCY?
All STM8AF6268TCY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF6268TCY, 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 STM8AF6268TCY part is unused and in its original packaging.
Return procedure for STM8AF6268TCY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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