| Applications Core Processor Program Memory Type Controller Series RAM Size Interface Number of I/O Voltage - Supply Operating Temperature Mounting Type Package / Case Supplier Device Package | Secure Communications AVR EEPROM - - I²C, 2-Wire Serial - 3 V ~ 3.6 V 0°C ~ 70°C Surface Mount 28-TSSOP (0.173, 4.40mm Width) 28-TSSOP |