The AD5258 provides a compact， nonvolatile 3 mm × 4.9 mm packaged solution for 64-position adjustment applications. These devices perform the same electronic adjustment function as mechanical potentiometers1 or variable resistors， but with enhanced resolution and solid-state reliability. The wiper settings are controllable through an I2 C-compatible digital interface that is also used to read back the wiper register and EEPROM content in addition， resistor tolerance is stored within EEPROM， providing an end-to-end tolerance accuracy of 0.1%. There is also a software write protection function that ensures data cannot be written to the EEPROM register. A separate VLOGIC pin delivers increased interface flexibility. For users who need multiple parts on one bus， Address Bit AD0 and Address Bit AD1 allow up to four devices on the same bus. 1 The terms digital potentiometer， VR （variable resistor）， and RDAC are used interchangeably.