AFE Board

• ATM90E26: single-phase energy metering AFE chip
• Voltage sampling: resistor divider network
• Current sampling
  • Shunt resistor or Current Transformer (CT) for L line current
  • Current Transformer (CT) for N line current
• Energy pulses
  • Active energy pulse indicator and isolated output
  • Reactive energy pulse indicator and isolated output
• One communication connector
• Crystal: 8.192MHz
• Power supply for demo board
  • AC 100V-240V line voltage input
  • DC 9V power input
  • External 3.3V input

• SAM4C microcontroller
• Two possible power sources
  • External DC9V
  • External 3.3V from the daughter board
• Digital I/O
  • Five mechanical buttons
    • One reset button
    • Two switch buttons for display (including forward and backward button)
    • Two wake up buttons (one is FWUP, the other is TMP0)
  • One extension header
  • One communication connector
• Segment LCD display
• Five types of communication interfaces
  • One USB
  • One RS485
  • One RS232
  • One Infrared Radiation (IR)
  • One Optical Infrared Radiation (OIR)
• One EEPROM