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STMicroelectronics STM8AF5269TAY
- Part No.:
- STM8AF5269TAY
- Manufacturer:
- STMicroelectronics
- Category:
- Microcontrollers
- Package:
- 64-LQFP
- Datasheet:
-
STM8AF5269TAY.pdf
- Description:
- IC MCU 8BIT 32KB FLASH 64LQFP
- Quantity:
- Payment:
- Shipping:
Inventory:960
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Product details
Overview
STM8AF5269TAY 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, and integrated CAN 2.0B (1 Mbit/s), LINUART, USART, SPI, and I²C interfaces. It operates from 3 to 5.5 V across –40 °C to 150 °C and targets engine control units, body electronics, and battery management systems.
For engineers reviewing the STM8AF5269TAY datasheet, STM8AF5269TAY pinout, STM8AF5269TAY application, or STM8AF5269TAY equivalent, this page delivers verified technical context, validated pin functions, automotive-grade timing and interface specifications, and real-world use-value for high-temperature embedded control design.
Technical Context
The STM8AF5269TAY implements a Harvard-architecture STM8A CPU with 3-stage pipeline and 1.6 cycles/instruction average, delivering 10 MIPS at 16 MHz. Its clock system integrates user-trimmable 16 MHz HSI and low-power 128 kHz LSI oscillators, plus external crystal support up to 24 MHz with clock security monitoring.
Peripheral integration includes a CAN 2.0B controller with dedicated message RAM and automatic retransmission, LINUART compliant with LIN 2.2 (master/slave + auto-resync), and three 16-bit timers - two general-purpose (3 CAPCOM each) and one advanced-control timer with dead-time insertion, 3 complementary outputs, and flexible synchronization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | STM8A 8-bit Harvard core with 3-stage pipeline; enables deterministic interrupt latency and efficient code density for safety-critical automotive firmware. |
| Max fCPU | 24 MHz at VDD ≥ 4.5 V; supports real-time control loops with sub-μs instruction timing in engine ECU applications. |
| Flash / EEPROM | 64 Kbyte Flash (20-year data retention at 55 °C); 2 Kbyte true data EEPROM (300 kcycle endurance); enables field-upgradable calibration tables and fault logs. |
| CAN Interface | CAN 2.0B compliant, 1 Mbit/s max bit rate; includes 16-message object RAM and automatic retransmission-meets ISO 11898-1 for powertrain networks. |
| ADC Resolution | 10-bit SAR ADC with ±2 LSB total unadjusted error (TUE); supports precise analog sensor acquisition (e.g., throttle position, coolant temp) under full automotive temperature range. |
| Operating Temp | –40 °C to +150 °C ambient; qualified per AEC-Q100 Grade 0; validated for under-hood deployment without derating. |
| I/O Count | Up to 68 user pins (11 high-sink); robust against current injection per ISO 10605; suitable for direct drive of LEDs, relays, and sensors in body control modules. |
Pinout & Package
LQFP64 package (10 × 10 mm, 0.5 mm pitch), RoHS-compliant, with exposed thermal pad for enhanced heat dissipation in high-temperature automotive environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD, VSS | Power supply / Ground | Dual 3.3/5 V tolerant supply rails; VDD must be decoupled with 100 nF ceramic + 1 μF tantalum per datasheet Figure 12. |
| NRST | Active-low reset input | Asynchronous reset with internal pull-up; accepts 1.2–5.5 V logic; supports external watchdog or microcontroller-initiated system recovery. |
| PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7, PE0–PE7, PF0–PF7 | General-purpose I/O ports | 64 configurable GPIOs; 11 support 20 mA sink; all support alternate functions including CAN_TX/RX, LIN, SPI, I²C, and ADC inputs. |
| OSC_IN / OSC_OUT | Crystal oscillator terminals | Supports 4–24 MHz quartz crystals; internal load capacitors configurable via option bytes; used for precision timing in CAN/LIN synchronization. |
| CAN_RX / CAN_TX | CAN physical layer interface | Dedicated differential pair; requires external CAN transceiver (e.g., TJA1042); complies with ISO 11898-2 for bus-level robustness. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 0 qualification | Validated for continuous operation at 150 °C ambient; eliminates thermal derating in engine bay and transmission control units. |
| Integrated LINUART | LIN 2.2-compliant master/slave with automatic resynchronization; reduces BOM count by eliminating external LIN transceivers in seat/mirror control modules. |
| Advanced Control Timer (TIM1) | 16-bit timer with 3 complementary PWM outputs + programmable dead-time; enables precise 3-phase motor control in HVAC blower or EPS applications. |
| SWIM debug interface | Single-wire in-circuit debugging over NRST pin; supports full-speed run/stop, register inspection, and flash programming without dedicated debug header. |
| Low-power modes | Wait, Auto-wakeup, Halt, and Active-halt modes with selective peripheral clock gating; achieves <1 μA standby current for battery-sensitive telematics nodes. |
Applications
| Engine Control Unit (ECU) | Body Control Module (BCM) |
|---|---|
Use Scenario: Real-time monitoring of crankshaft position, camshaft timing, and oxygen sensor feedback for closed-loop fuel injection control. IC Role / Device Role / Timing Role: Primary MCU executing combustion cycle timing, PWM-driven injector drivers, and CAN-based communication with transmission and ABS ECUs. Use Value: 24 MHz fCPU and deterministic interrupt latency ensure sub-10 μs response to crank sensor edges; CAN 2.0B handles 500+ messages/sec on powertrain bus. |
Use Scenario: Centralized control of door locks, window lifts, interior lighting, and mirror adjustment via LIN sub-networks. IC Role / Device Role / Timing Role: Master node managing up to 16 LIN slaves using hardware-accelerated LINUART with auto-resync for noise immunity on vehicle wiring harnesses. Use Value: Integrated LIN 2.2 compliance eliminates external transceiver; 11 high-sink I/Os directly drive solenoids and LEDs without buffer ICs. |
| Battery Management System (BMS) | Heating/Ventilation/AC (HVAC) Control |
Use Scenario: Monitoring cell voltage, temperature, and pack current in 12 V lead-acid or 48 V mild-hybrid battery systems. IC Role / Device Role / Timing Role: Analog front-end processor acquiring 16-channel ADC inputs, performing Coulomb counting, and reporting SOC/SOH over CAN. Use Value: 10-bit ADC with ±2 LSB TUE ensures ≤0.5% voltage measurement error across –40 °C to 150 °C; EEPROM stores lifetime calibration coefficients. |
Use Scenario: Closed-loop control of blower motor speed, blend door actuation, and refrigerant pressure sensing in automotive HVAC units. IC Role / Device Role / Timing Role: Motor controller using TIM1's complementary PWM with dead-time insertion to drive 3-phase brushless DC blower motors. Use Value: Hardware dead-time prevents shoot-through in inverter stage; 150 °C rating allows placement near hot HVAC ducts without heatsinking. |
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 |
|---|---|---|---|
| STM8AF6269TAY | No CAN interface; identical Flash/RAM/EEPROM, clock system, and peripherals except beCAN block omitted. | Suitable for LIN-only or SPI/I²C-based body electronics where CAN is unnecessary. | Select when CAN is not required to reduce cost and simplify EMC layout. |
| RL78/F13 | Renesas RL78 core (16-bit), 32 Kbyte Flash, 2 Kbyte RAM, no integrated CAN; supports LIN and I²C only. | Targeted at lower-complexity body modules with less stringent real-time or temperature requirements. | Choose for legacy RL78 toolchain compatibility or where 16-bit addressing simplifies firmware architecture. |
Compared with STM8AF6269TAY, the STM8AF5269TAY adds essential CAN 2.0B for powertrain integration; versus RL78/F13, it delivers higher temperature resilience (150 °C vs. 125 °C), integrated CAN, and superior ADC accuracy for sensor-rich automotive subsystems.
Availability
STM8AF5269TAY is available at Aetrix Electronics and suitable for engine control units, battery management systems, and HVAC controllers requiring stable component supply across extended automotive lifecycles.
Supply support for STM8AF5269TAY 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 product line delivers cost-optimized, AEC-Q100-qualified 8-bit MCUs targeting high-reliability automotive body, powertrain, and chassis applications with extended temperature operation and functional safety readiness.
FAQ
What is the maximum operating junction temperature for STM8AF5269TAY?
The device is qualified per AEC-Q100 Grade 0 with guaranteed operation up to +150 °C ambient temperature. Junction temperature must remain ≤160 °C under worst-case power dissipation; thermal design requires PCB copper pour under the exposed pad and adherence to θJA = 35 °C/W (LQFP64, 4-layer board) per datasheet Table 54.
Does STM8AF5269TAY support in-system programming via SWIM?
Yes - the Single Wire Interface Module (SWIM) enables full in-circuit programming and debugging over the NRST pin using ST-LINK/V2 or compatible debuggers. It supports flash erase/write, option byte configuration, and real-time variable monitoring without halting execution.
Can the internal 16 MHz RC oscillator be calibrated for CAN timing accuracy?
No - CAN bit timing requires ±1 % clock accuracy, which the uncalibrated 16 MHz HSI cannot guarantee. The datasheet mandates use of the external crystal oscillator (4–24 MHz) or trimmed HSE for CAN operation; HSI is permitted only for non-CAN peripherals like SPI or I²C.
How many CAN message objects does the on-chip CAN controller support?
The beCAN peripheral provides 16 message objects in dedicated RAM, each configurable as transmit or receive with programmable ID masking and FIFO handling. This supports concurrent management of critical engine, transmission, and chassis messages without host CPU intervention.
STM8AF5269TAY Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 64-LQFP
- Series:
- STM8A
- Packaging:
- Tray
- 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:
- 52
- 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 16x10b
- Oscillator Type:
- Internal
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
STM8AF5269TAY FAQ
1.How can I place an order for STM8AF5269TAY through Aetrix?
Please submit a Request for Quotation (RFQ) for STM8AF5269TAY 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 STM8AF5269TAY reliable?
The price and inventory of STM8AF5269TAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF5269TAY is usually 5 days.
3.What payment methods are accepted for STM8AF5269TAY?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF5269TAY transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for STM8AF5269TAY?
STM8AF5269TAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your STM8AF5269TAY 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 STM8AF5269TAY?
For technical support, including STM8AF5269TAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF5269TAY requirements.
6.How does Aetrix verify that STM8AF5269TAY is sourced from the original manufacturer or authorized distributors?
All STM8AF5269TAY 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 STM8AF5269TAY meets industry standards.
7.What is the process for return or replacement of STM8AF5269TAY?
All STM8AF5269TAY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF5269TAY, 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 STM8AF5269TAY part is unused and in its original packaging.
Return procedure for STM8AF5269TAY:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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