STMicroelectronics STM8AF52A8TDY

Overview

STM8AF52A8TDY 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 STM8AF52A8TDY datasheet, STM8AF52A8TDY pinout, STM8AF52A8TDY application, or STM8AF52A8TDY equivalent, key selection criteria include automotive-grade temperature range (−40 °C to 150 °C), on-chip LINUART (LIN 2.2 compliant master/slave), 10-bit ADC with 16 multiplexed channels and 2 LSB total unadjusted error, and dual 16-bit general-purpose timers with CAPCOM functionality.

Technical Context

The STM8AF52A8TDY implements a Harvard-architecture STM8A CPU with 3-stage pipeline and average 1.6 cycles/instruction throughput, delivering 10 MIPS at 16 MHz. It integrates a clock security system (CSS) with dedicated clock monitor and supports multiple low-power modes including Halt, Wait, and Auto-wakeup with user-definable clock gating.

Its analog subsystem includes a 10-bit ADC with 1 LSB linearity and 2 LSB TUE, while its communication suite features high-speed CAN 2.0B (1 Mbit/s), LINUART with automatic resynchronization, USART with synchronous clock output, SPI up to 10 Mbit/s, and I²C up to 400 Kbit/s - all designed for deterministic timing in safety-critical automotive subsystems.

Key Specifications

Pinout & Package

LQFP64 package (10 × 10 mm, 0.5 mm pitch), RoHS-compliant, with 64 pins including 57 user I/Os (11 high-sink capable), VDD/VSS power pairs, dedicated NRST, SWIM debug, CANH/CANL, LIN, and multiple timer/ADC/communication peripheral remappable functions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive microcontroller applications.

Compared with STM8AF52A6TDY, the STM8AF52A8TDY offers double Flash capacity for complex diagnostics and OTA update support; versus STM32F042F6P6, it delivers native CAN, higher temperature rating, and lower interrupt latency - critical for real-time engine control.

Availability

STM8AF52A8TDY 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 automotive production lifecycles.

Supply support for STM8AF52A8TDY 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 devices, sensors, and analog ICs for automotive, industrial, and consumer markets.

The STM8A automotive MCU product line targets cost-sensitive, high-reliability engine and chassis control applications, emphasizing AEC-Q100 compliance, integrated communication interfaces, and extended temperature operation without external support components.

FAQ

What is the maximum operating frequency and corresponding supply voltage range for STM8AF52A8TDY?

The STM8AF52A8TDY achieves a maximum CPU frequency of 24 MHz at VDD = 4.5 V to 5.5 V. At lower supply voltages (3.0 V to 4.5 V), the maximum fCPU is reduced to 16 MHz per the fCPUmax vs. VDD curve in Section 10.3.1 of the datasheet. Operation below 3.0 V is not supported.

Does STM8AF52A8TDY support in-system programming via SWIM, and what voltage levels are required?

Yes, STM8AF52A8TDY supports single-wire in-circuit programming and debugging via the SWIM pin. Programming requires VDD between 2.95 V and 5.5 V, with SWIM pin driven by a 1.65 V to 5.5 V logic-level signal. No external high-voltage programming voltage is needed - all operations occur at core supply voltage.

How many CAN message objects does the on-chip beCAN peripheral support, and are they configurable?

The beCAN peripheral supports 16 message objects (mailboxes), each configurable as transmit or receive with programmable identifier masking and filtering. All 16 objects can be independently assigned to standard (11-bit) or extended (29-bit) CAN identifiers, enabling flexible arbitration and prioritization in multi-node vehicle networks.

Is the 2 Kbyte data EEPROM organized as a separate memory space, and can it be accessed during program execution?

Yes, the 2 Kbyte data EEPROM is physically and logically separate from Flash and RAM, with dedicated read/write/erase instructions. It supports concurrent access: CPU can execute from Flash while EEPROM is being written or erased, enabling background calibration data updates without interrupting real-time control tasks.