This part is a kind of semiconductor called LTC2991.

Function of this product has Temperature Sensor and Dual Voltage Monitor.

Manufacturers : Linear

Image and pinout :

Some of the text within the PDF file :

LTC2991 Octal I2C Voltage, Current, and Temperature Monitor FEATURES n n n n n n n n n n n n DESCRIPTION The LTC®2991 is used to monitor system temperatures, voltages and currents. Through the I2C serial interface, the eight monitors can individually measure supply voltages and can be paired for differential measurements of current sense resistors or temperature sensing transistors. Additional measurements include internal temperature and internal VCC. The internal 10ppm reference minimizes the number of supporting components and area required. Selectable address and configurable functionality give the LTC2991 flexibility to be incorporated in various systems needing temperature, voltage or current data. The LTC2991 fits well in systems needing submillivolt voltage resolution, 1% current [ ... ]

LTC2991 PDF Datasheet Download