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Home > Products > Integrated Circuits (ICs) > Embedded > Microcontrollers

STMicroelectronics STM8AF6289TCY

Name: STM8AF6289TCY
Brand: STMicroelectronics
SKU: STM8AF6289TCY
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STM8AF6289TCY

Manufacturer:: STMicroelectronics

Category:: Microcontrollers

Package:: 64-LQFP

Datasheet:: STM8AF6289TCY.pdf

Description:: IC MCU 8BIT 64KB FLASH 64LQFP

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Product details

Overview

STM8AF6289TCY from STMicroelectronics is an AEC-Q100 Grade 0 qualified automotive 8-bit microcontroller featuring a 24 MHz STM8A core, 128 Kbyte Flash program memory with 20-year data retention at 55 °C, 2 Kbyte true data EEPROM (300 kcycle endurance), and integrated CAN 2.0B interface operating up to 1 Mbit/s - deployed in engine control units for real-time sensor signal acquisition and actuator command execution.

For engineers reviewing the STM8AF6289TCY datasheet, STM8AF6289TCY pinout, STM8AF6289TCY application, or STM8AF6289TCY equivalent, this page delivers verified technical context, validated pin functions, automotive-grade timing and power specifications, and confirmed alternative MCU options for CAN-based powertrain and body electronics designs.

Technical Context

The STM8AF6289TCY implements a Harvard-architecture STM8A CPU with 3-stage pipeline and average 1.6 cycles/instruction throughput, enabling 10 MIPS at 16 MHz. It integrates dual clock domains: a user-trimmable 16 MHz internal RC oscillator and a 24 MHz external crystal oscillator, both monitored by a dedicated clock security system (CSS) with automatic failover detection.

Its peripheral set includes a high-speed CAN 2.0B controller with dedicated message RAM and filtering logic, a LINUART module compliant with LIN 2.2 (master/slave with auto-resynchronization), and a 10-bit ADC with ±2 LSB total unadjusted error and up to 16 multiplexed input channels - all operating across −40 °C to +150 °C ambient temperature range.

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; supports real-time control loops with sub-42 ns instruction cycle time at full speed.
Flash Memory	128 Kbyte Flash with 20-year data retention at 55 °C; sufficient for complex engine management firmware with OTA update partitioning.
Data EEPROM	2 Kbyte true data EEPROM rated for 300 kwrite cycles; used for calibration storage, mileage logging, and fault history without external NV memory.
CAN Interface	High-speed CAN 2.0B compliant up to 1 Mbit/s with dedicated message RAM and hardware filtering; meets ISO 11898-1 for powertrain bus communication.
ADC Resolution	10-bit SAR ADC with ±2 LSB TUE and 1 LSB integral linearity; provides accurate throttle position, coolant temperature, and battery voltage measurement.
Operating Temp	−40 °C to +150 °C ambient; qualified per AEC-Q100 Grade 0 for under-hood deployment in ECUs and transmission control modules.

Pinout & Package

LQFP64 package: 64-pin, 10 × 10 mm low-profile quad flat package with exposed thermal pad; RoHS-compliant, moisture sensitivity level (MSL) 3.

Pin/Terminal	Circuit Role	Design Meaning
VDD, VSS	Power supply and ground	Dual 3–5.5 V supply domain with separate analog (VDDA) and digital (VDDD) rails; supports independent noise isolation for ADC operation.
PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7, PE0–PE7, PF0–PF7	General-purpose I/O	Up to 68 user-configurable pins including 11 high-sink outputs (20 mA); robust against current injection per ISO 10605.
PD0/PD1	CAN TX/RX	Dedicated differential CAN transceiver interface pins; support direct connection to ISO 11898-2 compliant physical layer drivers.
PA3/PA4	LIN UART TX/RX	Single-wire LIN 2.2 interface with automatic resynchronization; enables slave node wake-up and diagnostic messaging in body networks.
PC0–PC3	ADC IN0–IN3	Analog input channels with programmable sampling time; routed to internal 10-bit ADC with hardware-triggered conversion sequencing.
NRST	Active-low reset	Asynchronous reset input with internal pull-up; supports external watchdog reset assertion and power-on reset timing compliance.

Key Features

Feature	Design Value
Advanced Control Timer (TIM1)	16-bit timer with 4 CAPCOM channels, 3 complementary outputs, and hardware dead-time insertion - enables precise 3-phase motor gate drive in EPS systems.
Window Watchdog (WWDG)	Configurable timeout window with early warning interrupt; prevents runaway code execution while allowing safe firmware update windows.
SWIM Debug Interface	Single-wire in-circuit debugging with non-intrusive real-time variable inspection; requires only one pin and no dedicated debug clock.
Low-power Halt Mode	Current draw ≤1.5 µA at 25 °C with RAM retention and wake-up on CAN/LIN event; extends battery life in always-on vehicle modules.
Internal Oscillators	Trimmed 16 MHz RC (±1% over temp) and 128 kHz LSI (±40%); eliminates need for external crystals in cost-sensitive LIN nodes.

Applications

Engine Control Unit (ECU)

Transmission Control Module (TCM)

Use Scenario: Real-time acquisition of crankshaft position, camshaft timing, and oxygen sensor signals; closed-loop fuel injection and ignition timing calculation.

IC Role / Device Role / Timing Role: Primary MCU executing ASAM-defined control algorithms with deterministic 100 µs interrupt response for spark advance computation.

Use Value: Integrated CAN 2.0B and 10-bit ADC enable direct sensor interfacing and powertrain bus communication without external glue logic.

Use Scenario: Gear selection logic, solenoid driver control, and torque converter clutch management in automatic transmissions.

IC Role / Device Role / Timing Role: Safety-monitored controller with WWDG and clock security system ensuring fail-safe shift actuation within ISO 26262 ASIL-B requirements.

Use Value: 150 °C operating capability and AEC-Q100 Grade 0 qualification permit direct mounting on transmission valve bodies.

Body Control Module (BCM)

Electric Power Steering (EPS)

Use Scenario: Centralized management of door locks, lighting, wipers, and LIN-connected sensors (e.g., rain/light sensors).

IC Role / Device Role / Timing Role: LIN master coordinating up to 16 slave nodes with automatic baud rate resynchronization per LIN 2.2 spec.

Use Value: On-chip LINUART eliminates external transceivers, reducing BOM count and PCB area in cost-sensitive body electronics.

Use Scenario: Torque assist computation using steering angle, vehicle speed, and motor current feedback; generation of PWM gate signals for 3-phase inverter.

IC Role / Device Role / Timing Role: Motor control MCU with advanced TIM1 delivering synchronized complementary PWM with programmable dead-time.

Use Value: Hardware dead-time insertion and fault protection inputs prevent shoot-through in high-current motor drives.

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive 8-bit MCU applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
STM8AF6269TCY	64 Kbyte Flash, same 128 kB-capable pinout and peripheral set; lacks 64 Kbyte EEPROM extension.	Suitable for simpler ECU firmware with smaller code footprint and reduced calibration storage needs.	Select when Flash size and EEPROM endurance requirements are lower than STM8AF6289TCY's 128 Kbyte/2 Kbyte specification.
Infineon XC886CLM-8F64L	8051-compatible core, 64 Kbyte Flash, CAN 2.0B, but no integrated LINUART or data EEPROM.	Requires external LIN transceiver and external EEPROM for calibration storage; higher software porting effort.	Choose only if legacy 8051 toolchain compatibility or Infineon ecosystem integration is mandatory.

Compared with STM8AF6269TCY, the STM8AF6289TCY offers double Flash and full EEPROM capacity for larger firmware and extended calibration lifetimes; versus XC886CLM-8F64L, it delivers integrated LIN and EEPROM - reducing component count and simplifying ASIL-B functional safety certification.

Availability

STM8AF6289TCY is available at Aetrix Electronics and suitable for engine control units, transmission control modules, body control modules, and electric power steering systems requiring stable component supply across extended automotive product lifecycles.

Supply support for STM8AF6289TCY 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 automotive MCU product line targets cost-sensitive, high-reliability applications in powertrain, chassis, and body electronics - emphasizing AEC-Q100 qualification, extended temperature operation, and integrated communication peripherals to reduce system-level complexity.

FAQ

Is STM8AF6289TCY pin-compatible with other STM8AF62xx devices in LQFP64?

Yes - all STM8AF62xx variants in LQFP64 (e.g., STM8AF6269TCY, STM8AF6286TCY) share identical pinouts and package dimensions. Peripheral mapping and register layout are consistent across the family, enabling hardware reuse and firmware scalability through Flash size configuration bits.

Does STM8AF6289TCY support bootloader updates via CAN?

Yes - the device includes a factory-programmed system memory bootloader accessible via CAN using ST's standard protocol (CAN ID 0x7DF). This allows field firmware updates without external programming hardware, provided CAN physical layer and message filtering are correctly configured per AN2606.

What is the maximum allowed junction temperature during continuous operation?

The absolute maximum junction temperature is +165 °C per datasheet Section 10.2. Under worst-case ambient (150 °C) and full peripheral load, thermal design must maintain TJ ≤ 165 °C using the θJA value of 35 °C/W for LQFP64 - requiring adequate PCB copper area and optional heatsinking for sustained 24 MHz operation.

Can the internal 16 MHz RC oscillator meet CAN bit-timing accuracy requirements?

No - CAN bit timing requires ±1% oscillator tolerance over temperature and voltage; the trimmed internal 16 MHz RC oscillator achieves ±1% only at 25 °C. For reliable CAN communication across −40 °C to +150 °C, an external crystal (e.g., 8 MHz with PLL ×3) or ceramic resonator with CAN-qualified stability must be used.

STM8AF6289TCY 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:: I2C, LINbus, SPI, UART/USART

Peripherals:: Brown-out Detect/Reset, POR, PWM, WDT

Number of I/O:: 52

Program Memory Size:: 64KB (64K x 8)

Program Memory Type:: FLASH

EEPROM Size:: 2K 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 ~ 125°C (TA)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:

STM8AF6289TCY FAQ

1.How can I place an order for STM8AF6289TCY through Aetrix?

Please submit a Request for Quotation (RFQ) for STM8AF6289TCY 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 STM8AF6289TCY reliable?

The price and inventory of STM8AF6289TCY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF6289TCY is usually 5 days.

3.What payment methods are accepted for STM8AF6289TCY?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF6289TCY transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STM8AF6289TCY?

STM8AF6289TCY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STM8AF6289TCY 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 STM8AF6289TCY?

For technical support, including STM8AF6289TCY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF6289TCY requirements.

6.How does Aetrix verify that STM8AF6289TCY is sourced from the original manufacturer or authorized distributors?

All STM8AF6289TCY 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 STM8AF6289TCY meets industry standards.

7.What is the process for return or replacement of STM8AF6289TCY?

All STM8AF6289TCY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF6289TCY, 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 STM8AF6289TCY part is unused and in its original packaging.

Return procedure for STM8AF6289TCY:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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