Renesas X9259UV24-2.7T1

Overview

X9259UV24-2.7T1 from Renesas (formerly Intersil) is a quad digitally controlled potentiometer (XDCP™) IC with 256-tap resolution, 2-wire serial interface, 50kΩ end-to-end resistance, 2.7V–5.5V single-supply operation, and nonvolatile data register storage - used for precision gain, bias, and offset adjustment in analog signal chains.

For engineers reviewing the X9259UV24-2.7T1 datasheet, X9259UV24-2.7T1 pinout, X9259UV24-2.7T1 application, or X9259UV24-2.7T1 equivalent, key selection criteria include wiper position volatility vs. nonvolatile register retention, 24-pin TSSOP package compatibility, 2-wire bus address configuration (A0–A3), hardware write-protect (WP) functionality, and 0.4% resolution across four independent DCPs.

Technical Context

The X9259UV24-2.7T1 integrates four independent CMOS-switched resistor arrays, each with an 8-bit volatile Wiper Counter Register (WCR) and four 8-bit nonvolatile Data Registers (DR0–DR3). Wiper position is set via serial write, transfer from DR, or real-time increment/decrement using SCL/SDA handshaking.

It operates as a 2-wire slave device with fixed Device Type Identifier (0101) and user-configurable 4-bit slave address (A3–A0), supporting up to 16 devices on one bus. Power-up loads DR#0 into each WCR; WP pin disables nonvolatile writes when asserted low.

Key Specifications

Pinout & Package

Package: 24-lead TSSOP (RoHS-compliant, M24.173 drawing), surface-mount, 0.65mm pitch, body size 7.8mm × 4.4mm.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar digitally controlled potentiometer applications.

Compared with AD5242BRUZ10 and MCP42010-I/SL, the X9259UV24-2.7T1 provides higher channel density (4×), guaranteed 50kΩ resistance, hardware write protection, and four nonvolatile registers per channel - making it uniquely suited for multi-parameter analog calibration in compact, field-serviceable designs.

Availability

X9259UV24-2.7T1 is available at Aetrix Electronics and suitable for audio volume control, RF amplifier biasing, sensor signal conditioning, and voltage regulator trimming requiring stable component supply across commercial temperature range (0°C to +70°C).

Supply support for X9259UV24-2.7T1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics acquired Intersil in 2017 and maintains its precision analog portfolio, including digitally controlled potentiometers optimized for industrial and communications infrastructure.

The X9259 series was designed for high-reliability analog trimming in systems requiring long-term calibration stability, nonvolatile parameter storage, and minimal PCB footprint - targeting test equipment, medical devices, and programmable power supplies.

FAQ

What is the operating voltage range for the X9259UV24-2.7T1?

The X9259UV24-2.7T1 operates from 2.7V to 5.5V, as confirmed by the "X9259-2.7" designation in the ordering table and Absolute Maximum Ratings section. This extended low-voltage capability enables direct use with 3.3V microcontrollers and battery-powered systems without level-shifting circuitry. The X9259UV24-2.7T1 maintains full 256-tap resolution and nonvolatile register functionality across this entire range.

Does the X9259UV24-2.7T1 support true I²C communication?

Yes, the X9259UV24-2.7T1 implements a standard 2-wire interface compatible with I²C protocol conventions, including START/STOP conditions, ACK/NACK signaling, and 7-bit addressing (with fixed 0101 prefix). It functions strictly as a slave device and supports clock frequencies up to 400kHz. The X9259UV24-2.7T1 does not require special master firmware - standard I²C drivers can configure wiper positions and transfer data to/from its nonvolatile registers.

How many independent potentiometers does the X9259UV24-2.7T1 contain?

The X9259UV24-2.7T1 integrates four completely independent digitally controlled potentiometers (DCPs), labeled DCP0 through DCP3. Each has dedicated RH, RL, and RW pins, its own 8-bit volatile Wiper Counter Register (WCR), and four 8-bit nonvolatile Data Registers (DR00–DR03, DR10–DR13, etc.). All four channels operate simultaneously and can be controlled individually via the 2-wire bus using channel-select bits in the instruction byte.

What is the purpose of the WP pin on the X9259UV24-2.7T1?

The WP (Write Protect) pin on the X9259UV24-2.7T1 is an active-low hardware control that disables all nonvolatile writes to the Data Registers when asserted. When WP is pulled low, instructions like Write Data Register or XFR Wiper to Data Register are blocked - preventing accidental overwrites of calibrated values. Volatile WCR updates remain functional, allowing runtime adjustment without compromising stored settings. This feature is unique to the X9259UV24-2.7T1 among comparable quad DCPs.

Can the X9259UV24-2.7T1 be used as a two-terminal variable resistor?

Yes, the X9259UV24-2.7T1 supports both three-terminal potentiometer and two-terminal variable resistor configurations. In two-terminal mode, one end terminal (RH or RL) is connected to the wiper (RW), effectively creating a digitally adjustable resistor between the remaining terminal and RW. This is explicitly stated in the datasheet's first paragraph and validated by the functional diagram and pin descriptions. The X9259UV24-2.7T1 maintains 50kΩ total resistance and 0.4% resolution in this configuration.