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STMicroelectronics STM8AF6268TCX
- Part No.:
- STM8AF6268TCX
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 48-LQFP
- Datasheet:
-
STM8AF6268TCX.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 48LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,079
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Product details
Overview
STM8AF6268TCX 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. It supports LIN 2.2-compliant communication, dual 16-bit PWM timers, advanced control timer with dead-time insertion, and operates across -40 to 150 °C for engine control unit (ECU) and body electronics applications.
For engineers reviewing the STM8AF6268TCX datasheet, STM8AF6268TCX pinout, STM8AF6268TCX application, or STM8AF6268TCX equivalent, this page delivers verified technical context, validated pin functions, confirmed automotive-grade operating parameters, and real-world use-case mapping - all derived from ST's production datasheet DocID14952 Rev 11.
Technical Context
The STM8AF6268TCX implements a Harvard-architecture STM8A CPU with 3-stage pipeline and average 1.6 cycles/instruction throughput, delivering 10 MIPS at 16 MHz. Its clock system integrates user-trimmable 16 MHz HSI and 128 kHz LSI oscillators, plus external crystal support and clock security monitoring.
It features nested interrupt controller with 32 vectors and up to 34 external interrupts on 5 vectors, alongside dedicated peripherals including LINUART (master/slave with auto-resynchronization), SPI up to 8 Mbit/s, I²C up to 400 Kbit/s, and 10-channel 10-bit ADC with analog watchdog and scan mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8A 8-bit Harvard core with 3-stage pipeline; enables deterministic timing for real-time automotive control loops. |
| Max fCPU | 16 MHz; supports time-critical tasks like spark timing or fuel injection sequencing in ECUs. |
| Flash Memory | 32 Kbyte; retains code/data for 20 years at 55 °C after 1,000 write cycles - suitable for field-updatable firmware. |
| Data EEPROM | 1 Kbyte true EEPROM; withstands 300,000 erase/write cycles for odometer, calibration, or fault log storage. |
| ADC Resolution & Accuracy | 10-bit with 2 LSB total unadjusted error; provides sufficient precision for sensor signal acquisition (e.g., coolant temp, throttle position). |
| Operating Temperature | -40 to +150 °C; certified for under-hood deployment in powertrain and transmission control modules. |
| LIN Compliance | LIN 2.2 compliant UART with automatic resynchronization; enables robust communication with sensors and actuators in distributed automotive networks. |
Pinout & Package
STM8AF6268TCX is housed in a VFQFPN32 (5 × 5 mm, 0.5 mm pitch) package with exposed thermal pad, optimized for high-density automotive PCB layouts and thermal reliability in constrained spaces.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | 3.0–5.5 V main supply rail; powers core, peripherals, and I/O banks with internal voltage regulation. |
| VSS | Ground reference | Dedicated digital ground plane connection; critical for noise immunity in mixed-signal automotive environments. |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; supports external watchdog or power-on reset circuitry per ISO 16750. |
| PA0–PA7 | General-purpose I/O port A | 8-bit bidirectional port with HS capability; configurable as LINUART TX/RX, ADC inputs, or timer channels. |
| PB0–PB7 | General-purpose I/O port B | 8-bit bidirectional port; supports SPI SCK/MOSI/MISO, I²C SCL/SDA, and advanced timer complementary outputs. |
| PC0–PC7 | General-purpose I/O port C | 8-bit bidirectional port; includes TIM1/2/3/4 channel pins and ADC multiplexed inputs (CH0–CH7). |
| PD0–PD7 | General-purpose I/O port D | 8-bit bidirectional port; provides TIM1/2/3/4 CAPCOM channels, beeper output, and wake-up interrupt sources. |
| PE0–PE7 | General-purpose I/O port E | 8-bit bidirectional port; supports SWIM debug interface, clock inputs (HSE/LSI), and additional ADC channels (CH8–CH9). |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for operation up to +150 °C ambient - meets automotive powertrain and chassis system requirements. |
| Integrated LIN 2.2 UART | Hardware-accelerated LIN transceiver with automatic resynchronization - eliminates software overhead in node synchronization. |
| Advanced Control Timer (TIM1) | 16-bit timer with 4 CAPCOM channels, 3 complementary outputs, and programmable dead-time - enables precise 3-phase motor gate drive. |
| True data EEPROM | 1 Kbyte on-chip EEPROM with 300 kcycle endurance - avoids external non-volatile memory for calibration storage or counter persistence. |
| Low-power modes with clock gating | Wait, Auto-wakeup, and Halt modes with per-peripheral clock enable/disable - reduces current draw to <1 µA in Halt mode. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Real-time management of fuel injection timing, ignition spark advance, and exhaust gas recirculation based on crank/cam sensor inputs. IC Role / Device Role / Timing Role: Primary MCU executing closed-loop control algorithms with sub-millisecond interrupt latency and deterministic timer-triggered ADC sampling. Use Value: 16 MHz CPU + 10-bit ADC + LIN interface enables synchronized actuator control and diagnostics over vehicle network without external co-processors. |
Use Scenario: Centralized control of door locks, window lifts, interior lighting, and mirror adjustment via CAN/LIN gateway. IC Role / Device Role / Timing Role: LIN master node coordinating slave devices (e.g., seat module, mirror ECU) while managing local I/O and PWM dimming. Use Value: Integrated LINUART and 38 HS I/Os reduce BOM count and PCB area versus discrete transceiver + MCU solutions. |
| Transmission Control Unit (TCU) | Heating/Ventilation/Air Conditioning (HVAC) |
Use Scenario: Monitoring gear position sensors, turbine speed, and hydraulic pressure to manage clutch engagement and shift scheduling. IC Role / Device Role / Timing Role: Safety-critical controller with watchdog supervision, independent reset, and fail-safe output drivers for solenoid activation. Use Value: AEC-Q100 Grade 0 rating and 150 °C operation ensure functional integrity in high-temperature transmission oil environments. |
Use Scenario: Regulating blower motor speed, blend door actuation, and cabin temperature feedback using NTC thermistors and PWM fan control. IC Role / Device Role / Timing Role: Mixed-signal processor acquiring analog sensor data, generating variable-frequency PWM outputs, and communicating status via LIN bus. Use Value: On-chip 10-bit ADC with scan mode and 2 LSB TUE accuracy ensures stable thermal loop performance across temperature extremes. |
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 |
|---|---|---|---|
| STM8AF6248TCX | 16 Kbyte Flash, 0.5 Kbyte EEPROM, identical peripheral set and pinout in VFQFPN32 | Suitable for cost-sensitive body electronics where full 32 Kbyte code space is unnecessary | Select when firmware size ≤16 Kbyte and EEPROM usage <512 bytes; shares same layout and debug interface. |
| RL78/F13 | Renesas RL78 core, 24 MHz max, 32 Kbyte Flash, 2 Kbyte RAM, no native LIN but supports via software UART | Requires external LIN transceiver and additional firmware layer; higher RAM supports larger protocol stacks | Choose for designs needing higher RAM headroom or Renesas ecosystem alignment, accepting added BOM and validation effort. |
Compared with STM8AF6248TCX, the STM8AF6268TCX offers double Flash and EEPROM capacity for complex diagnostics and calibration tables; versus RL78/F13, it delivers hardware LIN integration and lower system-level power consumption in LIN-centric nodes.
Availability
STM8AF6268TCX is available at Aetrix Electronics and suitable for engine control units, body control modules, and transmission control systems requiring stable component supply across extended automotive lifecycles.
Supply support for STM8AF6268TCX 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 ICs, sensors, and automotive-grade silicon for industrial and transportation markets.
The STM8A product line targets cost-optimized, high-reliability automotive applications - specifically designed for engine management, chassis control, and body electronics where AEC-Q100 compliance and extended temperature operation are mandatory.
FAQ
What is the maximum operating junction temperature for STM8AF6268TCX?
The device is qualified per AEC-Q100 Grade 0 with maximum ambient operating temperature of +150 °C. Junction temperature depends on PCB thermal design and power dissipation, but the package (VFQFPN32) has θJA = 45 °C/W per datasheet Table 49, enabling safe operation up to ~165 °C junction under typical automotive airflow conditions.
Does STM8AF6268TCX support in-circuit debugging via SWIM?
Yes - it features Single Wire Interface Module (SWIM) debug interface on pin PE0 (SWIM), supporting full-speed programming, real-time register inspection, and breakpoint-based debugging using ST-LINK/V2 or compatible tools without requiring additional pins beyond reset and SWIM.
Can the internal 16 MHz RC oscillator be calibrated for improved accuracy?
Yes - the HSI oscillator supports user trimming via the CLK_HSITRIMR register (address 0x50C0), allowing ±1% frequency adjustment in 0.5% steps across VDD and temperature ranges, critical for LIN baud rate stability without external crystal.
How many LIN nodes can STM8AF6268TCX manage simultaneously?
The integrated LINUART supports only one physical LIN bus interface, but the MCU can operate as either master or slave on that single bus. Multi-node coordination requires external LIN transceivers per node; this device serves as one node - not a multi-channel gateway.
STM8AF6268TCX 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:
- 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:
STM8AF6268TCX FAQ
1.How can I place an order for STM8AF6268TCX through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF6268TCX 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 STM8AF6268TCX reliable?
The price and inventory of STM8AF6268TCX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF6268TCX is usually 5 days.
3.What payment methods are accepted for STM8AF6268TCX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF6268TCX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF6268TCX?
STM8AF6268TCX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF6268TCX 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 STM8AF6268TCX?
For technical support, including STM8AF6268TCX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF6268TCX requirements.
6.How does Aetrix verify that STM8AF6268TCX is sourced from the original manufacturer or authorized distributors?
All STM8AF6268TCX 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 STM8AF6268TCX meets industry standards.
7.What is the process for return or replacement of STM8AF6268TCX?
All STM8AF6268TCX units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF6268TCX, 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 STM8AF6268TCX part is unused and in its original packaging.
Return procedure for STM8AF6268TCX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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