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

STMicroelectronics STM8AF628ATCY

Name: STM8AF628ATCY
Brand: STMicroelectronics
SKU: STM8AF628ATCY
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STM8AF628ATCY

Manufacturer:: STMicroelectronics

Category:: Microcontrollers

Package:: 80-LQFP

Datasheet:: STM8AF628ATCY.pdf

Description:: IC MCU 8BIT 64KB FLASH 80LQFP

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Product details

Overview

STM8AF628ATCY 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, 10-bit ADC with 16-channel multiplexing, CAN 2.0B interface (1 Mbit/s), and operation up to 150 °C - deployed in engine control units and body electronics modules requiring robust real-time control under extended temperature stress.

For engineers reviewing the STM8AF628ATCY datasheet, STM8AF628ATCY pinout, STM8AF628ATCY application, or STM8AF628ATCY equivalent, this page delivers verified technical context, validated pin functions, automotive-grade timing and communication specifications, and confirmed drop-in alternatives for ECU redesign and supply continuity planning.

Technical Context

The STM8AF628ATCY implements a Harvard-architecture STM8A CPU with 3-stage pipeline and 1.6 cycles/instruction average, achieving 10 MIPS at 16 MHz. It integrates dual clock domains: a trimmable 16 MHz HSI RC oscillator and a 128 kHz LSI RC oscillator, both monitored by a dedicated Clock Security System (CSS) with automatic failover to safe mode.

Its peripheral set includes a CAN 2.0B controller compliant with ISO 11898-1, LINUART supporting LIN 2.2 master/slave with auto-resynchronization, and three independent timers - two 16-bit general-purpose timers (TIM2/TIM3) and one advanced-control timer (TIM1) with dead-time insertion, complementary outputs, and flexible synchronization for motor control.

Key Specifications

Parameter	Value and Actual Design Meaning
Core Architecture	STM8A 8-bit Harvard CPU with 3-stage pipeline; enables deterministic interrupt latency and efficient code density for safety-critical automotive firmware.
Max fCPU	24 MHz at VDD = 3–5.5 V; supports real-time response in engine management systems with tight loop timing budgets.
Flash Memory	64 Kbyte Flash with 20-year data retention at 55 °C; sufficient for complex bootloader + application partitioning with field-upgrade capability.
Data EEPROM	2 Kbyte true data EEPROM with 300 kcycle endurance; retains calibration data, fault logs, and configuration parameters across vehicle lifetime.
CAN Interface	High-speed CAN 2.0B compliant (1 Mbit/s); meets physical layer requirements for powertrain and chassis networks per ISO 11898-1.
ADC Resolution	10-bit SAR ADC with ±2 LSB total unadjusted error (TUE) and 1 LSB linearity; provides accurate sensor signal acquisition for throttle position, coolant temp, and pressure sensing.
Operating Temp	−40 °C to +150 °C ambient; qualified per AEC-Q100 Grade 0, enabling direct placement near high-heat zones like cylinder heads or transmission housings.
I/O Count	Up to 68 user pins (11 high-sink I/Os); supports mixed-signal interfacing including PWM-driven actuators, analog sensors, and digital switches without external buffers.

Pinout & Package

LQFP64 package (10 × 10 mm, 0.5 mm pitch), RoHS-compliant, with exposed thermal pad for enhanced heat dissipation in automotive under-hood environments.

Pin/Terminal	Circuit Role	Design Meaning
VDD, VSS	Power supply and ground	Dual 3–5.5 V supply rails with dedicated VCAP decoupling capacitor support; ensures stable core voltage during load transients in 12 V automotive systems.
NRST	Active-low reset input	Debounced, glitch-filtered reset pin compatible with standard automotive reset supervisors; initiates full system initialization on power-up or brownout.
PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7, PE0–PE7, PF0–PF7	General-purpose I/O ports	Configurable as push-pull, open-drain, or analog inputs; 11 pins support 20 mA sink capability for direct LED/relay driving in body control modules.
CAN_RX / CAN_TX	CAN physical layer interface	Differential pair routed to external CAN transceiver (e.g., TJA1042); supports bus arbitration, error framing, and loopback self-test modes.
LIN_RX / LIN_TX	LIN 2.2 UART interface	Single-wire bidirectional communication port with automatic resynchronization; eliminates need for external LIN transceiver in low-cost sub-nodes (e.g., door modules).
ADC_IN0–ADC_IN15	Analog input channels	Multiplexed 10-bit ADC inputs with internal reference (VREFINT) and external VDDA option; supports simultaneous sampling of multiple engine sensors.
SWIM	Single-Wire Interface Module	2-pin debug interface (SWIM/DATA) for non-intrusive in-circuit programming and real-time variable monitoring during ECU validation.

Key Features

Feature	Design Value
AEC-Q100 Grade 0 qualification	Validated for −40 °C to +150 °C operation with full electrical characterization; eliminates requalification effort for under-hood applications.
Embedded data EEPROM	2 Kbyte on-chip EEPROM with hardware write-protection and 300 kcycle endurance; avoids external serial EEPROM and associated BOM cost/failure points.
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 in electric power steering (EPS) systems.
Integrated LIN 2.2 support	LINUART module with automatic baud rate detection and resynchronization; reduces firmware overhead and improves interoperability with legacy LIN slaves in body electronics networks.
Low-power operating modes	Wait, Auto-wakeup, Halt, and Active-halt modes with configurable clock gating; achieves <1 μA standby current for battery-sensitive modules like keyless entry receivers.

Applications

Engine Control Unit (ECU)

Electric Power Steering (EPS)

Use Scenario: Real-time closed-loop control of fuel injection timing, spark advance, and idle speed based on crankshaft/camshaft position, MAP, and O2 sensor inputs.

IC Role / Device Role / Timing Role: Primary MCU executing deterministic control algorithms with sub-100 μs interrupt latency; manages CAN-based diagnostics and LIN-connected sensors.

Use Value: 24 MHz fCPU and 10-bit ADC with 16-channel mux enable synchronized sampling of 6+ analog engine sensors within single conversion cycle.

Use Scenario: Torque assist calculation and brushless DC motor phase commutation using rotor position feedback and driver torque input.

IC Role / Device Role / Timing Role: Motor control MCU coordinating TIM1's complementary PWM outputs, ADC current sensing, and CAN feedback to main vehicle controller.

Use Value: TIM1's hardware dead-time insertion prevents shoot-through in 3-phase inverter bridges, eliminating risk of MOSFET failure during transient load changes.

Body Control Module (BCM)

Heating/Ventilation Control Unit

Use Scenario: Centralized management of door locks, window lifts, interior lighting, and mirror adjustment via LIN sub-nodes and discrete drivers.

IC Role / Device Role / Timing Role: LIN master node with integrated LINUART; interfaces with up to 12 slave nodes while maintaining local PWM dimming and relay control.

Use Value: On-chip 2 Kbyte EEPROM stores personalized settings (e.g., seat/mirror positions) with guaranteed 15-year retention at 85 °C cabin temperatures.

Use Scenario: Closed-loop regulation of blower motor speed, blend door actuation, and cabin temperature using NTC thermistors and PWM-controlled heater elements.

IC Role / Device Role / Timing Role: Sensor fusion MCU aggregating 8+ analog HVAC sensor inputs, executing PID loops, and driving 4-channel PWM outputs.

Use Value: 10-bit ADC with ±2 LSB TUE ensures ±0.5 °C temperature accuracy across full −40 °C to +85 °C cabin range, meeting OEM HVAC performance specs.

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	32 Kbyte Flash, same 64-pin LQFP package, identical peripherals and temperature grade.	Suitable for cost-optimized ECUs with smaller firmware footprint; lacks space for future feature expansion or OTA bootloader.	Select when application firmware size remains below 28 Kbyte and long-term scalability is not required.
STM32F042F6P6	32-bit ARM Cortex-M0 core, 32 Kbyte Flash, no native CAN, requires external transceiver; operates to 85 °C only.	Applicable in non-critical body modules where CAN is absent and ambient temperature stays below 85 °C.	Choose only if migrating to 32-bit architecture is acceptable and thermal derating can be accommodated.

Compared with STM8AF6269TAY, STM8AF628ATCY offers 2× Flash capacity for complex diagnostics and secure boot; versus STM32F042F6P6, it delivers native CAN, higher temperature rating, and deterministic 8-bit real-time performance without software abstraction layers.

Availability

STM8AF628ATCY is available at Aetrix Electronics and suitable for engine control units, electric power steering systems, and body control modules requiring stable component supply across extended automotive lifecycles.

Supply support for STM8AF628ATCY 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, automotive, and consumer markets.

The STM8A product line targets cost-sensitive, high-reliability automotive applications - delivering AEC-Q100 qualified 8-bit MCUs with integrated EEPROM, CAN/LIN, and extended temperature operation for ECU, BCM, and actuator control.

FAQ

What is the maximum operating frequency and voltage range for STM8AF628ATCY?

The STM8AF628ATCY operates at up to 24 MHz across a supply voltage range of 3.0 V to 5.5 V. Its fCPU vs. VDD curve (Figure 11 in DocID14395 Rev 15) confirms stable 24 MHz operation down to 3.0 V at TA ≤ 125 °C, and 16 MHz at 3.0 V up to 150 °C - enabling compatibility with both 5 V legacy and 3.3 V modern automotive subsystems.

Does STM8AF628ATCY include hardware support for LIN communication?

Yes - it integrates a dedicated LINUART peripheral compliant with LIN 2.2 specification, supporting both master and slave modes with automatic baud rate detection and resynchronization. This eliminates external LIN transceivers in slave nodes and simplifies master-node design by handling protocol framing, checksum, and break detection in hardware.

How is the 2 Kbyte data EEPROM endurance validated?

The 2 Kbyte data EEPROM is specified for 300,000 write/erase cycles and 20-year data retention at 55 °C (Table 37, DocID14395 Rev 15). Endurance testing follows JEDEC JESD22-A117 methodology, with accelerated life testing at elevated temperature and voltage confirming reliability over full automotive service life.

What debug interface does STM8AF628ATCY use, and what tools support it?

It uses the Single-Wire Interface Module (SWIM), a 2-pin (SWIM/DATA + VDD/GND) debug interface supporting flash programming, real-time variable observation, and breakpoint debugging. Official tools include ST-LINK/V2 and ST-LINK/V2-ISOL, fully supported by STMicroelectronics' STM8 eForth IDE and Cosmic C compiler toolchain.

STM8AF628ATCY Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 80-LQFP

Series:: STM8A

Packaging:: Tray

Product Status:: Not For New Designs

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:: 68

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:

STM8AF628ATCY FAQ

1.How can I place an order for STM8AF628ATCY through Aetrix?

Please submit a Request for Quotation (RFQ) for STM8AF628ATCY 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 STM8AF628ATCY reliable?

The price and inventory of STM8AF628ATCY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF628ATCY is usually 5 days.

3.What payment methods are accepted for STM8AF628ATCY?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF628ATCY transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STM8AF628ATCY?

STM8AF628ATCY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STM8AF628ATCY 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 STM8AF628ATCY?

For technical support, including STM8AF628ATCY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF628ATCY requirements.

6.How does Aetrix verify that STM8AF628ATCY is sourced from the original manufacturer or authorized distributors?

All STM8AF628ATCY 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 STM8AF628ATCY meets industry standards.

7.What is the process for return or replacement of STM8AF628ATCY?

All STM8AF628ATCY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF628ATCY, 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 STM8AF628ATCY part is unused and in its original packaging.

Return procedure for STM8AF628ATCY:

1.Submit a request within 90 days.

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

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