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

STMicroelectronics STM8AF52A8TAY

Name: STM8AF52A8TAY
Brand: STMicroelectronics
SKU: STM8AF52A8TAY
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STM8AF52A8TAY

Manufacturer:: STMicroelectronics

Category:: Microcontrollers

Package:: 48-LQFP

Datasheet:: STM8AF52A8TAY.pdf

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

Quantity:: RFQ Add To RFQ list

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Product details

Overview

STM8AF52A8TAY 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 STM8AF52A8TAY datasheet, STM8AF52A8TAY pinout, STM8AF52A8TAY application, or STM8AF52A8TAY equivalent, key selection criteria include CAN/LIN coexistence, 150 °C extended temperature operation, 10-bit ADC with 2 LSB TUE, and high-sink I/O capability for direct solenoid drive in under-hood automotive modules.

Technical Context

The device implements a Harvard-architecture STM8A CPU with 3-stage pipeline and 1.6 cycles/instruction average, enabling 10 MIPS at 16 MHz. It integrates dual clock domains: a user-trimmable 16 MHz RC oscillator and a low-power 128 kHz RC source, both monitored by a dedicated clock security system (CSS) with automatic failover detection.

Peripheral subsystems are clock-gated via two independent registers (CLK_PCKENR1/2), supporting selective power-down of CAN, ADC, timers, and communication interfaces. The advanced control timer (TIM1) provides 3 complementary PWM outputs with programmable dead-time insertion - critical for three-phase motor gate driving in electric power steering systems.

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 firmware.
Max fCPU	24 MHz at 3–5.5 V supply; supports real-time control loops with sub-42 ns instruction cycle time.
Flash Memory	128 Kbyte with 20-year data retention at 55 °C; includes read-out protection (ROP) and write protection (WP) for secure bootloader storage.
Data EEPROM	2 Kbyte true EEPROM with 300 kcycle endurance; retains calibration data across vehicle lifetime without external NV memory.
CAN Interface	CAN 2.0B compliant, 1 Mbit/s max bit rate; supports error confinement and bus-off recovery required for ISO 11898-1 automotive networks.
ADC Resolution	10-bit SAR ADC with 2 LSB total unadjusted error (TUE); delivers ±0.2% measurement accuracy for throttle position and coolant temperature sensing.
Operating Temp	−40 °C to +150 °C ambient; validated per AEC-Q100 Grade 0 for under-hood placement without thermal derating.
I/O Count	Up to 68 user pins including 11 high-sink I/Os (20 mA sink @ 5 V); drives resistive loads like fuel injectors directly without external drivers.

Pinout & Package

LQFP64 package (10 × 10 mm, 0.5 mm pitch) with exposed thermal pad; RoHS-compliant, moisture sensitivity level MSL3.

Pin/Terminal	Circuit Role	Design Meaning
VDD, VSS	Power supply and ground	Dual 3–5.5 V supply domain with internal voltage regulator; supports wide-range battery input during cold-crank (4.5 V min).
PA0–PA7, PB0–PB7, PC0–PC7, PD0–PD7, PE0–PE7, PF0–PF7	General-purpose I/O	68 total user pins; 11 support 20 mA sink current for direct solenoid/LED load control; all support interrupt-on-change.
PD4/PD5	CAN_H/CAN_L	Differential CAN transceiver interface; internally terminated; compatible with ISO 11898-2 physical layer without external bias resistors.
PA3/PA4	LIN_TX/LIN_RX	Single-wire LIN 2.2 master/slave interface with auto-resynchronization; eliminates need for external LIN transceiver in body control modules.
PC0–PC3	ADC_IN0–ADC_IN3	Four dedicated analog inputs with 16-channel multiplexing; supports simultaneous sampling for multi-sensor diagnostics.
PF7	SWIM	Single-wire interface for programming and debug; enables in-system firmware updates without JTAG header footprint.

Key Features

Feature	Design Value
AEC-Q100 Grade 0 qualification	Validated for −40 °C to +150 °C operation with full electrical characterization across temperature and voltage extremes.
Integrated CAN + LIN	Co-located CAN 2.0B and LINUART peripherals enable hierarchical network architecture - CAN for powertrain, LIN for sensors/actuators - reducing BOM count.
True data EEPROM	2 Kbyte on-chip EEPROM with 300 kcycle endurance eliminates need for external serial EEPROM, simplifying PCB layout and improving reliability.
Advanced control timer (TIM1)	16-bit timer with 3 complementary PWM outputs and programmable dead-time insertion - enables precise gate driving for BLDC motors in EPS systems.
High-sink I/O capability	11 pins rated for 20 mA sink at 5 V; directly interfaces with automotive-grade solenoids, relays, and indicator LEDs without discrete driver ICs.
Low-power modes	Wait, Auto-wakeup, Halt, and Active-halt modes with configurable clock gating; achieves <1 μA standby current for always-on LIN wake-up functionality.

Applications

Engine Control Unit (ECU)

Electric Power Steering (EPS)

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-compliant control algorithms with deterministic 100 μs interrupt latency for spark advance computation.

Use Value: 150 °C rating allows direct mounting on ECU housing near engine bay; CAN interface synchronizes with transmission and ABS ECUs over high-speed backbone.

Use Scenario: Torque assist calculation using steering angle, vehicle speed, and motor current feedback; generation of 3-phase PWM for brushless motor drive.

IC Role / Device Role / Timing Role: Master controller managing motor commutation via TIM1's complementary PWM with dead-time control and fault protection.

Use Value: Integrated 10-bit ADC with 2 LSB TUE ensures ±0.5° steering angle resolution; high-sink I/Os drive motor phase enable lines directly.

Body Control Module (BCM)

Transmission Control Unit (TCU)

Use Scenario: Centralized management of door locks, window lifts, lighting, and climate actuators via LIN sub-networks.

IC Role / Device Role / Timing Role: LIN master coordinating up to 16 slave nodes with automatic resynchronization; handles wake-up via LIN header detection.

Use Value: Single-chip LIN/CAN integration reduces inter-module cabling; SWIM debug interface enables field firmware updates without disassembly.

Use Scenario: Gear shift logic, clutch pressure control, and torque converter lock-up management using turbine speed, oil temperature, and throttle position inputs.

IC Role / Device Role / Timing Role: Safety-relevant controller implementing ISO 26262 ASIL-B decomposition; monitors CAN bus health and performs fail-safe state transitions.

Use Value: AEC-Q100 Grade 0 qualification ensures functional integrity during thermal transients; 2 Kbyte EEPROM stores adaptive shift calibration across service intervals.

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
STM8AF62A8TAY	No CAN interface; identical Flash/EEPROM/RAM, same 150 °C rating and LIN capability.	Suitable for LIN-only body electronics where CAN backbone is absent or handled by separate gateway MCU.	Select when CAN is unnecessary and cost reduction is prioritized without sacrificing temperature or memory specs.
R5F10PLGCLFB	Renesas RL78/G14 core; 32 MHz max, 128 Kbyte Flash, no integrated CAN; requires external CAN transceiver.	Used in Japanese OEM BCMs with legacy RL78 toolchain dependency; lacks AEC-Q100 Grade 0 validation.	Choose only if existing RL78 software ecosystem mandates continuity; verify thermal validation for 150 °C operation independently.

Compared with STM8AF62A8TAY, the STM8AF52A8TAY adds essential CAN 2.0B for powertrain integration, while R5F10PLGCLFB requires external CAN hardware and lacks Grade 0 certification - making STM8AF52A8TAY the sole option for ASIL-B-compliant, CAN-enabled under-hood control.

Availability

STM8AF52A8TAY is available at Aetrix Electronics and suitable for engine control units, electric power steering systems, body control modules, and transmission control units requiring stable component supply across automotive production lifecycles.

Supply support for STM8AF52A8TAY 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 STM8A automotive MCU product line targets cost-sensitive, high-reliability applications in powertrain, chassis, and body electronics - emphasizing AEC-Q100 compliance, extended temperature operation, and integrated communication peripherals to reduce system-level BOM.

FAQ

What is the maximum ambient temperature rating for STM8AF52A8TAY?

The STM8AF52A8TAY is qualified per AEC-Q100 Grade 0 with guaranteed operation from −40 °C to +150 °C ambient temperature. Electrical parameters are fully characterized across this range, including Flash write/erase endurance and ADC accuracy, enabling direct placement in high-heat zones such as engine compartments without heatsinking.

Does STM8AF52A8TAY support in-circuit debugging without JTAG?

Yes - it uses the Single Wire Interface Module (SWIM), a 1-pin debug interface accessible via PF7. SWIM supports full-speed programming, real-time variable inspection, and breakpoint setting through ST-LINK/V2 or compatible debuggers, eliminating the need for a 4-pin JTAG header and saving PCB space in space-constrained automotive modules.

How is CAN bus fault tolerance implemented in this MCU?

The integrated beCAN peripheral includes bus-off recovery with automatic re-synchronization, error frame generation, and configurable error counters. It complies with ISO 11898-1 and supports silent mode for self-test. No external CAN transceiver is required for basic operation, though external transceivers (e.g., TJA1042) are used for enhanced EMC robustness in production systems.

Can the 2 Kbyte data EEPROM be used for OTA firmware update storage?

Yes - the true data EEPROM supports byte-wise erase/write with 300 kcycle endurance and 20-year data retention at 55 °C. It is commonly used to store firmware version metadata, cryptographic keys, and update staging buffers in secure OTA architectures, provided wear-leveling is implemented in application firmware to distribute write cycles across pages.

STM8AF52A8TAY Specifications

Product attributes: Attribute value

Manufacturer:: STMicroelectronics

Package/Case:: 48-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:: 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:

STM8AF52A8TAY FAQ

1.How can I place an order for STM8AF52A8TAY through Aetrix?

Please submit a Request for Quotation (RFQ) for STM8AF52A8TAY 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 STM8AF52A8TAY reliable?

The price and inventory of STM8AF52A8TAY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF52A8TAY is usually 5 days.

3.What payment methods are accepted for STM8AF52A8TAY?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF52A8TAY transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STM8AF52A8TAY?

STM8AF52A8TAY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STM8AF52A8TAY 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 STM8AF52A8TAY?

For technical support, including STM8AF52A8TAY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF52A8TAY requirements.

6.How does Aetrix verify that STM8AF52A8TAY is sourced from the original manufacturer or authorized distributors?

All STM8AF52A8TAY 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 STM8AF52A8TAY meets industry standards.

7.What is the process for return or replacement of STM8AF52A8TAY?

All STM8AF52A8TAY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF52A8TAY, 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 STM8AF52A8TAY part is unused and in its original packaging.

Return procedure for STM8AF52A8TAY:

1.Submit a request within 90 days.

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

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