A surgical system includes a surgical instrument having a body, an ultrasonic transducer, a shaft extending distally from the body, and an end effector at a distal end of the shaft and being operable to treat tissue with ultrasonic energy. An accessory device is configured to operatively couple the surgical instrument with a generator operable to power the surgical instrument to provide ultrasonic energy. A primary EEPROM is provided within the instrument body and is operable to track usage of the surgical instrument. The system further includes at least one of: an accessory EEPROM integrated into the accessory device and being operable to track usage of the accessory device； a transducer EEPROM integrated into the ultrasonic transducer and being operable to track usage of the ultrasonic transducer； or an ASIC integrated into the accessory device and being operable to communicate with the generator regarding a state of the surgical instrument.
