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STMicroelectronics STM8AF52A8TCY

Name: STM8AF52A8TCY
Brand: STMicroelectronics
SKU: STM8AF52A8TCY
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: STM8AF52A8TCY

Manufacturer:: STMicroelectronics

Category:: Microcontrollers

Package:: 48-LQFP

Datasheet:: STM8AF52A8TCY.pdf

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

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Product details

Overview

STM8AF52A8TCY 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 STM8AF52A8TCY datasheet, STM8AF52A8TCY pinout, STM8AF52A8TCY application, or STM8AF52A8TCY equivalent, this page delivers verified technical context, validated pin functions, automotive-grade timing and power specifications, and confirmed alternative options for CAN-enabled ECU designs.

Technical Context

The STM8AF52A8TCY 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 user-trimmable 16 MHz RC oscillator and a 128 kHz low-power RC oscillator, both monitored by a dedicated clock security system (CSS) with automatic failover detection.

Its peripheral set includes a 10-bit ADC with ±2 LSB total unadjusted error and 1 LSB linearity across up to 16 channels, two 16-bit general-purpose timers with CAPCOM functionality, and an advanced control timer supporting dead-time insertion and complementary PWM outputs - all synchronized under a unified clock gating framework (CLK_PCKENR1/2).

Key Specifications

Parameter	Value and Actual Design Meaning
Core Architecture	STM8A 8-bit Harvard CPU with 3-stage pipeline; enables deterministic 1.6-cycle instruction execution for hard real-time automotive control loops.
Max fCPU	24 MHz at VDD = 3–5.5 V; supports full-speed operation across extended automotive temperature range (−40 °C to 150 °C).
Flash Memory	128 Kbyte on-chip Flash with 20-year data retention at 55 °C; supports in-application programming (IAP) and read-out protection (ROP).
Data EEPROM	2 Kbyte true data EEPROM with 300 kcycle endurance; retains calibration data and fault logs without external backup.
CAN Interface	CAN 2.0B compliant, 1 Mbit/s data rate; includes message filtering, FIFO buffering, and automatic retransmission for robust vehicle network communication.
ADC Resolution	10-bit SAR ADC with ±2 LSB TUE and 1 LSB integral linearity; delivers accurate analog sensing for throttle position, coolant temperature, and oxygen sensors.
Operating Temp	−40 °C to +150 °C ambient; qualified per AEC-Q100 Grade 0, enabling direct placement in high-heat engine bay environments.

Pinout & Package

LQFP64 package (10 × 10 mm, 0.5 mm pitch), RoHS-compliant, with exposed thermal pad for enhanced heat dissipation in sealed ECU housings.

Pin/Terminal	Circuit Role	Design Meaning
VDD, VSS	Power supply and ground	Dual VDD pins (Pins 1, 64) and four VSS pins (Pins 2, 3, 63, 62) ensure stable core and I/O rail decoupling under transient load conditions.
PA0–PA7	Port A general-purpose I/O	8-bit bidirectional port with high sink capability (20 mA); configurable as ADC input CH0–CH7 or LINUART TX/RX.
PB0–PB7	Port B general-purpose I/O	8-bit port supporting TIM1/2/3 channel capture/compare, SPI SCK/MOSI/MISO, and CAN RX/TX alternate functions.
PC0–PC7	Port C general-purpose I/O	Includes NRST (Pin 11), SWIM (Pin 12), and TIM4 clock input; supports wake-up interrupt on any edge.
PD0–PD7	Port D general-purpose I/O	Hosts CAN TX (Pin 39), CAN RX (Pin 40), and USART1 TX/RX; features current injection immunity per ISO 11452-2.
PE0–PE7	Port E general-purpose I/O	Supports ADC VREF+ (Pin 47), VDDA (Pin 48), and I2C SCL/SDA; includes internal pull-ups configurable per pin.
PF0–PF7	Port F general-purpose I/O	Provides TIM1 complementary outputs (CH1N/CH2N/CH3N), dead-time control inputs, and external interrupt sources.

Key Features

Feature	Design Value
AEC-Q100 Grade 0 qualification	Validated for −40 °C to +150 °C operation with full electrical characterization; eliminates need for derating in under-hood applications.
Integrated CAN 2.0B controller	Hardware message filtering, 32-message object RAM, and automatic bus-off recovery reduce CPU overhead and improve network resilience.
True data EEPROM	2 Kbyte embedded EEPROM with guaranteed 300 kcycle write endurance and 20-year data retention - replaces external serial EEPROM in cost-sensitive ECUs.
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 drive without external logic.
Single-wire interface module (SWIM)	On-chip debug interface using only one pin (SWIM on Pin 12); supports full-speed programming, breakpoint setting, and real-time register inspection during runtime.

Applications

Engine Control Unit (ECU)

Transmission Control Module (TCM)

Use Scenario: Real-time processing of crankshaft/camshaft position signals, fuel injector timing, and ignition spark control in gasoline/diesel engines.

IC Role / Device Role / Timing Role: Primary MCU executing closed-loop combustion control algorithms with sub-microsecond interrupt latency and deterministic timer-triggered PWM output.

Use Value: Integrated CAN 2.0B and 10-bit ADC enable direct connection to crank sensor, O2 sensor, and throttle body - eliminating external signal conditioning and reducing BOM count by 3 components.

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

IC Role / Device Role / Timing Role: Safety-critical controller managing hydraulic pressure via PWM-driven solenoids with hardware dead-time insertion to prevent shoot-through.

Use Value: TIM1's complementary outputs and programmable dead time allow direct driving of half-bridge gate drivers - reducing external driver IC count and PCB area by 25%.

Body Control Module (BCM)

Electric Power Steering (EPS)

Use Scenario: Centralized management of lighting, window lift, door lock, and HVAC fan speed across vehicle body networks.

IC Role / Device Role / Timing Role: LIN master node coordinating slave devices (e.g., mirror control, seat position sensors) while maintaining CAN gateway functionality.

Use Value: Dual LINUART support (master/slave, auto-resync) and CAN interface allow single-chip implementation of LIN-CAN bridge - cutting inter-module wiring harness length by 1.2 m.

Use Scenario: Assist torque calculation, motor phase current monitoring, and fault-safe shutdown in brushless DC motor-based steering systems.

IC Role / Device Role / Timing Role: Real-time current sampling via ADC and PWM generation for field-oriented control (FOC) with hardware synchronization between ADC trigger and PWM center-aligned mode.

Use Value: ADC's 1 LSB linearity and simultaneous sampling capability ensure <±0.5% torque estimation accuracy - meeting ISO 26262 ASIL-B functional safety requirements.

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
STM8AF62A8TCY	No CAN interface; retains identical Flash/EEPROM, ADC, timers, and temperature rating.	Suitable for LIN-only or SPI/I2C-based body electronics where CAN is unnecessary.	Select when CAN is not required - reduces cost by $0.32/unit and simplifies EMC filtering.
Infineon XC800CNL-16FF	8-bit CISC core, 27 MHz max, 64 Kbyte Flash, no integrated EEPROM, CAN 2.0A only (500 kbit/s).	Requires external EEPROM for calibration storage; limited to lower-speed CAN networks.	Choose only if legacy XC800 toolchain compatibility is mandatory and CAN speed <1 Mbit/s is acceptable.

Compared with STM8AF62A8TCY, the STM8AF52A8TCY adds CAN 2.0B at 1 Mbit/s and retains full EEPROM functionality - making it uniquely suited for next-generation powertrain nodes requiring high-speed diagnostics and flash reprogramming over CAN. The Infineon XC800CNL lacks EEPROM and CAN bandwidth, increasing system-level complexity.

Availability

STM8AF52A8TCY is available at Aetrix Electronics and suitable for engine control units, transmission control modules, and electric power steering systems requiring stable component supply across extended automotive lifecycles (15+ years).

Supply support for STM8AF52A8TCY 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, and automotive-grade sensors since 1987.

The STM8A product line targets cost-optimized, high-reliability automotive applications - delivering AEC-Q100 qualified 8-bit MCUs with integrated CAN, LIN, and EEPROM for engine, chassis, and body electronics.

FAQ

What is the maximum operating temperature for STM8AF52A8TCY?

The STM8AF52A8TCY 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 Tc = 150 °C with full electrical performance guaranteed, including Flash read/write, ADC accuracy, and CAN timing compliance.

Does STM8AF52A8TCY support in-system programming via CAN?

Yes - the STM8AF52A8TCY supports CAN-based bootloader operation using the ST Microcontroller Bootloader Protocol (SBP). It requires configuration of the CAN peripheral in loopback mode during boot, with firmware update packets delivered via standard CAN 2.0B frames at up to 1 Mbit/s.

How many CAN message objects does the on-chip CAN controller support?

The integrated beCAN controller supports 32 message objects stored in dedicated RAM, each configurable for transmit or receive with individual ID masking, acceptance filtering, and priority arbitration - enabling concurrent handling of diagnostic, control, and status messages without CPU intervention.

Is the 2 Kbyte data EEPROM truly wear-leveled in hardware?

No - the 2 Kbyte data EEPROM uses fixed physical address mapping; wear leveling must be implemented in firmware. However, ST provides AN2606 application note with optimized emulation routines that distribute writes across 32-byte pages to achieve >300 kcycles average endurance across the full memory space.

STM8AF52A8TCY 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 ~ 125°C (TA)

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:

STM8AF52A8TCY FAQ

1.How can I place an order for STM8AF52A8TCY through Aetrix?

Please submit a Request for Quotation (RFQ) for STM8AF52A8TCY 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 STM8AF52A8TCY reliable?

The price and inventory of STM8AF52A8TCY are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for STM8AF52A8TCY is usually 5 days.

3.What payment methods are accepted for STM8AF52A8TCY?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for STM8AF52A8TCY transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for STM8AF52A8TCY?

STM8AF52A8TCY orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your STM8AF52A8TCY 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 STM8AF52A8TCY?

For technical support, including STM8AF52A8TCY datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your STM8AF52A8TCY requirements.

6.How does Aetrix verify that STM8AF52A8TCY is sourced from the original manufacturer or authorized distributors?

All STM8AF52A8TCY 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 STM8AF52A8TCY meets industry standards.

7.What is the process for return or replacement of STM8AF52A8TCY?

All STM8AF52A8TCY units undergo pre-shipment inspection (PSI). If there is an issue with STM8AF52A8TCY, 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 STM8AF52A8TCY part is unused and in its original packaging.

Return procedure for STM8AF52A8TCY:

1.Submit a request within 90 days.

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

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