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

STMicroelectronics STM8AF52A9TAY

Name: STM8AF52A9TAY
Brand: STMicroelectronics
SKU: STM8AF52A9TAY
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STM8AF52A9TAY

Manufacturer:: STMicroelectronics

Category:: Microcontrollers

Package:: 64-LQFP

Datasheet:: STM8AF52A9TAY.pdf

Description:: IC MCU 8BIT 128KB FLASH 64LQFP

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Product details

Overview

STM8AF52A9TAY 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. It supports LIN 2.2-compliant communication, 10-bit ADC with 2 LSB TUE, and operates across -40 °C to 150 °C for engine control unit (ECU) and body electronics applications.

For engineers reviewing the STM8AF52A9TAY datasheet, STM8AF52A9TAY pinout, STM8AF52A9TAY application, or STM8AF52A9TAY equivalent, key selection criteria include automotive-grade temperature range (-40 °C to 150 °C), CAN/LIN coexistence capability, on-chip data EEPROM endurance, Flash retention lifetime, and high-sink I/O robustness against current injection.

Technical Context

The STM8AF52A9TAY implements a Harvard-architecture STM8A CPU with 3-stage pipeline and average 1.6 cycles/instruction execution, 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 dedicated beCAN controller compliant with ISO 11898-1, LINUART supporting master/slave modes with automatic resynchronization, and dual 16-bit general-purpose timers each with three CAPCOM channels-enabling precise PWM generation, input capture, and output compare functions in real-time automotive subsystems.

Key Specifications

Parameter	Value and Actual Design Meaning
Core Architecture	STM8A 8-bit Harvard CPU with 3-stage pipeline; enables deterministic timing for safety-critical automotive firmware.
Max fCPU	24 MHz; supports real-time response in ECU timing loops with guaranteed instruction latency.
Flash Memory	128 Kbyte; retains program code for 20 years at 55 °C - suitable for long-lifecycle vehicle platforms.
Data EEPROM	2 Kbyte true EEPROM; withstands 300,000 write/erase cycles for odometer, calibration, or fault log storage.
CAN Interface	CAN 2.0B compliant, 1 Mbit/s; enables direct connection to automotive CAN FD backbone without protocol translation.
ADC Resolution	10-bit with 2 LSB total unadjusted error; provides sufficient accuracy for sensor signal conditioning (e.g., coolant temp, throttle position).
Operating Temp	-40 °C to +150 °C; meets AEC-Q100 Grade 0 requirements for under-hood deployment.
I/O Count	Up to 68 user pins including 11 high-sink I/Os; supports direct drive of LEDs, relays, and discrete loads without external buffers.

Pinout & Package

LQFP80 package: 80-pin, 14 × 14 mm low-profile quad flat package with exposed thermal pad; RoHS-compliant, moisture sensitivity level 3.

Pin/Terminal	Circuit Role	Design Meaning
VDD	Power supply	Primary 3–5.5 V supply rail; decoupled via external 100 nF capacitor per VDD pin for EMC robustness.
VSS	Ground reference	Dedicated analog/digital ground pins; must be connected to low-impedance PCB plane to minimize noise coupling into ADC/CAN.
NRST	Reset input	Active-low reset with internal pull-up; accepts 1.2–5.5 V logic levels and supports external watchdog reset assertion.
PA0–PA7	General-purpose I/O	Configurable as digital input/output or alternate function (e.g., TIM1_CH1, ADC1_IN0); support high-sink capability (20 mA).
PB0–PB7	General-purpose I/O	Support LINUART TX/RX, SPI MOSI/MISO, and CAN RX/TX remapping; immune to current injection up to 100 mA.
PC0–PC7	General-purpose I/O	Enable timer capture/compare outputs (TIM2_CH1–CH3), I2C SCL/SDA, and USART TX/RX with configurable slew rate.
PD0–PD7	General-purpose I/O	Provide ADC channel inputs (ADC1_IN8–IN15), beeper output, and auto-wakeup timer trigger signals.
PE0–PE7	General-purpose I/O	Support advanced control timer complementary outputs (TIM1_CH1N–CH3N) with programmable dead-time insertion.
PF0–PF7	General-purpose I/O	Enable SPI NSS, I2C SMBA, and SWIM debug interface; retain functionality in low-power halt mode.
PG0–PG7	General-purpose I/O	Map to CAN TX/RX, LINUART TX/RX, and USART clock output; support synchronous LIN bus operation.

Key Features

Feature	Design Value
AEC-Q100 Grade 0 qualification	Validated for continuous operation at 150 °C ambient - eliminates derating calculations for under-hood ECU designs.
Integrated CAN 2.0B controller	Hardware message filtering, transmit/receive FIFOs, and error handling reduce CPU overhead by >40% vs. software-implemented CAN stacks.
LIN 2.2-compliant UART	Automatic baud rate resynchronization and master/slave mode enable plug-and-play integration with LIN slave nodes (e.g., door modules).
True data EEPROM	2 Kbyte nonvolatile memory with 300 kcycle endurance - replaces external serial EEPROM in cost-sensitive body control modules.
Advanced control timer (TIM1)	16-bit counter with 4 CAPCOM channels, 3 complementary outputs, and hardware dead-time insertion for BLDC motor gate driving.
Low-power operating modes	Wait/auto-wakeup/halt modes with selective peripheral clock gating reduce active current to 230 µA @ 4 MHz (VDD = 3.3 V, TA = 25 °C).

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 analog sensor inputs and PWM-controlled actuators.

IC Role / Device Role / Timing Role: Primary MCU executing closed-loop control algorithms with sub-microsecond interrupt latency and deterministic CAN message scheduling.

Use Value: 10-bit ADC with 2 LSB TUE ensures accurate air-fuel ratio calculation; CAN 2.0B interface synchronizes with transmission control unit at 500 kbit/s.

Use Scenario: Centralized control of lighting, window lift, mirror adjustment, and door lock functions across multiple LIN sub-nodes.

IC Role / Device Role / Timing Role: LIN master coordinating polling-based communication with up to 16 slave devices while managing local I/O and EEPROM-based configuration storage.

Use Value: Integrated LINUART eliminates external transceiver; 2 Kbyte data EEPROM stores user preferences and fault codes without external memory.

Transmission Control Unit (TCU)

Electric Power Steering (EPS)

Use Scenario: Gear shift logic, clutch engagement control, and torque converter lockup management using CAN messages from ECU and wheel speed sensors.

IC Role / Device Role / Timing Role: Safety-relevant controller with watchdog supervision, clock security monitoring, and fail-safe output drivers for solenoid valve control.

Use Value: AEC-Q100 Grade 0 rating ensures reliability at 150 °C; advanced control timer generates synchronized PWM for proportional pressure valves.

Use Scenario: Torque assist computation, motor phase commutation, and steering angle feedback processing in brushless DC motor-driven systems.

IC Role / Device Role / Timing Role: Real-time motor controller interfacing with Hall sensors, current shunts, and CAN bus for vehicle dynamics coordination.

Use Value: 16-bit advanced control timer with dead-time insertion prevents shoot-through in 3-phase inverter bridges; CAN interface reports status to ADAS domain controller.

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
STM8AF62A9TAY	No CAN interface; retains LIN, SPI, I2C, 10-bit ADC, and same Flash/EEPROM specs.	Suitable for LIN-only body electronics where CAN connectivity is unnecessary.	Select when CAN is not required - reduces BOM cost and simplifies EMC layout by removing CAN transceiver and termination network.
MC9S08DZ60CLCR	Freescale (NXP) S08 core; 60 Kbyte Flash, 4 Kbyte RAM, no integrated data EEPROM, CAN 2.0A only.	Legacy platform migration path with toolchain compatibility but lower Flash density and no true EEPROM.	Choose only for existing S08-based designs requiring drop-in replacement; lacks 128 Kbyte Flash and 2 Kbyte EEPROM needed for new ECU firmware features.

Compared with STM8AF62A9TAY, the STM8AF52A9TAY adds essential CAN 2.0B support for powertrain networking, while MC9S08DZ60CLCR offers legacy toolchain continuity but sacrifices EEPROM endurance and Flash capacity critical for modern diagnostic logging and OTA update storage.

Availability

STM8AF52A9TAY 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 lifecycles.

Supply support for STM8AF52A9TAY 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 management ICs, sensors, and automotive-grade silicon.

The STM8AF series targets automotive applications demanding AEC-Q100 qualification, extended temperature operation, and integrated CAN/LIN interfaces - specifically engineered for cost-sensitive, safety-aware ECU and body electronics designs.

FAQ

What is the maximum operating temperature for STM8AF52A9TAY?

The STM8AF52A9TAY is rated for continuous operation from -40 °C to +150 °C ambient temperature and is AEC-Q100 Grade 0 qualified. This specification is validated per test condition JESD22-A108, with thermal characterization confirming junction temperature limits remain within safe margins under full peripheral load at 150 °C ambient.

Does STM8AF52A9TAY include on-chip debug capability?

Yes, the STM8AF52A9TAY integrates a Single Wire Interface Module (SWIM) supporting non-intrusive in-circuit debugging and programming via a single pin (SWIM). It enables full read/write access to Flash, EEPROM, and registers, breakpoint setting, and real-time variable monitoring without halting CPU execution during SWIM session.

How many CAN message objects does the beCAN controller support?

The beCAN controller in STM8AF52A9TAY supports 16 message objects with individual acceptance filtering, configurable as transmit or receive buffers. Each object includes identifier masking, data length control, and priority arbitration - enabling concurrent handling of engine, transmission, and chassis CAN messages without CPU polling overhead.

Is external memory required for firmware updates over CAN?

No, external memory is not required. The 128 Kbyte Flash supports dual-bank operation with user boot code (UBC) protection, enabling safe in-application programming (IAP) of new firmware via CAN bootloader. Verified CRC checks and write-protection bits ensure integrity during field updates without external SPI Flash dependency.

STM8AF52A9TAY 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:: 128KB (128K 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 ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:

STM8AF52A9TAY FAQ

1.How can I place an order for STM8AF52A9TAY through Aetrix?

Please submit a Request for Quotation (RFQ) for STM8AF52A9TAY 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 STM8AF52A9TAY reliable?

The price and inventory of STM8AF52A9TAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF52A9TAY is usually 5 days.

3.What payment methods are accepted for STM8AF52A9TAY?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF52A9TAY transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STM8AF52A9TAY?

STM8AF52A9TAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STM8AF52A9TAY 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 STM8AF52A9TAY?

For technical support, including STM8AF52A9TAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF52A9TAY requirements.

6.How does Aetrix verify that STM8AF52A9TAY is sourced from the original manufacturer or authorized distributors?

All STM8AF52A9TAY 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 STM8AF52A9TAY meets industry standards.

7.What is the process for return or replacement of STM8AF52A9TAY?

All STM8AF52A9TAY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF52A9TAY, 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 STM8AF52A9TAY part is unused and in its original packaging.

Return procedure for STM8AF52A9TAY:

1.Submit a request within 90 days.

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

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