This part is a kind of semiconductor called DS2431.

Function of this product has 1-Wire EEPROM.

Manufacturers : Maxim Integrated

Image and pinout :

Some of the text within the PDF file :

DS2431 1024-Bit, 1-Wire EEPROM General Description The DS2431 is a 1024-bit, 1-Wire® EEPROM chip organized as four memory pages of 256 bits each. Data is written to an 8-byte scratchpad, verified, and then copied to the EEPROM memory. As a special feature, the four memory pages can individually be write protected or put in EPROM-emulation mode, where bits can only be changed from a 1 to a 0 state. The DS2431 communicates over the single-conductor 1-Wire bus. The communication follows the standard 1-Wire protocol. Each device has its own unalterable and unique 64-bit ROM registration number that is factory lasered into the chip. The registration number is used to address the device in a multidrop, 1-Wire net environment. Applications ●● Accessory/PCB Identification ●● Medical Sen [ ... ]

DS2431 PDF Datasheet Download