2-Wire Bus Quad Digitally-Controlled (XDCP™) Potentiometers X9259

Category: Converters, Electronics, Intersil Corporation

The Intersil X9259 datasheet provides information on a monolithic CMOS integrated circuit that includes four digitally controlled potentiometers within one package. These potentiometers are referred to as XDCP™ or Quad Digitally-Controlled Potentiometers. Each of the four potentiometers is built from 256 resistor taps, offering a fine resolution of 0.4%, and has a low typical wiper resistance of 100Ω at Vcc = 5V.

The operation of these potentiometers is governed via a two-wire serial interface, which is used for writing to or reading from the device. Users can control the wiper position through a volatile Wiper Counter Register (WCR) associated with each potentiometer. Additionally, there are four nonvolatile Data Registers per potentiometer that can be written to and read by the user, ensuring that multiple wiper positions can be stored persistently without power.

Upon powering up, the device automatically recalls the contents of the default Data Registers for each potentiometer (DR00, DR10, DR20, DR30) and applies them to the corresponding Wiper Counter Registers, therefore setting the initial positions of the potentiometer wipers. The device is noted for its low standby current of less than 5µA max, with an operating voltage range of 2.7V to 5.5V. Built for longevity, each potentiometer element is rated for 100,000 data changes per bit, per register, and offers a data retention period of 100 years.

This integrated circuit can be used as a three-terminal potentiometer or as a two-terminal variable resistor, which makes it suitable for various applications, including but not limited to, control mechanisms, parameter adjustments, and signal processing tasks. The X9259 is identified as a single supply version of the X9258, claiming a total resistance option of 50kΩ.

Available in 24 Ld SOIC and 24 Ld TSSOP packaging, the device is designed using low power CMOS technology and is compliant with RoHS, making it a lead-free choice suitable for environmentally conscious applications. The document also includes a functional diagram showcasing the electrical connections and configuration of the four potentiometers (DCP0 to DCP3) along with various Register and Interface Control components.

Finally, the datasheet mentions that the Intersil X9259 devices are sensitive to electrostatic discharge and thus require proper Integrated Circuit Handling Procedures. The datasheet was last updated on December 12, 2014, under the filename FN8169.6. It provides a cautionary note for users in handling the product to prevent damage due to electrostatic discharge, with the contact information for Intersil provided for further assistance.