The T5552 is a two terminal, contactless R/W-IDentification IC (IDIC) for tag applications in the 125 kHz (25 kHz) range. The IC uses the external RF signal to generate its own power supply and internal clock reference. It is built into a standard micromodule which is suitable for contactless R/W identification applications. It is a plastic encapsulated package on a copper lead frame. The micromodule contains the IDIC with an EEPROM memory grouped into 32 individually addressable data blocks, and a 435-pF capacitor. Each block of the IDIC is made up of 32 bits of data plus an associated lock bit for block write protection. Blocks 1 to 31 are provided for user-related data, block 0 is reserved for system configuration.