STMicroelectronics STM8AF52AATAY

Overview

STM8AF52AATAY from STMicroelectronics is an AEC-Q100 Grade 0 qualified automotive 8-bit MCU 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 master/slave operation via LINUART, includes a 10-bit ADC with 2 LSB total unadjusted error, and operates across –40 °C to +150 °C for engine control unit applications.

For engineers reviewing the STM8AF52AATAY datasheet, STM8AF52AATAY pinout, STM8AF52AATAY application, or STM8AF52AATAY equivalent, key selection criteria include automotive-grade CAN/LIN timing compliance, high-temperature Flash/EEPROM reliability, nested interrupt controller with 32 vectors, and dual RC oscillators (16 MHz HSI + 128 kHz LSI) with clock security system.

Technical Context

The STM8AF52AATAY implements a Harvard-architecture STM8A CPU with 3-stage pipeline and average 1.6 cycles/instruction throughput, delivering 10 MIPS at 16 MHz. Its clock management integrates trimmable 16 MHz internal RC, low-power 128 kHz RC, and external crystal oscillator support with clock monitor for fail-safe operation.

Interrupt handling uses a nested controller supporting up to 37 external interrupts across 5 vectors, while timer subsystem includes two 16-bit general-purpose timers (3 CAPCOM channels each), one advanced control timer (4 CAPCOM, 3 complementary outputs, dead-time insertion), and auto-wakeup capability - all synchronized under programmable clock gating.

Key Specifications

Pinout & Package

LQFP64 package (7 mm × 7 mm, 0.5 mm pitch) with 64-pin layout optimized for automotive PCB routing and thermal dissipation in compact ECUs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8AF62A9TAY, the STM8AF52AATAY trades one USART/SPI for mandatory CAN 2.0B support - critical for powertrain networking. Versus SPC560B50L5, it offers lower BOM cost and simpler LIN implementation but less processing bandwidth for model-based control.

Availability

STM8AF52AATAY is available at Aetrix Electronics and suitable for engine control units, transmission control units, body control modules, and electric power steering systems requiring stable component supply across extended automotive lifecycles.

Supply support for STM8AF52AATAY 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, analog ICs, power devices, and MEMS sensors for automotive, industrial, and consumer markets.

The STM8A automotive MCU product line targets cost-sensitive, high-reliability embedded control applications in powertrain, chassis, and body electronics - emphasizing AEC-Q100 qualification, extended temperature operation, and integrated communication peripherals.

FAQ

What is the maximum operating frequency of the STM8AF52AATAY under automotive conditions?

The STM8AF52AATAY achieves a maximum CPU frequency of 24 MHz across its full specified temperature range (–40 °C to +150 °C) and supply voltage (3.0–5.5 V), as confirmed by electrical characteristics Table 24 and Figure 11 in the production datasheet DocID14395 Rev 15.

Does the STM8AF52AATAY include hardware support for LIN communication?

Yes - it integrates a LINUART peripheral compliant with LIN 2.2 specification, supporting both master and slave modes with automatic resynchronization. This eliminates the need for external LIN transceivers in basic node implementations, as detailed in Section 5.9.2 of the datasheet.

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

The beCAN controller supports 16 message objects (mailboxes) with programmable acceptance filtering, enabling concurrent handling of standard and extended CAN identifiers. This configuration is fixed in hardware and documented in Section 5.9.5 and Register Map Table 14.

What packaging options are available for the STM8AF52AATAY?

The STM8AF52AATAY is offered exclusively in LQFP64 (7 mm × 7 mm, 0.5 mm pitch) package, as indicated by the 'TAY' suffix in the order code and verified in Table 1 and Section 11.2 of the datasheet. No VFQFPN32 or LQFP48 variants exist for this specific part number.