Technical Specifications:

• Processor: 32-bit RISC microcontroller, 80 MHz clock
• Memory: 256KB Flash / 64KB SRAM
• Input Interfaces:
  • 8× NTC temperature sensors (±0.5°C accuracy)
  • 4× pressure switches (water level detection)
  • 2× door lock switches (safety interlock)
  • 1× water flow meter (pulse input)
  • 1× vibration sensor (unbalance detection)
  • User interface: 6-button membrane keypad + LCD display driver
• Output Interfaces:
  • 6× TRIAC outputs (heater, water valve, detergent dispenser)
  • 4× relay outputs (drain pump, door lock, circulation pump)
  • 1× PWM output (motor speed control, 1kHz–16kHz)
  • 1× buzzer driver (audible feedback)
• Communication: I²C bus (display module), UART (diagnostic port)
• Operating Voltage: 5V DC (regulated on-board from 230V AC input via SMPS)
• Operating Temperature: -10°C to +70°C
• Dimensions: 240mm × 160mm × 30mm
• Weight: 0.45 kg

Material Composition:

• PCB: FR4, TG150, 1.6mm thickness, HASL finish
• Conformal Coating: Acrylic, full coverage
• Connectors: 5× Molex KK series, 2× JST XH series
• Relays: Finder 40.52 series, 16A / 250V AC
• TRIACs: BTA16-600B, snubber-protected
• Display: 128×64 dot-matrix LCD with LED backlight

Structural Features:

• Multi-layer PCB with dedicated ground plane for EMI suppression
• Isolation barrier between mains-voltage section and low-voltage logic (8mm creepage)
• Diagnostic test points labeled on silk-screen for service technicians
• EEPROM (24C256) for cycle data storage and error logging
• Watchdog timer with automatic reset on software hang

Working Principle: The microcontroller executes the programmed wash/dry cycle algorithm stored in Flash memory. It continuously monitors all sensor inputs, controls outputs to actuators (valves, heaters, motor, pump) in precise sequence and timing, and manages user interface feedback via LCD and buzzer. The I²C bus communicates with the display module for real-time cycle status presentation.

Advantages:

• Comprehensive diagnostics — stores last 10 error codes in EEPROM for service readout
• Watchdog protection ensures system recovers from software faults automatically
• Modular design — display and keypad are separate sub-modules connected via bus
• RoHS compliant — lead-free solder, halogen-free materials

Applicable Industries: AEG front-loading washing machines, AEG tumble dryers, AEG washer-dryer combinations

Installation Requirements:

• Install in dry zone of appliance chassis, away from water splash
• All connectors must be fully mated — partial connection causes intermittent faults
• Display module connects via 6-pin I²C ribbon cable — do not reverse polarity
• Firmware version must match appliance model (verified via label on board)

Usage Precautions:

• ESD-sensitive — handle with grounded wrist strap
• Do not disconnect connectors under power — risks back-EMF damage to MCU
• If error code appears, consult AEG service manual for code interpretation — do not replace board without diagnosis