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

STMicroelectronics STM8AF52A8TAX

Name: STM8AF52A8TAX
Brand: STMicroelectronics
SKU: STM8AF52A8TAX
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STM8AF52A8TAX

Manufacturer:: STMicroelectronics

Category:: Microcontrollers

Package:: 48-LQFP

Datasheet:: STM8AF52A8TAX.pdf

Description:: IC MCU 8BIT 128KB FLASH 48LQFP

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STM8AF52A8TAX 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, LIN 2.2, USART, SPI, I²C, and 10-bit ADC with 16-channel multiplexing - deployed in engine control units for real-time sensor signal acquisition and actuator command execution.

For engineers reviewing the STM8AF52A8TAX datasheet, STM8AF52A8TAX pinout, STM8AF52A8TAX application, or STM8AF52A8TAX equivalent, this page delivers verified technical context, validated pin functions, automotive-grade operating parameters (–40 °C to 150 °C), and direct alternative part comparisons - all grounded in ST's production datasheet DocID14395 Rev 15.

Technical Context

The STM8AF52A8TAX 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.

It embeds a dedicated beCAN interface compliant with ISO 11898-1, supporting bit rates up to 1 Mbit/s and full CAN 2.0B protocol handling; paired with LINUART supporting master/slave modes, automatic resynchronization, and LIN 2.2 compliance for vehicle body electronics communication stacks.

Key Specifications

Parameter	Value and Actual Design Meaning
Core Architecture	STM8A 8-bit Harvard CPU with 3-stage pipeline; enables deterministic 10 MIPS @ 16 MHz for hard real-time control loops.
Flash Memory	128 Kbyte on-chip Flash with 20-year data retention at 55 °C; supports in-application programming and read-out protection.
Data EEPROM	2 Kbyte true data EEPROM with 300 kcycle endurance; eliminates need for external nonvolatile storage in calibration-critical systems.
CAN Interface	High-speed CAN 2.0B controller (beCAN) supporting 1 Mbit/s; includes message filtering, FIFO buffering, and error confinement for automotive bus robustness.
ADC Resolution	10-bit SAR ADC with ±2 LSB total unadjusted error (TUE) and 1 LSB integral linearity; calibrated for precision analog sensing across –40 °C to 150 °C.
Operating Temperature	–40 °C to +150 °C ambient; qualified per AEC-Q100 Grade 0, enabling deployment in under-hood engine management modules.
I/O Count	Up to 68 user pins including 11 high-sink I/Os; designed for current injection immunity in noisy automotive environments.

Pinout & Package

LQFP64 package: 64-pin, 10 × 10 mm, 0.5 mm pitch, exposed thermal pad - optimized for thermal dissipation in high-temperature automotive PCB layouts.

Pin/Terminal	Circuit Role	Design Meaning
VDD, VSS	Power supply and ground	Dual power domains: VDD powers digital core and I/Os; VSS provides low-noise return path for analog peripherals including ADC reference.
PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7, PE0–PE7, PF0–PF7	General-purpose I/O ports	64 total GPIOs with configurable pull-up/pull-down, alternate function remapping, and high sink capability (20 mA) on 11 pins for direct LED/relay drive.
PD0/PD1	CAN TX/RX	Dedicated differential CAN transceiver interface pins; support direct connection to ISO 11898-compliant physical layer without level-shifting.
PA3/PA4	LIN UART TX/RX	Hardware LIN 2.2 transceiver interface with automatic baud rate resynchronization; enables single-wire communication with slave nodes in body control modules.
PC0–PC3	ADC IN0–IN3	Analog input channels with internal sampling capacitor; routed to 10-bit ADC with programmable prescaler and scan mode for multi-sensor polling.

Key Features

Feature	Design Value
AEC-Q100 Grade 0 qualification	Validated for continuous operation at 150 °C junction temperature - meets stringent reliability requirements for engine control, transmission, and exhaust aftertreatment systems.
Integrated clock security system (CSS)	Monitors HSE oscillator activity and triggers safe reset if failure detected - prevents undetected clock faults in safety-critical timing paths.
Advanced control timer (TIM1)	16-bit timer with 4 CAPCOM channels, 3 complementary outputs, and programmable dead-time insertion - enables precise 3-phase motor gate driving in electric power steering.
Low-power operating modes	Wait, Auto-wakeup, Halt, and Active-halt modes with selective peripheral clock gating - reduces current consumption to <1.5 µA in Halt mode for battery-backed wake-on-event applications.
Single-wire interface module (SWIM)	On-chip debug interface using single pin (SWIM) for full-speed programming and real-time debugging - eliminates JTAG header footprint and simplifies production test access.

Applications

Engine Control Unit (ECU)

Body Control Module (BCM)

Use Scenario: Real-time acquisition of crankshaft position, throttle angle, and coolant temperature; closed-loop fuel injection timing and spark advance calculation.

IC Role / Device Role / Timing Role: Primary MCU executing deterministic control algorithms with sub-millisecond interrupt latency; synchronizes PWM outputs to ignition coils and fuel injectors.

Use Value: 128 KB Flash stores complex combustion models; CAN interface enables seamless integration into vehicle-wide powertrain network with diagnostic message routing.

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

IC Role / Device Role / Timing Role: Master node on LIN bus coordinating slave devices; handles wake-up event detection, power sequencing, and fault logging.

Use Value: LINUART hardware acceleration ensures reliable frame-level synchronization across temperature extremes; 2 KB EEPROM retains user preferences and fault history without external memory.

Transmission Control Unit (TCU)

Exhaust Aftertreatment System

Use Scenario: Gear selection logic, clutch engagement timing, and torque converter lock-up control based on vehicle speed, engine load, and oil temperature.

IC Role / Device Role / Timing Role: Safety-relevant controller interfacing with CAN bus for torque request arbitration and gear position feedback; monitors critical sensors via 10-bit ADC.

Use Value: AEC-Q100 Grade 0 rating guarantees functional stability at 150 °C near transmission housing; advanced timers generate precise PWM for solenoid valve actuation.

Use Scenario: Monitoring NOx sensor output, diesel particulate filter (DPF) pressure drop, and exhaust gas temperature to trigger regeneration cycles.

IC Role / Device Role / Timing Role: Dedicated ADC channel scanning with oversampling and digital filtering; executes thermal management logic with watchdog supervision.

Use Value: High-accuracy 10-bit ADC (±2 LSB TUE) ensures reliable emission compliance decisions; CAN interface reports DPF status to engine ECU for coordinated regeneration scheduling.

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
STM8AF52A6TAY	64 Kbyte Flash, same 2 Kbyte EEPROM, identical pinout and peripheral set; lower memory density.	Suitable for cost-sensitive BCMs with reduced firmware footprint and no future OTA update requirement.	Select when application code size remains below 64 KB and long-term field updates are not required.
STM8AF62A8TAY	Same Flash/EEPROM size and package, but lacks CAN interface; retains LIN, USART, SPI, I²C, and 10-bit ADC.	Targeted at non-CAN body electronics (e.g., seat control, HVAC) where LIN or UART suffices for inter-node communication.	Choose when CAN bus connectivity is unnecessary and BOM cost reduction is prioritized over protocol flexibility.

Compared with STM8AF52A8TAX, STM8AF52A6TAY offers memory scaling without peripheral trade-offs, while STM8AF62A8TAY removes CAN to reduce silicon cost - both maintain AEC-Q100 Grade 0 qualification and identical thermal performance for under-hood deployment.

Availability

STM8AF52A8TAX is available at Aetrix Electronics and suitable for engine control units, transmission control modules, and exhaust aftertreatment systems requiring stable component supply across extended automotive lifecycles.

Supply support for STM8AF52A8TAX 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 analog products.

The STM8A automotive MCU product line targets cost-optimized, high-reliability embedded control in powertrain, chassis, and body electronics - emphasizing AEC-Q100 compliance, extended temperature operation, and integrated communication peripherals for vehicle network integration.

FAQ

What is the maximum operating frequency and voltage range for STM8AF52A8TAX?

The STM8AF52A8TAX operates at up to 24 MHz CPU frequency across a supply voltage range of 3.0 V to 5.5 V. Electrical characteristics are fully specified from –40 °C to +150 °C, with fCPUmax scaling linearly with VDD per Figure 11 in DocID14395 Rev 15 - e.g., 24 MHz achievable at VDD ≥ 4.5 V, 16 MHz guaranteed down to VDD = 3.0 V.

Does STM8AF52A8TAX support hardware-based 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 resynchronization. Hardware LIN framing, checksum generation, and break detection are handled autonomously, reducing CPU overhead during bus arbitration and node configuration.

How is flash memory protected against unauthorized access or corruption?

Protection is implemented via three mechanisms: Read-out Protection (ROP) levels disable external debugger access to Flash contents; Write Protection (WP) sectors prevent accidental overwrites; and User Boot Code (UBC) locking secures bootloader regions. All are configured via option bytes stored in dedicated memory locations and enforced by hardware during boot and runtime.

What debug interface does STM8AF52A8TAX use, and what are its capabilities?

It uses the Single Wire Interface Module (SWIM), a proprietary ST debug interface requiring only one dedicated pin. SWIM supports full-speed in-circuit programming, real-time variable inspection, breakpoint setting, and register read/write - all at full CPU speed without halting peripheral operation, enabling non-intrusive diagnostics in running automotive systems.

STM8AF52A8TAX Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 48-LQFP

Series:: STM8A

Packaging:: Tape & Reel (TR)

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:: 38

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 10x10b

Oscillator Type:: Internal

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:

STM8AF52A8TAX FAQ

1.How can I place an order for STM8AF52A8TAX through Aetrix?

Please submit a Request for Quotation (RFQ) for STM8AF52A8TAX 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 STM8AF52A8TAX reliable?

The price and inventory of STM8AF52A8TAX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF52A8TAX is usually 5 days.

3.What payment methods are accepted for STM8AF52A8TAX?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF52A8TAX transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STM8AF52A8TAX?

STM8AF52A8TAX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STM8AF52A8TAX 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 STM8AF52A8TAX?

For technical support, including STM8AF52A8TAX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF52A8TAX requirements.

6.How does Aetrix verify that STM8AF52A8TAX is sourced from the original manufacturer or authorized distributors?

All STM8AF52A8TAX 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 STM8AF52A8TAX meets industry standards.

7.What is the process for return or replacement of STM8AF52A8TAX?

All STM8AF52A8TAX units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF52A8TAX, 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 STM8AF52A8TAX part is unused and in its original packaging.

Return procedure for STM8AF52A8TAX:

1.Submit a request within 90 days.

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

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