Renesas X9271UV14I

Overview

X9271UV14I from Intersil is a single-supply, low-power, 256-tap digitally controlled potentiometer (XDCP™) with SPI interface, 50kΩ end-to-end resistance, ±20% tolerance, and 14-lead TSSOP package. It functions as a programmable three-terminal potentiometer or two-terminal variable resistor in precision analog control circuits requiring nonvolatile wiper position storage and power-up recall.

For engineers reviewing the X9271UV14I datasheet, X9271UV14I pinout, X9271UV14I application, or X9271UV14I equivalent, this device supports SPI-based wiper positioning, volatile WCR + four nonvolatile data registers, 2.7V–5.5V operation, <3µA standby current, and industrial temperature range (–40°C to +85°C) - critical for embedded sensor conditioning, voltage reference trimming, and gain control in space-constrained designs.

Technical Context

The X9271UV14I implements a monolithic CMOS resistor ladder of 255 segments with CMOS-switched wiper taps controlled by an 8-bit volatile Wiper Counter Register (WCR). Its SPI interface complies with standard hardware conventions: SI latches on rising SCK edge, SO outputs on falling SCK edge, and CS enables active mode while HOLD allows serial bus pause without reset.

Power-up behavior is deterministic: DR0 contents load into WCR at VCC stabilization, enabling repeatable startup wiper position. Nonvolatile writes to data registers require high-voltage internal cycles (5–10 ms), monitored via the WIP status bit, and are protected by hardware WP pin logic.

Key Specifications

Pinout & Package

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

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD5241BRMZ10 and MCP41010-I/P, the X9271UV14I uniquely combines SPI interface, 256-tap resolution, four nonvolatile registers with DR0 power-up recall, and industrial temperature rating - making it optimal for autonomous, maintenance-free analog calibration in harsh environments.

Availability

X9271UV14I is available at Aetrix Electronics and suitable for industrial sensor conditioning, precision voltage reference trimming, and embedded audio control applications requiring stable component supply, long-term calibration integrity, and RoHS-compliant packaging.

Supply support for X9271UV14I 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 (now part of Renesas Electronics) is a semiconductor company specializing in high-performance analog and mixed-signal ICs for power management, precision analog, and interface applications.

The X9271UV14I belongs to Intersil's XDCP™ (Digitally Controlled Potentiometer) product line, designed specifically for replacing mechanical potentiometers in automated calibration, closed-loop control, and programmable analog signal conditioning systems.

FAQ

What is the operating voltage range for the X9271UV14I?

The X9271UV14I operates from 2.7V to 5.5V, supporting both 3.3V and 5V logic systems without level translation. This range is explicitly specified in the Ordering Information table and Absolute Maximum Ratings section of the FN8174 datasheet, and applies directly to the X9271UV14I variant with "-2.7" suffix. Operation outside this window risks undefined behavior or damage.

Does the X9271UV14I retain its wiper position after power cycling?

Yes, the X9271UV14I loads the contents of Data Register 0 (DR0) into the volatile Wiper Counter Register (WCR) on every power-up, ensuring repeatable startup position. This power-on recall function is guaranteed by design and documented in the Principles of Operation and Device Description sections of the FN8174 datasheet for the X9271UV14I.

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

The X9271UV14I has four 8-bit nonvolatile data registers (DR0–DR3) in Bank 0. These store wiper positions or user-defined system parameters and retain data for 100 years. DR0 serves as the default power-up source for the WCR, while DR1–DR3 support multi-point calibration or configuration storage - all accessible via SPI read/write/transfer instructions.

Can multiple X9271UV14I devices share the same SPI bus?

Yes, up to four X9271UV14I devices can operate on one SPI bus using the A0 and A1 address pins to configure unique 2-bit slave addresses. The Identification Byte format (ID[3:0] = 0101, A1/A0 set by pins) ensures only the addressed device responds to commands - confirmed in the Instruction Format and Pin Descriptions sections of the FN8174 datasheet.

What is the maximum SPI clock frequency supported by the X9271UV14I?

The X9271UV14I supports SPI clock frequencies up to 2.5MHz, as specified in the AC Timing table (fSCK parameter) of the FN8174 datasheet. At this rate, wiper position updates complete within 10µs (tWRL), enabling responsive real-time adjustments. Exceeding 2.5MHz violates timing specifications and may cause communication failures or incorrect register writes.