Renesas X9259UV24IT1

Overview

X9259UV24IT1 from Intersil (now Renesas) is a quad digitally controlled potentiometer (XDCP™) IC implementing four independent 256-tap, 50kΩ end-to-end resistance potentiometers with volatile wiper counter registers and nonvolatile data registers. It operates from 2.7V to 5.5V, features 2-wire serial interface, <5µA standby current, and 0.4% resolution. It is used for precision gain control in audio amplifiers, DC bias trimming in RF power amplifiers, and programmable reference voltage generation in sensor signal conditioning circuits.

For engineers reviewing the X9259UV24IT1 datasheet, X9259UV24IT1 pinout, X9259UV24IT1 application, or X9259UV24IT1 equivalent, this page delivers verified technical context, validated pin functions, confirmed operating parameters, and real-world circuit-level use cases - all specific to the TSSOP-24 package, industrial temperature range (-40°C to +85°C), and RoHS-compliant construction of X9259UV24IT1.

Technical Context

The X9259UV24IT1 integrates four monolithic CMOS DCPs, each with resistor ladder and CMOS switch array, enabling precise digital wiper positioning via 8-bit WCR. Each potentiometer supports both three-terminal potentiometer and two-terminal variable resistor configurations.

Its 2-wire interface uses open-drain SDA with pull-up requirement and active-low WP for hardware write protection. Device addressing is set by A3–A0 pins, allowing up to 16 devices on one bus. Nonvolatile writes require high-voltage cycle timing (5–10ms) and are inhibited when WP is low.

Key Specifications

Pinout & Package

Package: 24-pin TSSOP (RoHS-compliant, M24.173 drawing), surface-mount, 0.65mm pitch, suitable for automated assembly and space-constrained PCB layouts.

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/ST, X9259UV24IT1 uniquely delivers four independent, nonvolatile, globally controllable DCPs in one TSSOP-24 package with hardware write protection-making it optimal for compact, high-channel-count, field-calibratable analog systems.

Availability

X9259UV24IT1 is available at Aetrix Electronics and suitable for audio gain control, RF power amplifier biasing, sensor signal conditioning, and programmable voltage reference applications requiring stable component supply, long-term calibration retention, and industrial temperature operation.

Supply support for X9259UV24IT1 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

Intersil (acquired by Renesas Electronics in 2017) is a semiconductor company specializing in high-performance analog and power management ICs for industrial, communications, and computing markets.

The X9259 product line was designed for precision analog trimming and programmable resistance in embedded systems requiring nonvolatile calibration, multi-channel coordination, and robust 2-wire interface compatibility.

FAQ

What is the operating temperature range for X9259UV24IT1?

X9259UV24IT1 is rated for industrial temperature operation from -40°C to +85°C. This range is confirmed in the Ordering Information table (page 2) and Recommended Operating Conditions (page 12) of the FN8169 datasheet. The "UV" suffix explicitly denotes the industrial-grade version, distinguishing it from the commercial-grade "US" variant (0°C to +70°C). This makes X9259UV24IT1 suitable for deployment in harsh environments such as factory automation, outdoor telecom equipment, and automotive under-hood modules where thermal stability is critical.

Does X9259UV24IT1 support true I²C communication?

Yes, X9259UV24IT1 implements a standard 2-wire interface compatible with I²C protocol specifications, including START/STOP conditions, ACK/NACK handshaking, and 7-bit addressing (with 4-bit device address set by A3–A0). It supports 400kHz clock frequency (fast-mode), open-drain SDA with external pull-up, and proper timing margins per I²C spec. However, it does not implement full I²C slave arbitration or clock stretching - it operates strictly as a simple slave device. All documented instructions (Read WCR, Write DR, etc.) function reliably with standard I²C masters like STM32, PIC, or Arduino Wire libraries.

How many nonvolatile registers does X9259UV24IT1 have per potentiometer?

X9259UV24IT1 has four 8-bit nonvolatile Data Registers (DR#0 through DR#3) for each of its four potentiometers, totaling 16 nonvolatile registers. As stated on page 5, "Each of the four DCPs has four 8-bit nonvolatile Data Registers." These registers store wiper positions or system parameters and retain data for 100 years. DR#0 is loaded into the corresponding Wiper Counter Register (WCR) at power-up, enabling repeatable startup behavior. Writes to these registers require a 5–10ms high-voltage write cycle and are blocked when the WP pin is low.

What is the wiper resistance specification for X9259UV24IT1 at 3.3V supply?

At VCC = 3.3V, the wiper resistance (RW) of X9259UV24IT1 is 300Ω typical, as specified in the Analog Specifications table (page 12, "RW Wiper Resistance" row, "at VCC = 3V" condition). While the datasheet lists values at 3V and 5V, interpolation confirms 300Ω is the applicable typical value for 3.3V operation. This parameter directly affects loading error in voltage divider configurations - for example, when driving a 10kΩ load, the resulting error is ~3% - and must be accounted for in precision gain-setting networks.

Can X9259UV24IT1 be used as a two-terminal variable resistor?

Yes, X9259UV24IT1 can be configured as a two-terminal variable resistor by connecting either RH or RL to the wiper (RW) pin, effectively shorting one end of the potentiometer. The datasheet explicitly states on page 1: "The XDCP can be used as a three-terminal potentiometer or as a two-terminal variable resistor…" This configuration is commonly used in current-source programming, LED brightness control, and programmable current-limit circuits. When used this way, the effective resistance ranges from near 0Ω (wiper at shorted terminal) to the full 50kΩ (wiper at opposite terminal), with 256 discrete steps.