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STMicroelectronics STM8AF6266TCY
- Part No.:
- STM8AF6266TCY
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 32-LQFP
- Datasheet:
-
STM8AF6266TCY.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 32LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:8,735
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Product details
Overview
STM8AF6266TCY from STMicroelectronics is an AEC-Q100 qualified automotive 8-bit microcontroller featuring a 16 MHz STM8A core, 32 Kbyte Flash 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 -40 to 150 °C in engine control modules.
For engineers reviewing the STM8AF6266TCY datasheet, STM8AF6266TCY pinout, STM8AF6266TCY application, or STM8AF6266TCY equivalent, this part delivers deterministic real-time control for safety-critical automotive subsystems requiring extended temperature operation, robust I/O immunity, and LIN bus integration without external transceivers.
Technical Context
The STM8AF6266TCY implements a Harvard-architecture STM8A CPU with 3-stage pipeline and average 1.6 cycles/instruction throughput, enabling 10 MIPS at 16 MHz. Its clock system integrates user-trimmable 16 MHz HSI and low-power 128 kHz LSI oscillators, plus crystal/resonator support and clock security monitoring.
Interrupt handling uses a nested controller with 32 vectors and up to 34 external interrupts mapped across 5 priority levels. Analog functionality centers on a 10-bit ADC with individual channel buffers, analog watchdog, and scan/continuous sampling modes-fully synchronized with timer-triggered conversions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8A 8-bit Harvard core with 3-stage pipeline; enables deterministic 10 MIPS @ 16 MHz for time-critical engine timing loops. |
| Flash Memory | 32 Kbyte program Flash; retains data ≥20 years at 55 °C after 1,000 erase/write cycles-suitable for field-updatable calibration tables. |
| Data EEPROM | 1 Kbyte true data EEPROM; rated for 300,000 write/erase cycles-supports durable storage of odometer, fault logs, or adaptive learning parameters. |
| ADC Resolution & Accuracy | 10-bit SAR ADC with 2 LSB total unadjusted error (TUE); ensures ±0.2% measurement fidelity for throttle position or coolant temperature sensing. |
| LIN Interface | LINUART peripheral compliant with LIN 2.2 spec; supports master/slave modes with automatic resynchronization-eliminates need for external LIN transceiver in body control units. |
| Operating Temperature | -40 to +150 °C ambient range; validated per AEC-Q100 Grade 0-enables direct placement in under-hood ECUs without heatsinking. |
| I/O Robustness | Up to 38 user pins including 10 high-speed I/Os; immune to current injection per ISO 11452-4-reduces susceptibility to EMI in noisy vehicle harness environments. |
Pinout & Package
STM8AF6266TCY is housed in a VFQFPN32 (5 × 5 mm, 0.5 mm pitch) package with exposed thermal pad for enhanced heat dissipation in compact automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Power supply input | Primary 3–5.5 V supply rail; decoupled via external 100 nF capacitor to stabilize core voltage during transient load switching. |
| VSS | Ground reference | Digital ground plane connection; requires low-inductance path to minimize noise coupling into ADC and clock circuits. |
| NRST | Active-low reset input | Asynchronous reset pin with internal pull-up; accepts external RC network for power-on reset timing compliance with ISO 16750-2. |
| PA0–PA7 | General-purpose I/O port A | 8-bit bidirectional port with configurable pull-ups; supports alternate functions including TIM1/2 channels and ADC inputs. |
| PB0–PB7 | General-purpose I/O port B | 8-bit port with high-sink capability; used for LINUART TX/RX, SPI SCK/MOSI/MISO, and I²C SCL/SDA multiplexing. |
| PC0–PC7 | General-purpose I/O port C | 8-bit port supporting advanced timer complementary outputs and dead-time insertion-critical for motor gate drive control. |
| PD0–PD7 | General-purpose I/O port D | 8-bit port with analog input capability; routes up to 10 ADC channels and supports beeper/timer output functions. |
| VCAP | Capacitor connection for internal regulator | Connects external 1 µF ceramic capacitor to stabilize internal 1.8 V core voltage-mandatory for reliable 16 MHz operation. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for continuous operation from -40 to +150 °C-meets automotive under-hood thermal requirements without derating. |
| Integrated LIN 2.2 UART | Hardware LIN protocol stack with automatic sync-break detection and checksum generation-reduces firmware overhead by >40% vs software-only implementations. |
| Advanced Control Timer (TIM1) | 16-bit timer with 4 CAPCOM channels, 3 complementary outputs, and programmable dead-time insertion-enables precise 3-phase motor commutation control. |
| True data EEPROM | 1 Kbyte nonvolatile memory with 300 kcycle endurance and byte-level erase-supports secure storage of cryptographic keys or calibration offsets without Flash wear leveling. |
| Low-power operating modes | Wait, Auto-wakeup, and Halt modes with selective clock gating-reduces current consumption to <1 µA in Halt mode while retaining RAM and register state. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
|
Use Scenario: Real-time management of fuel injection timing, ignition spark advance, and knock detection using crank/cam sensor inputs. IC Role / Device Role / Timing Role: Primary MCU executing closed-loop combustion control algorithms with sub-microsecond interrupt latency and synchronized ADC sampling. Use Value: 16 MHz deterministic execution and 10-bit ADC with analog watchdog ensure precise air-fuel ratio control under wide temperature and voltage variation. |
Use Scenario: Centralized control of door locks, window lifts, lighting sequences, and LIN-connected sensors (e.g., rain/light sensors). IC Role / Device Role / Timing Role: LIN master node coordinating distributed slave nodes while managing local I/O and PWM dimming for LED interior lighting. Use Value: Integrated LINUART eliminates external transceiver, reducing BOM cost and PCB area; 150 °C rating allows placement near fuse boxes or junction blocks. |
| Transmission Control Unit (TCU) | Heating/Ventilation/Air Conditioning (HVAC) |
|
Use Scenario: Gear selection logic, solenoid driver control, and torque converter clutch management using pressure and temperature feedback. IC Role / Device Role / Timing Role: Safety-relevant controller interfacing with CAN gateway and driving high-current solenoids via external drivers. Use Value: Robust I/O design withstands current injection from inductive load switching; embedded watchdog timers meet ASIL-B diagnostic coverage requirements. |
Use Scenario: Blower motor speed regulation, blend door actuation, and cabin temperature feedback processing in automotive HVAC systems. IC Role / Device Role / Timing Role: Dedicated HVAC controller managing multi-speed DC blower via PWM and stepper motor drivers for air flap positioning. Use Value: Advanced control timer provides precise dead-time controlled complementary outputs for half-bridge motor drivers; 10-bit ADC resolves thermistor-based temperature readings to ±0.5 °C. |
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 |
|---|---|---|---|
| STM8AF6268TCY | Same core, Flash, and peripherals but in LQFP48 package with 48 pins and expanded I/O count (up to 38 GPIO vs 32 on VFQFPN32). | Preferred where board layout requires larger pitch or additional dedicated debug/reset pins not available on VFQFPN32. | Select when needing more routing flexibility or legacy footprint compatibility; identical firmware and peripheral register map. |
| RL78/F13 | Renesas RL78 core (16-bit), 32 Kbyte Flash, 2.7–5.5 V supply, but lacks native LIN 2.2 hardware and operates only to 125 °C. | Suitable for non-under-hood applications like infotainment sub-modules where extended temperature is not required. | Choose only if migrating to Renesas ecosystem; requires full firmware rewrite and external LIN transceiver integration. |
Compared with STM8AF6266TCY, the STM8AF6268TCY offers identical functionality in a larger LQFP48 package for easier prototyping and debug access, while the RL78/F13 demands significant software rework and cannot replace it in high-temperature LIN master roles without added components.
Availability
STM8AF6266TCY is available at Aetrix Electronics and suitable for engine control units, body control modules, transmission control units, and HVAC systems requiring stable component supply across automotive production lifecycles.
Supply support for STM8AF6266TCY 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 specializing in automotive, industrial, and power management solutions, with over 40 years of microcontroller innovation.
The STM8A automotive MCU product line targets cost-sensitive, high-reliability embedded control applications-including powertrain, chassis, and body electronics-where AEC-Q100 qualification and extended temperature operation are mandatory.
FAQ
What is the maximum operating frequency and corresponding supply voltage range for STM8AF6266TCY?
The STM8AF6266TCY achieves a maximum CPU frequency of 16 MHz across its full 3.0–5.5 V supply range, verified per electrical characteristics Table 21. At 3.0 V, fCPUmax is 12 MHz; at 5.5 V, it sustains 16 MHz with guaranteed timing margins. This scalability allows dynamic voltage/frequency scaling in low-power modes without clock tree redesign.
Does STM8AF6266TCY require an external LIN transceiver for LIN bus communication?
No. The integrated LINUART peripheral complies fully with LIN 2.2 specification-including automatic resynchronization, checksum generation, and break detection-enabling direct connection to the LIN bus via a single external 12 V pull-up resistor and transient protection diode. No external transceiver IC is needed for basic master or slave operation.
How is the 1 Kbyte data EEPROM organized and accessed in STM8AF6266TCY?
The 1 Kbyte data EEPROM is physically separate from Flash memory and addressed in the 0x4000–0x43FF range. It supports byte/word/segment erase and program operations via dedicated EEPROM control registers (FLASH_IAPSR, FLASH_PUKR, FLASH_DUKR). Access requires unlocking sequence and wait-state insertion per datasheet Section 5.4.
What thermal management provisions exist for the VFQFPN32 package of STM8AF6266TCY?
The VFQFPN32 package features an exposed thermal pad (EPAD) on the underside, which must be soldered to a dedicated copper pour on the PCB for effective heat conduction. Thermal resistance θJA is 49 °C/W (JEDEC standard board), and θJC is 12.5 °C/W-requiring minimum 200 mm² EPAD copper area with ≥4 thermal vias to internal ground planes for sustained 150 °C operation.
STM8AF6266TCY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 32-LQFP
- 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:
STM8AF6266TCY FAQ
1.How can I place an order for STM8AF6266TCY through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF6266TCY 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 STM8AF6266TCY reliable?
The price and inventory of STM8AF6266TCY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF6266TCY is usually 5 days.
3.What payment methods are accepted for STM8AF6266TCY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF6266TCY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF6266TCY?
STM8AF6266TCY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF6266TCY 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 STM8AF6266TCY?
For technical support, including STM8AF6266TCY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF6266TCY requirements.
6.How does Aetrix verify that STM8AF6266TCY is sourced from the original manufacturer or authorized distributors?
All STM8AF6266TCY 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 STM8AF6266TCY meets industry standards.
7.What is the process for return or replacement of STM8AF6266TCY?
All STM8AF6266TCY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF6266TCY, 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 STM8AF6266TCY part is unused and in its original packaging.
Return procedure for STM8AF6266TCY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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