Renesas X9271UV14I-2.7T1

Overview

X9271UV14I-2.7T1 from Intersil (now Renesas) is a single-channel, 256-tap, SPI-controlled digital potentiometer with 50kΩ end-to-end resistance, 2.7V–5.5V supply operation, and industrial temperature range (−40°C to +85°C). It functions as a programmable three-terminal potentiometer or two-terminal variable resistor in precision analog signal conditioning, DC bias trimming, and gain control circuits.

For engineers reviewing the X9271UV14I-2.7T1 datasheet, X9271UV14I-2.7T1 pinout, X9271UV14I-2.7T1 application, or X9271UV14I-2.7T1 equivalent, key selection considerations include its nonvolatile data register storage (16 registers), power-on recall from DR0, <3µA standby current, 100-year data retention, and 14-lead TSSOP package with hardware write protection (WP) and HOLD functionality.

Technical Context

The X9271UV14I-2.7T1 implements a monolithic CMOS resistor ladder of 255 segments with digitally controlled CMOS switches selecting one of 256 tap points via an 8-bit volatile Wiper Counter Register (WCR). Its SPI interface supports full-duplex read/write/transfer operations using SI, SO, SCK, and CS, with device addressing via A0/A1 pins and hardware-level protection via WP and HOLD pins.

Operation relies on dual-domain memory: volatile WCR controls real-time wiper position, while four nonvolatile data registers (DR0–DR3) in Bank 0 store persistent settings; power-up automatically loads DR0 into WCR. The device supports increment/decrement commands for fine-grained adjustment and includes a 1-bit status register (WIP) to monitor nonvolatile write progress.

Key Specifications

Pinout & Package

Package: 14-lead TSSOP (4.4mm body width, M14.173 drawing), RoHS-compliant Pb-free plus anneal finish.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5241BRMZ50 and MCP41050-I/P, the X9271UV14I-2.7T1 uniquely combines SPI interface, hardware write protection, HOLD functionality, and 16 nonvolatile registers-making it optimal for field-calibratable industrial systems requiring robust, multi-parameter analog tuning.

Availability

X9271UV14I-2.7T1 is available at Aetrix Electronics and suitable for industrial sensor calibration, programmable power supplies, and audio equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for X9271UV14I-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 (formerly Intersil) is a global semiconductor leader specializing in microcontrollers, analog, power management, and timing solutions for industrial, automotive, and communications markets.

The X9271UV14I-2.7T1 belongs to Renesas' XDCP™ (eXternally Digitally Controlled Potentiometer) family, designed specifically for replacing mechanical potentiometers in high-reliability analog tuning applications demanding nonvolatile storage, low power, and SPI configurability.

FAQ

What is the operating voltage range for the X9271UV14I-2.7T1?

The X9271UV14I-2.7T1 operates from 2.7V to 5.5V, supporting both 3.3V and 5V system rails without external level shifters. This range is explicitly defined in the ordering information and confirmed in the Absolute Maximum Ratings table of the FN8174 datasheet. Operation below 2.7V may result in unreliable SPI communication or incomplete nonvolatile writes.

Does the X9271UV14I-2.7T1 retain its wiper position after power cycling?

Yes-the X9271UV14I-2.7T1 automatically loads the contents of Data Register 0 (DR0) into the volatile Wiper Counter Register (WCR) on power-up. This power-on recall behavior ensures the device resumes operation at a known, user-stored setting without host intervention, provided DR0 was previously programmed with the desired wiper value.

How many nonvolatile registers does the X9271UV14I-2.7T1 have, and what are they used for?

The X9271UV14I-2.7T1 contains 16 nonvolatile data registers organized as four banks of four 8-bit registers. These store wiper positions or general-purpose system parameters. Only Bank 0 (DR0–DR3) supports direct transfer to the WCR; Banks 1–3 provide additional SPI-accessible memory for calibration data, user preferences, or firmware variables.

Can the X9271UV14I-2.7T1 be used in a two-terminal variable resistor configuration?

Yes-the X9271UV14I-2.7T1 supports both three-terminal potentiometer (RH–RW–RL) and two-terminal variable resistor (e.g., RH–RW or RW–RL) configurations. In two-terminal mode, it replaces trimmer potentiometers in gain-setting networks or bias current paths, with wiper resistance (150Ω typ. at 5V) contributing directly to total resistance.

What is the purpose of the HOLD pin on the X9271UV14I-2.7T1?

The HOLD pin on the X9271UV14I-2.7T1 pauses ongoing SPI transactions without resetting internal state-allowing the host controller to temporarily suspend communication (e.g., during interrupt handling) and resume seamlessly. It requires SCK to be LOW before assertion and is not required if unused (must be held HIGH).