STMicroelectronics STM8AF528ATAY

Overview

STM8AF528ATAY 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 STM8AF528ATAY datasheet, STM8AF528ATAY pinout, STM8AF528ATAY application, or STM8AF528ATAY equivalent, key selection criteria include automotive-grade temperature range (–40 °C to 150 °C), LIN 2.2-compliant UART with automatic resynchronization, 10-bit ADC with 2 LSB total unadjusted error, and dual 16-bit general-purpose timers with CAPCOM channels for PWM generation in motor control loops.

Technical Context

The STM8AF528ATAY implements a Harvard-architecture STM8A CPU with 3-stage pipeline and average 1.6 cycles/instruction throughput, enabling 10 MIPS at 16 MHz. Its clock system integrates trimmable 16 MHz HSI and 128 kHz LSI oscillators plus external crystal support up to 24 MHz, all monitored by a dedicated clock security system (CSS).

Peripheral integration includes a high-speed CAN 2.0B controller with message filtering and FIFO buffering, LINUART supporting master/slave modes with hardware resync, and a 10-bit ADC with up to 16 multiplexed inputs, 1 LSB linearity, and programmable sampling time - all operating under full AEC-Q100 qualification across –40 °C to 150 °C.

Key Specifications

Pinout & Package

LQFP64 package: 64-pin, 10 × 10 mm low-profile quad flat package with exposed thermal pad; RoHS-compliant, moisture sensitivity level 3 (MSL3).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar automotive 8-bit microcontroller applications.

Compared with STM8AF6286TAY, the STM8AF528ATAY adds essential CAN 2.0B for powertrain networking; versus MC9S08DZ60CLCR, it delivers integrated LIN 2.2 with automatic resync and higher Flash endurance - making it optimal for new ASIL-B automotive control designs requiring mixed-protocol connectivity.

Availability

STM8AF528ATAY is available at Aetrix Electronics and suitable for engine control units, transmission control modules, electric power steering systems, and brake control modules requiring stable component supply across extended automotive lifecycles.

Supply support for STM8AF528ATAY 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 ICs, sensors, and automotive-grade silicon for industrial and transportation markets.

The STM8A automotive microcontroller product line targets cost-sensitive, high-reliability powertrain and chassis applications, emphasizing AEC-Q100 qualification, extended temperature operation, and integrated communication peripherals to reduce system-level component count.

FAQ

What is the maximum operating frequency and corresponding supply voltage range for the STM8AF528ATAY?

The STM8AF528ATAY achieves a maximum CPU frequency of 24 MHz at VDD = 4.5–5.5 V. At lower voltages, fCPU is derated linearly: 16 MHz is guaranteed at VDD ≥ 3.0 V, and operation down to 2.95 V is supported with reduced timing margins per datasheet Figure 11. This voltage/frequency scaling enables flexible power management in 12 V automotive systems with wide battery swing.

Does the STM8AF528ATAY support hardware-based LIN 2.2 compliance without an external transceiver?

Yes - the integrated LINUART peripheral supports full LIN 2.2 compliance in both master and slave modes, including automatic baud rate detection, checksum calculation, and hardware resynchronization. Only a single external LIN transceiver (e.g., TLE7259-3GE) is required for physical layer signaling; no software bit-banging or external timing components are needed.

How is flash memory protected against unauthorized read-out or modification in the STM8AF528ATAY?

Flash protection is implemented via three configurable mechanisms: Read-out Protection (ROP) blocks SWIM access to Flash and EEPROM; Write Protection (WP) locks specific Flash sectors against accidental overwrite; and User Boot Code (UBC) prevents execution from unprotected memory regions. All are controlled through dedicated option bytes programmed during production or field update.

What thermal management provisions exist for the LQFP64 package in high-temperature under-hood environments?

For the LQFP64 package (10 × 10 mm), ST specifies θ_JA = 42 °C/W and θ_JC = 6.5 °C/W with a 200 mm² copper pour and 2 oz. copper thickness. The exposed thermal pad must be soldered to a solid ground plane; thermal vias (≥6×0.3 mm) are recommended beneath the pad. Junction temperature must remain ≤150 °C - achievable with ≤350 mW total dissipation at 125 °C ambient using standard PCB cooling.