X9279 Single Digitally-Controlled Potentiometer

Category: Converters, Electronics, Intersil Corporation

Overview

The datasheet presents the X9279 Single Digitally-Controlled Potentiometer (XDCP), which incorporates a digitally-controlled potentiometer within a CMOS integrated circuit. As noted, Intersil’s X9279 is an obsolete product, with possible substitutes being the ISL95810 and ISL95811. XDCP utilizes a resistor array of 255 elements, where the wiper’s position can be adjusted via a 2-Wire bus interface, influenced by the Wiper Counter Register (WCR). Four non-volatile Data Registers store adjustments that are directly accessible by the user.

Key Features

The X9279 features include:
256 resistor taps allowing fine adjustments,
2-wire serial interface for write, read, and transfer operations of the potentiometer wiper, and
16 non-volatile data registers for storage of wiper positions. It boasts a low standby current of less than 5µA and operates within 2.7V to 5.5V. The device comes in two end-to-end resistance versions, 50kΩ and 100kΩ, ensuring versatility in application.

The endurance of the device supports up to 100,000 data changes per bit per register, with a data retention period of 100 years. The X9279 comes in a 14-lead TSSOP package, is designed for low power consumption, and is specified as Pb-Free and RoHS compliant.

Functional Operations

Upon power-up, the X9279 recalls the saved wiper position via power-on recall functionality, providing ease of use for restoring settings. The device operational integrity is built around the XDCP’s ability to function as a three-terminal potentiometer or a two-terminal variable resistor, fitting an array of applications including control, parameter adjustments, and signal processing.

Precautions

The datasheet cautions users of the X9279’s sensitivity to electrostatic discharge and advises adherence to appropriate integrated circuit handling procedures to maintain the integrity of the device.

Trademark and Copyright Information

The “Intersil (and design)” is a registered trademark, and “XDCP” is a trademark of Intersil Americas Inc. The content is copyrighted by Intersil Americas Inc. spanning from 2005 to 2009. The datasheet also acknowledges that all other mentioned trademarks are owned by their respective proprietors.