STMicroelectronics STM8AF6223PAAU

Overview

STM8AF6223PAAU from STMicroelectronics is an AEC-Q100 qualified automotive 8-bit microcontroller featuring a 16 MHz STM8A core, 8 Kbyte Flash memory with 20-year data retention at 55 °C, 640 byte true data EEPROM (300 kcycle endurance), and integrated 10-bit ADC with 7 muxed channels. It supports LIN 2.2 communication, SPI up to 8 Mbit/s, I²C up to 400 Kbit/s, and operates across –40 to 150 °C for engine control unit (ECU) sensor interface applications.

For engineers reviewing the STM8AF6223PAAU datasheet, STM8AF6223PAAU pinout, STM8AF6223PAAU application, or STM8AF6223PAAU equivalent, key selection criteria include automotive temperature grade (–40 to 150 °C), LIN 2.2 compliance with automatic resynchronization, high-sink I/O capability (21 pins), and embedded clock security system with monitor.

Technical Context

The STM8AF6223PAAU implements a Harvard-architecture STM8A core with 3-stage pipeline and extended instruction set, enabling deterministic real-time execution in safety-critical automotive subsystems. Its clock management includes trimmable 16 MHz RC and low-power 128 kHz RC oscillators, plus external crystal support with clock security monitoring.

Interrupt handling uses a nested controller supporting 32 interrupts and up to 28 external inputs on 7 vectors, while timer resources include a 16-bit advanced control timer (TIM1) with dead-time insertion and complementary outputs, two additional 16-bit general-purpose timers (TIM5), and an 8-bit basic timer (TIM6) for flexible timing and PWM generation.

Key Specifications

Pinout & Package

LQFP32 package (7 × 7 mm, 0.8 mm pitch), RoHS-compliant, with exposed thermal pad for enhanced heat dissipation in high-temperature automotive environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STM8AF6226PAAU, the STM8AF6223PAAU offers identical peripheral functionality in TSSOP20/LQFP32 form factors but omits TIM2 and two ADC inputs-making it optimal for space-constrained LIN node designs. Versus RL78/F13-BS, it delivers lower system cost and smaller footprint for LIN-dominant applications, though with less processing headroom and no CAN support.

Availability

STM8AF6223PAAU is available at Aetrix Electronics and suitable for engine control units, body control modules, and transmission control systems requiring stable component supply across extended automotive lifecycles.

Supply support for STM8AF6223PAAU 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 STM8AF series targets automotive body and powertrain applications with AEC-Q100 qualification, extended temperature range, and integrated LIN/ADC/timers to reduce system complexity in cost-sensitive electronic control units.

FAQ

What is the maximum operating junction temperature for STM8AF6223PAAU?

The device is rated for ambient temperatures from –40 to +150 °C and has a maximum junction temperature of +175 °C under continuous operation. Thermal resistance θ_JA is 45 °C/W for LQFP32 package with standard 2-layer PCB layout and 1 cm² copper pour under the thermal pad, enabling reliable operation in under-hood environments without active cooling.

Does STM8AF6223PAAU support in-system programming via SWIM?

Yes, the device supports single-wire in-circuit programming and debugging through dedicated PC6 (SWIM) and PC7 (NRST) pins. No external voltage translator is required-SWIM operates at VDD level (3.3–5.5 V) and is compatible with ST-LINK/V2 and ST-LINK/V2-ISOL programmers for field firmware updates.

How is LIN 2.2 compliance implemented without an external transceiver?

The integrated LINUART peripheral handles protocol framing, checksum calculation, and automatic resynchronization in hardware. When paired with a standard LIN bus physical layer (e.g., TLE7259-2GE), the MCU drives the bus directly via PD2 (TX) and PD3 (RX) pins, meeting LIN 2.2 electrical and timing requirements including ±15% baud tolerance and wake-up pulse detection.

Can the 640-byte data EEPROM be used for storing cryptographic keys?

No-the data EEPROM is not secured against read-out; it lacks hardware encryption or write-protection granularity below sector level. While suitable for calibration data and configuration parameters, cryptographic keys must be stored in protected Flash sectors using option byte ROP (Read-Out Protection) Level 1 or 2, which disables SWIM access and prevents unauthorized extraction.