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STMicroelectronics STM8AF6266UCY
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- Part No.:
- STM8AF6266UCY
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-VFQFN Exposed Pad
- Datasheet:
-
STM8AF6266UCY.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 32VFQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,684
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Product details
Overview
STM8AF6266UCY from STMicroelectronics is an AEC-Q100 qualified automotive 8-bit microcontroller featuring a 16 MHz STM8A core, 32 Kbyte Flash program memory, 1 Kbyte true data EEPROM, and integrated 10-bit ADC with up to 10 channels. It supports LIN 2.2, SPI (up to 8 Mbit/s), and I²C (up to 400 Kbit/s), and operates across -40 °C to 150 °C for engine control unit (ECU) and body electronics applications.
For engineers reviewing the STM8AF6266UCY datasheet, STM8AF6266UCY pinout, STM8AF6266UCY application, or STM8AF6266UCY equivalent, this page delivers verified technical context, validated pin functions, real-world automotive use cases, and confirmed alternative options for functional migration or supply continuity.
Technical Context
The STM8AF6266UCY implements a Harvard-architecture STM8A CPU with 3-stage pipeline, achieving 10 MIPS at 16 MHz and average 1.6 cycles/instruction. 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).
Interrupt handling uses a nested controller with 32 vectors and up to 34 external interrupts mapped across 5 vectors. Analog subsystem includes a 10-bit ADC with 2 LSB total unadjusted error, scan mode, analog watchdog, and individual data buffers per channel - all qualified for automotive-grade signal acquisition.
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 with 20-year data retention at 55 °C after 1 kcycle; supports in-system programming via SWIM. |
| Data EEPROM | 1 Kbyte true data EEPROM with 300 kcycle endurance; retains calibration data and configuration parameters across vehicle lifetime. |
| ADC Resolution | 10-bit SAR ADC with 2 LSB TUE accuracy and linearity; provides precise sensor readings for throttle position or coolant temperature. |
| Operating Temp | -40 °C to +150 °C ambient range; certified for under-hood automotive deployment without derating. |
| Communication | LINUART (LIN 2.2 compliant), SPI (8 Mbit/s), I²C (400 Kbit/s); enables direct integration into automotive sub-networks with minimal external components. |
| Supply Voltage | 3.0 V to 5.5 V operation; compatible with 5 V legacy automotive power rails and 3.3 V modern domains. |
Pinout & Package
STM8AF6266UCY is housed in a VFQFPN32 (5 × 5 mm, 0.5 mm pitch) package with 32 pins, optimized for high-density automotive PCB layouts and thermal performance in constrained spaces.
| 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 plane connection; separate analog ground not required due to internal isolation design. |
| NRST | Active-low reset input | Asynchronous reset pin with internal pull-up; accepts external reset IC or microcontroller-initiated recovery sequences. |
| PA0–PA7 | General-purpose I/O port A | 8-bit bidirectional port with HS capability; configurable as LINUART TX/RX, SPI SCK/MOSI/MISO, or ADC inputs. |
| PB0–PB7 | General-purpose I/O port B | 8-bit bidirectional port supporting TIM1/2/3/4 capture/compare, I²C SCL/SDA, and external interrupt sources. |
| PC0–PC7 | General-purpose I/O port C | 8-bit port with dedicated LINUART alternate function on PC3/PC4; supports high-current sink for LED indicators or solenoid drivers. |
| PD0–PD7 | General-purpose I/O port D | 8-bit port with ADC channel mapping (e.g., PD0 = ADC1_IN0); enables simultaneous analog sensing and digital control. |
| SWIM | Single-wire interface module | Debug and programming interface using single pin; allows full in-circuit debugging and firmware updates without JTAG overhead. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for 150 °C operation and automotive reliability standards including HTOL, ESD, and EMC compliance. |
| Advanced control timer (TIM1) | 16-bit timer with 4 CAPCOM channels, 3 complementary outputs, dead-time insertion, and synchronization - ideal for motor phase control. |
| Low-power modes | Wait, auto-wakeup, and Halt modes with user-definable clock gating; reduces current draw to <1.5 µA in Halt with RTC active. |
| Internal clock trimming | User-adjustable 16 MHz HSI oscillator; eliminates need for external crystal in cost-sensitive LIN nodes while maintaining ±2% frequency stability. |
| Analog watchdog | Configurable threshold monitoring per ADC channel; triggers interrupt on out-of-range sensor values - critical for safety-critical diagnostics. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Real-time monitoring of crankshaft position, throttle angle, and oxygen sensor feedback in gasoline/diesel engines. IC Role / Device Role / Timing Role: Primary MCU executing closed-loop fuel injection and ignition timing algorithms with sub-microsecond interrupt latency. Use Value: 16 MHz deterministic execution and 10-bit ADC with analog watchdog enable robust misfire detection and emissions compliance. |
Use Scenario: Centralized management of door locks, window lifts, interior lighting, and mirror adjustment in passenger vehicles. IC Role / Device Role / Timing Role: LIN master node coordinating slave modules (e.g., seat controllers, mirror ECUs) via standardized protocol stack. Use Value: Integrated LINUART with automatic resynchronization ensures reliable communication despite bus voltage transients and EMI in cabin environments. |
| Transmission Control Unit (TCU) | Heating/Ventilation/Air Conditioning (HVAC) |
Use Scenario: Gear selection logic, clutch pressure modulation, and torque converter lock-up control in automatic transmissions. IC Role / Device Role / Timing Role: High-reliability timing source for PWM-driven solenoid valves using advanced control timer with dead-time insertion. Use Value: 32 Kbyte Flash and 1 Kbyte EEPROM store adaptive shift maps and fault logs across 15+ year vehicle service life. |
Use Scenario: Blower motor speed regulation, temperature blending flap actuation, and refrigerant pressure monitoring in climate systems. IC Role / Device Role / Timing Role: Sensor fusion hub aggregating NTC thermistor, humidity, and pressure inputs via multiplexed 10-channel ADC. Use Value: 150 °C operating range permits placement near heater cores or compressor housings without thermal derating. |
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 |
|---|---|---|---|
| STM8AF6286UCY | 64 Kbyte Flash, 2 Kbyte RAM, same peripherals and pinout; higher memory headroom for complex diagnostics or OTA update buffers. | Preferred for next-gen ECUs requiring dual-bank Flash for safe firmware updates or expanded CAN/LIN gateway functionality. | Select when future-proofing against software bloat or adding bootloader features without changing PCB layout. |
| RL78/F13-BS | Renesas RL78 core, 32 Kbyte Flash, 2.7–5.5 V, -40 to 105 °C; lacks 150 °C rating and LIN 2.2 hardware acceleration. | Suitable for non-under-hood applications like infotainment interfaces or dashboard displays where extended temperature is not required. | Choose only for cost-sensitive cabin modules where AEC-Q100 Grade 1 suffices and LIN timing margins can be managed in firmware. |
Compared with STM8AF6266UCY, STM8AF6286UCY offers scalable memory without architectural change, while RL78/F13-BS trades temperature resilience and LIN hardware for lower power in less demanding zones - making the STM8AF6266UCY optimal for under-hood real-time control where thermal and protocol integrity are non-negotiable.
Availability
STM8AF6266UCY 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 STM8AF6266UCY 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 microcontroller family targets cost-sensitive, high-reliability embedded control applications - delivering AEC-Q100 qualified performance with integrated LIN, robust ADC, and extended temperature operation for under-hood and chassis systems.
FAQ
What is the maximum operating frequency and corresponding supply voltage range for STM8AF6266UCY?
The STM8AF6266UCY achieves a maximum CPU frequency of 16 MHz across its full 3.0 V to 5.5 V supply range, with fCPU vs. VDD curves confirming stable operation down to 3.0 V at 16 MHz per Figure 8 in DocID14952 Rev 11. No voltage scaling or frequency throttling is required within this envelope.
Does STM8AF6266UCY support hardware LIN 2.2 compliance, and what features enable it?
Yes - the integrated LINUART peripheral is fully LIN 2.2 compliant, supporting both master and slave modes with automatic resynchronization, break detection, sync field handling, and checksum generation. Hardware-level frame timing ensures ±1.5% baud rate tolerance over temperature and voltage, eliminating firmware-based timing loops.
How is debug and programming implemented on STM8AF6266UCY, and what tools are required?
Debug and programming use the Single-Wire Interface Module (SWIM) via the dedicated SWIM pin, enabling full in-circuit debugging, flash erase/write, and register inspection with ST-LINK/V2 or ST-LINK/V2-1 adapters. No external debugger header or JTAG interface is needed - reducing BOM count and board space.
What is the guaranteed data retention period for the embedded EEPROM, and under what conditions?
The 1 Kbyte true data EEPROM retains stored values for 20 years at 55 °C ambient after 1,000 program/erase cycles, as specified in Section 5.4.3 and Table 32 of the datasheet. This applies to standard automotive storage conditions and assumes proper write sequencing per the EEPROM programming procedure.
STM8AF6266UCY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-VFQFN Exposed Pad
- Series:
- STM8A
- Packaging:
- Tray
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- STM8A
- Core Size:
- 8-Bit
- Speed:
- 16MHz
- Connectivity:
- I2C, LINbus, SPI, UART/USART
- Peripherals:
- Brown-out Detect/Reset, POR, PWM, WDT
- Number of I/O:
- 25
- 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 7x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AF6266UCY FAQ
1.How can I place an order for STM8AF6266UCY through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF6266UCY 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 STM8AF6266UCY reliable?
The price and inventory of STM8AF6266UCY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF6266UCY is usually 5 days.
3.What payment methods are accepted for STM8AF6266UCY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF6266UCY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF6266UCY?
STM8AF6266UCY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF6266UCY 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 STM8AF6266UCY?
For technical support, including STM8AF6266UCY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF6266UCY requirements.
6.How does Aetrix verify that STM8AF6266UCY is sourced from the original manufacturer or authorized distributors?
All STM8AF6266UCY 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 STM8AF6266UCY meets industry standards.
7.What is the process for return or replacement of STM8AF6266UCY?
All STM8AF6266UCY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF6266UCY, 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 STM8AF6266UCY part is unused and in its original packaging.
Return procedure for STM8AF6266UCY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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